Polylog — Live Speech Translation
YEAR
2026
MY ROLE
Design and development; browser client and protocol published
INDUSTRY
Live events
STACK USED
- Python
- WebSocket
- JavaScript
- AudioWorklet
- Docker
- Caddy
Project Overview
Polylog turns a speaker's voice into live subtitles in other languages. Attendees open a link on their own phones and read along in their language a few seconds after the words are spoken.
I built the platform. The service itself is private; the browser client, the microphone capture and the WebSocket protocol are open source, with a mock server that replays a conference session so anyone can try the client without a backend.
Key Features
Subtitles that stream
Each subtitle grows as the translation streams in, instead of appearing only when a sentence ends.
Listeners can switch language mid-sentence without reconnecting.
Audio that doesn't stutter
Microphone capture runs on the browser's audio thread, so page rendering can't cause dropouts.
A documented protocol
Message shapes, the error contract, echo suppression and the latency budget are written down in the repository.
Project Gallery
Challenges Solved
Paying for sessions nobody is using
Translation is billed while a session runs. The service ends sessions that are abandoned, silent or running too long, so a forgotten event can't keep incurring costs.
Retrying what can't succeed
Every server error says whether a retry can help. The client backs off and reconnects when the event hasn't started yet, and stops on a bad link or an unsupported language instead of retrying forever.
People in the room hearing double
Someone sitting in the room doesn't need a translation of the language being spoken — they can hear it. Echo suppression is decided by the language detected in the speech, not a speaker's profile, because speakers switch language mid-talk.
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