# OpenSpeedy: a Windows game speed modifier that hooks time functions in Ring 3 > OpenSpeedy is a GPL-3.0 Tauri desktop app that changes a running game's speed by hooking Windows timing APIs from user mode. It is Windows 10+ only, and the README documents no rollback path. **game1024/OpenSpeedy** — 🎮 An open-source game speed modifier. - Repository: https://github.com/game1024/OpenSpeedy - Website: https://game1024.github.io/OpenSpeedy/ - Stars: 17,933 · Forks: 1,302 - Language: TypeScript - License: GPL-3.0 - Published: 2026-09-21 · Updated: 2026-09-21 · Language: en - Canonical page: https://hysenlabs.com/projects/game1024-openspeedy ## What OpenSpeedy changes, and for whom OpenSpeedy is an open-source game speed modifier for Windows. The README describes it as "The Best Open-Source Game Speed Controller" and lists four features: quick speed adjustment, a modern UI, support for both x86 and x64 platform processes, and Ring-3 level hooking that does not tamper with the system kernel. The audience is narrow and specific. You need Windows 10 or later, and you need a game whose internal clock is driven by the Windows timing functions the project hooks. It is not a general-purpose process accelerator and it is not a cheat: nothing in the README claims memory editing, value scanning or network manipulation. The mechanism is timing interception, which is why the same tool can speed up a slow puzzle game and why it will do nothing at all to a title that reads its clock from a source the hook list does not cover. The x86 and x64 note matters more than it looks. A 32-bit game process needs the 32-bit side of the hook, and the README lists both as supported, so a single installation is meant to cover either bitness. ## The hook list is the whole architecture OpenSpeedy adjusts game speed by hooking Windows system time functions inside the target process. The README gives a partial table of those functions: Sleep and SetTimer from user32.dll, timeGetTime from winmm.dll, and GetTickCou (truncated in the README, presumably GetTickCount). That list explains both the capability and the ceiling. Sleep and SetTimer govern how long a thread waits and how a message-based timer fires. timeGetTime and GetTickCount report elapsed time. A game that paces its simulation through those calls will appear to run faster or slower once the return values and wait durations are scaled. A game that paces itself through a GPU fence, an audio callback, or a network round trip will not. The design choice worth naming is the Ring-3 constraint. The README states it explicitly: "No kernel intrusion." Hooking in user mode means no driver to install and no kernel component to sign, which keeps the deployment simple and keeps the blast radius inside the game process. The trade-off is reach. Anything the game reads from a kernel-side counter that user mode cannot intercept stays at normal speed, and the game may then run at two different rates at once. ## Installing OpenSpeedy with winget and applying your first speed change The README gives three installation routes. Winget is the first and the only one that is fully scriptable. The package name is openspeedy and the README shows the install and launch as two separate commands, with a note to open a new terminal before running it. ```powershell # Install command winget install openspeedy # Open a new terminal and run openspeedy openspeedy ``` The second route is a manual download from the Releases page. The third is Steam, which the README marks as optional and points at a Steam store listing. If you want the newest build, the release history shows 3.3.11 tagged on 2026-09-12, with 3.3.10 earlier the same day and 3.3.8 on 2026-08-04. Once the app is open, the README's usage section is four steps: launch OpenSpeedy, run the target game, select the game process and adjust the speed multiplier in the interface, and the change takes effect immediately. The README illustrates steps two and three with screenshots and step four with a comparison video, so the intended first run is: app first, game second, then pick the process from the list and move the multiplier. If you are building from source instead of installing, the README lists Node.js 18+, Rust, CMake and Visual Studio with the C++ desktop development workload as prerequisites, and gives one command: ```powershell npm run tauri dev ``` The repository layout matches a Tauri v2 project: src/ for the React front end, src-tauri/ for the Rust side, src-bridge/ for the bridge layer, and a package.json whose version field is 3.3.11, the same as the latest release tag. ## Where OpenSpeedy is the wrong tool The first limitation is the platform. The README's system requirements say Windows 10 or later, and the repository carries a Platform: Windows badge. There is no macOS, Linux, iOS or Android build documented anywhere in the README or the repository layout. If you arrived looking for a Mac or mobile version, the answer is that the project does not describe one. The second limitation is anti-cheat. OpenSpeedy hooks timing functions inside a running process from user mode. Any multiplayer title with server-side or kernel-side integrity checking is a bad candidate, and the README does not discuss this case at all. The absence is itself the signal: the documentation frames the tool around single-process speed adjustment and says nothing about detection, bans or supported online use. The third limitation is the hook list itself. Because the mechanism is a fixed set of Windows timing functions, a game that does not route its clock through those functions is unaffected. You can install OpenSpeedy, select the process, move the multiplier and observe nothing. The README does not explain how to diagnose that, and no per-process detach or rollback procedure is documented, so the practical recovery path is closing the application. Finally, the README's function table is truncated mid-row, so the full list of hooked functions is not something this article can state. Treat the four named functions as a floor, not the complete set. ## How OpenSpeedy differs from Cheat Engine and Special K The nearest well-known comparison is Cheat Engine. Cheat Engine attaches to a process and lets you scan and modify memory, including the variables a game uses to store elapsed time. OpenSpeedy does not scan memory. It intercepts the API calls that produce time values, which means you do not need to find the right address, and it also means you cannot touch anything that does not go through those APIs. Cheat Engine is broader and far more manual; OpenSpeedy is narrower and closer to a single slider. Special K is a different shape again. It is a game-modding framework that injects into a title and reworks rendering, frame pacing and input, and it is configured per game through an in-game overlay. OpenSpeedy is a standalone Tauri desktop app with a process picker and a multiplier, and the README presents it as a general controller rather than a per-title framework. If your goal is frame pacing and rendering fixes, Special K is aimed at that problem. If your goal is to make a slow game's simulation run faster, OpenSpeedy's hook list is the more direct route. The honest summary is that OpenSpeedy trades coverage for convenience. It will not do what a memory scanner does, and it will not do what a rendering injector does, but it also does not ask you to find an address or edit a per-game profile. ## Maintenance, licence and what a GPL-3.0 binary implies The repository is not archived, and the last push was on 2026-09-12. The release cadence visible in the release history is tight around that date: 3.3.11 on 2026-09-12, 3.3.10 on 2026-09-12, and 3.3.8 on 2026-08-04. That is a project currently receiving commits. The licence is GPL-3.0, stated in the repository and repeated on the README badge. This is the part that needs care rather than legal advice. GPL-3.0 is a copyleft licence: if you redistribute OpenSpeedy, or ship a modified version, the obligations attach to the whole distributed work. Bundling the binary into a closed-source product, or distributing a patched build without source, is the kind of use that runs into those obligations. Running it locally on your own machine is a different situation from redistributing it, and the two should not be conflated. Upgrade cost is low if you install through winget, since the install path is a single package name and the release tags move quickly. If you build from source, the prerequisites are Node.js 18+, Rust, CMake and Visual Studio with the C++ desktop workload, and the front end pulls a fairly heavy dependency set (React 19, MUI, Blueprint, antd, i18next) plus a set of Tauri v2 plugins for autostart, global shortcuts, the opener, OS info, shell, store and window. That is a real toolchain to keep current, and it is the main reason to prefer the packaged route unless you intend to modify the hooks. ## Conclusion Adopt OpenSpeedy if you are on Windows 10 or later, want a user-mode speed modifier for a single-player game, and are comfortable with a GPL-3.0 binary that hooks Sleep, SetTimer and timeGetTime in the target process. Do not adopt it for macOS, Linux, iOS or Android, for anti-cheat-protected multiplayer titles, or for anything where you need documented per-process detach behaviour. Before installing, read the README's function table against the game you have in mind and confirm whether the title you care about is one of the cases the project lists as unsupported. ## FAQ ### How do I change the speed of a game with OpenSpeedy? Launch OpenSpeedy first, then run the game, then select the game process in the OpenSpeedy interface and adjust the speed multiplier. The README states the change takes effect immediately. ### how to use openspeedy The README's usage section is four steps: launch OpenSpeedy, run the target game, select the game process, and adjust the speed multiplier in the interface. Installation is via winget, a manual download from the Releases page, or optionally Steam. ### Does OpenSpeedy work on macOS or Android? No. The README lists Windows 10 or later as the system requirement and the repository carries a Windows platform badge; no macOS, iOS or Android build is documented. ### What Windows functions does OpenSpeedy hook? The README names Sleep and SetTimer from user32.dll and timeGetTime from winmm.dll, plus a fourth entry beginning with GetTickCou that is truncated in the published table. The hooking is done at Ring-3 level rather than in the kernel. ### Is OpenSpeedy free and what licence does it use? It is open source under GPL-3.0, as stated in the repository and on the README licence badge. The source is available on GitHub and the packaged builds are distributed through winget, the Releases page and optionally Steam. ## Sources - [game1024/OpenSpeedy on GitHub](https://github.com/game1024/OpenSpeedy) - [License: GPL-3.0](https://github.com/game1024/OpenSpeedy/blob/master/LICENSE) - [Project website](https://game1024.github.io/OpenSpeedy/) - [README](https://github.com/game1024/OpenSpeedy/blob/master/README.md) - [Releases](https://github.com/game1024/OpenSpeedy/releases) --- Hysen Labs editorial analysis, written from the project's own repository and release notes. Cite the canonical page: https://hysenlabs.com/projects/game1024-openspeedy