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A free posture app that actually runs on Linux

ErgoSense watches your posture through your webcam and nudges you when you slouch. Native builds, no browser tab, no subscription, and every frame analysed on your own machine.

Why this page exists

Search for a posture app and you will find a dozen good ones. Filter for Linux and the list collapses to almost nothing. Zen, BLiiNK, Nekoze and Posture Reminder AI are all macOS or Windows only. Of the ten apps in our full comparison, exactly three have native Linux builds — and one of those, Stretchly, is a timer that cannot see you at all.

That gap is not really technical. The computer-vision stack these apps use runs perfectly well on Linux; it is a commercial decision about which desktop market is worth packaging for. Since ErgoSense is free and has no market to protect, Linux gets the same build as everything else.

Install on Linux

  1. 1

    Pick your package

    Grab the .AppImage for a portable build that runs anywhere, the .deb for Debian, Ubuntu, Mint or Pop!_OS, or the .rpm for Fedora, RHEL or openSUSE. All three are on the latest release page.
  2. 2

    AppImage: make it executable

    AppImages ship without the execute bit, which is the single most common reason a download appears to do nothing when double-clicked.
    chmod +x ErgoSense.AppImage
./ErgoSense.AppImage
    AppImages need FUSE. On Ubuntu 22.04 and later install it with sudo apt install libfuse2, or run with --appimage-extract-and-run to skip FUSE entirely.
  3. 3

    Or install the package

    A packaged install puts ErgoSense in your application menu and lets your package manager handle updates.
    # Debian / Ubuntu / Mint / Pop!_OS
sudo apt install ./ErgoSense.deb

# Fedora / RHEL / openSUSE
sudo rpm -i ErgoSense.rpm
  4. 4

    Check webcam permissions

    Linux does not prompt for camera access the way macOS and Windows do — access is governed by file permissions on the device node. Confirm the device exists and that you are in the video group:
    ls /dev/video*
groups | grep video

# if video is missing:
sudo usermod -aG video $USER
# then log out and back in
  5. 5

    Set it to start with your session

    Posture monitoring only helps if it is running. Add ErgoSense to your desktop environment's startup applications — GNOME Tweaks, KDE's Autostart panel, or a .desktop file in ~/.config/autostart/.

Unsigned builds. ErgoSense binaries are not signed. On Linux that mostly means no verification prompt at all, which cuts both ways — you should check the SHA-256 checksum published alongside each release before running anything you downloaded from the internet, ours included.

Camera access on Linux, briefly

macOS and Windows both put camera access behind a consent dialog. Linux does not. Access to /dev/video0 is ordinary Unix file permissions, usually granted through membership of the video group, and on most desktop distributions your user is already in it.

Two situations break this. Sandboxed packaging — Flatpak, Snap, containers — has to be granted the camera device explicitly. And on a multi-seat or hardened server-derived install, the video group may simply not include you. Both are fixed by the commands in step four above.

Nothing leaves your machine. Inference runs locally through the V4L2 device. Frames are analysed and discarded — no recording, no upload, no account. If you want to verify that rather than take our word for it, watch the process with ss -tunp while it runs.

Tested distributions

The AppImage is built against an older glibc so it runs on essentially any distribution from the last few years. We test primarily on Ubuntu LTS and Fedora. Arch, Debian stable, Mint, Pop!_OS and openSUSE all work; if your distribution is unusual, the AppImage is the safest starting point because it carries its own dependencies.

Questions

Are there any posture apps for Linux at all?

Very few. ErgoSense and SitApp are the only two desktop apps we know of with native Linux builds and webcam-based posture detection. Stretchly runs on Linux but is a timer, not a posture monitor. SitSense works in a Linux browser. Almost every other app in this category — Zen, BLiiNK, Nekoze, Posture Reminder AI — is macOS or Windows only.

Which package should I download?

Use the AppImage if you want something portable that runs on any distribution with no installation and no root. Use the .deb on Debian, Ubuntu, Mint or Pop!_OS, and the .rpm on Fedora, RHEL or openSUSE, if you would rather have it managed by your package manager and appear in your application menu.

Does it work on Wayland?

Camera access itself is handled by V4L2 and works the same under both X11 and Wayland, so posture detection is unaffected. What can differ is tray-icon behaviour — some Wayland compositors, notably GNOME without an extension, do not implement the legacy system tray protocol. Install the AppIndicator extension on GNOME if the tray icon does not appear.

Why does the app not see my webcam?

Almost always a permissions issue rather than a driver one. Check that the device exists with ls /dev/video*, then confirm your user is in the video group with the groups command. If it is missing, add yourself and log out and back in. If you are running the app inside Flatpak or a container, the camera device also has to be exposed to the sandbox.

Is ErgoSense free on Linux, or is Linux a paid tier?

Free, with no tier and no cap. That is the whole point of this page — Linux users are routinely treated as an afterthought or excluded entirely in this category, and where support does exist it is often on the same subscription as everything else.

Free, and free of tiers

No account, no subscription, no Linux tax. Grab the AppImage and you are monitoring in under a minute.

Also available for macOS and Windows. See all features or the full app comparison.