Instant is a cross‑platform app for 1:1 and group meetings with real‑time transcription and translation. It supports quick calls, calendar scheduling, adding/removing participants, finding users on a map, and starting a call with a QR code. For large events there’s a Conference Mode: several speakers can talk while thousands listen with live translation and captions at near‑imperceptible latency.
Group Participants
1:1 and Group Meetings
Conference Mode
Multi-speaker → Thousands
Join Methods
QR & Map Based
Language Coverage
Major world languages
Plug-and-play Solutions
Speak naturally in your language – captions & translated audio in real time
One platform for quick calls, scheduled meetings, and large broadcasts
Join fast via QR code, map discovery, and invites
On-the-fly translation with live captions needed
Minimal latency via WebRTC
Simple scheduling & participant control
Both small meetings and large conferences
Plavno identified 4 challenges that consistently break live multilingual experiences:
Real-time Translation: Natural speech translation with minimal latency and high accuracy
Flexible Formats: Support for 1:1, groups, and multi-speaker broadcast modes
Smooth UX: Instant start, calendar integration, map discovery, and QR joining
Reliability & Scale: Elastic cloud scaling with consistent performance
Transforming Сommunication
The multilingual voice stack for calls and conferences — modular components, sub-second path, domain accuracy, global reach. Before the architecture, here’s what it does:
Real‑time pipeline: Speech → Transcription → Machine Translation → TTS/Subtitles.
Two call modes: instant and scheduled.
Groups up to 50: add/remove participants on the fly.
Conference Mode: multiple speakers, thousands of listeners.
Map search and QR code call creation.
Call history for 1:1 and group sessions.
Low‑latency WebRTC resilient to packet loss.
Start Now: create a room and invite via QR/link.
Schedule: pick time, participants, and roles (speakers/listeners).
Join a Conference: select language, listen with translated audio, read captions.
Live experience: Sub-second perceived latency that feels conversational.
Accuracy under pressure: Maintains domain fidelity during fast speech and code-switching.
Operational simplicity: Plug-in SDKs; deploy without backend surgery.
Audience scale: Thousands of concurrent listeners per session, multi-region.
Post-event assets: Clean audio + VTT/SRT delivered automatically.
Architecture Overview
Clients: Web (React) and Mobile (React Native) connect to media servers via WebRTC. State via Redux Toolkit / React Query.
RTC/Media layer: nodes on AWS EC2; signaling over WebSocket; media processing in Express/WebRTC services.
STT: dedicated speech‑to‑text server returns partial and final transcripts.
NMT (translation): machine translation module produces target‑language text.
TTS: Azure TTS synthesizes audio; subtitles stream to clients in parallel.
Challenges
Deliver natural, real‑time speech translation.
Support formats: 1:1, groups up to 50, and multi‑speaker → thousands of listeners.
Keep UX smooth: instant start, calendar, map, QR, and call history.
Ensure reliability and elastic scaling on cloud infrastructure.
Value
Horizontal scaling with consistent performance.
Streaming transcripts and captions.
Client‑side language switching without reconnects.
Role control (speaker/listener) and moderation tools in conferences.
Custom glossaries, RAG domain terms, and pronunciation control keep names & acronyms correct.
Benchmarks
Enterprise-grade infrastructure designed to handle massive concurrent loads while maintaining consistent sub-second response times
Horizontal scaling of RTC/STT/TTS nodes on AWS EC2.
Room isolation and a cap of up to 50 participants for regular groups.
Broadcast mode “multiple speakers → thousands of listeners.”
Zone-aware failover with rolling deploys and self-healing health checks.
End-to-end delivery (median)
Participants per group room
Concurrent listeners in Conference Mode (multi-speaker broadcast)
Data Protection
Enterprise-grade security with role-based access
TLS encryption and Cloudflare WAF
JWT token authentication and authorization
Role-based access control and permissions
Innovative Experience
Instant serves diverse industries with specialized use cases, delivering measurable value across different adoption patterns
Telemedicine consultation. Break language barriers for patient care
Global online classrooms. Inclusive learning experiences
International conferences. Global audience engagement
Multilingual service calls. Improved customer satisfaction
Cross-border negotiations. Enhanced deal closure rates
Community meetings. Democratic participation
Live interviews. Real-time global coverage
Guest services. Enhanced customer experience
Supply chain coordination. Streamlined operations
International consultations. Compliance and trust building
Cross-jurisdictional proceedings. Accurate legal communication
Humanitarian coordination. Global collaboration efficiency
Delivery Crew
High-performing developers for growing companies
Renata Sarvary
Sales Manager
Speak naturally, in any language. No pauses or context switching—stay in your native language and keep the flow.
Talk to an ExpertCompetitive Ability
Production metrics that demonstrate capability, scale, and reliability.
Create & Share
Host opens an instant or scheduled room and shares a link or QR.
Connect & Ingest (WebRTC)
Listeners join via WebRTC; speaker audio streams to the media server.
Live STT
Streaming ASR returns partial and final transcripts in real time.
Sync to Voice & Captions
Translated text drives TTS for audio while the UI renders subtitles in parallel.
Streaming STT (partial + final transcripts)
NMT for live translation to multiple languages
Azure Neural TTS for natural translated audio; captions in parallel
Client-side language switching; roles & moderation for conferences
Instant & Scheduled calls (calendar integration)
QR/link join and map search; add/remove participants on the fly
Optional S3 storage for transcripts/recordings with configurable retention
Admin console (Refine + React Query) to manage sessions, users, roles
1:1 + groups up to 50 participants
Conference Mode: multi-speaker → thousands of listeners
Sub-second perceived latency with WebRTC + streaming STT/NMT/TTS
Horizontal scaling of RTC/STT/TTS nodes on AWS EC2
Real outcomes from production—speed, accuracy, and scale.
Natural multilingual conversations without context switching
Faster join & setup thanks to QR and map discovery
Higher inclusivity for cross‑border teams and events
Lower cognitive load with live captions and easy language switching
Reliable experience at scale via horizontally scaled RTC/STT/TTS nodes
Tools We Used
Project Estimator
The estimated time to launch the product
Clear vision of functionality you need
15% discount on your first sprint
Frequently Asked Questions
Find answers to your common concerns
Up to 50 in regular rooms; in Conference Mode, multiple speakers with thousands of listeners.
Session artifacts can be stored in AWS S3 when enabled; retention is configurable.
Sub‑second perceived delay in typical networks, thanks to WebRTC and streaming STT/NMT/TTS.
TLS, token‑based auth, RBAC, Cloudflare WAF/CDN, and isolated rooms; access is scoped by roles.
Translated audio (TTS) and on‑screen captions; listeners can switch languages.
Use Conference Mode to assign speaker roles and broadcast to thousands with live translation.
Web app (React) and mobile app (React Native, details TBD).
About Plavno
Proven by our
customers feedback
Senior engineers + proven AI components to accelerate time-to-value.
From MVPs to enterprise platforms at global scale.
From extension UX to GPU pipelines and global scale.
Testimonials
“They really understand what we need. They’re very professional.”
Sergio Artimenia
Commercial Director, RNDpoint
“We appreciated the impactful contributions of Plavno.”
Thien Duy Tran
Product Manager, T-Rize Group
“We are very satisfied with their excellent work”
Michael Bychenok
CEO, MediaCube
“They have a clear understanding of what the end user needs.”
Helen Lonskaya
Head of Growth, Codabrasoft LLC
“The app was delivered on time without any serious issues.”
Mitya Smusin
Founder, 24hour.dev
Contact Us
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Vitaly Kovalev
Sales Manager
