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USP - ZX Spectrum Emulator vs Fuse: catalog facts
USP - ZX Spectrum Emulator	Fuse
Best for: Retro computing fans playing ZX Spectrum software on Android	Best for: ZX Spectrum players who want a well-established accurate emulator
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source.
Android	Windows, macOS, Linux
Wide file format support including tzx, trd and rzx Emulates Pentagon 128K with AY/YM sound and Beta Disk All 3 strengths for USP - ZX Spectrum Emulator Wide file format support including tzx, trd and rzx Emulates Pentagon 128K with AY/YM sound and Beta Disk Snapshots and replays	Accurate emulation of many Spectrum models Accelerated .tzx tape loading All 4 strengths for Fuse Accurate emulation of many Spectrum models Accelerated .tzx tape loading RZX recording with competition mode Emulates printers and many peripherals
Emulates the ZX Spectrum family only Sparse project homepage and documentation	Spectrum family only Plain interface compared with newer emulators
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Offline features available
Official website Full listing and sources Sources for USP - ZX Spectrum Emulator bitbucket.org/djdron/unrealspeccyp f-droid.org/packages/app.usp Catalog checked October 2, 2026	Official website Full listing and sources Sources for Fuse fuse-emulator.sourceforge.net Catalog checked September 23, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.