About this app
Sound Off adds stylish, animated captions to vertical video, entirely on your iPhone. Open a clip from Photos, and Sound Off transcribes the audio on the device, picks a caption style with you, and writes the finished captioned video back to Photos - ready to post to TikTok, Reels, YouTube Shorts, or anywhere else you share to. Twelve caption styles, including word-by-word animation and full-paragraph captions. No account, no upload, no subscription. WHAT YOU GET • On-device transcription. Sound Off uses Apple's on-device speech model. Your videos, audio, and transcripts stay on the iPhone. • Twelve animated caption styles. Word-by-word styles like Pop Yellow, Karaoke, Classic, and Bounce Bold animate each word as it's spoken. New paragraph styles Reader and Editorial show the whole sentence on screen, with the spoken word highlighted, for talking-head and podcast clips. • Word-level editing. Tap any word to fix a transcription mistake, split or merge phrases, mark where a paragraph ends, or emphasise a word. • Native iPhone export. Save the finished captioned video to Photos in seconds, or send it straight through the share sheet. ON-DEVICE, BY DESIGN Sound Off has no account, no sign-in, and no analytics SDK. We don't track you, and we can't see your videos. The "Data Not Collected" label on this listing is the whole story. ONE-TIME PURCHASE Sound Off is free to try. Free exports carry a small watermark. A one-time unlock removes the watermark and opens the full caption style catalogue. The same purchase works on every iPhone signed into your Apple ID. REQUIREMENTS iPhone 12 or newer, running iOS 26 or later. Vertical, portrait video up to 90 seconds. English and Spanish audio (more languages coming). SUPPORT Email support@soundoffcaptions.app or visit soundoffcaptions.app/support.html
Latest release
What’s New
Sound Off speaks Spanish. • Spanish transcription, on device. Same speed, same privacy as English — nothing is uploaded. Pick your language in Settings, or change it on a clip while you're editing. • The whole app follows your iPhone's language now: menus, buttons, the lot. • Changed your mind? Tap a clip's language chip and Sound Off redoes the captions, keeping your style and your edits.
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 13, 2026 · 5:07 AM Free