Pricing

Free to start.
One plan when you're ready.

No trials that expire, no features that quietly move behind a bigger tier. The free tools stay free.

Free

£0

Start a Diagnosis: Symptom-led fault finding, free once — all the way to a verdict
Fault Code Wizard: Your code and your model — then the maker's own chart, one question at a time
Enthalpy Chart: Plot the cycle on a real P-h chart — any of 12 refrigerants
Refrigerant Converter: Pressure ↔ temperature, any blend — and what replaces the gas on the plate
AC Size Calculator: Room cooling load → the right unit size
Power Calculator: Volts and amps to real kW — and why they're not the same
Pressure Test Checker: Did it hold, or did it just get cold? Ambient-corrected
Thermistor Converter: Meter reading → temperature. Is the sensor lying?
Indirect Leak Check: Prove the charge from performance alone — the 23-point sheet computed live, your readings drawn on the chart, saved straight to the job
Engineer Guides: New to fault-finding? The physics, plain and free
Test Yourself: Quiz: fundamentals, would-you-condemn-it, beat the clock. Wrong = pressure up
The diagnosis demo: the real tool on a sample unit

Try the diagnosis

Pro

Plans in the App Store

£9.99/mo

launch rate · or £99/yr

The launch rate is locked for as long as you stay subscribed — it never rises while you're in. After launch, new sign-ups pay £14.99/mo or £139.99/yr; anyone already on the launch rate keeps it.

Measurements: your readings on a live P-h chart, with a verdict
Guided investigation: starts from the symptom, decides the next check
2,250+ fault codes across 28 makes, 1,000+ with a step-by-step flow
Reference: the raw tables. Codes, specs, controller access
Charge calculator: additional refrigerant by pipe run
Heat loss & radiator sizing: whole house or room by room, at your flow temp
Every job remembers what the fault actually turned out to be
Job packs, service reports and commissioning certificates on your branding
Quotes and invoices: priced on site, and the quote becomes the job
Tightness test records and waste transfer notes for the compliance file
F-Gas register with CSV export: tCO₂e worked out, leak-check threshold flagged

Create your free account

Cancel any time from the app. Payments by Stripe.

Cancel any time in your App Store settings.

Business

Coming soon

Planned maintenance and a proper customer file — whether that is you on your own or a team. One subscription for the whole firm, priced per engineer. Not ready yet — tell us where to find you and we’ll let you know when it is, and what it costs.

Maintenance plans — the visits held for you, and the agreement on the job pack
Every customer's full history in one file, and who to chase next
Everything in Pro, for everyone who works for you
Engineer logins when you take somebody on — they see their own jobs, not your money

We'll only use this to tell you when Business is ready.