Ternframe · App 01 · In development
Live, two-line subtitles for whatever you're watching.
The original line and its translation, as people speak — over the videos and live streams on your iPhone, iPad or Android phone.
Full-screen mode · scripted demo, simulated interface
Three steps, in real time — and no Ternframe server anywhere in between.
On iPhone and iPad, Lowline listens to the audio of the video playing in its own browser, rather than your microphone. On Android, it uses the system's audio-capture permission, which you grant each session, and respects apps that block capture.
Audio streams over an encrypted connection straight to the speech-recognition service you've connected with your own key. Words appear as they're heard and firm up as each sentence completes.
Each sentence is paired with its translation, and both lines scroll smoothly up over the video. For harder material, an optional context-aware mode refines translations with a language model you choose.
Each platform gets the design that suits it best — not one app stretched over two.
iPhone · iPad
Open video and live-stream pages inside Lowline and start subtitles with one tap. Everything stays in one place, in portrait or landscape.
Android
Start Lowline, switch to your usual video app, and subtitles float above it — nothing else on screen.
Three presets named after the screens they come from. Try them.
You decide which services hear your audio. We never do.
API keys are stored in the iOS Keychain or the Android Keystore and are never sent to Ternframe.
Audio and text travel over TLS straight to the providers you've chosen and are handled under their terms and privacy policies.
Lowline does not save audio recordings. Subtitle history, when you choose to keep it, stays on your device.
On Android, the system asks for capture permission each time, and Lowline confirms before any audio is sent. No account is required on either platform.
Details will be published in Lowline's own privacy policy before release. See also the Ternframe Privacy Policy.
Plain answers about what Lowline can and can't do.
Lowline works with most videos and live streams that play in a standard web player. Content protected by DRM, as used by most subscription streaming services, can't be captured by design, and some sites may not be compatible.
Lowline recognizes speech in the many languages supported by your speech provider. At launch, subtitles can be translated into English, Simplified Chinese and Japanese, with more to follow.
Yes. The first release uses your own account with a speech-recognition provider (Soniox) and, optionally, a language-model provider such as OpenAI or DeepSeek for context-aware translation. Providers bill you directly for what you use.
No. Audio is streamed to the provider you choose in order to produce subtitles and is not saved by Lowline. Each provider's own data policy applies to what it receives.
Lowline will be free to download and use with your own key. An optional Pro upgrade, as a one-time purchase or annual plan, will add advanced styles, context-aware translation, subtitle export and multi-tab sessions. Prices will be announced at launch.
We are planning a public release in 2027, with a beta beforehand. Join the waitlist and we'll let you know.
Be among the first to watch with Lowline.