Viciious

6.4easy start · #11 of 30
in Commodore 64 Emulators

Free to practise onnot on record
Free trialnot on record
Well documentedyes
Runs where you worknot on record

Runs on Linux, Web.

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Viciious is ranked #11 of 30 in Commodore 64 emulators on The Geeks Club. It runs on Linux, Web.

Compared on Commodore 64 emulators

Free plan: Yes
Supported platforms: Web browser; Node.js terminal
Disk and tape formats: .t64, .d64, .tap, .prg, .sid, .json snapshots
Built-in debugger: Yes
Emulated C64 variants: PAL Commodore 64
Bundled software library: Yes

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The record

Product: Viciious is a JavaScript Commodore 64 emulator for web browsers and terminal emulators.
Purpose: The project says it was written for tinkering and playful exploration of Commodore 64 hardware and software.
Graphics: It emulates the VIC-II graphics chip and supports 320×200 graphics in 16 colors.
Audio: It emulates the SID synthesizer with three simultaneous voices, each with a nine-octave range.
Programming: It includes a BASIC programming environment and an inbuilt half-assembler for writing 6502 opcodes as inline JavaScript.
File loading: In the browser, users can drag and drop .t64, .d64, .tap, .prg, and .sid files into the window.
Visual tools: It offers real-time scopes that visualize machine activity, including sprite-generated pixels and device access to RAM.
Distribution: The emulator distribution is a self-contained HTML file that does not access the Internet and runs serverless.
Node.js: The emulator can be built as a Node.js bundle and run with a regular terminal emulator for input and output.
Emulation limits: It emulates a PAL Commodore 64 in real time but is not cycle-accurate, does not emulate a disk drive, and lacks some features such as sound filtering.
Compatibility: The project says compatibility is incomplete due to emulation limitations and bugs, and snapshot files from versions before v1.0.0 may not be interchangeable.
Mobile: It can run in real time on mobile, but the project says its user interface is unsuitable there.
License: The emulator code and UI assets were authored from scratch and placed in the public domain; the repository notes exceptions for bundled ROMs, tests, and demo programs.
File formats: The browser version accepts .t64, .d64, .tap, .prg and .sid files by drag and drop.

Where it ranks on The Geeks Club

Best Commodore 64 Emulators in 2026#11 of 30

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Sources

github.com/luxocrates/viciious· checked 2 Oct 2026