Real-time BSL and ASL Translation for Live Events, Streaming & Broadcast
Your real-time AI translator for BSL and ASL, turning text into sign language video using cutting-edge AI.
Deaf people in the UK use BSL as their primary language
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Now Live: SignStream Dev
Create your first stream. Manage your API keys.
Introducing SignStream Chat
Type a message. Watch it come to life.
Instant British Sign Language and American Sign Language:
Live, Embedded, Scalable
The SignStream API delivers real-time British Sign Language (BSL) and American Sign Language (ASL) videos from short English phrases, powered by our Digital Signers. It’s lightweight, easy to integrate, and ready to make your live experiences more accessible.
Whether it’s a conference screen, a digital billboard, a live stream, or an internal system, SignStream brings spontaneous inclusivity to your platform.
What is SignStream?
SignStream is a fast, AI-powered sign language translation tool built for accessibility and innovation. It instantly converts text or speech into a sign language video.
Where It Works Best:
• Event screens and stage backdrops
• Digital signage in transport or retail
• Live broadcast overlays
• Internal tools and rapid prototypes
• Chatbots & accessibility widgets
There’s no human review or grammar editing; It's a real-time sign language translator designed to get you moving.
Explore SignStream
SignStream Chat
SignStream Chat is our new messaging translator, built for real-time text-to-sign language translation. Simply type your message into the chat and get a sign language video in return.
No scripts. No scheduling. No waiting.
Text to Sign Language, Made Simple
Choose between BSL and ASL, and personalise your translation with a range of Digital Signers. Whether you’re translating a single sentence or a full conversation, SignStream Chat makes translating into sign language effortless.
Free to Try, Built to Scale
At Signapse, we believe accessibility tools should be available to everyone. That’s why every user gets 60 seconds of free sign language translation each week. This is more than enough time to translate multiple sentences and explore our range of Digital Signers.
Share Beyond the Chat
Your translations don’t have to stay in the chat. Download them in multiple formats and share them across social media, presentations or anywhere your audience needs them.
Quick Sign Language Translation
The messenger-style translator offers a easy-to-use translation, straight in chat.
German Sign Language Coming Soon
Our German Sign Language (DGS) option is in development and scheduled for launch in Q4 2026.
Dedicated Mobile Option
We have created a mobile option made for on-the-go signing when you need it most.
Built with Feedback in Mind
You can help shape the tool as it grows through star ratings, feedback forms and video feedback.
1. Log In or Create an Account
Log into your SignStream account.
(If you already have a SignStudio account, you will need to create a dedicated SignStream account!).
2. Select SignStream Chat
Open the SignStream Chat tab to access our message-style translator.
3. Create a Chat
Simply type the message you want to translate into the message box.
4. Start Translation
Click send and watch as your chosen Digital Signer translates your message into sign language.
5. Customise Your Video
Choose from our range of sign languages and Digital Signers for a video customised to your needs.
6. Download and Share
Once you're happy, you can download and share your video on the platform you want!
SignStream Dev
SignStream Dev is available for organisations, developers and technical teams to integrate real-time sign language translation directly into live streaming platforms.
Real-time. On demand. Scalable.
Create and Manage API Keys
Generate your own API keys through our dedicated Developer Portal. You can customise expiration dates, rotate or revoke them too.
Build Streams
Create a stream personalised to your protocol, sign language and Digital Signer preference.
Compatible with Multiple Stream Types
SignStream Dev supports RTMP (Real-Time Messaging Protocol), SRT (Secure Reliable Transport) and HLS.
Only Pay For What You Use
You can start a stream with a minimum of 10 credits and pay any extra spend later.
1 Minute of Free Set-Up Time
Your first API key or stream includes 1 free minute for set up and testing.
Seamless System Integration
Connects to existing products, services and workflows.
Scalable For Any Stream
Designed to support high-volume or continuous use cases.
1. Log In or Create an Account
Log into your SignStream account.
(If you already have a SignStudio account, you will need to create a dedicated SignStream account!).
2. Select SignStream Dev
Open the SignStream Dev tab and click "Streaming" to create your first stream.
3. Name Your Stream
Fill out basic details for your stream including a Name, Protocol and Active Window.
4. Select a Language
Choose your sign language and Digital Signer.
5. Create Your Stream
When you’re ready, select “Create a stream”.
6. Go Live
From a Server URL, Stream Key, and Signed Output, you’ll see everything you need to start streaming.
Ready to Make Your Content Accessible?
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Watch SignStream In Action
How does it work?
01
Plug in the API
Adds our lightweight SignStream API to your system or platform.
02
Send the text
Push your text content to the API endpoint
03
Get back a video
The API responds with a high-quality video file of one of our Digital Signers signing your message.
04
Play it
The signed video slots right into existing screens, signage displays, broadcast platforms, and more.
FAQs
No, and that’s important. The API is entirely AI-generated, with no human grammar checking or quality assurance. The output may include grammatical inaccuracies from a BSL or ASL perspective, so it is not suitable for formal, legal, or official use. It’s best for casual messaging or testing new accessibility concepts.
For a more formal version of our AI sign language translation technology, why not take a look at SignStudio?The API is designed to be developer-friendly and lightweight. You can integrate it with just a few lines of code. We provide clear documentation, example requests, and support if needed.
Yes! We have launched SignStream Chat which offers you 60 seconds of free sign language translation so you can try our AI technology before you commit. Simply type in your message and receive a sign language video in BSL or ASL with your chosen Digital Signer. Try SignStream Chat now.
Currently, the SignStream API supports British Sign Language (BSL) and American Sign Language (ASL). We are currently working on German Sign Language (DGS), so stay tuned!
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