Real-time · Multilingual · AI

Live Calls — Real-Time Multilingual Translator

Break language barriers with live audio, video, and text translation powered by cloud and on-device AI.

Live Calls is a real-time multilingual translator app that combines speech recognition, translation, and speech synthesis with secure chat and offline models. Use it for cross-border teams, customer support, education, and live events where people don’t share a common language — but still need fluid, natural conversations.

Ideal buyers

Tech companies, BPOs, education platforms, conferencing tools, global communities.

Highlights

Live video calls, speech-to-speech translation, encrypted chat, offline models, AWS secrets.

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Overview

What Live Calls does

Live Calls provides a real-time, multilingual communication layer on top of audio and video calls. Users select source/target languages, then speak naturally while the app transcribes, translates, and plays back translated speech. A secure text chat runs alongside the call for links, notes, and backup communication.

The problem it solves

Cross-language communication is often slow and awkward, relying on manual translators or copy-pasting text into translation websites. Live Calls brings translation directly into the call experience, minimizing friction and latency, and giving teams a tool that feels native and integrated rather than bolted on.

Key features

All the essentials for high-quality, multilingual live conversations.

🗣 Real-time translation

Bi-directional translation between multiple languages in real time.
Speech-to-text, translation, and text-to-speech stitched into a single pipeline.
Configurable latency/quality trade-offs.
Automatic language detection mode (optional).

📹 Live video & audio

Live audio/video calling powered by Agora RTC Engine.
Call controls: mute, camera toggle, speaker/source selection.
Optional live transcription overlay for accessibility.
Room or channel-based call structure for teams & groups.

🔐 Encrypted messaging

End-to-end encrypted text chat alongside live calls.
Configurable auto-deletion time windows (per session, 24h, custom).
AES-based encryption for message payloads with rotating keys.
Support for attachments and links (policy-based).

📶 Offline mode & caching

Offline translation using TensorFlow Lite models when network is poor.
Dynamic caching of frequent phrases and translations.
Graceful degradation from full cloud stack to on-device only.
Settings screen to manage offline models and storage.

Architecture & project structure

Flutter front-end, Google Cloud & AWS on the backend, and RTC for calls.

live-calls-translator/
├─ lib/
│  ├─ call/                     # Call UI, Agora bindings, call state
│  ├─ translation/              # STT, MT, TTS pipeline orchestration
│  ├─ chat/                     # Encrypted chat, message lifecycle
│  ├─ settings/                 # Language selection, offline mode, preferences
│  ├─ secrets/                  # AWS-backed secret fetching services
│  ├─ offline/                  # TensorFlow Lite models & on-device routing
│  └─ shared/                   # Common widgets, theme, utilities, models
└─ backend/                     # Optional proxy backend for AWS + Google APIs

The app can be restructured into multiple Flutter packages (e.g. `live_calls_core`, `live_calls_translation`, `live_calls_ui`) if you prefer a package-based architecture.

Tech stack

Battle-tested cloud APIs and SDKs with strong security posture.

Layer	Technology
Frontend	Flutter (Dart) for cross-platform mobile and optional web.
RTC	Agora RTC Engine for live audio/video.
Cloud AI	Google Speech-to-Text, Translation, Text-to-Speech.
Secrets	AWS Secrets Manager for API keys and credentials.
Encryption	AES encryption for chat plus TLS for all backend calls.
Offline	TensorFlow Lite models for on-device transcription & translation.

Getting started (developer)

Spin up Live Calls locally with Flutter and your cloud credentials.

# Clone the repo
git clone https://github.com/YOUR_ORG/live-calls-translator.git
cd live-calls-translator

# Install dependencies
flutter pub get

# Run the app
flutter run

Supported languages (sample)

English (en)
French (fr)
Spanish (es)
German (de)
Chinese (zh)
Japanese (ja)

The language list is fully configurable and can be extended with additional pairs and dialects.

Interested in Live Calls?

Share your use case (support, conferencing, EdTech, healthcare, etc.) and we’ll send you a tailored briefing, technical docs, and licensing options.