AI simultaneous interpretationConference and webinar participants hear in their native language
Like a prism breaks white light into a spectrum of colours, Prism takes a single conversation and delivers it simultaneously in every participant's language — no interpreter, no delay, from any browser.
One link. One invitation. Up to 30 languages translated simultaneously. Up to 500 participants.
Professional simultaneous translation: out of reach until now
A professional interpreter costs €300–600 per hour — per language. A 5-language event means €1,500–3,000 per hour, just for interpretation.
Booking interpreters takes weeks of advance planning. Organizing a spontaneous or reactive multilingual call or webinar is simply not possible.
RSI (Remote Simultaneous Interpretation) platforms still require human interpreters — AI doesn't replace the expensive part.
Google Meet and Zoom offer limited, non-real-time translation with no control over quality, available languages, or confidentiality.
Prism makes simultaneous translation accessible to any organization — no interpreter, no logistics, at a fraction of the cost.
Everything you need for a professional multilingual webinar
Four complementary modules to organize, host and broadcast a multilingual event from any browser.
Real-time simultaneous audio translation
The speaker talks in their language. Every participant hears the translation in theirs, with less than one second of delay. Natural voice quality — no robotic synthesis.
Sub-1-second delay
Translation latency under 1 second using our AI simultaneous translation engine — the most advanced available for real-time audio translation.
Up to 30 simultaneous languages
English, French, Spanish, German, Italian, Portuguese, Dutch, Chinese, Japanese, Arabic, Russian, Korean, Hindi, Turkish, Polish, Ukrainian and more — all active at once with no performance degradation. 70 languages available in the catalogue.
Natural voice
High-quality speech synthesis, natural tone adapted to the target language. No robotic voice, no excessive artificial accent.
100% browser-based
No installation, no plugin. Chrome, Firefox, Safari, Edge. iOS Safari and Android Chrome natively supported.
Full webinar mode
A clear role system for structured events: the host controls the room, co-hosts speak with video and audio, participants listen in their language.
Host
Presents, shares screen, manages speaking rights, grants or revokes participant speaking permissions with one click.
Co-host
Secondary speakers with camera, microphone and screen sharing unlocked. Ideal for panels, roundtables or multi-speaker training.
Participants
Join in listening mode, choose their language on entry, and can raise their hand to request speaking rights.
Floor control
Host grants or revokes speaking rights with one click from their control interface. Participants receive instant notifications.
Real-time communication tools
Chat, captions, raise hand and screen sharing — all the tools of a professional webinar, natively integrated in Prism.
Real-time chat
Instant messaging between all participants during the session. Messages are visible to everyone in their own interface.
Live captions
Subtitles generated in real time in each participant's chosen language, synchronized with the audio translation.
Raise hand
Participants signal their wish to speak with a single click. The host sees the queue and grants speaking rights in order.
Screen sharing
Available for host and co-hosts. Slide presentations, product demos, document sharing in real time.
Native mobile accessibility
Prism works on smartphones and tablets with no app to download. Participants join from their usual device, wherever they are in the world.
iOS Safari
Full support on iPhone and iPad. Silent audio loop keeps the AudioContext active even in the background.
Android Chrome
Wake Lock API prevents screen sleep during the session. Automatic reconnection on wake.
Responsive interface
Interface adapted to small screens: optimized touch controls, simplified portrait layout.
No download required
One link is enough. No app, no account required for participants. Joining takes under 10 seconds.
How it works
A cloud SFU architecture that separates media distribution from AI translation. Result: a minimal number of AI sessions serves hundreds of participants, regardless of audience size.
Speaks in their language, publishes a single audio stream via WebRTC
Receives the single audio stream and routes it to the translation agent
Parallel translation sessions running simultaneously — one per active language
Each participant receives the translated stream in their language in real time
Scalability built for large audiences
max participants in webinar mode
languages available in the catalogue
audio translation delay
languages active simultaneously in one session
| Mode | Participants | AI sessions |
|---|---|---|
| Open meeting (multi-speaker) | 10–15 | N × (K−1) |
| Webinar (1 active speaker) | 50–500 | K−1 only |
| Pure broadcast | Several hundred | K−1 only |
Pricing — No subscription or commitment required
Per-session billing. Pay only for what you use.
| Format | Participants | Languages | 30 min | 60 min |
|---|---|---|---|---|
| 1-language translation | ≤50 | 1 | €9 | €15 |
| Bilingual meeting | ≤15 | 2 | €12 | €19 |
| Multilingual meeting | ≤25 | ≤5 | €22 | €39 |
| Standard webinar | ≤50 | ≤5 | €35 | €59 |
| Large webinar | ≤200 | ≤8 | €55 | €99 |
| Event | ≤500 | ≤10 | €85 | €149 |
Subscriptions — Regular use
| Plan | Sessions | Languages | Participants | Prix |
|---|---|---|---|---|
| Starter | 5h | 2 | 20 | €49/month |
| Team | 20h | 5 | 50 | €149/month |
| Business | 60h | 10 | 200 | €399/month |
| Enterprise | Unlimited | 10+ | 500+ | Custom |
Prism vs the alternatives
| Solution | Cost | Limitations |
|---|---|---|
| Human interpreter | €300–600/h per language | Availability, booking lead times, logistics |
| RSI platforms | €200–1,000/event | Human interpreter still required |
| Zoom interpretation | €149/month | Human interpreter required, no AI |
| Google Meet | Limited translation | Not real-time, no control, closed platform |
| Prism | €9–149/session | AI, real-time, browser-based, no interpreter |
Roadmap
Available now
- ✓Real-time simultaneous audio translation (up to 30 languages active)
- ✓Full webinar mode (host, co-host, participants)
- ✓Floor control (speech granted/revoked)
- ✓Real-time chat
- ✓Screen sharing
- ✓Live captions
- ✓Mobile support iOS + Android
Coming soon
- ○Magic link authentication (secure email invitation)
- ○Iframe integration (embed on any website)
- ○Session recording + multilingual transcript
- ○Load-tested to 500 participants
- ○Host dashboard with session statistics
Long-term vision
- ◇Public API for third-party integration
- ◇Broadcast mode >1,000 participants (HLS)
- ◇Embeddable JavaScript widget
- ◇Admin dashboard and automated billing
FAQ — Prism
Organize your first multilingual webinar
Free 30-minute demo. We run a test session in your target languages — no commitment.