Your own training app,
built around your body

Answer some questions once. Claude writes your training programme, plans your food if you want it, and builds you an app you keep on your phone. Then it coaches you session by session using what you actually lifted.

£39.90 £25 one-off · yours to keep
Launch price until 31 December 2026. It goes to £39.90 in the new year.
Get IRON/OS
Needs a paid Claude plan · Set up on a computer, use on your phone

What you get

Not a template you fill in. The programme is written from your answers, and the app is generated to match it.

The IRON/OS workout app on a phone: an illustrated goblet squat card with anchor and knee watch tags, three sets to log, and the rest timer running

A programme for you

Built from your goal, equipment, schedule and current lifts. You read and approve it before anything is built.

302 illustrated moves

Proper drawn figures, not stick men. Tap any exercise to play through the movement frame by frame.

Swap any exercise

Machine taken? Swap it in the app. Your sets and reps carry over, and your history follows the movement.

Meal plans too

Optional. Choose counting or no counting, get a week of meals with methods and a shopping list by aisle.

Injuries taken seriously

Painful movements are excluded, not just made lighter. Substitutions change the thing that actually hurt.

Ongoing coaching

Tell Claude how the session went. It reads your history, sets the next one, and changes the plan as you change.

Phases and progress

Volume drops while dieting and climbs while building. A weekly tab shows sets per muscle, and PBs get celebrated.

Your data stays yours

No account, no cloud, no tracking. Everything lives on your own computer and phone. Nothing is ever sent to us.

Getting started

About fifteen minutes, most of it spent answering questions.

1
Download and unzip

Inside you'll find install.html and a folder called iron-os.

2
Open install.html

It walks you through setup with copy-paste commands for Windows and Mac.

3
Say "set up my training app"

Claude asks whether you want training, food, or both, then interviews you and builds it.

You need Claude. Either Claude Code in a terminal or the Claude desktop app. Needs a paid Claude plan (Pro, from about $20 a month) or API credits. The free plan does not include Claude Code. Works on Windows, Mac and Linux.
Fitness guidance, not medical advice. If something hurts badly, is getting worse, involves numbness, or followed an accident, see a physiotherapist or doctor before starting any programme.

Questions

The ones people ask before they buy.

What do I need?

Claude, on a paid plan. Claude Code needs a Pro plan or above (Pro is about $20 a month) or API credits. The free plan does not include Claude Code. Windows, Mac or Linux.

What is a Claude skill?

A folder of instructions that Claude reads. Nothing is installed on your computer. Delete the folder and it is gone.

Do I need to know how to code?

No. You copy and paste two commands into a terminal, once, and the guide shows you exactly where to click to open one. Everything after that is a conversation.

How does the app get onto my phone?

Host the file for free on Netlify Drop, then add the link to your home screen. The guide walks you through it.

Where does my data go?

Nowhere. Your history lives on your own device. There is an optional sync you set up and own yourself. Nothing is ever sent to us.

What if I get injured, or my plan changes?

Tell Claude. It changes the programme and rebuilds the app.

Can I use it on more than one phone?

Yes. The same link works on all of them. History is kept per device, and Export backup and Restore move it across.

Questions before buying: email TODO

Get IRON/OS

One payment, no subscription. Yours to keep and use as long as you like.

Buy

£39.90£25
Launch price until 31 December 2026.

One-off payment. Includes the skill, the app builder, the meal planner and the full exercise library.

Checkout opens at launch

Beta access

Got a code? Testers get it free while it's being put through its paces. In return, report anything that breaks or confuses you.

That code isn't right. Check the code you were sent.
Download · 3.7 MB

Download this on a computer, not your phone. Setup happens there; your phone gets the finished app at the end. Then open install.html inside the zip.