Steam app 607260 · updated 12 Sep 2026, 19:45 UTC
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.
719 hourly samples, with the daily peak drawn over them. Weekends are shaded.
115 months, March 2017 to September 2026. The highest number of people in the game at once, each month, on a time axis -- a gap in the record stays a gap.
The highest number of people in the game at once, each month. Four, because four is as far back as the source keeps anything finer than one figure a month.
31 days, each one the highest figure that day. The source keeps no hourly detail this far back. Weekends are shaded.
31 days as the curve, each the highest figure that day. Behind it, 436 hourly samples from 13 Aug, which is as far back as the source keeps every hour. Weekends are shaded.
12 days as the curve, each the highest figure that day. Behind it, 283 hourly samples. Each dip is a night. Weekends are shaded.
McOsu was released on 20 Mar, 2017.
| Language | Full audio |
|---|---|
| English |
A blank audio cell means full audio was not marked in the returned language list.
48 developer announcements, Mar 2017 to Feb 2026 · times in UTC
- \ Starting with this version (33.14), the legacy 32-bit OpenGL build will only be used for VR- \ The Steam launch option "Play on Desktop" has been updated to use the 64-bit DirectX11 build for all players- \ Executable names have not…
Patch notes- Updated pp algorithm to better handle ScoreV2 cases for ScoreV1-based misscount estimation (thanks to @Givikap120!) - Updated pp algorithm to disable ScoreV1-based misscount estimation for all older ScoreV2 McOsu scores (discrepancy with…
Patch notes- For more info on the star/pp changes in this update see https://osu.ppy.sh/home/news/2025-10-29-performance-points-star-rating-updates - Updated star + pp algorithms to match current lazer implementation aka 20251007 (20) (thanks to…
Patch notes- For more info on the star/pp changes in this update see https://osu.ppy.sh/home/news/2025-03-06-performance-points-star-rating-updates - Updated star + pp algorithms to match current lazer implementation aka 20250306 (19) (thanks to…
Patch notes- Updated osu!stable database loader to support new 20250108 format (see https://osu.ppy.sh/home/changelog/stable40/20250108.3)
Patch notes- For more info on the star/pp changes in this update see https://osu.ppy.sh/home/news/2024-10-28-performance-points-star-rating-updates - Updated star + pp algorithms to match current lazer implementation aka CSR aka Combo Scaling Removal…
Patch notes- Added hittable dim (hitobjects outside even the miss-range are dimmed, see https://github.com/ppy/osu/pull/20572) - Added Options > Gameplay > HUD > "Draw HitErrorBar UR" (Unstable Rate text display above hiterrorbar, enabled by default)…
Patch notes- Reenabled IME support to fix blocking keyboard language switching hotkeys (add "-noime" launch arg to get the old behavior back in case of problems) - Improved console autocomplete - Fixed pie progressbar fill being invisible under…
Patch notes- Added option "\ RawInputBuffer" (Options > Input > Mouse) - Added ConVars (1): osu_mod_random_seed, osu_hud_statistics_*_offset_x/y, osu_slider_max_ticks - Added ConVars (2): osu_background_color_r/g/b - Updated mod selection screen to…
Patch notes- Updated star + pp algorithms to match current lazer implementation aka 20220902 (16) (thanks to @Khangaroo!) - Fixed visual vs scoring slider end check in new lazer star calc (@Khangaroo) - Added option "Disable osu!lazer star/pp…
Patch notes- Added new experimental mod "Half Timing Window" - Added "Quick Seek" key bindings (jump +-5 seconds, default LEFT/RIGHT arrow keys) - Added hitobject type percentage support to songbrowser search (e.g. "sliders>80%") - Added ConVars (1)…
Patch notes- Windows: Added support for mixed-DPI-scaling-multi-monitor setups (automatic detection based on which monitor the game is on) - Windows: Added support for key binding all remaining mouse buttons (all mouse buttons can now be bound to key…
Patch notes- Linux: Switched to SDL backend (mostly for Steam Deck multitouch support) - FPoSu: Added cursor trail support (can be disabled in Options > Skin > "Draw Cursor Trail", or fposu_draw_cursor_trail) - Added new experimental mod "Approach…
Patch notes- Added collection management support (Add/Delete/Set/Unset collections, right-click context menu on beatmap buttons) - FPoSu: Added new experimental mod "Strafing" - Added gamemode selection button to songbrowser (no, skins abusing this as…
Patch notes- Initial rewrite of songbrowser and entire internal database class architecture (not fully finished yet) - Songbrowser can now handle individual diff buttons and/or split from their parent beatmap/set button - Collections now correctly…
Patch notes- Added option "Inactive" (Options > Audio > Volume) - Added hitresult fadein + scale wobble animations (previously became visible instantly as is) - Added ConVars (1): osu_hitresult_fadein_duration, osu_hitresult_fadeout_start_time…
Patch notes- Added 2 new notelock algorithms: McOsu, osu!lazer 2020 (Karoo13's algorithm) - Added option "Select Notelock" (Options > Gameplay > Mechanics) - Added support for ranking-perfect (skin element for full combo on ranking screen) - Added…
Patch notes- Added HP drain support - Added 4 different HP drain algorithms: None, VR, osu!stable, osu!lazer - Added option "Select HP Drain" (Options > Gameplay > Mechanics) - Added geki/katu combo finisher (scoring, skin elements, health) - Added…
Patch notes- Added searching by beatmap ID + beatmap set ID - Added CTRL + V support to songbrowser search (paste clipboard) - Added speed display to score buttons - Added support for sliderslide sound - Added Touch Device mod (allows simulating pp…
Patch notes- Added button "Random Skin" (Options > Skin) - Added option "SHIFT + TAB toggles everything" (Options > Gameplay > HUD) - Added ConVars (1): osu_mod_random_circle/slider/spinner_offset_x/y_percent…
Patch notes- Improved osu collection.db loading speed - Fixed new osu database format breaking loading (see here) - Added upper osu database version loading limit - Added "Sort By Misses" to score sorting options - Added ConVars…
Patch notes- Added proper support for HiDPI displays (scaling) - Added option "UI Scale" (Options > Graphics > UI Scaling) - Added option "DPI Scaling" (Options > Graphics > UI Scaling) - Added context menu for deleting scores in "Top Ranks" screen…
Patch noteshttps://steamcdn-a.akamaihd.net/steamcommunity/public/images/clans/28192742/1dcc8b519ed953ab259c731a3541b5db02f7213b.png - Added Steam Workshop support (for skins) - Added option "Cursor ripples" (Options > Input > Mouse) - Added skinning…
Patch notes- Added lock buttons to AR/OD override sliders (force constant AR/OD even with speed multiplier) - Added reset buttons to all options settings - Added ConVars: osu_slider_reverse_arrow_alpha_multiplier, snd_speed_compensate_pitch - Fixed…
Patch notes- Merged FPoSu (Options > FPoSu) - FPoSu is a real 3D first person gamemode, contrary to the 2D experimental mod "First Person" - Thanks to Colin Brook (aka SnakeModule on GitHub) - FPoSu: Moved "Playfield Edge Distance" from Mod Selector…
Patch notes- NOTE: New stars/pp are accurate with an average delta of ~0.1% or ~0.003 stars, except for very few Aspire/2B maps with ~15% - Updated star algorithm to respect slider curves/repeats/ticks/tails and stacking (7) - Updated star algorithm…
Patch notesDownload: https://github.com/McKay42/McOsu-NX https://steamcdn-a.akamaihd.net/steamcommunity/public/images/clans/28192742/4659d87aa83f8ee0a66b18ec2d8a7e9edf8c4eeb.png…
McKay- Added "Top Ranks" / "Best Performance" screen showing all weighted scores (Songbrowser > User > Top Ranks) - Added option "Include Relax/Autopilot for total weighted pp/acc" (Options > General > Player (Name)) - Added option "Show pp…
Patch notes- Added rich presence support (Discord + Steam) - Added user profile info + switcher to songbrowser (total weighted pp/acc/lv) - Added key overlay - Added new experimental mod "Reverse Sliders" - Added mouse sidebutton support (mouse4…
Patch notes- Added local scores - Added osu! scores.db support (read-only) - Allow options menu anywhere (CTRL + O) - VR: Added cursortrails, New cursor - VR: Allow 0 meters approach distance - VR: Added option "Draw VR Approach Circles" (Options >…
McKay+2018-02-14: - Reworked Mouse/Tablet input handling - Fixed cursor jerking to bottom right corner when accidentally wiggling mouse while using tablet - Fixed letterboxing cursor behavior (clipping/confining) - Fixed desynced slider ticks…
McKay+2018-05-25: - Updated pp algorithm (2), see https://github.com/ppy/osu-performance/pull/47 - Updated pp algorithm (1), see https://github.com/ppy/osu-performance/pull/42 - Removed number keys being hardcoded keybinds for pause menu (1,2,3)…
McKayLots of tiny bugfixes and improvements happened between 28.91 and 28.97, here is a summary of the bigger changes/additions: - Star ratings in songbrowser for everyone (even without osu!.db database) - Added smooth cursortrail support…
McKayLots of tiny bugfixes and improvements happened between 28.91 and 28.97, here is a summary of the bigger changes/additions: - Star ratings in songbrowser for everyone (even without osu!.db database) - Added smooth cursortrail support…
Patch notes- Thanks to Francesco149 for letting me use his implementation of Tom94's pp algorithm! ( https://github.com/Francesco149/oppai/ ) - Added pp to ranking/results screen - Added live pp counter to statistics overlay (Options > HUD > "Draw…
McKay- Thanks to Francesco149 for letting me use his implementation of Tom94's pp algorithm! ( https://github.com/Francesco149/oppai/ ) - Added pp to ranking/results screen - Added live pp counter to statistics overlay (Options > HUD > "Draw…
Patch notes- Major performance optimizations - Switched score calculation to 64-bit. The maximum score is now 18446744073709551615 - Fixed spinning spinners after dying in VR - Fixed Auto failing impossible spinners
McKay- Major performance optimizations - Switched score calculation to 64-bit. The maximum score is now 18446744073709551615 - Fixed spinning spinners after dying in VR - Fixed Auto failing impossible spinners
Patch notes- Added "OS TabletPC Support", use it if tablet clicks are not working properly (Options > Input > Tablet) - Fixed being able to spin spinners with relax while paused
McKay- Added "OS TabletPC Support", use it if tablet clicks are not working properly (Options > Input > Tablet) - Fixed being able to spin spinners with relax while paused
Patch notes- Added support for animated skins (please report bugs and broken skins in the comments/forum) - Added active mods to ranking/results screen - Added avg error to Unstable Rate tooltip - Added support for HitCirclePrefix in skin.ini…
McKay- Added support for animated skins (please report bugs and broken skins in the comments/forum) - Added active mods to ranking/results screen - Added avg error to Unstable Rate tooltip - Added support for HitCirclePrefix in skin.ini…
Patch notes- Added preliminary primitive sorting options to songbrowser (Artist, BPM, Creator, Date Added, Difficulty, Length, Title) - Slightly improved right-click absolute scrolling range in songbrowser - Fixed negative slider durations causing…
McKay- Added preliminary primitive sorting options to songbrowser (Artist, BPM, Creator, Date Added, Difficulty, Length, Title) - Slightly improved right-click absolute scrolling range in songbrowser - Fixed negative slider durations causing…
Patch notes- Added VR head model to spectator mode - Added ConVars vr_head_rendermodel_name, vr_head_rendermodel_scale, vr_head_rendermodel_brightness - Added option to draw 300s (bottom of Options, last one) - Made slider parsing & curve generation…
McKay- Added VR head model to spectator mode - Added ConVars vr_head_rendermodel_name, vr_head_rendermodel_scale, vr_head_rendermodel_brightness - Added option to draw 300s (bottom of Options, last one) - Made slider parsing & curve generation…
Patch notes- Fixed being able to continue spinning spinners while paused - Fixed random invisible songbuttons in songbrowser on ultrawide resolutions (e.g. 21:9)
McKay- Fixed being able to continue spinning spinners while paused - Fixed random invisible songbuttons in songbrowser on ultrawide resolutions (e.g. 21:9)
Patch notesEverything Steam lists as add-on content for this game, newest first. Prices are left out on purpose: the store answers this page in one currency and it is not the reader's.
| Name | Platforms | Released |
|---|---|---|
| McOsu - Donation - 5 | WindowsLinux | 20 Mar 2017 |
| McOsu - Donation - 3 | WindowsLinux | 20 Mar 2017 |
| McOsu - Donation - 1 | WindowsLinux | 20 Mar 2017 |
What Steam runs, and with what. Straight from the app configuration.
| Description | Executable | Arguments | Platform | |
|---|---|---|---|---|
| Launch | McEngine.exe | windows | ||
| on Desktop | McEngine_dx11.exe | -novr | windows | |
| on Desktop | McEngine | -novr | linux 64 | |
| on Desktop | McEngine | -novr | macos 64 |
It runs on public data and somebody's spare time.
![Gavin G - Reach Out [Cherry Blossom's Insane]](https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/256681175/movie.293x165.jpg?t=1490033936)
https://paypal.me/KintaroPalPay[email protected]0x4d559C765AA8BFe336E36d5b76024926767eD38dTJtctWU9uetJaTBoSybd1RErW7n9duTKVG