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Build and install the app from its manifest, launch it with flatpak run <application-id>, and check the functions that matter for your app. If you also need a single-file .flatpak bundle, export the app to a repository, create the bundle, then install and test that file separately. Building a bundle does not prove the app works, and the bundle does not include its dependencies or AppStream data.
Build and test the app from its manifest
For a development workflow, install the build for your user rather than system-wide. Flatpak Builder builds from a manifest, which defines the app and its modules. The official tutorial uses this sample command; replace the sample values with those for your project:
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flatpak-builder --force-clean --user --install-deps-from=flathub --repo=repo --install builddir org.flatpak.Hello.ymlThe manifest filename, build directory, remote and application ID above are examples, not universal values. Use the remote that provides the dependencies your project needs. The --user option installs for the current user, while --repo exports build output to a repository. Flatpak Builder obtains and verifies sources, builds modules, applies sandbox permissions and exports the result. See the official first-build tutorial and build overview.
Launch the installed build
Use the application ID from your manifest:
flatpak run <application-id>Check that the app starts, then exercise its important functions and integrations in the environment where it is expected to run. A successful build only shows that the build process completed; it does not validate the app’s behavior.
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Run module tests if the manifest defines them
Flatpak Builder can run a module’s tests when its manifest includes run-tests: true. The manifest can also use test-rule to select a test target, test-commands to add commands and test-args to pass sandbox arguments to the tests. Test arguments do not affect normal installation. These checks are distinct from launching the installed app and verifying its UI, permissions, integrations and packaging. See Flatpak Builder’s module test documentation.
Create a single-file bundle
A bundle is useful when you want to transfer or provide one downloadable file. First export the app to a repository, then create the bundle from that repository:
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flatpak build-bundle <repo-dir> <filename.flatpak> <application-id> [branch]The branch is optional in the command syntax; use the branch that matches your app when needed. You can attach a runtime repository with --runtime-repo=<url> so an installer has a source to obtain runtime content from if necessary. For example, adapting the official tutorial’s pattern:
flatpak build-bundle <repo-dir> <application-id>.flatpak <application-id> --runtime-repo=<runtime-repo-url>Replace every placeholder with a real project value. The correct repository path, application ID, branch, runtime and runtime repository depend on the app. Command syntax and behavior can vary with installed Flatpak versions; consult the single-file bundle documentation.
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Install and test the bundle itself
Testing an app installed from a build is not the same as testing the bundle you plan to share. Install the resulting file for your user, then launch by application ID:
flatpak install --user <application-id>.flatpak
flatpak run <application-id>Confirm the installation prompt and exercise the app again. The official tutorial demonstrates installing its sample bundle with flatpak install --user hello.flatpak; your filename and app ID will differ. When finished, remove the local installation with:
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flatpak remove <application-id>See the Flatpak command-line documentation for install, run and remove commands.
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A single-file bundle omits dependencies and AppStream data, so it is not necessarily a self-contained offline installer. If the recipient lacks the required runtime, installation may need access to a suitable runtime source and a working network connection. A runtime repository can help provide that source, but it does not turn the app bundle into a package containing all dependencies. For offline transfer, the Flatpak documentation points to create-usb as the preferred approach.
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Choose between a bundle and a repository
| Distribution method | Best fit | Important trade-off |
|---|---|---|
| Repository | Ongoing delivery when users need updates | Requires hosting and maintaining a repository; repositories support updates. |
| Single-file bundle | A direct download, attachment or removable-media transfer when runtime availability is understood | Does not include dependencies or AppStream data and may require a runtime source and network access. |
Flatpak’s documentation says hosting a repository is the preferred distribution method because repositories allow apps to be updated. For offline distribution, see the USB drive documentation.
Quick Recap
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