#extraction

Coffee brewing maths as an API, computed locally and deterministically. The ratio endpoint works out a brew recipe from any two of the coffee dose, the water and the brew ratio — water = coffee × ratio — and reports the third value, the ratio as 1:N, the number of cups and whether the recipe sits around the SCA "golden ratio" of about 1:16–1:17. The espresso endpoint does the same for espresso from any two of the dose, the yield and the brew ratio (yield = dose × brew ratio), labelling the shot ristretto, normale or lungo. The extraction endpoint computes the extraction yield, EY% = (beverage mass × TDS%) ÷ dose, from the dose, the brewed beverage mass (or the water, estimating the mass the grounds retain) and the measured total dissolved solids, then classifies the brew as under-extracted, ideal or over-extracted and weak through very strong against the SCA brewing control chart. Masses are in grams, water in grams or millilitres. Everything is computed locally and deterministically, so it is instant and private. Ideal for specialty-coffee, café, brewing-scale and recipe app developers, pour-over and espresso tools, and barista training. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is coffee brewing maths; for cooking-unit conversions use a cooking API and for caffeine intake use a caffeine API.

api.oanor.com/coffee-api

Extract text from images with optical character recognition in eight languages (English, German, French, Spanish, Italian, Portuguese, Dutch and Turkish). Get the full recognised text with an average confidence score and word and line counts, or word-level results where every word carries its own confidence and bounding box for layout-aware processing. Supply an image by public URL, base64 or a raw binary request body; large images are downscaled automatically before recognition to keep responses fast, and a warm engine keeps latency low after start-up. Pure server-side computation (Tesseract, no third-party upstream, no per-call cloud cost). Ideal for digitising documents and receipts, reading text from photos and screenshots, accessibility, and data-entry automation.

api.oanor.com/ocr-api