API Marketplace

Acoustics and decibel maths as an API. The decibel endpoint converts between a linear ratio and decibels, in either the power convention (10·log₁₀) or the amplitude/pressure convention (20·log₁₀), in both directions. The combine endpoint adds sound levels the way real (incoherent) sources combine — by energy summation, so two equal 80 dB sources give 83 dB, not 160 — and can also subtract a known source from a measured total. The distance endpoint applies the inverse-square law to a point source in a free field (−6 dB per doubling of distance) to find the level at a new distance. The wavelength endpoint converts between frequency and wavelength for sound, deriving the speed of sound from the air temperature (or a value you provide). Everything is computed locally and deterministically, so it is instant and private. Ideal for audio engineering and live sound, room and architectural acoustics, noise assessment and environmental monitoring, and physics teaching. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 5 endpoints. This is acoustics maths; for electrical circuits use an Ohm's-law API and for general unit conversion use a unit API.

Tempo di attività

100.0%

Latenza

72ms

Abbonati

3,860

API de matemáticas enteras a nivel de bits, con anchos de 8, 16, 32 o 64 bits y aritmética exacta de enteros grandes. El endpoint inspect toma un número (decimal, hexadecimal 0x, binario 0b u octal 0o) y devuelve sus formas decimal, con signo (complemento a dos), hexadecimal, binaria y octal, además del conteo de población (peso de Hamming), paridad, conteo de ceros iniciales y finales, si es una potencia de dos, su valor invertido en bits y su valor intercambiado de bytes (endianness). El endpoint ops realiza una operación bitwise — AND, OR, XOR, NAND, NOR, XNOR, NOT, desplazamientos lógicos y aritméticos (shl, shr, sar) y rotaciones (rol, ror) — enmascarada al ancho elegido. El endpoint bit establece, limpia, alterna o prueba un bit individual por índice. Todo se calcula local y determinísticamente, por lo que es instantáneo y privado. Ideal para programación embebida y de sistemas, manejo de protocolos de red y banderas, gráficos y hashing, emuladores e ingeniería inversa, y enseñanza de binario. Cálculo local puro — sin clave, sin servicio de terceros, instantáneo. En vivo, nada se almacena. 4 endpoints. Esto es manipulación de bits; para conversión de base 2-36 use una API de conversión de bases y para bits de punto flotante IEEE-754 use una API de punto flotante.

Tempo di attività

100.0%

Latenza

87ms

Abbonati

3,665

Matemática de gravidez e data de parto como uma API, usando a regra padrão de Naegele (40 semanas / 280 dias a partir do último período menstrual). O endpoint de data de parto recebe o último período menstrual, a data de concepção ou uma data de parto conhecida — o que você tiver — e retorna a data de parto, a data estimada de concepção e a janela fértil. O endpoint de idade gestacional informa o progresso da gravidez em qualquer data de referência: idade gestacional em semanas e dias, o trimestre, dias restantes, porcentagem de progresso e se está atrasada. O endpoint de marcos lista as datas-chave de uma gravidez — os limites dos trimestres, a janela de ultrassom anatômico, viabilidade às 24 semanas, termo completo às 37–40 semanas, a data de parto e pós-termo às 42 semanas. Todas as datas são tratadas em UTC e calculadas localmente e deterministicamente. Ideal para aplicativos de gravidez e fertilidade, ferramentas de obstetrícia e clínicas, e produtos de parentalidade e planejamento familiar. Apenas informativo — não é aconselhamento médico. Cálculo local puro — sem chave, sem serviço de terceiros, instantâneo. Ao vivo, nada armazenado. 4 endpoints. Isso é matemática de datas de gravidez; para aritmética geral de datas, use uma API de data e hora.

Tempo di attività

100.0%

Latenza

73ms

Abbonati

3,484

CIE colour science as an API: convert colours through the device-independent spaces and measure how different two colours really look. The convert endpoint takes a colour as hex, RGB or CIELAB and returns it in sRGB hex, RGB, CIE XYZ and CIELAB (D65 white point). The distance endpoint computes the perceptual difference between two colours with all three standard Delta-E formulas — CIE76 (plain Lab distance), CIE94, and CIEDE2000, the modern and most accurate metric — and tells you whether the difference is perceptible. The nearest endpoint finds the closest named colour to any colour by CIEDE2000. This is the maths behind colour matching, print and brand-colour QC, and tolerancing — distinct from simple hex/RGB/HSL conversion. Everything is computed locally and deterministically, so it is instant and private. Ideal for print and prepress, brand-colour compliance, textile and paint matching, image processing and computer vision, and design tooling. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. This is CIE colour difference; for hex/RGB/HSL/CMYK conversion, palettes and WCAG contrast use a colour API.

Tempo di attività

100.0%

Latenza

79ms

Abbonati

3,499

Meteorological formulas as an API — the derived weather figures, computed from your own readings, with no data feed or key needed. The wind-chill endpoint gives the "feels like" cold using the Environment Canada formula in metric (°C, km/h) or the US NWS formula in imperial (°F, mph), and flags when the reading is outside the valid range. The heat-index endpoint gives the apparent temperature from heat and humidity using the NWS Rothfusz regression with the standard low- and high-humidity adjustments. The dew-point endpoint uses the Magnus formula to turn temperature and relative humidity into the dew point, and also returns the vapour pressure and the absolute humidity. The beaufort endpoint maps a wind speed (m/s, km/h, mph or knots) to its Beaufort force and description, or a force back to its speed range. Everything is computed locally and deterministically, so it is instant and private. Ideal for weather apps and dashboards, agriculture and HVAC, marine and aviation, and outdoor and safety tools. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 5 endpoints. This computes weather formulas from your own readings; for live forecasts and observations use a weather data API.

Tempo di attività

100.0%

Latenza

73ms

Abbonati

4,194

Matemáticas de teoría musical como API, en temperamento igual con A4 = 440 Hz y notación de tono científica (C4 = Do central = MIDI 60). El endpoint de notas convierte libremente entre un nombre de nota (A4, C#5, Eb3), un número de nota MIDI y una frecuencia — y cuando pasas una frecuencia, devuelve la nota más cercana y cuántos cents está desafinada. El endpoint de intervalos da la distancia entre dos notas en semitonos y cents, su nombre (quinta perfecta, tercera mayor, …) y la relación de frecuencia exacta. El endpoint de acordes devuelve las notas, números MIDI y frecuencias de un acorde a partir de una nota fundamental y una calidad (mayor, menor, disminuido, aumentado, suspendido, 6, 7, maj7, m7, dim7, m7b5, 9 y más). El endpoint de escalas devuelve las notas de una escala o modo a partir de una fundamental — mayor, las tres escalas menores, los siete modos eclesiásticos, las pentatónicas mayor y menor, blues, tono completo y cromática. La ortografía con sostenidos o bemoles es seleccionable. Todo se calcula local y determinísticamente, por lo que es instantáneo y privado. Ideal para aplicaciones y juegos musicales, sintetizadores y DAWs, entrenamiento auditivo y enseñanza de teoría, afinadores y herramientas MIDI. Cálculo local puro — sin clave, sin servicio de terceros, instantáneo. En vivo, nada se almacena. 5 endpoints. Esto es teoría musical; para buscar pistas y artistas usa una API de música y para el repertorio clásico usa una API de música clásica.

Tempo di attività

100.0%

Latenza

72ms

Abbonati

3,938

Matemática de circuitos eletrônicos como uma API. O endpoint ohms-law recebe quaisquer dois dos parâmetros tensão, corrente, resistência e potência e retorna todos os quatro (V = IR, P = VI = I²R = V²/R). O endpoint combine calcula o total de resistores, capacitores ou indutores ligados em série ou paralelo — resistores e indutores somam em série e combinam-se reciprocamente em paralelo, enquanto capacitores fazem o oposto. O endpoint voltage-divider calcula a tensão de saída de um divisor de dois resistores e a corrente através dele. O endpoint reactance calcula a reatância capacitiva (Xc = 1/2πfC), a reatância indutiva (XL = 2πfL), a frequência de ressonância LC e a constante de tempo RC ou RL. Tudo é calculado localmente com fórmulas exatas em unidades SI, portanto é instantâneo e privado. Ideal para design e educação em eletrônica, engenharia embarcada e de hardware, projetos de hobby e bancada, e ensino de física. Cálculo local puro — sem chave, sem serviço de terceiros, instantâneo. Ao vivo, nada armazenado. 5 endpoints. Isto é matemática de circuitos; para códigos de cores de resistores use uma API de resistores e para conversão geral de unidades use uma API de unidades.

Tempo di attività

100.0%

Latenza

76ms

Abbonati

4,043

Resolution, print-size and pixel-density maths for print, design, photography and screens. The resolve endpoint takes any two of pixels, DPI and physical length and computes the third, returning the size in inches, centimetres, millimetres and points — so you can answer "how big will a 3000-pixel image print at 300 DPI" or "what DPI do I get printing 3000 px at 10 inches". The ppi endpoint computes a screen's pixel density from its resolution and diagonal size, plus the dot pitch in millimetres, the total megapixels and the aspect ratio. The convert endpoint converts a length between pixels, inches, centimetres, millimetres and points (PostScript points, 1/72 inch), using a DPI when pixels are involved. Everything is computed locally and deterministically, so it is instant and private. Ideal for print and prepress, graphic and web design, photography, and screen and display specs. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. This is DPI and print-size maths; for aspect ratios and resizing use an aspect-ratio API and for general unit conversion use a unit API.

Tempo di attività

100.0%

Latenza

76ms

Abbonati

3,639

Re-mapeia texto entre layouts de teclado — a correção para texto digitado com o teclado configurado no layout errado. O endpoint remap recebe texto, um layout de origem e um layout de destino, e reescreve cada caractere para aquele produzido pela mesma tecla física no outro layout. Assim, texto digitado acidentalmente em um teclado configurado para Dvorak enquanto você queria QWERTY (ou o inverso) é recuperado exatamente, e como o mapeamento preserva a posição, ele faz ida e volta perfeitamente. Suporta QWERTY (US), Dvorak e Colemak, incluindo os símbolos shiftados, e deixa caracteres que não estão em uma tecla remapeável (espaços e acentos) intocados. O endpoint layouts retorna o mapa completo de teclas para cada layout. Tudo é computado localmente e deterministicamente, então é instantâneo e privado. Ideal para corrigir digitação no layout errado, construir editores de texto e ferramentas IME, auxílios de aprendizado de layout e pesquisa entre layouts. Computação local pura — sem chave, sem serviço de terceiros, instantâneo. Ao vivo, nada armazenado. 3 endpoints. Isso remapeia entre layouts de teclado; para cifras clássicas (César, ROT13, Morse) use uma API de cifra.

Tempo di attività

100.0%

Latenza

81ms

Abbonati

4,338

Convert integers and numbers into the special number representations that ordinary base conversion leaves out — and back again. The graycode endpoint converts between an integer and its reflected binary Gray code, where consecutive values differ by exactly one bit (used in rotary encoders, Karnaugh maps and error reduction). The balanced-ternary endpoint converts between an integer and balanced ternary, the base-3 system with digits −1, 0 and +1 (written T, 0, 1) that needs no separate sign. The factoradic endpoint converts between an integer and the factorial number system (mixed radix 1, 2, 3, …), the basis of permutation ranking and Lehmer codes. The continued-fraction endpoint turns a fraction or a real number into its continued-fraction expansion [a0; a1, a2, …] and lists the convergents — the successively best rational approximations — and can rebuild the value from the terms. All integer maths is exact via big integers. Everything is computed locally and deterministically, so it is instant and private. Ideal for computer-science teaching, combinatorics and permutation ranking, error-correcting and encoder design, rational approximation, and recreational mathematics. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 5 endpoints. This handles special number representations; for ordinary base 2-36 conversion use a base-convert API.

Tempo di attività

100.0%

Latenza

74ms

Abbonati

3,396

Expande plantillas URI (RFC 6570) — el estándar utilizado por GitHub, OpenAPI/Swagger, HAL y muchas APIs hipermedia — para construir URLs a partir de una plantilla y un conjunto de variables. El endpoint expand toma una plantilla como /users/{user}{?page,per_page} y un objeto JSON de variables, y devuelve la URI final con todo correctamente codificado en porcentaje. Implementa los cuatro niveles de la especificación: expansión simple {var}; expansión reservada {+var} y de fragmento {#var}; los operadores de etiqueta {.var}, ruta {/var}, parámetro de estilo de ruta {;var}, consulta {?var} y continuación de consulta {&var}; múltiples variables {x,y}; y los modificadores de valor — prefijo {var:3} (primeros N caracteres) y explosión {var*} (expande listas y mapas elemento por elemento). Las variables pueden ser cadenas, listas o mapas asociativos. El endpoint parse inspecciona una plantilla y enumera sus expresiones, operadores y nombres de variables. Todo se calcula local y determinísticamente, por lo que es instantáneo y privado. Ideal para clientes REST e hipermedia, SDKs de API y generadores de código, herramientas OpenAPI y construcción de enlaces. Cálculo puramente local — sin clave, sin servicio de terceros, instantáneo. En vivo, nada almacenado. 3 endpoints. Esto expande plantillas URI; para construir o analizar cadenas de consulta use una API de cadenas de consulta y para canonizar URLs use una API de URL.

Tempo di attività

100.0%

Latenza

81ms

Abbonati

3,084

Non-cryptographic hash functions — the fast hashes used in hash tables, bloom filters, sharding, deduplication and cache keys. Give it text (UTF-8) or raw bytes as hex and it returns the digest under every algorithm at once, or under one named algorithm: FNV-1 and FNV-1a (32- and 64-bit), djb2, sdbm, Jenkins one-at-a-time, CRC-16 (CCITT-FALSE and ARC/IBM), Fletcher-16 and Fletcher-32, and MurmurHash3 (x86 32-bit, with an optional seed). Each digest is returned in hex and as an unsigned integer. Everything is computed locally and deterministically, so the same input always maps to the same hash — exactly what you need for stable bucketing and lookups. These are deliberately NOT for security: they are fast and well-distributed, not collision-resistant. Ideal for hash-table and bloom-filter implementations, consistent sharding and partitioning, cache and dedup keys, A/B bucketing, and teaching how hashing works. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. For cryptographic hashes (SHA, MD5, HMAC) use a hash API, and for CRC-32/Adler-32 integrity checksums use a checksum API.

Tempo di attività

100.0%

Latenza

82ms

Abbonati

3,193

Work with polynomials: find their roots, evaluate them, differentiate and integrate, and add, subtract, multiply or divide them. The roots endpoint returns every root — real and complex — using the exact quadratic formula for degree 2 and the Durand-Kerner method for higher degrees, with a clean list of just the real roots too. The evaluate endpoint computes p(x) and p'(x) at a point by Horner's method. The derivative endpoint returns the coefficients of the derivative and of the indefinite integral. The operate endpoint does polynomial arithmetic — addition, subtraction, multiplication, and long division giving a quotient and a remainder. Coefficients are given highest-degree first, so [1,-3,2] means x² − 3x + 2. Everything is computed locally and deterministically, so it is instant and private. Ideal for engineering and control systems, signal processing and filter design, computer graphics and curve fitting, scientific computing, and teaching algebra and calculus. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 5 endpoints. This is polynomial maths; for matrices and linear systems use a matrix API, for vectors a vector API, and for general arithmetic a math API.

Tempo di attività

100.0%

Latenza

72ms

Abbonati

3,128

Linear algebra as an API: multiply matrices, analyse a matrix, and solve linear systems — all computed locally and exactly. The multiply endpoint returns the product A×B, checking that the inner dimensions match. The analyze endpoint takes any matrix and returns its transpose and rank, and for square matrices also the determinant, trace, whether it is symmetric and invertible, and the inverse when it exists — using LU decomposition with partial pivoting and Gauss-Jordan elimination for numerical stability. The solve endpoint solves a system Ax = b for a square coefficient matrix by Gaussian elimination with partial pivoting, and reports cleanly when the matrix is singular and there is no unique solution. Matrices are passed as JSON arrays of rows, for example [[1,2],[3,4]]. Everything is deterministic and instant. Ideal for data-science and machine-learning prep, computer graphics and 3D transforms, engineering and physics, computer-vision calibration, control systems, and teaching linear algebra. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. This is matrix and linear-algebra maths; for 3D rotations use a quaternion API, for vector maths use a vector API, and for statistics use a stats API.

Tempo di attività

100.0%

Latenza

76ms

Abbonati

3,154

3D rotation maths as an API: convert freely between quaternions, Euler angles, axis-angle and rotation matrices, compose rotations, rotate vectors, and interpolate. The convert endpoint takes any one representation — a quaternion {w,x,y,z}, Euler angles (roll, pitch, yaw), an axis and angle, or a 3×3 matrix — and returns all four forms at once, normalized. The multiply endpoint composes two quaternions (the Hamilton product) so you can chain rotations. The rotate endpoint applies a quaternion to a 3D vector. The slerp endpoint does spherical linear interpolation between two orientations along the shortest path — the standard way to animate smooth rotations. Euler angles use the aerospace Z-Y-X (yaw-pitch-roll) intrinsic convention in degrees; quaternions follow the Hamilton convention with order w,x,y,z; matrices are row-major right-handed. Everything is computed locally and deterministically, so it is instant and private. Ideal for game and graphics engines, robotics and drones, IMU and sensor fusion, aerospace and flight dynamics, VR/AR, and 3D content tooling. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 5 endpoints. This is 3D rotation maths; for 2D geometry use a geometry API and for plain angle-unit conversion use an angle API.

Tempo di attività

100.0%

Latenza

76ms

Abbonati

3,042

Read and write resistor colour codes and snap values to the standard E-series. The decode endpoint takes the colour bands of a 3-, 4-, 5- or 6-band resistor and returns the resistance in ohms (nicely formatted as Ω/kΩ/MΩ/GΩ), the significant digits and multiplier, the tolerance, the minimum and maximum resistance that tolerance implies, and — for 6-band parts — the temperature coefficient in ppm/K. The encode endpoint goes the other way: give it a resistance in ohms (and optionally a band count and tolerance) and it returns the colour bands, picking the nearest value representable with the available significant digits. The eseries endpoint snaps any value to the nearest preferred resistor value in the E6, E12, E24, E48 or E96 series and reports the percentage error and the neighbouring preferred values. It uses the standard IEC 60062 colour assignments (including gold ×0.1 and silver ×0.01 multipliers and the implicit ±20% of a 3-band part). Everything is computed locally and deterministically, so it is instant and private. Ideal for electronics design, PCB and BOM work, lab and hobby bench use, repair and reverse-engineering, and teaching. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. This is for resistor colour codes; for general number formatting use a number-format API.

Tempo di attività

100.0%

Latenza

76ms

Abbonati

4,743

Evaluate boolean-logic expressions and generate complete truth tables. The table endpoint takes a boolean expression, finds its variables, builds every row of the truth table (the first variable is the most-significant bit, the standard convention), and returns each row's values and result, the list of minterms (the row indices where the expression is true), a classification of tautology / contradiction / contingency, and a canonical sum-of-products (SOP) form. The evaluate endpoint computes the expression's value for one specific assignment of its variables. It understands the full set of operators in both symbol and word form — NOT (!, ~, ¬), AND (&, &&, ∧, *, ., AND), OR (|, ||, ∨, +, OR), XOR (^, ⊕), NAND, NOR, XNOR, implication (->, =>, →, IMPLIES) and the biconditional (<->, <=>, ↔, IFF) — with the usual precedence (NOT > AND > XOR > OR > IMPLIES > IFF), parentheses, and the constants 0/1 and true/false. Everything is computed locally and deterministically, so it is instant and private. Ideal for digital-logic and discrete-math teaching, hardware and HDL design, simplifying conditions in code, SAT-style sanity checks, and interview prep. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This evaluates boolean logic and builds truth tables; for arithmetic and equations use a math API.

Tempo di attività

100.0%

Latenza

76ms

Abbonati

3,803

Encode and decode CBOR (RFC 8949, Concise Binary Object Representation) — the IETF-standard binary data format behind COSE, WebAuthn/FIDO2, the EU Digital COVID Certificate, and many IoT and constrained-device protocols. The encode endpoint turns a JSON value into compact, definite-length CBOR, choosing the smallest head for each integer, string, array and map; the decode endpoint parses CBOR back into a JSON value. It implements the spec across all major types — unsigned and negative integers of every width, byte and text strings (including indefinite-length chunked strings), arrays, maps, tags, the simple values false/true/null, and half-, single- and double-precision floats — and rejects trailing or truncated data rather than silently mangling it. Byte strings and any non-UTF-8 text come back losslessly as {"_bytes_hex":"…"}, tags as {"_tag":{"tag":N,"value":…}}, non-finite floats as {"_float":"NaN|Infinity|-Infinity"}, and other simple values as {"_simple":N}, so encode and decode round-trip exactly. Bytes are exchanged as both hex and base64 so they survive any transport. Everything is computed locally and deterministically, so it is instant and private. Ideal for debugging CBOR, COSE and WebAuthn payloads, bridging JSON and CBOR systems, IoT and smart-card pipelines, and teaching the format. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is CBOR specifically; for MessagePack use the MessagePack API, for BitTorrent's Bencode use the Bencode API, for JSON, YAML, TOML or XML use those format APIs, and for base64, hex, URL or HTML encoding use a general encoding API.

Tempo di attività

100.0%

Latenza

79ms

Abbonati

4,335

Codifica e decodifica MessagePack — il formato di serializzazione binaria compatto ("è come JSON, ma veloce e piccolo") utilizzato da Redis, Fluentd, molti sistemi RPC e protocolli IoT. L'endpoint di codifica trasforma un valore JSON in byte MessagePack, scegliendo automaticamente la rappresentazione più piccola per ogni intero, stringa, array e mappa; l'endpoint di decodifica analizza MessagePack restituendo un valore JSON. Implementa l'intera specifica — nil, booleani, ogni larghezza di intero fissa e variabile, float32 e float64, str e bin, array e mappe, e la famiglia ext — e rifiuta dati troncati o finali invece di modificarli silenziosamente. I valori binari (bin) e qualsiasi stringa non UTF-8 vengono restituiti senza perdita come oggetto {"_bytes_hex":"…"}, e i valori ext come {"_ext":{"type":N,"hex":"…"}}, quindi codifica e decodifica sono esatti. I byte vengono scambiati sia in esadecimale che in base64 per sopravvivere a qualsiasi trasporto. Tutto viene calcolato localmente e deterministicamente, quindi è istantaneo e privato. Ideale per il debug di payload MessagePack, per collegare sistemi JSON e msgpack, per strumenti RPC e cache, pipeline IoT e per insegnare il formato. Puro calcolo locale — nessuna chiave, nessun servizio di terze parti, istantaneo. Live, nulla viene memorizzato. 3 endpoint. Questo è specificamente MessagePack; per JSON, YAML, TOML o XML usa quelle API di formato, per Bencode di BitTorrent usa l'API Bencode, e per codifica base64, esadecimale, URL o HTML usa un'API di codifica generale.

Tempo di attività

100.0%

Latenza

80ms

Abbonati

3,183

Codifica e decodifica Bencode (BEP 3) — il formato di serializzazione che BitTorrent usa per i file .torrent metainfo e le risposte dei tracker. L'endpoint encode trasforma un valore JSON in Bencode: gli oggetti diventano dizionari con le loro chiavi ordinate in ordine di byte grezzo esattamente come richiesto dalla specifica, gli array diventano liste, i numeri interi diventano interi e le stringhe diventano stringhe di byte con prefisso di lunghezza. L'endpoint decode analizza Bencode in un valore JSON e applica rigorosamente la specifica — nessuno zero iniziale negli interi, nessuno zero negativo, le chiavi del dizionario devono essere ordinate e uniche, e nessun dato finale è tollerato — quindi input malformati vengono rifiutati anziché modificati silenziosamente. Le stringhe di byte binarie che non sono UTF-8 valide sono rappresentate senza perdita come un oggetto {"_bytes_hex":"…"}, quindi encode e decode fanno un round-trip esatto anche per il campo binario "pieces" di un torrent reale. Decode accetta i dati sia come testo che, per payload genuinamente binari, come esadecimale; encode restituisce sia il testo Bencode (quando stampabile) che i suoi byte esadecimali. Tutto è calcolato localmente e deterministicamente, quindi è istantaneo e privato. Ideale per creare e analizzare file .torrent, strumenti per tracker, client BitTorrent e messaggi DHT, e per insegnare come funziona il formato. Pura computazione locale — nessuna chiave, nessun servizio di terze parti, istantaneo. Live, nulla viene memorizzato. 3 endpoint. Questo è specificamente il Bencode di BitTorrent; per codifica base64, esadecimale, URL o HTML usa un'API di codifica generale, e per JSON, YAML, TOML o XML usa quelle API di formato.

Tempo di attività

100.0%

Latenza

78ms

Abbonati

4,713

Encode and decode Base45 (RFC 9285) — the compact binary-to-text encoding designed to pack densely into the alphanumeric mode of QR codes, best known as the carrier for the EU Digital COVID Certificate. The encode endpoint turns text (UTF-8) or raw bytes given as hex into a Base45 string; the decode endpoint turns a Base45 string back into bytes, returned as hex and — when the bytes are valid UTF-8 — as text. It uses the official 45-character alphabet (0-9, A-Z and a handful of symbols), packs two bytes into three characters (or one byte into two), and validates length and value ranges strictly so malformed input is rejected rather than silently mangled. Everything is computed locally and deterministically, so it is instant and private. Ideal for QR-code payloads, digital health and travel certificates, alphanumeric-mode encoders, and any binary data that must survive an uppercase-only channel. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is Base45 specifically; for base64, base32, hex, URL or HTML entity encoding use a general encoding API.

Tempo di attività

100.0%

Latenza

80ms

Abbonati

3,079

电子邮件和MIME文本编码，这是一般base64/hex工具包所遗漏的。quoted-printable端点编码和解码Quoted-Printable（RFC 2045）——这种Content-Transfer-Encoding在保持大部分ASCII文本可读的同时，将其他所有内容转义为=XX十六进制，并按照规范要求进行76列的软换行和尾部空格处理。encoded-word端点编码和解码RFC 2047编码词——即=?UTF-8?Q?…?=和=?UTF-8?B?…?=形式，用于在电子邮件主题、发件人、收件人等头部中携带非ASCII文本——支持Q（quoted-printable风格）或B（base64）变体，并将任意混合的编码词解码回纯文本。所有内容均为UTF-8，并在本地确定性地计算，因此即时且私密。非常适合构建和解析电子邮件（SMTP/IMAP）、.eml和MIME工具、新闻通讯和事务性邮件系统，以及迁移旧邮件数据。纯本地计算——无需密钥，无需第三方服务，即时。实时，不存储任何内容。3个端点。这些是MIME特定的编码；对于base64、base32、十六进制、URL和HTML实体编码，请使用通用编码API。

Tempo di attività

100.0%

Latenza

83ms

Abbonati

4,163

Work out tips and split a bill — with exact cent maths so the per-person amounts always add back up to the total, no penny ever lost to rounding. The calc endpoint takes a bill, a tip percentage (15% by default) and a number of people and returns the tip amount, the grand total, the per-person amount, the effective tip percentage, and — when you want a tidy number — an optional rounding of the total either up to the next whole unit or to the nearest. When the bill does not divide evenly it produces a fair share list where a few people pay one cent more, so the parts sum precisely. The split endpoint divides any amount, optionally adding a tip first, evenly among people and returns that exact per-person share list. Everything is computed in integer cents locally and deterministically, so it is instant, private and always balances. Currency-agnostic — the numbers work for any currency. Ideal for restaurant and POS apps, expense-sharing and group-payment tools, delivery and service apps, and everyday bill splitting. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This calculates tips and splits; for percentage maths in general use a percentage API and for invoicing margins use a margin API.

Tempo di attività

100.0%

Latenza

84ms

Abbonati

4,075

Inspect and build IEEE 754 floating-point numbers — see exactly how a number is stored in the bits. The encode endpoint takes a number and decomposes its single (32-bit) or double (64-bit) representation into the sign bit, the raw and unbiased exponent, the mantissa, the full binary layout split into sign / exponent / mantissa, the hexadecimal word, and a classification (normal, subnormal, zero, infinity or NaN); for single precision it also returns the actual value after rounding, so you can see floating-point error directly. The decode endpoint goes the other way — give it a hex word or a 32-/64-bit binary string and it returns the number it represents along with the same field breakdown. It accepts inf, -inf and nan, and lays bytes out big-endian. Everything is computed locally and deterministically, so it is instant and exact. Ideal for systems and embedded programming, teaching how floats work, debugging precision and rounding bugs, binary protocols and file formats, and interview prep. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This inspects floating-point bits; for integer base conversion use a base-convert API.

Tempo di attività

100.0%

Latenza

75ms

Abbonati

3,562