The Stack 42Independent software
Small tools that keep your things in your hands.
The Stack 42 makes apps for keeping track of the people, files, and servers in your life. They store your data on your own devices, or on a server you run, and they're built to be maintained for years.
Our first app
ContactDeck
MaciPhoneiPadIn development
A personal address book with a memory. Every contact is a card with its own timeline of calls, coffees, texts, and notes, plus birthdays, life events, the people they're connected to, and gentle check-in reminders. Everything stays on your device.
Also in the stack
These are self-hosted web apps we build and run for our own household. They aren't offered for download yet, but they shape how everything here is made.
CargoDeck
File sharing with end-to-end encryption. Files and their names are encrypted in the browser before upload, so the server only ever stores ciphertext.
ClusterDeck
A browser dashboard for running a dedicated game server in Docker: settings, backups, world resets, and start and stop, without a terminal.
ContactDeck for the web
The self-hosted server behind ContactDeck. It's also the version people use on Windows and Android, from any browser.
How we build
Your data stays yours
Our apps work without an account with us. Data lives on your device or on a server you control, and you can export all of it in open formats.
Nothing watching
No ads, no analytics, no tracking, no third-party SDKs that phone home. That includes this website: it sets no cookies.
Checked, then shipped
ContactDeck's Mac and iPhone apps are tested against the web version's own rules, so the same data gives the same answers everywhere.