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KeyManager vs win-acme: catalog facts
KeyManager	win-acme
Free Free download for Windows, macOS and Linux.	Free Free and open source under the Apache 2.0 licence.
Windows, macOS, Linux	Windows, Command line
Generates keys and CSRs and merges issued certificates AES-256 encrypted private key storage	Simple guided setup for IIS sites Automatic renewal via a scheduled task
Website and documentation are in Chinese Proprietary software tied to a certificate vendor	Windows only Advanced scenarios need familiarity with ACME validation
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: Apache-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
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.