Coinbramble is open to the first people on the waitlist

This is the first build we have let anyone else use. It does one thing from end to end: you photograph a receipt, give it a category, and the week's total changes. Everything else we wanted to build is waiting behind that.

What is in this build

• A weekly budget you set once, in one currency.

• Receipt photos, kept with the entry they belong to.

• Eight categories to start with, and room to add your own.

• A week that starts on Monday and does not roll over.

• The same build on iPhone and Android.

The camera screen in the screenshots on this site is still a wireframe. It works, it just has not been drawn yet, and we would rather show you the grey boxes than a picture of a screen that does not exist.

We are letting a few people in from the waitlist every Monday, and we read every reply to the welcome email. If something in the week's arithmetic does not match your receipts, tell us that first — it is the part everything else rests on.