About Capsule
Capsule lets you build and share small personal tools, such as trackers, calculators or a recipe book, that live in a single .capsule file. Each file bundles the interface, its assets and an embedded SQLite database, so your data is saved inside the file and can be sent by email, AirDrop or a chat app like any document. You can start from a template, describe the tool to ChatGPT, Claude or Gemini using Capsule's prompt, or write HTML, CSS and JavaScript yourself. Files run offline in a sandboxed webview with a strict content security policy, and a three-way merge tool helps when copies synced through Dropbox, iCloud or OneDrive drift apart. Capsule is free and open source, with desktop apps for macOS, Windows and Linux and a browser version for quick previews; iOS and Android apps are listed as coming soon.
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