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IT Tools vs string.is: catalog facts
IT Tools	string.is
Free Free and open source.	Free Free to use and open source under the AGPL-3.0 licence.
Web, Self-hosted	Web, Self-hosted
Bundles many small everyday dev utilities in one consistent interface Can be self-hosted for privacy or offline use	Detects the input format and suggests output options Sets no cookies and uses a strict Content Security Policy
Individual tools are simple and may not match dedicated single-purpose apps in depth Self-hosting requires running your own instance	Internet Explorer is not supported Limited to the formats its converters cover
Web application, Self-hosted	Web application, Self-hosted
Open source	Open source
License not stated	License: AGPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.