Compare Linux package formats
Linux has several good ways to deliver software. They solve different problems, so the right choice depends on the application, its users and who will maintain the package.
| Format | Best fit | Build input | Shared base | Isolation | Distribution |
|---|---|---|---|---|---|
| cpak | Desktop apps, developer tools, services and complete sessions built as OCI images | Containerfile, OCI image and cpak.json | Versioned platform packages and nested dependencies | Namespaces with explicit manifest permissions and typed host actions | Any Git origin and OCI registry; the cpak Store is optional |
| Flatpak | Cross-distribution desktop applications | Flatpak manifest and flatpak-builder modules | Versioned Flatpak runtimes | Bubblewrap sandbox, static permissions and desktop portals | Any Flatpak remote; Flathub is the main public catalogue |
| Snap | Desktop, server and device software in the Snap ecosystem | snapcraft.yaml and Snapcraft parts | Versioned base snaps | Strict confinement through AppArmor, seccomp and interfaces; classic confinement is also available | Snap Store and snapd channels |
| AppImage | A portable desktop executable that runs without installation | Application directory bundled into one image | No required shared runtime | No sandbox is provided by the format | Direct file download or any file host |
| DEB or RPM | System components and software maintained for a specific distribution | Distribution source and binary package recipes | Host distribution libraries | Normal host permissions unless the application adds its own isolation | Distribution repositories or third-party repositories |
| Distrobox | Mutable development and command-line environments integrated with the host | A container image managed through Podman, Docker or Lilipod | Container distribution image | Container engine namespaces with broad host integration by design | Container registries; it is not an application store format |
When cpak fits
cpak is useful when the software already builds in a Containerfile, needs direct Linux integration or has to run in more than one context. The same package model can describe a desktop application, a command-line tool, a service or a complete desktop session. OCI layers provide transport reuse, while cpak storage drivers deduplicate content locally across packages.
The manifest lists host access before installation. Applications can use typed host actions and native file choosers without being rewritten around a portal API. A package can be published from its own Git repository and registry, then listed in the Store without moving ownership to a central build service.
cpak is younger than the other formats in this comparison. Its public catalogue and distribution packaging are smaller, and some Linux environments have received less field testing. Use the host compatibility guide before making it the only delivery method for a large audience.
When Flatpak fits
Flatpak has a mature desktop-focused ecosystem, established runtimes and wide distribution support. Its sandbox starts with little host access, then manifests and portals provide the resources an application needs. Flathub offers a familiar place for users to discover and update applications.
Choose Flatpak when desktop reach, existing tooling and portal integration matter more than reusing a Containerfile or distributing outside the Flatpak runtime model.
When Snap fits
Snap covers desktop software, servers and managed devices. Strict snaps use interfaces to access host resources, while base snaps provide the runtime filesystem. Channels and automatic refreshes are built into snapd and the Snap Store.
Choose Snap when its store, update model, Ubuntu integration or device management matches the deployment. Classic confinement is available for software that cannot work within strict interfaces, but its publication requires store review.
When AppImage fits
AppImage is direct: download one executable file, mark it as executable and run it. It does not require a system service or package installation. This makes it useful for portable tools, test builds and software delivered from a project website.
The format does not provide a sandbox, a mandatory update service or shared runtimes. Those features can be added by applications and external tools, but they are not guarantees of the format itself. See the AppImage concepts for its model.
When DEB or RPM fits
Native packages remain the right choice for kernels, drivers, system services and components that must follow the distribution lifecycle. They integrate with the host package manager and use the exact libraries, policies and upgrade process maintained by that distribution.
That integration also creates maintenance work across distributions and releases. A native application package may need separate recipes, dependency names and testing for Debian, Ubuntu, Fedora, openSUSE and their supported versions.
When Distrobox fits
Distrobox creates mutable Linux environments with close access to the user's home, display, audio and devices. It is particularly useful for development tools, distribution-specific commands and interactive work. Its own documentation describes that host integration model.
It is not a direct replacement for an application package catalogue. Choose it when the user wants a container environment they can enter and modify. Choose an application format when the publisher must define the application, permissions, updates and desktop entry as one reviewed package.
Verify the package, not only the format
A format cannot make an untrusted publisher safe. Check the origin, build recipe, requested permissions, update source and maintainer for the exact package you plan to install. The cpak Store exposes the manifest, OCI image, dependencies and permissions on every application page for that reason.
