game1024/openspeedy

Analysis updated 2026-06-24

★ 15,860C++Audience · generalComplexity · 3/5Setup · easy

Mindmap

mindmap
  root((OpenSpeedy))
    Inputs
      Target game process
      Speed multiplier
    Outputs
      Faster or slower game time
    Use Cases
      Speed through grindy single-player loops
      Study time hooks on Windows
      Slow down a game for testing
    Tech Stack
      C++
      Qt
      Windows API
    Caveats
      Avoid online anti-cheat games

mindmap root((OpenSpeedy)) Inputs Target game process Speed multiplier Outputs Faster or slower game time Use Cases Speed through grindy single-player loops Study time hooks on Windows Slow down a game for testing Tech Stack C++ Qt Windows API Caveats Avoid online anti-cheat games

Click or tap to explore — scroll the page freely

What do people build with it?

USE CASE 1

Speed up a slow single-player game to skip grind

USE CASE 2

Slow a game down to study its physics or animation

USE CASE 3

Learn how to hook Windows time APIs from a C++ Qt app

What is it built with?

C++QtWindows

How does it compare?

	game1024/openspeedy	imputnet/helium	wolfpld/tracy
Stars	15,860	15,866	15,942
Language	C++	C++	C++
Setup difficulty	easy	easy	hard
Complexity	3/5	4/5	4/5
Audience	general	general	developer

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · easy Time to first run · 5min

Windows 10 or later only, using it on online games with anti-cheat can ban your account.

In plain English

OpenSpeedy is a free, open-source tool for Windows that lets you change the speed at which a game runs. You pick a game that's already running, set a speed multiplier in the OpenSpeedy interface, and the effect kicks in immediately, making the game move faster or slower than normal. It works by intercepting ("hooking") the time-related functions that Windows and games use to measure elapsed time, effectively tricking the game into thinking time is passing faster or slower. This happens at the application level rather than by modifying the operating system itself, which means it doesn't touch system files. It supports both 32-bit and 64-bit games and requires Windows 10 or later. The tool is built in C++ using the Qt framework for its interface. You can install it via winget (Windows' built-in package manager) or download it manually from the releases page. Important caveats stated in the README: this tool is intended for learning and research purposes only. Online games with anti-cheat systems may ban your account if you use it. Speeding up a game too much can cause the physics engine to break or crash. The authors specifically say it is not recommended for competitive online games.

Copy-paste prompts

Prompt 1

Install OpenSpeedy via winget and walk me through changing the speed of an offline game I have running

Prompt 2

Read the OpenSpeedy source and explain which Windows time APIs it hooks to alter game speed

Prompt 3

Help me build OpenSpeedy from source with Qt on Windows 11

Prompt 4

Explain why using OpenSpeedy with an online anti-cheat game can get my account banned

Frequently asked questions

What is openspeedy?

A free Windows tool that hooks time functions to speed up or slow down a running game, intended for single-player research, not competitive online play.

What language is openspeedy written in?

Mainly C++. The stack also includes C++, Qt, Windows.

How hard is openspeedy to set up?

Setup difficulty is rated easy, with roughly 5min to a first successful run.

Who is openspeedy for?

Mainly general.

Open on GitHub → Explain another repo

This repo across BitVibe Labs

Scan in gitsafehub Deploy in gitdeployhub game1024 on gitmyhub

Verify against the repo before relying on details.