McOsu

Released Mar 2017

A free open-source circle-clicking rhythm game practice client for osu! beatmaps with Virtual Reality support. McOsu is developed separately from and has no direct affiliation with osu! or ppy Pty Ltd.

88% positive · 6,395 reviews

Not yet

Released, but still in active development

High confidence

Active Development

Not yet

Released, but still in active development

High confidence

Active Development

Where to get it

Free on Steam

Steam Free

Evaluation

McOsu is a free, open-source rhythm game practice client that has been continuously updated since its release on March 20, 2017. The developer (McKay) has maintained a steady stream of feature-bearing updates throughout the game's lifetime, with 28 feature patches among the 47 news posts on record. The update history shows a clear and sustained pattern: version 33 on January 16, 2022; version 33.01 on June 5, 2022; version 33.08 on January 3, 2024; version 33.09 on November 7, 2024; version 33.11 on April 22, 2025; version 33.12 on December 7, 2025; and version 33.14 on February 20, 2026 — approximately eight months before today (October 8, 2026). This establishes a consistent cadence of feature updates arriving roughly every few months to once or twice a year. The February 20, 2026 update (version 33.14) was a substantial one, upgrading the Windows build to a 64-bit DirectX 11 executable, upgrading the Linux renderer to OpenGL 3.3 core, adding an in-game console window, improving rendering performance, and fixing several bugs. This is well within the typical interval between updates for this project. The three DLC listings are simply donation tiers that have been available since launch and carry no bearing on content status. No developer statement has indicated that development is winding down or complete. The game's nature as a practice client that tracks the continuously evolving osu! ecosystem gives it an ongoing purpose that drives continued updates.

Evidence

Version 33.14 shipped with a major engine upgrade to 64-bit DirectX 11 on Windows, a new OpenGL 3.3 core renderer on Linux, an in-game console window, rendering performance improvements, and several bug fixes.

news post · Feb 20, 2026 source development ongoing

high

Version 33.12 shipped with updated star/pp algorithms, a new experimental mod, new song browser options, and bug fixes.

news post · Dec 7, 2025 source development ongoing

high

Content

3 of 3 released · no outstanding content

Released

McOsu - Donation - 1

Mar 2017

Released

McOsu - Donation - 3

Mar 2017

Media

Details

Developer

McKay

Publisher

McKay

Achievements

—

Platform

Windows, Linux

Controller

—

Steam Deck

Not rated

Players

Single-player

Rhythm Free to Play Music Anime VR Indie Difficult Great Soundtrack Psychological Horror 2D FPS

About this game

McOsu is developed separately from and has no direct affiliation with osu! or ppy Pty Ltd.

McOsu is NOT osu!

A free open-source circle-clicking rhythm game client for osu!(standard) beatmaps, with the main focus on making practicing easier and customizing gameplay.

It is primarily a practice client for getting better at the "official" game by having tools at your disposal that osu!(stable) does not provide for some reason, it's not supposed to be a perfect copy of osu! though it does get close enough where necessary.

If you have never played osu! before, then I do not recommend using this client (except for VR players + FPoSu players of course), because there are no gameplay tutorials to be found here (just google "osu!" and play the official game which is a lot more polished and has online rankings including multiplayer support etc.).

McOsu only supports osu!(standard) beatmaps, while diffs for other gamemodes like mania/taiko/ctb/etc. are simply invisible.

Features:

Unlimited Customizability (Options, Console Commands via SHIFT + F1)
Beatmap Overrides (Approach Rate, Circle Size, Overall Difficulty, HP Drain)
Speed/BPM Slider
Scrubbing and Quicksave/load (SHIFT and F6/F7, rebindable, jump to any point in time of a beatmap)
Experimental Mods (Wobble, Jigsaw, First Person, Playfield Flipping, Reverse Sliders, etc.)
Change mods and options while playing (F1 and CTRL + O)
Built-in pp counter (live stats overlay + ranking screen)
VR gamemode
First-Person 3D gamemode (FPoSu)
Steam Workshop support for skins
Infinite offline profiles with pp ranking
Customizable HP Drain + Notelock algorithms

Beatmaps

If you have osu!(stable) installed, then McOsu will load your beatmaps directly from the default osu!(stable) installation path, although custom paths are also possible
You can use McOsu without installing osu!(stable), it is not recommended though. A guide on manual beatmap management is available in the Steam Community Guides
Creating an official osu! account for downloading beatmaps is not required. You do not have to use the official osu! website to download beatmaps. Third party beatmap mirrors are available, just google for them

osu! VS McOsu

The intention of this game is neither to replace peppy's client, nor to split the community. McOsu was created partially out of frustration, because osu! is lacking many usability features vital to practicing effectively and efficiently. This is currently being rectified in the rewrite of osu! (called osu!lazer), which is an open-source project anyone can contribute to as well.

As a wise man once said, "plz enjoy game".

If you want, you can help out with McOsu development on Github, or just take a look at the source code, as this is an open-source project.