A very fast STL file viewer design to load and render very high polygon models; showing 2 million triangles at 60+ FPS.
Publisher’s description
What is fstl?
fstl by fstl contributors is open-source Windows software. It is written in C++.
Installation and requirements
The publisher provides EXE (NSIS) installers for 64-bit Windows. Installation asks for administrator rights. A silent install is possible with the installer’s documented switches.
Popularity and file types
The source code on GitHub (fstl-app/fstl) has 599 stars. On Windows it registers 1 file type, including .stl.
Project description on GitHub: “A fast STL file viewer”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Documented silent install
Cons
- No native ARM64 build
- Installation needs administrator rights
- No update for more than a year
In short: fstl is an open-source Windows tool for 64-bit PCs. Updates have slowed down. Administrators can deploy it unattended.
Is fstl safe to download?
- The file is served by github.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
721DDF53A966E3CDE604E039F28AF3F7F86A099B585BCF5E30951C144AC96F17· Open the VirusTotal report for this hash - The link has not been checked yet
- 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
Security practices (OpenSSF Scorecard)
Automated checks of the fstl-app/fstl repository on GitHub by the Open Source Security Foundation, last run on October 19, 2026.
- No dangerous workflows10
- No binaries in the repository10
- Code review5
- Actively maintained0
- Restricted token permissions0
- Pinned dependencies0
- OpenSSF Best Practices badge0
- Security policy0
- Licence declared0
- Fuzzing0
- Signed releases0
- Branch protection0
- Static code analysis0
The score rates how the project is developed and released, not whether the program is safe to install. scorecard.dev
Recent versions
All 1 versions ›| Version | Date | Size | Files |
|---|---|---|---|
| 0.11.0Latest | January 22, 2025 | — | 64-bit EXE (NSIS) |
Install from the command line
Silent install ›winget install --id fstl.fstl -efstl-0.11.0-win64.exe /SRelated guide: How to use winget: install and update apps
Information
- Publisher
- fstl contributors
- Licence
- MIT
- Price
- Free
- Source code
- github.com/fstl-app/fstl
- Written in
- C++
- Requires
- Windows 11 / 10
- Architecture
- 64-bit
- Installer
- EXE (NSIS)
- Version
- 0.11.0
- Released
- January 22, 2025
- Added to the catalogue
- January 28, 2025
- Versions listed
- 1
- GitHub stars
- 599
- GitHub forks
- 121
- Website
- github.com
- winget ID
- fstl.fstl
File types it opens (1)
Ratings and reviews
No reviews yet. Be the first to rate it.
Frequently asked questions
Is fstl free?
Yes. fstl is open-source software under the MIT licence.
Is fstl safe to download?
The download comes from github.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 fstl 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 fstl be installed silently?
Yes. The silent install page lists the exact command for each installer.
Does fstl run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit version through emulation.