RosettaCube

RosettaCube — Real-time multilingual subtitles from your microphone.

No complicated setup! RosettaCube transcribes your microphone input in real time and simultaneously translates it into multiple languages for display on your live stream. Drop the URL into OBS to add multilingual subtitles to your stream instantly.

Perfect for

• Live streamers & VTubers who want international viewers to follow along
• Presenters and online teachers who want to add multilingual captions

Key features

• Real-time transcription: Converts microphone input to text instantly (choose WebSpeech or Google Cloud STT)
• Simultaneous multi-language translation: Display English, Chinese, Korean, and more at the same time
• Built-in OBS overlay: Copy the URL and add it as a browser source in OBS — that's it
• Fully customizable appearance: Adjust font, text color, background color, and size to match your stream layout
• Audio input device selection: Choose your microphone directly inside the app
• Light / Dark / System theme: Follows your OS color scheme or set it manually
• Portable: All settings and history are stored in the same folder as the exe — carry it on a USB drive
• Translation history: Review and search past sessions

Get started in 3 steps

1. Download and unzip, then launch rosettacube.exe
2. Select your audio input device and target languages
3. Paste the displayed URL into an OBS browser source (optional)

System requirements

• Windows 11

About API keys

• WebSpeech (SpeechRecognition) requires no API key. Start transcribing immediately.
• For higher accuracy, switch to Google Cloud STT (requires Google Cloud credentials).
• To use TexTra or Google Cloud Translate for translation, obtain an API key from the respective service and enter it in the app's settings.