Capsule - a whole app packed into one file that sends like a PDF

Describe what is needed and it generates a single .capsule container holding the HTML interface, the schema and a local SQLite database. Send it over WhatsApp, AirDrop or email; opening the file launches the app with all data already inside.

- runs fully offline with no accounts and no servers, so there is no cloud storage to breach and no subscription attached to the data
- plain HTML and CSS inside, which means no vendor lock-in, and features or schemas can be reworked later through MCP coding tools
- free, with desktop players for macOS, Windows and Linux; iOS and Android are listed as coming soon, and the browser version previews but cannot save files

The honest use case is internal tools and one-off trackers that never deserved a cloud account in the first place, because anything genuinely multi-user is out of scope by design.

https://withcapsule.app/

📎 Read also:
→ Kanwas - open-source canvas where every doc is a plain .md file
→ KanBots - kanban board that dispatches agents into git worktrees
→ Harden - a local guard over what your coding agent is about to do