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OpenEmu vs Nestopia (Richard Bannister): catalog facts
OpenEmu	Nestopia (Richard Bannister)
Free The open-source application is available without a license fee.	Free Free download; the optional Emulator Enhancer add-on is shareware.
macOS	macOS
Native Mac library interface with artwork and metadata handled for you One controller configuration applies across every emulated system	Cycle-exact NES emulation for timing-sensitive games Supports 201 mappers and the Famicom Disk System
macOS only Core updates depend on the OpenEmu team packaging them	Gamepad and full screen support require the paid Emulator Enhancer add-on macOS only
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
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 2, 2026

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