Casso
Casso: A free Windows emulator with broad Apple II model, disk, cassette, and peripheral support. Ranked #8 of 20 in Apple II Emulators by our editors (7.9/10); pricing: Free plan; best for windows users wanting hardware and cassette emulation.
At a glance
- Editor score7.9 / 10
- PricingFree plan
- Best forWindows users wanting hardware and cassette emulation
- Free planYes
- Paid fromFree
- Apple II model coverageMulti-model
- Facts checked14 Nov 2026
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
Our verdict on Casso
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.
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Casso pricing
Casso fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Apple II model coverage | Multi-model |
| Host platform | Windows |
| Disk image formats | WOZ, DSK, DO, PO, NIB, NB2 |
| Built-in debugger | Not verified |
| Save states | Not verified |
| Joystick support | Yes |
| Deployment | Desktop |
| Platforms | Windows |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 14 Nov 2026 |
Alternatives to Casso
- OpenEmuA polished Mac library for classic games, but not a dedicated Apple II emulator.7.9
- AvidemuxA free, open-source tool for basic video processing—not Apple II emulation.7.9
- AppleWinA free desktop emulator with Apple II models, peripherals, video modes, and a debugger.7.9
Casso vs the competition
Compare Casso with any tool side by side →
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Featured on iTechGuides
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Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
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