Best GUI Builder Products in 2026

Build .NET apps in your browser using AI, direct C#/XAML editing or a visual designer. Publish to Web and Desktop, or open the same project in Visual Studio. Free, no setup, no lock-in.

Key XAML.io features:

No installation required Visual designer with live preview Real C# and .NET running client-side Easy sharing and collaboration

free $20 / Monthly (Pro20)

AI story outline analysis for authors, screenwriters, playwrights, and editors. Analyze your book, screenplay, or story outline for pacing, structure, character arcs, tension, plot logic, and weak spots before you draft.

Key Outline Analyzer features:

Outline Analysis Chapter breakdown Character Arc Review Act Structure Graph

Visit website paid $4.99 / One-off Sponsored

The Workbench for agentic .NET application development.

Key Uno Platform features:

.NET IDEs Cross-Platform Development Hot Reload Native Performance

Open Source freemium $39.99 / Monthly

A multi-platform .NET UI framework.

Key Avalonia features:

Cross-Platform MVVM Support Rich Styling System Open Source

Open Source

Qt Creator is a cross-platform C++, JavaScript and QML integrated development environment. It is the fastest, easiest and most fun experience a C++ developer could wish for. .

Key Qt Creator features:

Cross-Platform Development Integrated Development Environment (IDE) Rich Library of Widgets Strong Community and Documentation

🔥 Design real websites right on the canvas.

Key Framer features:

Interactive Prototyping Code-based Design Real-time Collaboration Rich Component Library

Open Source

Build prototypes, get user feedback, and make data-driven decisions. The AI prototyping platform for product teams.

The world's first AI Fullstack Engineer.

Key Lovable features:

Intuitive User Interface Comprehensive Documentation Feature-Rich Integration Capabilities