Best IUP Alternatives in 2026
The top IUP alternatives are Flutter, Electron and .NET MAUI: 15 desktop app development frameworks our editors would look at instead of IUP, in our ranking order.
IUP: A free native UI toolkit for C and Lua desktop apps on Windows and Linux. Where it falls short: targets windows and linux rather than mobile platforms.
Switching from IUP? For most desktop app development frameworks buyers the best IUP alternative is Flutter, built for teams building across platforms with one UI codebase.
Why People Look for an IUP Alternative
- Targets Windows and Linux rather than mobile platforms
- Regular development has been on hold since 2023
- Maintenance is limited to small bug fixes and changes
- No mobile targets — 1 of the alternatives below has it
Quick Picks by What You Need
- Best overallFlutter9.3
Teams building across platforms with one UI codebase
Visit Flutter - Best free optionFlutter9.3
Has a free plan
Visit Flutter - Best for mobile targetsCompose Multiplatform8.7
Mobile targets (IUP: no)
Visit Compose Multiplatform
All 15 IUP Alternatives, Ranked
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
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Best forTeams building across platforms with one UI codebase
- Better than IUP:
- Editor score 9.3 vs 5.3
An open-source Dart framework for building cross-platform apps from shared UI code.
- Open source
9.3/10★★★★★Visit Flutter -
Best forJavaScript teams building desktop apps
- Better than IUP:
- Editor score 9.1 vs 5.3
An open-source framework for building desktop apps from a shared JavaScript codebase.
- Open source
9.1/10★★★★★Visit Electron -
Best forC# teams targeting desktop and mobile
- Better than IUP:
- Editor score 9.0 vs 5.3
.NET MAUI shares C# and XAML development across native mobile and desktop apps.
- Open source
9.0/10★★★★☆Visit .NET MAUI -
Best forC++ teams needing a full-featured IDE
- Better than IUP:
- Editor score 8.9 vs 5.3
A full-featured C++ and QML IDE with broad build, debug, test, and deployment tools.
- Open source
8.9/10★★★★☆Visit Qt Creator -
Best forPython teams building Qt desktop applications
- Better than IUP:
- Editor score 8.8 vs 5.3
A broad Qt toolkit for Python desktop apps, with Android deployment and a commercial licensing path.
- Open source
8.8/10★★★★☆Visit Qt for Python -
Best forKotlin teams sharing declarative UI across platforms
- Better than IUP:
- Mobile targets
- Editor score 8.7 vs 5.3
A free Kotlin framework for shared UI, with JVM desktop apps and platform-specific installers.
- Mobile targets
- Open source
8.7/10★★★★☆Visit JetBrains -
Best forC# developers building Windows-only desktop apps
- Better than IUP:
- Editor score 8.6 vs 5.3
A free, Windows-only .NET framework for C# desktop interfaces built with XAML.
- Open source
8.6/10★★★★☆Visit Microsoft -
Best forJava teams building cross-platform desktop UIs
- Better than IUP:
- Editor score 8.5 vs 5.3
A broad Java UI toolkit for cross-platform desktop applications, with mobile and embedded support.
- Open source
8.5/10★★★★☆Visit OpenJFX -
Best forTeams building desktop GUIs with C or language bindings
- Better than IUP:
- Editor score 8.4 vs 5.3
A free, cross-platform toolkit for desktop GUIs, with widgets and multiple language bindings.
- Open source
8.4/10★★★★☆Visit GTK -
Best forTeams wanting visual design and native app toolchains
- Better than IUP:
- Editor score 8.3 vs 5.3
A Windows-based IDE pairing visual design tools with native Object Pascal toolchains.
8.3/10★★★★☆Visit Delphi -
Best forC++ teams needing a native cross-platform GUI API
- Better than IUP:
- Editor score 8.2 vs 5.3
A free, open-source desktop GUI library for C++ teams targeting multiple platforms.
- Open source
8.2/10★★★★☆Visit wxWidgets -
Best forPython developers using the Qt ecosystem
- Better than IUP:
- Editor score 8.1 vs 5.3
A broad Qt toolkit for Python GUI apps across desktop and mobile platforms.
- Open source
8.1/10★★★★☆Visit PyQt -
Best forPascal teams wanting a free visual desktop IDE
- Better than IUP:
- Editor score 8.0 vs 5.3
A visual Free Pascal IDE with building, debugging, testing, and desktop platform support.
- Open source
8.0/10★★★★☆Visit Lazarus -
Best for.NET teams building cross-platform interfaces
- Better than IUP:
- Editor score 7.9 vs 5.3
A cross-platform .NET framework with a free core and paid tooling, controls, and support.
- Open source
7.9/10★★★★☆Visit Avalonia -
Best forDelphi or C++ teams wanting an integrated IDE
- Better than IUP:
- Editor score 7.8 vs 5.3
An integrated toolchain for native desktop and multi-device app development, with a paid edition structure.
7.8/10★★★★☆Visit Embarcadero
IUP Alternatives: Common Questions
What is the best alternative to IUP?
Flutter: #1 in our Desktop App Development Frameworks ranking, with an editor score of 9.3 out of 10. An open-source Dart framework for building cross-platform apps from shared UI code.
Is there a free alternative to IUP?
Yes. Flutter, Electron, .NET MAUI, Qt Creator and Qt for Python have a free plan or a free tier (14 of the 15 alternatives on this page).
Why do people look for IUP alternatives?
Targets Windows and Linux rather than mobile platforms; Regular development has been on hold since 2023; Maintenance is limited to small bug fixes and changes.
How do I switch from IUP?
Export your data from IUP (most tools have an export in their settings). Sign up for the alternative; start on its free plan or trial if it has one. Import your export and set up the integrations your team relies on. Run both side by side for a short while, then cancel IUP.
How to Switch from IUP
- Export your data from IUP (most tools have an export in their settings).
- Sign up for the alternative; start on its free plan or trial if it has one.
- Import your export and set up the integrations your team relies on.
- Run both side by side for a short while, then cancel IUP.
IUP vs Each Alternative
| # | Tool | Free plan | Paid from | Open source | Score |
|---|---|---|---|---|---|
| 40 | IUP | Yes | Free | Yes | 5.3 |
| 1 | Flutter | Yes | Free | Yes | 9.3 |
| 2 | Electron | Yes | Free | Yes | 9.1 |
| 3 | .NET MAUI | Yes | Free | Yes | 9.0 |
| 4 | Qt Creator | Yes | €546/user/yr | Yes | 8.9 |
| 5 | Qt for Python | Yes | Yes | 8.8 | |
| 6 | Compose Multiplatform | Yes | Free | Yes | 8.7 |
| 7 | Windows Presentation Foundation (WPF) | Yes | Free | Yes | 8.6 |
| 8 | OpenJFX | Yes | Free | Yes | 8.5 |
| 9 | GTK | Yes | Free | Yes | 8.4 |
| 10 | Delphi | Yes | 8.3 | ||
| 11 | wxWidgets | Yes | Free | Yes | 8.2 |
| 12 | PyQt | Yes | Yes | 8.1 | |
| 13 | Lazarus | Yes | Free | Yes | 8.0 |
| 14 | Avalonia | Yes | €299/seat/yr | Yes | 7.9 |
| 15 | RAD Studio | No | No | 7.8 |
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update