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apngasm vs APNGb: catalog facts
apngasm	APNGb
Free Free and open source under the zlib licence.	Free The app is listed as freeware.
Windows, macOS, Linux, Command line	macOS
Both assembles and disassembles APNG files Available as a CLI and as a library	Assembles and extracts APNG frames Can optimize and compress assembled animations
Command line only, no graphical interface Development has been quiet since late 2023	Available for macOS only
Downloadable app	Downloadable app
Open source	Closed source
License: Zlib	License not stated
No account needed	Not stated if an account is needed
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 8, 2026

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