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ClownMDEmu
What it is
ClownMDEmu is a free emulator for the Sega Mega Drive, also known as the Sega Genesis. Its self-contained emulation core is built as a portable library, and the maker links to a version that runs in a web browser. Users can also choose an official standalone frontend with debugging menus or an official libretro core for compatible hosts such as RetroArch and clownlibretro. The core can be compiled with CMake, but its repository notes that Git submodules need initialization before compiling. Its design targets C89, uses integer-only logic, and avoids dynamic memory and global state. State is kept in a relocatable structure without pointers, supporting save states and the possibility of multiple emulator instances. Audio output separates FM and PSG at native sample rates, while video is delivered one scanline at a time in indexed format. The maker says the emulator balances correctness and performance and may be more high-level than accuracy-focused alternatives. Some standard Mega Drive features remain incomplete, including areas of 68k exceptions and VDP rendering. It is free software under AGPLv3 or later.
For and against
For
- A browser version is available to try online.
- Official standalone and libretro frontends are available.
- The core supports save states.
- The software is free under AGPLv3 or later.
Against
- Some standard Mega Drive features remain unemulated.
- Compiling requires initializing Git submodules.
- The maker notes it may be more high-level than accuracy-focused alternatives.
The verdict
ClownMDEmu offers several ways to run a Mega Drive or Genesis emulation core, including browser and libretro options. Its documented incomplete emulation and build prerequisite are worth considering before choosing it.
Who it suits
ClownMDEmu may suit Sega Mega Drive or Genesis users who want a browser option, desktop frontend, or libretro-compatible setup. Developers can also use or build its emulation core as a library.
Plans and prices
ClownMDEmu
AGPLv3 or later · frontend required to run games
Read 15 Oct 2026 · github.com
On the record
- AppImage install
- The Linux AppImage is a single executable file that needs its executable bit enabled and does not require package installation.appimage.github.io · read 15 Oct 2026
- Apple platform inclusion
- The Apple RetroArch listing includes ClownMDEmu as a Sega MD/CD core and supports Mac, iPhone, iPad and Apple TV.apps.apple.com · read 15 Oct 2026
- Audio and video output
- The core outputs FM and PSG audio separately at native sample rates and video one scanline at a time in indexed format.github.com · read 2 Oct 2026
- Browser version
- The standalone frontend README links to a browser version at clownmdemu.clownacy.com.github.com · read 15 Oct 2026
- Build
- The core can be built using CMake, and its repository notes that Git submodules must be initialized before compiling.github.com · read 2 Oct 2026
- Build system
- CMake is supported, and compilation requires initializing the repository's Git submodules.github.com · read 15 Oct 2026
- Community history
- The Mega Drive Developers Collective thread records the project beginning as an incomplete emulator in September 2021 and being released early because feature completeness was considered open-ended.board.mddc.dev · read 15 Oct 2026
- Core design
- The repository contains a self-contained emulation core designed for portability and implemented as a library.github.com · read 2 Oct 2026
- Core language
- The emulation core targets C89 so it can compile with a wide range of compilers.github.com · read 15 Oct 2026
- Debugger
- The standalone frontend includes debugging menus intended for emulator and homebrew work.github.com · read 15 Oct 2026
- Frontend language
- The reference standalone frontend is written in C++20 and uses SDL3 and Dear ImGui.github.com · read 15 Oct 2026
- Incomplete emulation
- The maker notes that some standard Mega Drive features remain unemulated; the TODO lists incomplete 68k exceptions and unimplemented reset instruction and VDP rendering features.github.com · read 2 Oct 2026
- Independent description
- EmuNations describes the emulator as active, portable across Windows, Linux and browser use, and equipped with debugging tools.emunations.com · read 15 Oct 2026
- Independent feature report
- EmuNations reports Motorola 68000 instruction durations, save data, debugger support and accurate window-plane emulation.emunations.com · read 15 Oct 2026
- Integer-only design
- The core avoids floating-point arithmetic for emulation logic, with limited build-time exceptions for generated constants.github.com · read 15 Oct 2026
- Libretro capabilities
- The core supports saves, save states, rewind, netplay, cheats, remapping, softpatching and subsystem loading in RetroArch.docs.libretro.com · read 15 Oct 2026
- Libretro integration
- An official frontend exposes ClownMDEmu as a libretro core for use with libretro implementations such as RetroArch and clownlibretro.github.com · read 2 Oct 2026
- Licence
- ClownMDEmu is free software under the GNU AGPLv3 or any later version.github.com · read 15 Oct 2026