Simple Captions AI

Caption Studio records your video, adds eye-catching word-by-word captions and exports it, all on your phone. No account, no uploads, no watermark, no ads. RECORD WITH A TELEPROMPTER • Record in the app with the front or back camera: choose resolution and frame rate, set a timer, turn on the light, show a grid • Paste or type your script and read it from a scrolling teleprompter at the reading speed you set; change the speed and text size any time • A caption guide shows where your captions will appear, so you frame the shot right • Mirror the front camera, or keep an extra copy of every recording in your gallery • Recordings stay on your phone AUTO CAPTIONS THAT WORK OFFLINE • Pick a video, choose the part you want, pick the spoken language and tap Create captions • Or caption another audio or video file, or speak straight into the microphone • Powered by Whisper speech recognition that runs entirely on your device, so your audio never leaves your phone • 14 languages plus automatic language detection • Pick the Tiny, Base or Small model to balance speed and accuracy (one-time download, then it works offline) • Every word gets its own timestamp, so the word being spoken lights up exactly when you hear it CUT THE SILENCE • Finds the long pauses between sentences and skips them, with captions staying in sync • Choose Natural, Fast or Tight, or fine-tune the sensitivity, the shortest silence and how much to keep around each cut • See every cut on the timeline, switch single cuts off, and preview the result before you export 17 CAPTION STYLES, FULLY CUSTOMIZABLE • Karaoke highlights, bold pills, outlined and cinematic looks, plus animated word effects • Pick your default style on the home screen with a live preview • Change the font (15 included), text size, letter case, spacing, colors, outline, background, position and width • Choose how many words appear at a time • Highlight keywords in their own color EDIT LIKE A PRO • Multi-lane timeline: pinch to zoom, drag to scrub, move and trim clips, snap to edges • Transcript editor: fix spelling without losing timing, split, merge, nudge, and find & replace across the whole script • Import SRT, VTT or JSON caption files, or just type your script and let Caption Studio time it for you • Drag, pinch to resize and rotate directly on the video preview • Undo and redo, and trim the video to the part you need • Projects save automatically, so you can come back and keep editing ADD TITLES AND TEXT • Up to 6 text layers at once, each with its own timing • 8 ready-made text templates, plus fonts, colors, outline, background, rotation and opacity • Fade, pop and slide-in animations FAST EXPORT YOU CAN TRUST • Uses your phone's hardware video encoder and automatically falls back to another processor if needed • Export in Auto, 1080p, 720p, 540p or original quality, as H.264 (plays everywhere) or HEVC (smaller files) • Exports keep running in the background with a progress notification • Save to your gallery or share to any app PRIVATE BY DESIGN • Your videos, audio and captions stay on your device • The camera and microphone are used only when you record, and nothing is uploaded • No sign-up, no ads, no analytics • The internet is only used once to download the speech model you choose Available in English and Vietnamese. Requires Android 8.0 or later. Recording asks for camera and microphone access, only when you open the recorder. Speech recognition accuracy depends on audio quality and language, and you can always correct the result in the transcript editor. The Small model needs about 3 GB of RAM. Questions or feedback? Write to [email protected]

First release of Caption Studio! • Auto captions with on-device Whisper (14 languages + auto-detect) • 17 word-by-word caption styles • Multi-lane timeline with pinch-to-zoom • Text layers with animations • Import SRT, VTT and JSON • Hardware-accelerated export in 1080p, 720p, 540p or original quality • English and Vietnamese interface