Yes. TinyJS targets macOS, Windows, and Linux, so the same project can be packaged for all three desktop operating systems. Support is not equally mature: TinyJS describes macOS as its primary stable platform, while Windows and Linux are beta targets.
Cross-platform support also does not mean identical behavior. TinyJS uses each operating system’s webview—WebKit on macOS, Chromium-based WebView2 on Windows, and WebKitGTK on Linux—so rendering, codecs, available APIs, installation requirements, and signing workflows can differ.
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What TinyJS officially supports
TinyJS’s homepage and FAQ identify all three desktop systems as targets, but they assign different maturity levels. macOS is the primary, stable platform. Windows support is beta, and Linux support is beta; the changelog records Linux beta support in version 0.29.0, dated July 23, 2026. You should therefore treat “runs on Windows, macOS, and Linux” as a supported-platform statement, not a guarantee that every feature has parity everywhere.
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The following matrix reflects the platform details published by TinyJS:
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| Platform | Official status | Operating-system and runtime requirements | Webview |
|---|---|---|---|
| macOS | Primary and stable | macOS 15 or later; Apple silicon and Intel are listed | WebKit |
| Windows | Beta | Windows 10 or Windows 11; WebView2 is required | Chromium-based WebView2 |
| Linux | Beta | x86_64 or arm64; glibc 2.35 or later; WebKitGTK 4.1 system package. TinyJS’s Linux launch note additionally cites Ubuntu 24.04 or later and current distributions with webkit2gtk-4.1. | WebKitGTK |
These requirements come from the TinyJS homepage and FAQ and its official changelog. Linux wording differs between the homepage and changelog, so verify the exact distribution, architecture, and package versions on every Linux release target rather than advertising a blanket “all Linux” promise.
How TinyJS makes one project work on three operating systems
A TinyJS desktop app is not shipped with one identical browser engine embedded in every installer. Instead, the app uses the host system’s webview:
- macOS: Apple’s WebKit implementation.
- Windows: the Chromium-based WebView2 runtime.
- Linux: WebKitGTK supplied by the distribution.
This approach can keep the application package smaller and lets TinyJS integrate with native platform facilities, but it makes the webview part of your compatibility surface. Differences in browser engine version, font rendering, CSS behavior, security policy, media support, and system integration can change what users see or what code can do. TinyJS’s own FAQ warns that an app will not necessarily look exactly the same on all three platforms.
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Platform prerequisites you need to check
macOS: the most mature target
TinyJS lists macOS 15 and later and supports both Apple silicon and Intel hardware. Development builds can be tested locally without preparing a public release, but distributing an app to other Mac users requires Apple-specific signing and notarization. The TinyJS repository README explains that a Developer ID Application certificate and notarization are needed for frictionless public installation; obtaining those credentials requires enrollment in the paid Apple Developer Program.
Plan the signing identity before your release pipeline is designed. A locally launched development build and a notarized download have different trust behavior, and users may see Gatekeeper warnings when a public build is unsigned or incorrectly signed.
Windows: beta support and WebView2
The homepage lists Windows 10 and Windows 11 as supported targets and says that WebView2 is needed. Windows 11 is described as having WebView2 preinstalled, but you should still check for the runtime during installation or first launch because machines can differ in servicing state, enterprise policy, or removed components. Do not assume every Windows 10 or Windows 11 environment has the same WebView2 version.
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Linux: distribution and package variation matter
TinyJS lists Linux beta builds for x86_64 and arm64, with glibc 2.35 or later and WebKitGTK 4.1 required. The project’s Linux launch note names Ubuntu 24.04 or later and current distributions that provide webkit2gtk-4.1. Since those statements describe the baseline differently, publish a tested distribution list and installation instructions instead of claiming universal Linux compatibility.
Linux dependencies are normally supplied by the distribution. Confirm that the target image contains the WebKitGTK 4.1 package and the required GTK libraries before launching the app. Media playback is another variable: available codecs can depend on installed GStreamer plugins. An application can start correctly while a particular audio or video format fails because the distribution does not include the corresponding plugin.
What can differ between platforms
Rendering and visual layout
Using system webviews means that fonts, antialiasing, default controls, scrollbars, color management, and some CSS features can vary. TinyJS does not promise pixel-identical output. Use responsive layouts, avoid relying on browser-specific defaults, and capture screenshots from each release build at the window sizes your users will use.
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Pay particular attention to text wrapping and controls near the edge of a window. A small change in font metrics can move a button, expose an overflow bug, or make a dialog unusable even when the underlying HTML is unchanged.
System APIs and capability gaps
TinyJS documents that some APIs remain platform-specific or unported. Its documentation recommends capability detection through TinyJS system capability APIs when a call may not exist on a particular operating system. Code should test for a capability before invoking it and provide a useful fallback when the result is unavailable.
Unsupported calls are intended to fail cleanly, according to the Linux launch notes, but “cleanly” does not mean “equivalent.” A feature that depends on a native integration may need to be hidden, replaced with a web-based workflow, or clearly marked as unavailable on one platform.
Media and codecs
Codec support is especially distribution-dependent on Linux because WebKitGTK relies on the installed GStreamer plugin set. Test every format your application accepts, including the formats used in onboarding screens, tutorials, notifications, and embedded help. If a codec is optional, detect playback failure and explain how the user can install the supported package rather than presenting a blank player.
Icons, signing, and other packaging details
TinyJS’s documentation provides separate configuration blocks named macos, windows, and linux. Use those blocks for genuine per-OS differences such as application icons and the macOS signing identity. Keeping platform-specific settings explicit is safer than scattering operating-system checks through application code.
How to build for each target
The important constraint is that tinyjs build packages the host platform’s launcher and signing tools. The official FAQ says you cannot run the command on a Mac and obtain a Windows application. Build on the platform you plan to ship, or use a CI runner for that operating system.
- Choose your release targets. Write down the exact macOS version and CPU architectures, Windows versions, and Linux distributions and architectures you will support.
- Install and verify prerequisites. On Windows, check that WebView2 is available. On Linux, verify glibc, WebKitGTK 4.1, GTK, and any GStreamer plugins your media features require. On macOS, confirm the deployment version and, for public distribution, your Developer ID credentials.
- Configure platform-specific settings. Add the relevant
macos,windows, andlinuxblocks for icons, signing, and other packaging differences as described in the TinyJS documentation. - Guard optional APIs. Use TinyJS capability detection before calling a feature that may not be implemented on every target. Supply a fallback or an explanatory error path.
- Run the build on the target operating system. Execute
tinyjs buildon macOS for the macOS package, Windows for the Windows package, and Linux for the Linux package, unless your CI system provides equivalent native runners. - Install the produced artifact on a clean machine. Test first launch without your development tools, with a standard user account, and with the network conditions your updater or remote content expects.
TinyJS says its own release process uses a CI matrix covering all three systems. That is a useful model: compile and package each target in an environment that actually runs that operating system, then collect the artifacts for release review.
Distribution, signing, and updates
Public macOS releases
For distribution beyond your own development Mac, use a Developer ID Application certificate and notarize the application. The repository README at TinyJS’s official repository identifies these requirements for frictionless installation. Signing does not make Windows or Linux builds equivalent; it is a macOS distribution requirement.
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Hosting an update package
The TinyJS FAQ says tinyjs publish creates a zip archive and a manifest that can be hosted on any static server. The built-in updater verifies the checksum and code signature, replaces the application, relaunches it, and can roll back if the update fails. Your release process still needs an orderly versioning policy, a way to retain the previous artifact, and a test of interrupted or failed updates.
Because the update mechanism relies on checksums and signatures, serve the manifest and archive without altering either file after publication. Test a fresh installation, an upgrade from the immediately previous version, a failed download, and a rollback before directing existing users to the new manifest.
Is TinyJS production-ready on all three systems?
The answer depends on where you need reliability. TinyJS’s own wording supports a clear distinction: macOS is the primary stable platform, while Windows and Linux are beta. A macOS-first product with a controlled beta audience on Windows and Linux fits that maturity profile. A product that requires identical behavior, broad Linux distribution coverage, or fully equivalent native APIs on day one should treat the beta labels as a release risk.
- Choose macOS first when you need the platform TinyJS identifies as stable and can use WebKit as your reference environment.
- Add Windows deliberately when you can require or provision WebView2 and are prepared to validate beta behavior on both Windows 10 and Windows 11.
- Add Linux with a published support matrix when you can name tested distributions, architectures, WebKitGTK packages, and codec expectations.
- Delay a platform feature when it depends on an API that capability detection shows is unavailable or inconsistent on that target.
Do not use the word “cross-platform” to hide these conditions. State the operating-system versions, architectures, webview dependencies, and known feature differences in your download page and support policy.
A practical cross-platform test checklist
Before release, test the same build workflow and user journeys on every target you claim to support:
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- Install and uninstall as a standard user.
- Launch with and without an existing configuration directory.
- Resize, maximize, minimize, and restore the main window.
- Open native file and folder pickers and verify paths with spaces and non-ASCII characters.
- Check keyboard shortcuts, focus order, text selection, clipboard operations, and screen scaling.
- Exercise every capability-detected API, including its fallback path.
- Play each supported media format, with Linux tested against the exact GStreamer packages you document.
- Run offline and on a slow connection if the app loads remote content or checks for updates.
- Install an update, interrupt it, and confirm checksum, signature, relaunch, and rollback behavior.
- On macOS, verify signing and notarization on a clean machine rather than relying only on a development launch.
Troubleshooting common failures
The app opens on one machine but not another
Compare the host prerequisites first. On Windows, inspect WebView2 availability. On Linux, compare architecture, glibc, WebKitGTK 4.1, GTK, and GStreamer packages. A package built successfully does not prove that those runtime dependencies exist on the user’s machine.
A page looks different from the development screenshot
Identify the webview in use and reproduce the issue on the same operating system and version. Check fonts, scaling, default form controls, and overflow at the affected window size. Fix the layout with portable CSS and explicit styles rather than assuming another platform’s rendering engine will match.
A native feature works on macOS but fails elsewhere
Move the call behind TinyJS capability detection. If the capability is absent, disable the control or provide a fallback and explain the limitation. Do not silently substitute data or claim support for an API that the target platform does not expose.
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Check the distribution’s GStreamer plugin set and the format’s support in WebKitGTK. Document the required package for the distributions you support, or convert the asset to a format available in your tested baseline.
Bottom line for a release decision
TinyJS desktop apps can run on Windows, macOS, and Linux. The dependable interpretation is “one codebase with three target packages,” not “one identical runtime everywhere.” Build each package on its target platform, test the corresponding system webview and dependencies, use capability detection for optional APIs, and publish a precise support matrix. macOS is the stable starting point; Windows and Linux are viable beta targets when their WebView2, WebKitGTK, distribution, codec, and signing requirements are part of your release plan.
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