Are these tools safe to use with production data?

Yes. Every tool runs 100% in your browser using JavaScript. No data is ever sent to a server, so your API keys, tokens, and payloads remain private.

Can I use these tools offline?

CalcHive is a progressive web app (PWA). After your first visit the core tools are cached and available offline.

Do you support dark mode?

Yes. CalcHive detects your system preference and also lets you toggle between light and dark mode manually.

Tools for Web Developers

Web developers juggle dozens of small tasks every day: formatting a JSON payload, decoding a JWT, generating a UUID for a test fixture, or validating an API response. Instead of installing CLI tools or hunting through browser extensions, you can handle all of that from a single tab. Every tool below runs entirely in your browser, which means nothing is uploaded and your data stays private. Bookmark this page and come back whenever you need a quick utility during development.