Home screen of the Home HD app showing recent treatment sessions with blood pressure, fluid removed, and duration
The home screen. Every treatment I log shows up here. (Synthetic data.)

I have a chronic illness.

For years I planned my whole life around it. When to rest. When I could work. When I had energy and when I didn't. Most days I guessed wrong.

So I built software to help me.

A lot of numbers, every week

My condition means a lot of numbers to track. Blood pressure. Weight. Fluid. A blood-test panel every month. Supplies that run out if I stop counting. And the treatments themselves, several times a week.

For a long time that lived in a Google Sheet I hated opening. The sheet worked, but it didn't help. It stored numbers. It never told me anything.

What I built instead

Now it's an app. I built it myself, on my own time, for my own use. It does three things so far.

  • It logs each treatment — before, during, and after.
  • It reads my blood tests and shows the trends, two years of them.
  • It has an AI assistant that looks at my real data and answers questions. I can ask "why am I itching this week" and it points at the marker that actually moved.
Logging a live treatment session with timed readings, fluid goal, and supplies used
Logging a live session — readings come in while the treatment runs. (Synthetic data.)

None of this is a demo. I use it every week. The screenshots here use synthetic data, but the app is the one I actually run my life on.

I'm not a content creator

I'm a patient who got tired of guessing. I happen to build software for a living, so I built the thing I wished existed.

That's the honest version. I'm not selling an app. There's no waitlist. I wanted to stop opening a spreadsheet I hated, and I wanted answers I could trust — because they came from my own numbers.

What's next

Over the next few weeks I'll show how each part works: the tracking, the data, the AI assistant, and the architecture (it runs on £0).

And the part I'm building next: a daily readiness score from my own body data — sleep, heart rate, the rest — so I can plan my day around how my body actually is, not how I hope it is. That part isn't built yet. I'll show it honestly as I go.

If you live with something similar, follow along. I think a lot of us have the same problem.

About this series

This is part 1 of Home HD — a series on building a health system solo, from the daily tracker to the AI assistant and the cloud architecture behind it. Building production AI and data systems is also my day job at twentytwotensors; if that's useful to you, get in touch.