# About

> What signLingo is, how the camera grades a handshape without a trained model, and what it deliberately cannot do.

signLingo teaches the fingerspelling alphabets and starter vocabulary of 10 sign languages — American Sign Language (ASL), British Sign Language (BSL), French Sign Language (LSF), Indian Sign Language (ISL), Chinese Sign Language (CSL), Australian Sign Language (Auslan), Brazilian Sign Language (Libras), German Sign Language (DGS), Japanese Sign Language (JSL), Spanish Sign Language (LSE) — across 276 lessons covering 237 signs. It is free, needs no account, and runs in a browser tab.

## How the checking works

Every sign is written down in full before it is ever taught: which fingers are curled, which are extended, how the hand is turned, and where it sits relative to your shoulders and eyes. When you make the shape, each of those parts is checked on its own.

That is why the feedback can name a finger instead of quietly lowering a score you cannot interpret. It is also why signLingo can teach a language that no app has a pile of training footage for, and why it keeps working with the internet off.

## What it does not do

signLingo grades handshape, orientation and placement. It does not read your face, so the eyebrow and mouth grammar that carries real meaning in every sign language is invisible to it. It is not a translator. And a fingerspelling alphabet plus a few dozen signs is a doorway into a language, not the language itself — the app says so on the page rather than in the small print.

The people who own these languages are Deaf communities. signLingo is built to get somebody to the point of a first conversation, and then out of the way. It is not a substitute for a Deaf teacher.

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