Download

One .deb per app, for x86-64 Linux. No installer, no account, and nothing to activate once it is on the machine.

One of the three is published. Paint has releases; Snipper and Shrink are still being built and have no package to download yet. This page will list them the day they do, and their rows say so rather than offering a link that goes nowhere.

Installing a downloaded .deb

Use apt rather than dpkg -i. Both unpack the package, but only apt pulls in what it depends on, so the second command is not a list of missing libraries.

sudo apt install ./paint_0.2.0_amd64.deb

The ./ matters. Without it apt looks for a package by that name in your repositories instead of reading the file.

A .deb installed this way is not updated by apt upgrade. To get updates, add the app's repository instead.

From the APT repository

The repository way, so apt upgrade keeps the apps current along with everything else on the machine. One repository serves all of them; today it holds Paint.

sudo install -d -m 0755 /etc/apt/keyrings
curl -fsSL https://apt.buache.systems/buache-systems-archive-keyring.gpg \
  | sudo tee /etc/apt/keyrings/buache-systems.gpg > /dev/null
sudo curl -fsSL -o /etc/apt/sources.list.d/buache-systems.sources \
  https://apt.buache.systems/buache-systems.sources
sudo apt update && sudo apt install paint

The repository is a signed, static package index. Nothing about installing or updating asks you who you are.

What you need

Architecture
x86-64. No 32-bit and no ARM build today.
Distribution
Anything with glibc 2.35 or newer: Ubuntu 22.04+, Debian 12+, and their derivatives.
Display server
X11 or Wayland. Both are tested.
Desktop
Any. The applications are GTK, but nothing requires GNOME.

There is no Windows or macOS package on this page. Snipper and Shrink build and run on Windows, but nothing is published for it yet.

Building it yourself

Every app is a Flutter project with its packaging scripts in the repository, so the binary you would download is one you can also produce. That is the point of publishing the source: the claim that nothing leaves your machine is checkable rather than promised.