RTranslator

RTranslator is the world's first open source real-time translation app.

RTranslator is an (almost) open-source, free, and offline real-time translation app for Android.

Connect to someone who has the app, connect Bluetooth headphones, put the phone in your pocket and you can have a conversation as if the other person spoke your language.

Conversation mode

WalkieTalkie mode and Costs

Conversation mode The Conversation mode is the main feature of RTranslator. In this mode, you can connect with another phone that uses this app. If the user accepts your connection request:

When you talk, your phone (or the Bluetooth headset, if connected) will capture the audio.

The audio captured will be converted into text and sent to the interlocutor's phone.

The interlocutors' phone will translate the text received into his language.

The interlocutors' phone will convert the translated text into audio and will reproduce it from its speaker (or by the Bluetooth headset of the interlocutor if connected to his phone).

All this in both directions.

Each user can have more than one connected phone so that you can translate conversations between more than two people and in any combination.

WalkieTalkie mode If conversation mode is useful for having a long conversation with someone, this mode instead is designed for quick conversations, such as asking for information on the street or talking to a shop assistant.

This mode only translates conversations between two people, it doesn't work with Bluetooth headsets, and you have to talk in turns. It's not a real simultaneous translation, but it can work with only one phone.

In this mode, the smartphone microphone will listen in two languages (selectable in the same screen of the walkie talkie mode) simultaneously. The app will detect in which language the interlocutor is speaking, translate the audio into the other language, convert the text into audio, and then reproduce it from the phone speaker. When the TTS has finished, it will automatically resume listening.

Text translation mode This mode is just a classic text translator, but always useful.

General RTranslator uses Meta's NLLB for translation and OpenAi's Whisper for speech recognition, both are (almost) open-source and state of the art AIs, have excellent quality and run directly on the phone, ensuring absolute privacy and the possibility of using RTranslator even offline without loss of quality.

Also, RTranslator works even in the background, with the phone on standby or when using other apps (only when you use Conversation or WalkieTalkie modes). However, some phones limit the power in the background so in that case it is better to avoid it and keep the app open with the screen on.

RTranslator - Open-source and offline simultaneous translator for Android | Product Hunt

GUI Designed by Chiara Chindamo.

RTranslator does not collect any personal data (I don't even have a server).