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Uno Platform

Open-source .NET UI framework for Windows, mobile, web and Skia desktop targets.

What it is

Uno Platform is an Apache-2.0-licensed .NET UI framework for building applications from a shared C# and XAML or C# Markup codebase across Windows, Android, iOS, WebAssembly, macOS and Linux. Its open-source runtime is complemented by account-based Studio tooling such as Hot Reload and Hot Design. Actual target coverage depends on the development host, IDE, .NET workloads, platform SDKs and renderer, so single-codebase does not mean identical tooling or behavior everywhere.

Uno Platform pricing

Uno Platform does not publish a plan ladder we could verify. Free tier available.

Prices read from the vendor's own pricing page on 2026-08-24. Vendors change plans without notice — check the source before you budget. Price verification log.

Key features

  • Shared .NET UI

    Uses C# with XAML or C# Markup to share application and interface code across targets.

  • WebAssembly target

    Runs supported .NET UI applications in modern desktop and mobile browsers.

  • Skia desktop

    Targets desktop environments on Windows, macOS and supported Linux configurations.

  • Studio tooling

    Adds account-based Hot Reload and Hot Design workflows where the compatibility matrix permits.

Strengths and trade-offs

What works well

  • Broad target matrix: One .NET solution can target Windows, Android, iOS, browsers, macOS and Linux.
  • Familiar Microsoft UI model: C#, XAML and WinUI-aligned APIs reduce conceptual switching for .NET UI teams.
  • Open-source core: The Uno repository is available under Apache License 2.0.
  • Multiple IDE choices: Official setup paths cover Visual Studio, VS Code and JetBrains Rider.

Where it falls short

  • Host-dependent targets: iOS requires a current Mac/Xcode path, while WinAppSDK development is unavailable from macOS and Linux hosts.
  • Compatibility matrix: IDE, host OS, target, .NET version and renderer combinations do not all offer the same build or debugging support.
  • Upgrade work: Migration notes include removed target frameworks, tooling updates and platform-specific API changes.
  • Studio boundaries: Hot Design requires sign-in, supported project versions and XAML; it excludes C# Markup and currently has target limitations.

Who it is for

.NET teams that need a shared UI codebase across several verified desktop, mobile and web targets.

Pick it or skip it

Pick Uno Platform if

  • C# teams extending WinUI-style skills beyond Windows
  • Products whose required hosts and targets appear in the supported environment matrix
  • Applications that can test and tune each platform rather than assume pixel-identical behavior

Skip it if

  • A required target or debugging workflow is unsupported from the team's development hosts
  • The product depends heavily on native controls or APIs not proven through Uno abstractions
  • You cannot maintain platform SDKs, .NET workloads and target-specific QA

Our verdict

Choose Uno Platform after proving the exact host–IDE–target combinations, not from the target list alone; build a representative feature slice on every shipping platform and rehearse framework upgrades before standardizing.

Frequently asked questions

Does Uno Platform have a free plan?
Yes. Uno Platform offers a free tier with limits; paid plans unlock higher usage or team features.
Who is Uno Platform best for?
.NET teams that need a shared UI codebase across several verified desktop, mobile and web targets.
What are the main drawbacks of Uno Platform?
The trade-offs we noted: Host-dependent targets: iOS requires a current Mac/Xcode path, while WinAppSDK development is unavailable from macOS and Linux hosts.; Compatibility matrix: IDE, host OS, target, .NET version and renderer combinations do not all offer the same build or debugging support.; Upgrade work: Migration notes include removed target frameworks, tooling updates and platform-specific API changes..
When should you not use Uno Platform?
Skip Uno Platform if: A required target or debugging workflow is unsupported from the team's development hosts; The product depends heavily on native controls or APIs not proven through Uno abstractions; You cannot maintain platform SDKs, .NET workloads and target-specific QA.

What we checked

  • Public APIOffers a documented API you can build against.Yes
  • Mobile appHas a native app for iOS or Android, not just a mobile website.No
  • Open source / self-hostableSource is open and the tool can be run on your own infrastructure.Yes
  • SSO (SAML)Supports SAML single sign-on on at least one plan.No

“Not checked” means exactly that — we have not verified it, and we do not guess.

Evidence and freshness

Status: Official sources reviewedReviewed: 2026-08-24

Limit: Official Uno Platform documentation and source repository were reviewed; ToolCompare did not create or migrate an application, activate Studio, test Hot Reload or Hot Design, validate native APIs, assess accessibility, benchmark rendering, audit NuGet dependencies or run the same UI across supported targets. Commercial Studio terms were not independently quoted. The pricing source was added by an automated check: the page was fetched on this date and contained pricing information. The other sources on this record were read by an editor.

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