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string.is vs DevKnife: catalog facts
string.is	DevKnife
Free Free to use and open source under the AGPL-3.0 licence.	Paid Paid app with a 30-day free trial that needs no sign-up or card.
Web, Self-hosted	macOS
Detects the input format and suggests output options Sets no cookies and uses a strict Content Security Policy	Many everyday developer tools in one app Processes data locally and works offline
Internet Explorer is not supported Limited to the formats its converters cover	macOS only Paid after the trial
Web application, Self-hosted	Downloadable app
Open source	Closed source
License: AGPL-3.0	License not stated
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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