No-code / Low-code App Builders
Rectangle carries low lock-in (OSS macOS window manager) while Avalonia UI is high (OSS.NET UI framework). Rectangle is positioned for macos users who want keyboard-driven window snapping without config hassle, while Avalonia UI leans toward.net teams migrating wpf apps to linux, macos, or mobile platforms. In practice, Free open-source window manager for macOS with keyboard shortcuts and drag-to-snap — based on Spectacle. Cross-platform.NET UI framework for building desktop, mobile, web, and embedded apps using XAML and C#. Rectangle runs on free with a free tier; Avalonia UI runs on free with a free tier. Listed strengths unique to Rectangle include free open-source window snapping for macos, while Avalonia UI lists true cross-platform.net from one codebase on its side. Reach for Rectangle when you need macos window snapping with keyboard shortcuts and drag zones; reach for Avalonia UI when the job is cross-platform desktop app from a single c# + xaml codebase. The honest trade-off: Rectangle is not built for power users who want full i3-style tiling window management, and Avalonia UI is not the right call.
Quick take
Rectangle is for macos users who want keyboard-driven window snapping without config hassle; Avalonia UI is for.net teams migrating wpf apps to linux, macos, or mobile platforms; decide based.
| | | |
|---|---|---|
| Category | No-code / Low-code App Builders | No-code / Low-code App Builders |
| Pricing Model | free | free |
| Entry Price | — | — |
| Free Tier | Yes | Yes |
| Billing Complexity | — | — |
| Developer Experience | 4/5 | 4/5 |
| Pricing Transparency | 5/5 | 5/5 |
| Lock-in Level | low | high |
| Migration Complexity | — | — |
| Data Portability | — | — |
| Enterprise | — | — |
| GitHub Stars | 28.9k | 30.6k |
| License | NOASSERTION | MIT |
Choose Rectangle if macos users who want keyboard-driven window snapping without config hassle and you need a free tier to validate fit.
Not for: Power users who want full i3-style tiling window management
Choose Avalonia UI if.net teams migrating wpf apps to linux, macos, or mobile platforms and you need a free tier to validate fit.
Not for: Teams committed to platform-native SDKs like SwiftUI or Jetpack Compose
Check each tool's dedicated page for deeper reviews, setup notes, and pros/cons.
Both Rectangle and Avalonia UI expose free tiers with no headline entry price listed. The real comparison happens once you cross the free limits, and that pricing isn't captured in the summary data. Check each tool's pricing page for your volume band.
Technically you can move between any two tools in the same category, but effort varies: leaving Rectangle is relatively light thanks to its low lock-in, and onboarding to Avalonia UI commits you to high lock-in (OSS.NET UI framework). Plan for data export, re-integration, and a parallel-run window rather than a hard cutover.
Both Rectangle and Avalonia UI score 4/5 on developer experience in our data, so there's no clear winner on that axis alone. The real differentiator usually lands in SDK fit for your language, error handling, and docs depth. A half-day integration spike tells you more than the score.
Avalonia UI is an alternative in the same category, but its stated sweet spot is.net teams migrating wpf apps to linux, macos, or mobile platforms, while Rectangle's is macos users who want keyboard-driven window snapping without config hassle. If your job matches Rectangle's profile more closely, switching to Avalonia UI is a compromise. Use the best-fit match, not brand familiarity, to decide. Note: Avalonia UI is explicitly not for teams committed to platform-native sdks like swiftui or jetpack compose.
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