Rule of Three calculator for direct and inverse proportions
Publisher’s description
What is FRO3?
FRO3 is an open-source program for Windows from Daniel Batista Bueno. It is written in Dart.
Installation and requirements
Official installers exist for 64-bit as EXE (Inno Setup). The installer supports unattended (silent) installation.
Updates and version history
The current version is 1.0.2, released on August 5, 2026. 2 versions are listed since July 17, 2026, each with links to its own installer files.
Project description on GitHub: “A modern, fast, and cross-platform Rule of Three calculator built using Flutter. This application features a high-fidelity interface adhering to Material 3 design principles, offering seamless responsive behavior, dynamic theming, and multi-language support.”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Documented silent install
Cons
- No native ARM64 build
In short: FRO3 is an open-source Windows tool for 64-bit PCs. Administrators can deploy it unattended.
Is FRO3 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:
FC63E0A9019D78A2055530FF58C57FED35CC1F4257E2BDA5AB360410C3EA58D3· 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
Recent versions
All 2 versions ›| Version | Date | Size | Files |
|---|---|---|---|
| 1.0.2Latest | August 5, 2026 | — | 64-bit EXE (Inno Setup) |
| 1.0.1 | July 17, 2026 | — | 64-bit EXE (Inno Setup) |
Install from the command line
Silent install ›winget install --id bbatistadaniel.fro3 -eFRO3_1.0.2_x64.exe /VERYSILENT /SUPPRESSMSGBOXES /NORESTART /SP-Related guide: How to use winget: install and update apps
Information
- Publisher
- Daniel Batista Bueno
- Licence
- GNU General Public License v3.0
- Price
- Free
- Source code
- github.com/bbatistadaniel/fro3
- Written in
- Dart
- Requires
- Windows 11 / 10
- Architecture
- 64-bit
- Installer
- EXE (Inno Setup)
- Version
- 1.0.2
- Released
- August 5, 2026
- Added to the catalogue
- July 17, 2026
- Versions listed
- 2
- winget ID
- bbatistadaniel.fro3
Ratings and reviews
No reviews yet. Be the first to rate it.
Frequently asked questions
Is FRO3 free?
Yes. FRO3 is open-source software under the GNU General Public License v3.0 licence.
Is FRO3 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 FRO3 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 FRO3 be installed silently?
Yes. The silent install page lists the exact command for each installer.
Does FRO3 run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit version through emulation.
Where can I download an older version of FRO3?
The versions page lists all 2 versions with links to their official installer files, back to July 17, 2026.