Alternatives to Flatpak
Sandboxed application packaging for Linux, with shared runtimes and Flathub. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
Flatpak
Sandboxed application packaging for Linux, with shared runtimes and Flathub.
Replacements
Listings that take over the same core job as Flatpak.
Snap
Canonical's universal Linux packages with confinement and automatic updates.
Snap is Canonical's universal format with automatic updates, rollback and release channels, but the Snap Store back end is proprietary and first launches are slower.
AppImage
Portable Linux application format that runs from a single file with no install.
AppImage runs each app from a single file with no install or root, but has no sandboxing by default and no automatic updates unless the app adds them.
Nix
Functional package manager with reproducible builds and atomic rollbacks.
Nix is a functional package manager for Linux and macOS with reproducible builds and atomic rollbacks, at the cost of a steep learning curve.
Homebrew
Package manager for macOS and Linux with formulae and GUI app casks.
Homebrew is a package manager for macOS and Linux with prebuilt bottles, but it provides no sandboxing and upgrades can bring dependency churn.
GNU Guix
A transactional package manager and GNU/Linux distribution whose packages and system configurations are written in Guile Scheme.
GNU Guix offers transactional, reproducible per-user package management configured in Guile Scheme, and packages only free software.
Similar software
Related functionality, not a direct replacement.
Gear Lever
Integrate AppImage applications into your Linux desktop.
UniGetUI
One graphical interface for WinGet, Chocolatey, Scoop, pip, npm and a dozen other package managers, so updates happen in one place.
Flatseal
A graphical utility for reviewing and changing the permissions of installed Flatpak applications.
Warehouse
A Linux desktop app for viewing, batch managing and cleaning up installed Flatpak apps and their data.
Topgrade
Run updates across the package managers already installed on your system.