Heather grouse moor under a pale sky in the east of Scotland
A grouse moor, Scotland
Gamekeeper Pro sign-in screen on a dark green tartan
gamekeeper.booyaai.com
Hardness Map on a phone
hardnessmap.com on a phone
Last Posting Date in German
lastpostingdate.com/de
Last Posting Date showing post by 16 December for a UK parcel
lastpostingdate.com
A red pillar box against a painted wall in Kentish Town
A pillar box, Kentish Town
Gamekeeper Pro on a phone
Gamekeeper Pro on a phone
An old Christmas post office van decorated with holly, Washington DC

Booya

Small, useful apps, each at its own address.

Planned by a person, built by one AI, checked by another with real tests.

See the three apps
Hardness Map in Spanish
hardnessmap.com/es
Last Posting Date on a phone
Last Posting Date on a phone
Flakes of limescale taken out of a kettle
Limescale from a kettle
Hardness Map home page with a city search and a map
hardnessmap.com
The green tartan behind the Gamekeeper Pro sign-in
Gamekeeper's tartan
Where gamekeepers work
Gamekeeper Pro sign-in
Gamekeeper Pro2026
Gamekeeper Pro on a phone
On a phone2026

gamekeeper.booyaai.com

Gamekeeper Pro

A compliance and management companion for British gamekeepers. Records, rules and alerts for the shoot, kept in one place on the phone.

Open Gamekeeper ProIn testing. Sign-in by invitation.

lastpostingdate.com

Last Posting Date

Tells you the last day to post a card or parcel so it arrives by Christmas, with a few days spare for delays. In English and German.

Last Posting Date showing post by 16 December
Last Posting Date2026
Last Posting Date on a phone
On a phone2026
Hardness Map on a phone
On a phone2026

hardnessmap.com

Hardness Map

How hard the tap water is in cities across Germany, Spain and Mexico, and what that means for your kettle and washing machine. Every value shows its source and date.

Open Hardness MapLive in four languages.
Hardness Map in Spanish
Hardness Map, Spanish2026

Name your app

Every app gets an address that says what it does. Type what yours would do and see where it would live.

your-app.booyaai.com

Ask for this app

Opens an email to Jonathan with the address and your idea filled in.

How an app gets its address

“Will it arrive by Christmas?”

Asked

Each app starts as one plain question. Jonathan writes the plan and agrees it before anything is built.

The built Last Posting Date app on a phone

Built, then checked

One AI builds it. A different AI inspects it with real tests, and any failure goes back to the builder.

Last Posting Date live at its own address

Given an address

It goes live at its own address. Test apps stay hidden from search engines until they are ready.

Questions

What is Booya?

Booya is the build line behind these apps. A plan goes in, one AI builds the app, a different AI checks it with real tests, and only an app that passes goes out.

The name is the shout you give when something works.

Who makes the apps?

Jonathan Knowles, in Harrogate, England. He decides what gets built and approves every plan. More about him at jonathanhere.com.

Why does each app get its own address?

So the address says what the app does. A new app can go live the same day at name.booyaai.com, without buying a domain.

When an app becomes a product it can move to a domain of its own, as Last Posting Date and Hardness Map did.

Can I use the apps?

Last Posting Date and Hardness Map are free and open to everyone. Gamekeeper Pro is in testing, and sign-in is by invitation for now.

Why can't I find the test apps on Google?

Test apps are marked so search engines skip them, which keeps unfinished work out of search results. When an app is ready, the mark comes off.

I had a link to Gamekeeper on booyaai.com

That link still works. Old Gamekeeper links on booyaai.com now forward to gamekeeper.booyaai.com.

Can you build an app for me?

Send the idea in one sentence with the name your app box, or email Jonathan directly. Small, useful tools are the best fit.