AI Subtitle Studio
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About this app
AI Subtitle Studio is an AI-powered video editing suite for your phone. Accurate stylised subtitle generation, smart automatic splicing, multimodal AI-driven video enhancement. Professional-grade tools distilled into an easy-to-use mobile interface with precise control when you need it.
The magic tools can do a lot of really cool things without much input: auto-transcribe your video, style your captions, suggest B-roll and music, even tighten your edit. But beyond the AI, it's a fully featured subtitle editor and video caption maker with fine-grained control over styling, timing, multi-track layers, and built-in stock media.
AI SUBTITLE GENERATOR - SPEECH TO TEXT
Automatically add subtitles to video with accurate word-level timestamps. On-device speech-to-text (free, fast, offline) or cloud AI via Gemini for higher accuracy. Auto-generate captions in 12+ languages: English, Spanish, French, German, Japanese, Korean, Chinese, Arabic, Hindi, and more.
SUBTITLE EDITOR & TRANSCRIPT CLEANUP
Edit text, timing, and splits directly. Remove filler words ("um," "uh," "like") with one tap. Smart Pacing re-segments for readability. Multi-Replace fixes repeated transcription errors across all subtitles at once.
TRANSLATE SUBTITLES
Translate all captions instantly with AI. Word-level timing stays synced, no manual re-timing needed.
SUBTITLE TEMPLATES & PRO STYLING
13 creator-inspired templates (MrBeast, Hormozi, Ali Abdaal and more) or build your own. Per-word styling: fonts, colour, bold, italic, glow, shadow, outline, stroke. Karaoke animations: wipe, pop, rise, highlight. Or describe a look in plain text and AI Style Generation creates it for you.
KARAOKE MODE & WORD EFFECTS
FX Mode triggers per-word animations as they're spoken. Colour, font, and size changes on playback. Add Pop, Shake, and Glow effects for animated emphasis.
AI VIDEO ENHANCEMENT
The AI analyses your video and transcript together, then suggests enhancements you'd normally spend hours doing manually:
- B-roll stock footage placements
- GIF overlays timed to your content
- Emoji overlays at contextual trigger words
- Background music matching your video's mood
Style presets: Professional (Corporate, Documentary, Cinematic) or Viral (Brainrot, TikTok, Video Essay). Subject Tracking positions assets around detected subjects in-frame.
AI SEMANTIC STYLING
Analyses your transcript for emotions, emphasis, and pacing, then auto-applies colours and styles to matching words. Multimodal mode also analyses the video for context-aware styling.
AI VIDEO EDITING & SMART CUTS
Detects filler words, silences, and weak segments, then builds a cut list to tighten your edit. Review every cut before applying.
VIDEO TIMELINE & LAYER EDITOR
Multi-layer composition timeline. Add images, text overlays, video clips, shapes, and GIFs with precise positioning and keyframe animation. 15 layout templates for viral formats: Black Bar Caption, Classic Meme, POV Scenario, and more. Track management with layer ordering, locking, linking, and duplication.
STOCK VIDEO, IMAGES, GIFS & MUSIC
Built-in media browser:
- Pexels - royalty-free stock videos and images
- Klipy - GIF search
- Internet Archive - Community-created & Creative Commons (royalty free) licensed music
EXPORT SUBTITLES & VIDEO
MP4 or WebM, up to 4K at 60fps. Customise bitrate, codec, and H.264 profile. Export SRT or VTT subtitle files, or burn captions directly into your video.
OFFLINE & FREE - NO SUBSCRIPTION
On-device transcription works offline. Projects stored locally, no account needed, no subscription.
Whether you're a YouTuber adding auto captions, a TikTok or Reels creator styling viral clips, a podcaster cutting highlight reels, an educator making accessible content, or just someone who wants professional captions or free AI subtitle generation without the learning curve, the app is accessible and easy-to-use for all experience levels.
The magic tools can do a lot of really cool things without much input: auto-transcribe your video, style your captions, suggest B-roll and music, even tighten your edit. But beyond the AI, it's a fully featured subtitle editor and video caption maker with fine-grained control over styling, timing, multi-track layers, and built-in stock media.
AI SUBTITLE GENERATOR - SPEECH TO TEXT
Automatically add subtitles to video with accurate word-level timestamps. On-device speech-to-text (free, fast, offline) or cloud AI via Gemini for higher accuracy. Auto-generate captions in 12+ languages: English, Spanish, French, German, Japanese, Korean, Chinese, Arabic, Hindi, and more.
SUBTITLE EDITOR & TRANSCRIPT CLEANUP
Edit text, timing, and splits directly. Remove filler words ("um," "uh," "like") with one tap. Smart Pacing re-segments for readability. Multi-Replace fixes repeated transcription errors across all subtitles at once.
TRANSLATE SUBTITLES
Translate all captions instantly with AI. Word-level timing stays synced, no manual re-timing needed.
SUBTITLE TEMPLATES & PRO STYLING
13 creator-inspired templates (MrBeast, Hormozi, Ali Abdaal and more) or build your own. Per-word styling: fonts, colour, bold, italic, glow, shadow, outline, stroke. Karaoke animations: wipe, pop, rise, highlight. Or describe a look in plain text and AI Style Generation creates it for you.
KARAOKE MODE & WORD EFFECTS
FX Mode triggers per-word animations as they're spoken. Colour, font, and size changes on playback. Add Pop, Shake, and Glow effects for animated emphasis.
AI VIDEO ENHANCEMENT
The AI analyses your video and transcript together, then suggests enhancements you'd normally spend hours doing manually:
- B-roll stock footage placements
- GIF overlays timed to your content
- Emoji overlays at contextual trigger words
- Background music matching your video's mood
Style presets: Professional (Corporate, Documentary, Cinematic) or Viral (Brainrot, TikTok, Video Essay). Subject Tracking positions assets around detected subjects in-frame.
AI SEMANTIC STYLING
Analyses your transcript for emotions, emphasis, and pacing, then auto-applies colours and styles to matching words. Multimodal mode also analyses the video for context-aware styling.
AI VIDEO EDITING & SMART CUTS
Detects filler words, silences, and weak segments, then builds a cut list to tighten your edit. Review every cut before applying.
VIDEO TIMELINE & LAYER EDITOR
Multi-layer composition timeline. Add images, text overlays, video clips, shapes, and GIFs with precise positioning and keyframe animation. 15 layout templates for viral formats: Black Bar Caption, Classic Meme, POV Scenario, and more. Track management with layer ordering, locking, linking, and duplication.
STOCK VIDEO, IMAGES, GIFS & MUSIC
Built-in media browser:
- Pexels - royalty-free stock videos and images
- Klipy - GIF search
- Internet Archive - Community-created & Creative Commons (royalty free) licensed music
EXPORT SUBTITLES & VIDEO
MP4 or WebM, up to 4K at 60fps. Customise bitrate, codec, and H.264 profile. Export SRT or VTT subtitle files, or burn captions directly into your video.
OFFLINE & FREE - NO SUBSCRIPTION
On-device transcription works offline. Projects stored locally, no account needed, no subscription.
Whether you're a YouTuber adding auto captions, a TikTok or Reels creator styling viral clips, a podcaster cutting highlight reels, an educator making accessible content, or just someone who wants professional captions or free AI subtitle generation without the learning curve, the app is accessible and easy-to-use for all experience levels.
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What’s new
New in 1.0.6:
- Old sample files and code refs sanitized for IARC approval
- Transitions between clips: crossfades and fades w/ audio
- Long jobs (transcription, exports, AI) now keep running when you leave the app and notify you the moment they're done.
- Many more audio and video formats now play and convert cleanly.
- On-device transcription is far steadier on lower-memory phones.
Plus failed AI jobs now refund your credits, and a pile of smaller fixes. Thanks for sticking with me!
- Old sample files and code refs sanitized for IARC approval
- Transitions between clips: crossfades and fades w/ audio
- Long jobs (transcription, exports, AI) now keep running when you leave the app and notify you the moment they're done.
- Many more audio and video formats now play and convert cleanly.
- On-device transcription is far steadier on lower-memory phones.
Plus failed AI jobs now refund your credits, and a pile of smaller fixes. Thanks for sticking with me!
Everyone
Learn moreApp support
phone
Phone number
+447493854217
About the developer
Luke Moran
fstopfoundry@gmail.com
13 Brodie Close
CHESTER
CH2 4AX
United Kingdom
