AI & Agents
Stack Exchange · 2024-10-23
A real-life Babelfish: offline, open-source real-time speech-to-speech translation on a phone
手机上的『巴别鱼』：离线、开源的实时语音对话翻译
At a glance · 30-second read
- WhoStack Exchange · 2024-10-23 · 5 upvotes
- The askA real-life Babelfish: offline, open-source real-time speech-to-speech translation on a phone
- The openingAn on-device pipeline: Whisper-class STT + local translation model + TTS bundled into one offline app. Sell language packs or a Pro tier.
What was actually said
“Looking for a Babelfish: real-time speech-to-speech translation on an Android phone, fully offline and open source — set the output language, talk to the phone in English, and it speaks the translation.”
— Stack Exchange · 2024-10-23 · softwarerecs.stackexchange.com/questions/91360/offli…
Background and pain
The pain
Speech translation is cloud-bound: no network, no translation, everything you say gets uploaded; offline options are fragmented.
A buildable angle
The opening
An on-device pipeline: Whisper-class STT + local translation model + TTS bundled into one offline app. Sell language packs or a Pro tier.
How to validate it
- Read the whole thread and note the recurring scenarios — repetition is the density of the need.
- Search existing tools around "speech translation / on-device ai" and check which single step they actually cover.
- Put up a one-line landing page, share it back to Stack Exchange, and see whether anyone asks about pricing.
Existing options
在线翻译 App 的对话模式离线方案各自为战
More threads on this pain
Consumer hardware & privacy (7)
- Why is there no small Android phone? 191 points, 220 commentsHacker News · 2022-02-20
- RSI makes typing impossible, yet PC voice control is still unreliableHacker News · 2022-01-28
- A medication manager for the elderly: med info, alarms, remote family viewStack Exchange · 2024-05-07
- The 2025 password-manager landscape is impossible to compareStack Exchange · 2025-04-23
- Cloud storage with built-in antivirus scanning on every uploadStack Exchange · 2025-01-31