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proselint vs PerfectIt: catalog facts
proselint	PerfectIt
Free Free and open source under the BSD 3-Clause licence.	Paid Paid software with a free trial that needs no credit card details.
Windows, macOS, Linux, Command line	Windows
Checks based on established usage guides and editors Works on plain files from the command line	Checks consistency across the whole document, not just sentence by sentence Finds missing acronym definitions and capitalization inconsistencies
English only No graphical interface	Depends on Microsoft Word Paid after the trial period
Downloadable app	Downloadable app
Open source	Closed source
License: BSD-3-Clause	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it 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.