Guide
Which live translation apps keep your audio on the iPhone?
Fewer than you might think. Recognising speech and translating it takes large models, and many translation apps send the audio, or the text taken from it, to a cloud service to do the work. Apple's own features and a few apps run everything on the iPhone instead. Hono Translate is one of them: the audio it translates never leaves the device.
Why it matters
An app that captures your iPhone's audio hears everything the phone plays while it runs: the livestream, but also a voice message or a video a friend sent. If that audio is processed in the cloud, it goes to someone else's server, and the privacy policy decides what happens to it there.
Running on the device also means it works without a connection, and there is no per-minute server cost that has to be paid for with daily limits.
How to tell
- Try airplane mode. Use a video saved on your iPhone, turn on airplane mode and start the app. If subtitles still appear, recognition and translation run on the device. If nothing appears, or it asks for a connection, they do not.
- Read the privacy policy. Look for the names of cloud speech or translation services, or phrases like "processed on our servers" or "third-party AI providers". A clause about falling back to the cloud means some of your audio goes there.
- Look at the pricing. Free minutes per day and passes sold by the minute often mean each minute costs the developer money, which usually means a server. It is a hint, not proof.
- Do not rely on the App Privacy label alone. Apple does not count data as collected when it is only processed in real time and not kept, so an app can send audio to a server and still list no audio.
Where the audio is processed
| Feature or app | Where the audio goes |
|---|---|
| Live Captions | Stays on the iPhone |
| Live Translation | Stays on the iPhone, with Apple Intelligence |
| Apple Translate, for downloaded languages | Stays on the iPhone |
| Hono Translate | Stays on the iPhone, after the first download for each language pair |
| Translation apps that use a server | To the developer's or a cloud provider's servers |
Live Captions and Live Translation do not translate a video playing in another app; what Live Captions does and what to use instead covers that.
What stays on your phone with Hono Translate
The audio iOS hands the app, the speech recognised from it and the translation all stay on the iPhone. Recognition uses Apple's on-device speech models, and the translation models are downloaded once and then used offline. There is no account.
The app does send a few anonymous usage statistics — which features are used, with no name or email — to the developer's own iCloud database, and a message you send from the in-app feedback form goes there too, not to a third-party server. Neither ever contains audio or subtitles.
Questions
Does Hono Translate work offline?
Yes, once the models for a language pair are downloaded. The first time you use a pair it needs a connection for that download; after that, subtitles appear with no network at all.
Is on-device translation worse than the cloud?
For some language pairs a large cloud model can be more fluent. On-device models are smaller, but they answer without a round trip to a server, cost nothing per minute and keep the audio private. For following a video as it plays, speed and privacy usually matter more.
Does an app have to say if it uploads my audio?
Its privacy policy should. The App Privacy label may not show it, because audio processed in real time and not kept is not counted as collected.
Will the platform or the streamer know I am translating?
No. The app works on the audio your iPhone is already playing, and nothing is sent to the platform.
Can an iPhone app hear the sound another app is playing? Do I need a second phone?
Yes, and one iPhone is enough. Through screen sharing — the iOS sheet you confirm when you start — iOS hands the sound that is playing to the app you pick. Hono Translate takes that audio from iOS, not from the microphone, so headphones are fine, and its subtitles float in a Picture-in-Picture window over TikTok, YouTube or any other app.
For the setup, see how to translate any video you watch on iPhone.
Guides for specific apps
- How to translate a YouTube video or live stream on iPhone, even with no captions (free to try)
- How to translate a TikTok LIVE on iPhone in real time (one phone, free to try)
- How to translate an Instagram Live on iPhone in real time
- How to get live translated captions on a Twitch stream on iPhone
- How to get translated subtitles on a Weverse live on iPhone (one phone, with or without membership)