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regex101 vs Expressions: catalog facts
regex101	Expressions
Freemium Free to use, with a paid Pro upgrade and enterprise option.	Paid Commercial Mac app from Apptorium; see the website for current pricing.
Web	macOS
Plain-language explanation of a pattern as you type Supports PCRE2, JavaScript, Python and other flavors	Live preview of matches while editing Library for saving expressions
Requires a browser and internet connection Some features require a Pro upgrade	macOS only Not open source
Web application	Downloadable app
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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