Copperline

Overview

Written in Rust and licensed under GNU GPL v3 or later, Copperline models OCS, ECS and AGA machines with 68000 through 68060 CPUs. It covers Amiga models including the A1000, A500, A1200, A3000, A4000, CDTV and CD32, as well as expansion boards, hard disks and CD drives. Its m68k CPU core has a separate MIT license.

Copperline runs on Linux, macOS and Windows, and also has a browser version. It includes the AROS open-source Kickstart replacement, but some software requires an original Kickstart ROM. Supported disk-image formats are ADF, ADZ, single-file ZIP, DMS, extended ADF, IPF and SCP; high-density Amiga floppy images and sector-based PC/CrossDOS images are unsupported. That makes checking the requirements of a particular game or disk collection worthwhile before settling on Copperline.

The maker identifies Andrew Hutchings, known as LinuxJedi, and says he uses real Amigas as a reference for checking emulator behavior. Users can report issues or contribute fixes on GitHub, and discuss configurations, demos and Amiga hardware on Discord.

For a broader category comparison, see Amiga Emulators.

Key features

Netplay and RetroArch

Rollback netplay accommodates two players on desktop or in a browser. Desktop sessions can reach four players with the four-player adapter, with up to eight spectators. That range suits both browser-based sessions and larger desktop gatherings, though the four-player option depends on the adapter.

A libretro core brings Copperline into RetroArch, supporting A500, A1200 and CD32 software, WHDLoad, playlists, save states, four local controller ports and RetroArch netplay. RetroArch users can keep those workflows in a familiar frontend; users who do not use RetroArch can simply use Copperline directly.

Debugging and automation

The Debug workspace places registers, disassembly and memory beside the Amiga display, and can reverse-step from snapshots. That is a practical toolkit for inspecting program behavior rather than merely playing software. Scripted inputs and captures, repeatable test sessions, headless runs and a JSON-RPC control protocol give developers ways to automate testing. Documentation also covers debugging Amiga source code from Visual Studio Code.

Pricing

Copperline is free software under GNU GPL v3 or later, with a free plan and no paid plan to weigh against it. The trade-off is not a feature tier but setup compatibility: some software needs an original Kickstart ROM, and unsupported image formats will not work. The included AROS replacement is useful, but does not remove that requirement for every title.

Platforms

Copperline supports Linux, macOS, Windows and browser use. Linux AppImage users need a Vulkan driver, so that package is not a fit for a system without one. The macOS download is ad-hoc signed rather than notarized; macOS may require approval on first launch. These platform-specific steps are worth factoring in for anyone seeking a no-friction install.

Who it's for

Copperline is especially suited to Amiga developers, demo makers and technically minded players who value debugging, scripted sessions or netplay as much as emulation. RetroArch users also get a dedicated libretro route with local controller support. A player focused on a particular legacy disk should first confirm its format and Kickstart needs; the unsupported image types and occasional original-ROM requirement narrow its out-of-the-box reach.

Pros and cons

• Pro: Debugging combines registers, disassembly and memory with the display, plus reverse stepping from snapshots—useful for investigating software rather than treating emulation as a black box.
• Pro: Rollback play spans desktop and browser, with desktop support for four players using an adapter and up to eight spectators.
• Pro: Automation options include headless runs, scripted inputs and captures, repeatable sessions and JSON-RPC control.
• Con: Some titles require an original Kickstart ROM despite the included AROS replacement.
• Con: High-density Amiga floppy images and sector-based PC/CrossDOS images are unsupported.
• Con: Linux AppImage requires Vulkan, while macOS may ask users to approve the first launch because the download is not notarized.

Alternatives

vAmigaWeb is a free option for readers who want an emulator on Android or iOS as well as the web. Choose Amiberry instead if Android support matters, or if you want a free GPLv3 emulator across Android, Linux, macOS and Windows.

FS-UAE is another free, open-source Amiga emulator for Linux, macOS and Windows, with optional donations. Amigo — Amiga Emulator suits Apple-device users looking for a free app without ads or accounts; it requires users to bring their own Kickstart ROM and disks.

Choose vAmiga for a free macOS-only option, or Scripted Amiga Emulator (SAE) if you want a free web or API-based alternative. Amiga Forever is a paid alternative for readers who prefer a one-time purchase: its Value Edition costs 19.95 USD per once and includes a Windows installer, Workbench 1.3 and ROM versions 1.1, 1.2 and 1.3. Buddi is budgeting software, not an Amiga emulator.

Verdict

Choose Copperline if you want a free, broad-platform Amiga emulator that can serve development and automated testing as well as play, or if rollback netplay and RetroArch support are priorities. Its standout reason to choose it is the combination of serious debugging and automation with desktop and browser multiplayer. Look elsewhere if your software depends on unsupported disk images, or if you need an original Kickstart ROM bundled with the emulator.