RTST vs NoNetPlay

Recognize your Voice and Translate in RealTime. It supports chatting function for communication among participants. It is also translated in real time to match the other person's language. All sessions are recorded so that you can easily check them later.

Real-time simultaneous interpretation, completely offline. NoNetPlay translates live conversations as you speak — your voice never leaves your iPhone, even when you're 30,000 feet up. Unlike apps that need to download language packs every time you want a new language, NoNetPlay's entire AI translation engine lives on your iPhone. Download the models once (about 2.9 GB, Wi-Fi recommended), then use it offline from then on. Simultaneous Translation — 14 Language Pairs • Chinese ↔ English, Japanese, Spanish, German (stable); Chinese ↔ Korean, Portuguese, Indonesian, Vietnamese, Dutch, Arabic, Italian, Russian, Thai, Hindi (experimental) • Every pair translates between Chinese and one other language • Speak in one language, hear it in another — automatic language detection • Voice recognition + AI translation engine, both run entirely on-device • Sentence-by-sentence output with synchronized voice playback — no waiting AI Chat • Built-in offline AI assistant for free-form conversations • Switch between different on-device AI options mid-conversation • Real-time output, word by word as it generates Privacy First • Every word stays on your iPhone — no servers, no cloud, no logs • No account, no login, no subscription pressure — just open and use Offline AI Download Manager Built-in download manager with multiple sources (domestic mirrors prioritized for users in mainland China). Resume on interruption supported. Available offline AI options: • Translation AI (~984 MB) — runs alongside voice recognition for fluid real-time translation • Voice Recognition (~1.6 GB) — multi-language voice detection across 15+ languages • Advanced Chat AI (3.5 GB) — more powerful AI chat capability • Plus Chat AI (2.5 GB) — balanced everyday conversation Use Cases • On a flight — interpretation works in airplane mode • In a foreign hotel — no roaming charges, no WiFi search • In meetings — discuss freely without sending audio to a cloud server • Language learning — practice anywhere, anytime • Business travel — confidential conversations stay confidential