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Mesen vs Missingno: catalog facts
Mesen	Missingno
Free Free and open source under the GPL.	Free Free and open source under the MIT licence.
Windows, macOS, Linux	Linux
Cycle-accurate emulation with one of the best debuggers in any emulator Covers several systems in a single application	Combines emulation with a debugger Supports more than one system
Accuracy costs more CPU than fast emulators The debugging feature set is overwhelming if you only want to play	Small project with few users Supported systems are not clearly listed in one place
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: MIT
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 September 22, 2026	Official website Full listing and sources Checked October 1, 2026

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