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APNGb vs apngasm: catalog facts
APNGb	apngasm
Free The app is listed as freeware.	Free Free and open source under the zlib licence.
macOS	Windows, macOS, Linux, Command line
Assembles and extracts APNG frames Can optimize and compress assembled animations	Both assembles and disassembles APNG files Available as a CLI and as a library
Available for macOS only	Command line only, no graphical interface Development has been quiet since late 2023
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: Zlib
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 2, 2026

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