Snap vs Flatpak vs AppImage: Which to Use on Linux?

Tested on: Ubuntu 26.04 LTS · Debian 12 · Fedora 44 · Arch Linux — Last updated: June 2026

Linux has three universal package formats that work across distributions: Snap, Flatpak, and AppImage. Each solves the same problem differently — letting you install software without depending on your distro's package repositories. This guide explains how each works under the hood, how to install and manage them, and their real trade-offs so you can make an informed choice instead of just using whatever your distro defaults to.

Prerequisites

You need a working Linux installation with sudo access. Basic terminal familiarity is assumed. The commands below are tested on Ubuntu 26.04, Debian 12, Fedora 44, and Arch Linux. Where commands differ by distro, variants are shown explicitly.

Quick Comparison

Snap

Snap was created by Canonical and ships as the default package format on Ubuntu. A snap is a SquashFS image — a compressed read-only filesystem — that gets loop-mounted at runtime. The sandboxing is handled by AppArmor profiles and seccomp filters. The snapd daemon runs in the background and handles updates automatically, typically during idle hours.

One architectural detail worth understanding: every snap bundles its own libraries. There's no shared runtime model. This is why snap list on a fresh Ubuntu install already shows several hundred megabytes of disk usage — each snap is self-contained, and multiple snaps each carry their own copy of common libraries.

Installing and using Snap

# Install snapd
sudo apt install snapd          # Debian/Ubuntu
sudo dnf install snapd          # Fedora
sudo pacman -S snapd            # Arch

# Enable the socket and the main service
sudo systemctl enable --now snapd.socket
sudo systemctl enable --now snapd

# On Arch, also enable the snap mount unit
sudo systemctl enable --now snapd.apparmor  # if AppArmor is active

# Install an app
sudo snap install vlc
sudo snap install spotify

# Some apps require --classic, which disables the sandbox entirely
sudo snap install code --classic
sudo snap install go --classic

# List installed snaps and their versions
snap list

Example output from snap list:

Name       Version          Rev    Tracking       Publisher   Notes
core22     20240408         1122   latest/stable  canonical✓  base
snapd      2.63.1           21759  latest/stable  canonical✓  snapd
vlc        3.0.21           3777   latest/stable  videolan✓   -
code       1.89.1           168    latest/stable  vscode✓     classic

# Manually trigger an update
sudo snap refresh

# Refresh a specific snap
sudo snap refresh vlc

# Check for pending refreshes without applying
sudo snap refresh --list

# Remove a snap
sudo snap remove vlc

# Remove a snap but keep its data
sudo snap remove --purge vlc

Snap pros and cons

• Pro: Automatic background updates — the daemon handles it with no user interaction
• Pro: Large catalogue including proprietary apps (Spotify, Slack, VS Code, IntelliJ)
• Pro: Also handles server daemons — snap install nextcloud sets up a full service
• Con: Slow first launch — the SquashFS image must be mounted and the runtime initialised. VS Code via snap can take 3–5 seconds on first open versus under 1 second as a native .deb
• Con: Centralised and controlled — all snaps come from Canonical's store. There is no way to add a third-party snap remote. Self-hosting requires running a full Snap Store proxy
• Con: Poor theme integration on KDE, XFCE, and other non-GNOME desktops
• Con: Disk usage accumulates fast — snapd keeps the previous revision alongside the current one by default, so each update doubles storage until you clean up

Flatpak

Flatpak is the community's preferred universal package format, with strong support across GNOME, KDE, and most major distros. Unlike Snap, Flatpak uses a shared runtime model: a runtime like org.freedesktop.Platform or org.gnome.Platform is installed once, and multiple apps built against that runtime share its libraries. This significantly reduces per-app disk usage once you have a few apps installed. Sandboxing is implemented using bubblewrap for namespace isolation plus xdg-dbus-proxy for portal-based access to host services.

Flatpak also supports multiple repositories (called remotes). Flathub at https://flathub.org is the primary one, but organisations can self-host remotes, and some distros ship their own (GNOME Nightly, KDE Nightly, elementary AppCenter).

Installing and using Flatpak

# Install Flatpak
sudo apt install flatpak          # Ubuntu/Debian
sudo dnf install flatpak          # Fedora (often pre-installed on Workstation)
sudo pacman -S flatpak            # Arch

# On Ubuntu/Debian, also install the GNOME Software plugin if you use GNOME Software
sudo apt install gnome-software-plugin-flatpak

# Add Flathub
flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo

# List configured remotes
flatpak remotes

# Install apps from Flathub (use the app ID)
flatpak install flathub org.gimp.GIMP
flatpak install flathub com.spotify.Client
flatpak install flathub org.mozilla.firefox

# Run a Flatpak app
flatpak run org.gimp.GIMP

# Search Flathub from the command line
flatpak search gimp

# List installed Flatpaks
flatpak list --app

# Update all Flatpaks
flatpak update

# Update a specific app
flatpak update org.gimp.GIMP

# Remove an app
flatpak uninstall org.gimp.GIMP

# Remove unused runtimes and reclaim disk space
flatpak uninstall --unused -y

Managing Flatpak permissions

One of Flatpak's strongest features is fine-grained permission control. By default, a sandboxed app only sees what it needs — but some Flathub apps ship with broader permissions than necessary. You can inspect and override them.

# View an app's declared permissions
flatpak info --show-permissions org.gimp.GIMP

# Grant access to the user's home directory
flatpak override --user --filesystem=home org.gimp.GIMP

# Grant access to a specific path only
flatpak override --user --filesystem=/mnt/data org.gimp.GIMP

# Revoke network access (useful for apps that don't need it)
flatpak override --user --no-share=network com.someapp.App

# Reset all overrides for an app
flatpak override --user --reset org.gimp.GIMP

# View active overrides
flatpak override --user --show org.gimp.GIMP

For a GUI approach, Flatseal is the standard tool:

flatpak install flathub com.github.tchx84.Flatseal
flatpak run com.github.tchx84.Flatseal

Auto-updating Flatpaks with a systemd timer

Flatpak doesn't auto-update by default from the command line, but you can set this up trivially with a systemd user timer:

# Create the service file
mkdir -p ~/.config/systemd/user
cat > ~/.config/systemd/user/flatpak-update.service << 'EOF'
[Unit]
Description=Update Flatpak applications

[Service]
Type=oneshot
ExecStart=/usr/bin/flatpak update --noninteractive -y
EOF

# Create the timer (runs daily at 10:00)
cat > ~/.config/systemd/user/flatpak-update.timer << 'EOF'
[Unit]
Description=Daily Flatpak update timer

[Timer]
OnCalendar=daily
Persistent=true

[Install]
WantedBy=timers.target
EOF

# Enable and start the timer
systemctl --user enable --now flatpak-update.timer

# Verify
systemctl --user list-timers flatpak-update.timer

Flatpak pros and cons

• Pro: Best desktop integration — .desktop files, MIME types, system font and icon theme inheritance
• Pro: Multiple remotes — Flathub, Flathub Beta, GNOME Nightly, KDE Nightly, or self-hosted
• Pro: Shared runtimes reduce per-app disk usage significantly once you have more than a handful of apps
• Pro: Granular, auditable permissions with override capability
• Pro: Decentralised — no single organisation controls the entire ecosystem
• Con: No auto-updates out of the box on the command line (GNOME Software and KDE Discover do handle this automatically if you're using a full desktop stack)
• Con: Some apps on Flathub have overly permissive default permissions — always check with flatpak info --show-permissions
• Con: Runtime downloads can be large on first setup (a GNOME runtime is roughly 300–400 MB)

AppImage

AppImage is conceptually the simplest format: one file, run anywhere. An AppImage bundles the application binary, its libraries, and any assets into a single executable file using SquashFS internally. When you run it, it mounts itself via FUSE, executes the app, and unmounts cleanly when you exit. No package manager, no root, no daemon, no installation at all.

This also means no sandbox, no automatic updates (with some exceptions), and no central catalogue. AppImages are typically distributed directly from project websites or GitHub releases.

Running AppImages

# Download an AppImage (example: Krita)
wget https://download.kde.org/stable/krita/5.2.3/krita-5.2.3-x86_64.appimage

# Make it executable
chmod +x krita-5.2.3-x86_64.appimage

# Run it
./krita-5.2.3-x86_64.appimage

# Extract the contents without running (useful for inspection)
./krita-5.2.3-x86_64.appimage --appimage-extract

FUSE must be available. On most modern distros it is, but if you hit errors:

sudo apt install fuse libfuse2   # Ubuntu/Debian (libfuse2 specifically — not fuse3)
sudo dnf install fuse            # Fedora

Desktop integration with AppImageLauncher

Without tooling, AppImages don't appear in your application menu. AppImageLauncher solves this — it intercepts AppImage launches and offers to integrate them into your desktop:

# Ubuntu/Debian — add the PPA
sudo add-apt-repository ppa:appimagelauncher-team/stable
sudo apt update
sudo apt install appimagelauncher

After installation, double-clicking any AppImage prompts you to either run it once or integrate it. Integration moves it to ~/Applications/ and creates a .desktop entry with icon. Removing it through the application menu also cleans up the launcher entry.

AppImage pros and cons

• Pro: Zero installation — download and run, no root, no package manager
• Pro: Completely portable — copy to a USB drive and run on any x86_64 Linux system
• Pro: Easy side-by-side versioning — keep app-1.0.appimage and app-1.1.appimage and switch between them freely
• Pro: Useful for software not packaged anywhere — many niche or proprietary tools ship only as AppImages
• Con: No sandbox — the app runs with your full user permissions
• Con: No centralised update mechanism. Some AppImages use AppImageUpdate internally; most don't. You're responsible for tracking new releases
• Con: Poor desktop integration without AppImageLauncher, which adds another dependency

Cleaning Up Disk Space

Universal package formats are notorious for accumulating disk usage. Here's how to reclaim it on each.

# --- Snap: remove disabled (old) revisions ---

snap list --all | awk '/disabled/{print $1, $3}' |

  while read name rev; do

    sudo



Further Reading

20 Things to Do After Installing Ubuntu
Linux Package Managers Compared
How to Install Ubuntu 26.04 LTS


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