LeanFPS is a free game optimizer for Windows 10 and 11. It detects your game, applies per-genre tweaks, measures FPS and 1% lows, and undoes every change.
Publisher’s description
What is LeanFPS?
LeanFPS by Jamailar is open-source Windows software in the pc games category.
Installation and requirements
The publisher provides EXE (Inno Setup) installers for 64-bit Windows. The main installer is 5.9 MB. Installation asks for administrator rights. A silent install is possible with the installer’s documented switches.
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Documented silent install
- Updated in the last two months
- Small download (5.9 MB)
Cons
- No native ARM64 build
- Installation needs administrator rights
In short: LeanFPS is an open-source pc game tool for 64-bit PCs. Administrators can deploy it unattended.
Is LeanFPS safe to download?
- The file is served by dl.leanfps.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
5FFC79BF5434679B08EE869C7980F0A80A6F9B574BDCF9C14ED42389AFB17F50· Open the VirusTotal report for this hash - The link answered when we last checked it (November 12, 2026)
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 1 versions ›| Version | Date | Size | Files |
|---|---|---|---|
| 0.1.147Latest | October 10, 2026 | 5.9 MB | 64-bit EXE (Inno Setup) |
Install from the command line
Silent install ›winget install --id Jamailar.LeanFPS -eLeanFPS-Setup-0.1.147.exe /VERYSILENT /SUPPRESSMSGBOXES /NORESTART /SP-Related guide: How to use winget: install and update apps
Information
- Publisher
- Jamailar
- Category
- PC games
- Licence
- MIT
- Price
- Free
- Requires
- Windows 11 / 10
- Architecture
- 64-bit
- Installer
- EXE (Inno Setup)
- Version
- 0.1.147
- Released
- October 10, 2026
- Added to the catalogue
- November 10, 2026
- Versions listed
- 1
- Website
- leanfps.com
- winget ID
- Jamailar.LeanFPS
Ratings and reviews
No reviews yet. Be the first to rate it.
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Frequently asked questions
Is LeanFPS free?
Yes. LeanFPS is open-source software under the MIT licence.
Is LeanFPS safe to download?
The download comes from dl.leanfps.com, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install LeanFPS with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Can LeanFPS be installed silently?
Yes. The silent install page lists the exact command for each installer.
Does LeanFPS run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit version through emulation.
What are alternatives to LeanFPS?
RetroArch, OpenTTD, Steam, PPSSPP and ScummVM. The alternatives page compares them.
