SubFlowA sentence at a time.
SubFlow transcribes ahead of playback on seekable media and shapes speech into readable sentences. Jump to another moment and recognition follows.
On-device recognitionA subtitle-first video player
Stay in the story.
Follow every word.
Your videos, with subtitles that keep up. SubFlow turns speech into complete sentences on your iPhone or iPad, so you can settle in and watch.
For iPhone & iPad · iOS / iPadOS 26 or later
Coming soon on the App Store
A quiet escapeSUBTITLE PREVIEW
THE LONG WAY HOME
There’s a whole world beyond the familiar.熟悉的风景之外，还有整个世界。
Speech recognition on your device
Two languages, one picture
No accounts. No ads. No tracking.
Made for the way you watch
Less searching for subtitles.
More getting into it.
From a favorite film to a saved lecture, keep the words close to the picture.
Two languages. Together.
Keep the original and a translation in view. Built with Chinese, Japanese, and bilingual reading in mind, with adjustable subtitle styles.
Bilingual subtitles · ProWords worth keeping.
Export SRT, VTT, ASS, or TXT subtitle files with Pro, without SubFlow attribution. Refine text and timing, then use your subtitles wherever you need them.
Subtitle file export · ProBring your own library
Your collection.
Make yourself at home.
Open a video from Files, or connect your NAS or media server for free. SubFlow reads and plays your media without changing files on your server.
Playback depends on the file’s codec and your device. DRM-protected content is not supported.
- Local files & Apple FilesIncluded
- SMB · WebDAV · FTP / FTPSIncluded
- Emby · JellyfinIncluded
Start watching. Go further.
A useful free player.
More possibilities with Pro.
SubFlow Free
Full-length playback. A first taste of automatic subtitles.
- Play your videos without a playback time limit
- Generate subtitles for the first 10 minutes of each video
- Use existing embedded or external subtitles and shift their timing
- Connect to all supported network media sources
- Adjust subtitle size, position, black outline, and background opacity
SubFlow Pro
Monthly or yearlyOne set of features. Choose the billing period that suits you.
- Generate subtitles beyond the free 10-minute limit
- Bilingual translation, advanced styles, and presets
- SRT / VTT / ASS / TXT export without SubFlow attribution
- Batch transcription with pause and resume
- Subtitle editing and AI timing alignment
Prices and available plans are shown in the app before purchase. Subscriptions renew automatically unless canceled. Optional bring-your-own-key (BYOK) services are billed separately by your provider. Subscription details
Recognition and translation depend on device, language, and installed model availability. A network connection may be needed to download models. Transcription is designed for interruptible foreground use; continuous background processing is not guaranteed.