Casso review
A free Windows emulator with broad Apple II model, disk, cassette, and peripheral support.
Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
Casso brings several Apple II models together in a Windows desktop application, alongside an assembler and disk manager. It is aimed at people who want more than a basic emulator: it covers Apple ][, ][+, //e, //e Enhanced, and //c, and includes cassette and peripheral emulation. Solo users and small groups looking for a free, open-source tool may find its combination useful; it is not suited to users who need a non-Windows option.
Its media support is a particular strength. Casso loads and saves WOZ, DSK, DO, PO, NIB, and NB2 disk images, and can create blank disks in multiple formats. Cassette recordings can be loaded and saved, with WAV, AIFF, MP3, and FLAC among the supported input formats. The integrated 6502/65C02 assembler and command-line interface add tools for working with Apple II software, while controller support includes physical game controllers and keyboard-mapped joystick input. This breadth suits users who want emulator and development utilities in one application, though someone interested only in launching disk images may prefer a narrower tool.
Casso also emulates Disk II audio, Mockingboard, an ImageWriter II printer, and a Uthernet II network card, with adjustable CRT effects and monitor themes. It is distributed as an MSIX bundle or ZIP release and is licensed under MIT. The project is Windows-only, so users on other platforms should choose an alternative. For Windows users seeking model coverage, cassette handling, and emulated peripherals without a paid plan, Casso is a focused option; those who need cross-platform availability should look elsewhere.
Casso pros and cons
- Where it wins
- Emulates five Apple II models and supports six disk-image formats
- Loads and saves cassette audio, including WAV, AIFF, MP3, and FLAC input
- Adds Mockingboard, printer, network card, and controller emulation
- Where it doesn't
- Runs on Windows only
- Peripheral and media support may be more than users seeking a simple emulator need
- Does not offer AI features
Casso fact sheet, pricing and score →
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