FlaUI
FlaUI is a .NET library for automating UI testing of Windows applications (WinForms, WPF, Win32, Store Apps). It wraps Microsoft's native UI Automation APIs (UIA2 and UIA3) and lets developers choose which version to use based on their target application type.
Key facts
Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.
| Field | Value |
|---|---|
| Repository | FlaUI/FlaUI |
| Owner | FlaUI |
| Primary language | C# |
| License | MIT — OSI-approved |
| Stars | 3k |
| Forks | 439 |
| Open issues | 251 |
| Latest release | v5.0.0 (2025-02-25) |
| Last updated | 2026-06-17 |
| Source | https://github.com/FlaUI/FlaUI |
What FlaUI is
FlaUI provides a clean, modern C# wrapper around Microsoft's UI Automation libraries (MSAA, UIA2, UIA3), allowing programmatic interaction with Windows UI elements. It abstracts platform differences while exposing native objects for advanced use cases, and supports both legacy UIA2 (better for WinForms) and modern UIA3 (better for WPF/Store Apps).
Get the FlaUI source
Clone the repository and explore it locally.
git clone https://github.com/FlaUI/FlaUI.gitcd FlaUI# follow the project's README for install & configurationNeed it deployed, integrated, or customized instead? DEV.co ships production installs.
Best use cases
Implementation considerations
- Choose between UIA2 (NuGet: FlaUI.UIA2) or UIA3 (FlaUI.UIA3) at project setup based on target application type; migration between versions is possible but requires refactoring.
- Requires .NET framework; verify target application and hosting environment support Windows UI Automation APIs and necessary OS versions.
- 251 open issues indicate active backlog; prioritize issue review for your use case before committing to critical automation paths.
- Entry point pattern (Application → MainWindow → descendant elements) requires understanding application UI hierarchy and element identification strategies.
- Native object exposure allows workarounds for edge cases but adds complexity; document fallback strategies for framework gaps.
When to avoid it — and what to weigh
- Cross-Platform GUI Testing Required — FlaUI only supports Windows (Win32, WinForms, WPF, Store Apps). For macOS, Linux, or web-based cross-platform testing, alternative solutions are necessary.
- Enterprise Commercial Support Critical — This is a community-driven open-source project with no commercial support model. Organizations requiring vendor SLAs or guaranteed incident response should evaluate commercial alternatives like TestComplete or Ranorex.
- Heavy Reliance on Web UI Automation — FlaUI targets Windows native applications. Web application testing is not a primary use case; Selenium, Playwright, or Cypress are more appropriate.
- Minimal Technical Resources Available — While community chat exists, adoption numbers and availability of external consultants are unknown. Teams requiring extensive third-party training or support may face delays.
License & commercial use
Licensed under the MIT License, a permissive OSI-approved license allowing modification, redistribution, and private/commercial use with minimal restrictions (retain license notice).
MIT License permits commercial use, including in closed-source products, without requiring source disclosure or royalties. However, no commercial support, indemnification, or liability warranties are provided by the project. Commercial users should review the license terms and assess risk independently.
DEV.co evaluation signals
Editorial assessment — not user reviews. Directional, with an explicit confidence level.
| Signal | Assessment |
|---|---|
| Maintenance | Active |
| Documentation | Adequate |
| License clarity | Clear |
| Deployment complexity | Low |
| DEV.co fit | Good |
| Assessment confidence | High |
FlaUI provides UI automation capabilities and does not implement cryptographic, authentication, or data protection features. Security considerations are application-dependent: ensure test scripts do not hard-code sensitive credentials, restrict test environment access, and sanitize automation logs. No audit trail or access control mechanisms in the library itself.
Alternatives to consider
TestStack.White
Community-driven, similar Microsoft UI Automation wrapper, but older codebase with weaker UIA3 support and UIAComWrapper dependency; FlaUI claims cleaner architecture and better modern OS support.
TestComplete (Ranorex, CodedUI)
Commercial solutions with integrated recording, cross-framework support, vendor SLAs, and advanced features; appropriate for enterprises requiring support but costlier and vendor lock-in risk.
Selenium / Playwright (web focus)
Web application automation; not suitable for native Windows app testing but necessary for hybrid or web-heavy test suites.
Build on FlaUI with DEV.co software developers
FlaUI is a strong choice for teams building custom test automation frameworks on Windows. Review the 251 open issues, assess UIA2 vs. UIA3 compatibility, and verify community support meets your risk tolerance before adoption.
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FlaUI FAQ
Should I use UIA2 or UIA3?
Is FlaUI suitable for CI/CD pipelines?
What support is available if I hit a bug?
Can I use FlaUI in a commercial product?
Custom software development services
From first prototype to production, DEV.co delivers software development services around tools like FlaUI. Our software development agency staffs experienced software developers and web developers for custom software development, web development, integrations, and ongoing support across open-source testing and beyond.
Evaluate FlaUI for Your Windows Test Automation
FlaUI is a strong choice for teams building custom test automation frameworks on Windows. Review the 251 open issues, assess UIA2 vs. UIA3 compatibility, and verify community support meets your risk tolerance before adoption.