Region tags with captions
Draw boxes and label parts of an image. Keep global and per region text tidy and exportable.
Pro captioning • local first
Caption faster. Stay private. Ship work you are proud of.
Captyon is a desktop app that runs in your browser. Region tags with per area captions, bulk editing that actually saves time, and optional AI assist that never uploads your images.
512 x 512 aware
Aspect guard for training friendly crops
Offline by default
No account required
Project: fashion shoot
Region Tag Demo
Drag to draw a box. Press Enter to add caption.
Demo is synthetic and runs locally in this page.
Why teams switch to Captyon
Fast workflows, predictable output, and no cloud surprises
Local AI assist
Connect to an on device model for suggestions. Your files do not leave your machine.
Bulk editing that saves hours
Prefix, suffix, find and replace, case transforms, selection filters, and history with undo.
Project structure
Organize by project with tags and status. Export to JSON or ZIP with sidecar text.
Auto brightness control
Detects over bright frames and tempers glare to reduce fatigue during long sessions.
Privacy by default
Offline mode, deterministic outputs, and transparent permissions for any integration.
Screenshots
Clean interface focused on speed and accuracy
Choose how you run it
Self hosted for full control or Cloud for zero setup
Self Hosted
Bleeding edge-
Feature velocity
Bleeding edgeNew features land first
- Support Community docs and issues
- Cost Free • open source
- Setup time About 5 minutes
- Offline mode Yes
- Team collaboration Manual sync
Cloud
Stable-
Feature velocity
StableProduction ready
- Support Priority support
- Cost Free tier • paid plans
- Setup time About 30 seconds
- Offline mode Online Only
- Team collaboration Built in
Quick start
Clone, install, and run
# Clone git clone https://github.com/captyon/captyon.git cd captyon # Install npm install # Dev server npm run dev # Open http://localhost:5173