Real ASL grammar
Not word-for-word English. Sentences are reordered clause by clause, and WH-questions, yes/no questions, and negation are rendered where ASL puts them: on the brows, head, and gaze.
What it does
Real ASL, shown honestly
Type or speak English — a 3D avatar signs it with real ASL grammar. Everything outside our sign library is fingerspelled, letter by letter, and always marked. Here's exactly what that means.
Capabilities
What SimuSign actually does
No inflated claims. Here is the real capability today — and every number on this page is documented on our honest limits page.
Honest fingerspelling
Any word outside our sign library is fingerspelled A–Z with real letter-to-letter transitions, and the camera eases in so you can read it. We never pass a spelled word off as a sign — or silently drop it.
Live voice streaming
Speak continuously — each sentence is translated and queued as you talk, signing in order without cutting the previous one off. Works with your microphone or any browser tab's audio.
Provenance you can see
Every translation is tagged under the hood with how it was produced — exact phrase match, rule-based draft, or fingerspelling — and we're bringing those tags into the studio as visible per-word chips. We show our work instead of hiding it.
A hand-authored avatar
Every sign in our library is individually authored and regression-tested — handshape, movement, and facial channels each verified. Quality over inflated sign counts.
Floating signer (beta)
Pop the avatar out into a small always-on-top window and pin it next to a video call, lecture, or anything else on your screen.
Where it shines
What we're great for
The use cases where SimuSign provides real value today — each one honest about its edges.
ASL learning and grammar study
Type any sentence and see how ASL actually structures it — reordered clauses, question and negation markers on the face. The grammar demonstrator no textbook or fixed video library can be.
ASL students, families, interpreter traineesFingerspelling practice
Receptive fingerspelling is famously the first skill learned and the last mastered. Watch any word — including names — spelled with real letter-to-letter transitions and an automatic close-up camera. Adjustable-speed drills are coming with our Trainer.
ASL students, interpreter training programsEveryday typed messages
Type a quick message and let the avatar sign it — a casual communication aid for mixed hearing/deaf households and friends. For casual moments only, never critical ones.
Families with deaf members, friends, colleaguesAccess preview: live voice and meetings
Stream your microphone or a meeting tab's audio and pin the floating signer beside it. Experimental and honestly labeled — vocabulary is limited today and gaps are fingerspelled, visibly.
Deaf & hard-of-hearing early adoptersVenue and organization content
Pre-authored, Deaf-reviewed signed content for counters, kiosks, and websites — the deployment pattern Deaf advocacy organizations endorse. We're selecting early design partners.
Venues, public services, websitesCurrent capabilities and limitations
SimuSign is a learning and communication aid — not an interpreter, and we will never market it as one.
Medical, legal, employment, and emergency communication require certified ASL interpreters, full stop. For everything we can and can't do today — including the exact size of our sign library and our public quality roadmap — see our honest limits page.
See it sign your words
Free during early access — type a sentence and watch real ASL grammar happen, honest fingerspelling included.