Open-source apps · on your own computer
Apps that adapt to you.
Open-source apps that run on a computer you already own, share what they know with each other, and can be rewritten by your own AI to fit how you live.
Runs on a Mac or Linux computer that stays on — a Mac mini is ideal, an old laptop works. Works with your Claude or ChatGPT plan. Early access is free.
Today read 9 apps · just now
Every app you use was built for a million people. None of them were built just for you.
Your meal planner doesn’t know you trained today. Your budget doesn’t know what the grocery list costs. And when an app doesn’t fit the way you live, you either work around it or leave.
Your version
Most apps let you pick a colour. Ion lets you change the app.
Tell your AI what you’d do differently, in plain language. It rewrites the app on a private draft, you try it out, and you keep it if you like it.
At launch, updates keep your changes: new versions are merged with yours, and you preview before anything changes.
Want more than a change? Build your own app →
How it works
Apps that know each other
Install a second app and the first one gets smarter. You approve every connection, and every read is logged.
The AI you already pay for
Ion runs Claude Code or Codex with your own plan: when you ask, and in the background for apps you allow.
On every screen you use
iPhone, iPad, Mac, or any browser. Your watch taps you when something needs you.
Tasks
Forge
For your household. And your business.
The same library works at home and at work, and you can share any app by email with the people who need it.
Household
Recipes
Plan the week’s meals and send the list to Grocery.
Grocery
One list for the week, built from what you’re cooking.
Calories
A daily target that moves with your training.
Training
Workouts, sets and personal records.
Business
Ledger
Invoices, payouts and expenses, and who still owes you.
Pipeline
Deals and follow-ups. Your AI drafts the nudges; nothing is sent without you.
Reel
Cut and caption video on your own computer.
Board
Boards for a small team, on the same tasks as Tasks.
Share any app. They don’t need Ion.
Invite someone by email and they get a link and a one-time code. They don’t install anything or make an account, and they only see the app you shared with them.
Why Ion
Runs on what you have
Any Mac or Linux computer that can stay on. Start private over Tailscale — no domain needed — and add sharing when you want it.
Stop renting apps
A calorie counter, a CRM, bookkeeping — each one is usually its own subscription. Ion’s apps are open source and run on your computer.
Your data stays yours
- Stored on your computer.
- Every app in its own container.
- Every cross-app read is logged.
- Ion never holds your AI credentials.
How Ion keeps your data safe →
Ion is early software, provided without warranty. Self-hosting means you’re the administrator.
Mouseion
Have an app idea? Build it.
You don’t need to be a developer. Describe the app you wish existed; Mouseion plans it with you and builds it on your own computer.
Questions
Can’t find it? Email hello@useion.ai, or ask when you join the list.
What is Ion?
Ion is a self-hosted app library whose open-source apps share one context, work with your Claude or ChatGPT plan, and can be rewritten by your AI to fit you.
What computer do I need?
Any Mac or Linux computer that can stay on, such as a Mac mini or an old laptop. Setup is guided, and you don’t need a domain to get started.
Does Ion include AI?
No. Ion runs Claude Code or Codex on your own machine, signed in with your own plan or API key. Your usage comes from your own plan and is subject to its limits. That includes background use by apps you’ve allowed.
Does my AI run in the background?
Only for apps you allow. Some apps, like Pipeline, can use your AI in the background. You can see which ones do and switch it off for any app. Background use counts toward your plan’s limits.
How much does it cost?
Pricing hasn’t been announced yet. Joining early access through the waitlist costs nothing.
Can I use Ion for my business?
Yes. The launch library includes Ledger for invoices and expenses, Pipeline for deals and follow-ups, Board for kanban boards and Reel for video, and you can share any app with a teammate by email.
Get early access.
Invite-only, released in small waves. Free during early access.