You've been invited · founding engineers

Your 60 days of Flint Pro, on us.

Flint Pro is the bit that does the thinking: ask any boiler a question and get an answer straight off its own manual, page and all, plus the full service figures for 950+ gas boilers. This code unlocks it free for 60 days. No card. Nothing to cancel.

Your codeFLINT60

Create your free account

Takes about a minute. No payment details, ever, for the free 60 days.

What Pro unlocks

Not a chatbot. The manual, answering back.

Ask any boiler, grounded in its manualAsk a fault, or how to fix a code, and get a step-by-step answer pulled from that exact model's manual, with the page cited so you can check it.

Every service figure, per modelCombustion targets at max and min rate, gas pressures, service mode, sensor values, straight from the book, not a generic rule of thumb.

The free stuff stays freeManuals, fault codes, helplines and the four calculators are free for good. Pro just adds the AI and the deep data. After 60 days you drop back to free, no charge.

Flint's Service Info screen: CO2 max/min, CO/CO2 ratio and CO commissioning vs service limits for a Worcester Greenstar 8000, each citing manual page 51.

Redeem your 60 days

Three steps, about a minute.

You redeem on the web (it works whatever phone you carry), then the same login works in the app.

Create your free account

Head to app.flintfix.com and sign up with your email. Works in any browser, on your phone or a laptop.

Open Account → Redeem

Tap your account, choose Redeem, and enter FLINT60. It's not case-sensitive, so flint60 is fine on a phone.

You're on Pro for 60 days

The AI and the full service data unlock straight away. Sign in with the same account in the iPhone or Android app and it carries across.

Start — create your account

Then put it in your pocket

Get the app on your phone.

Get it onGoogle Play Download on theApp Store

Prefer the browser? Open Flint at app.flintfix.com

The small print, plainly

No card, nothing to cancel. Pro is free for 60 days, then it simply reverts to the free app. Because you never enter payment details, nothing charges when the 60 days end.

Fair-use cap. The free trial covers up to around 75 questions to the AI across the 60 days, which is plenty for real jobs. Everything else in Pro is unlimited.

One account, every device. Redeem once on the web and the same login unlocks Pro in the iPhone app, the Android app and the browser.

Flint is a reference tool for competent, registered gas engineers. Its answers inform your judgement; they never replace it, and every figure should be checked against the manufacturer's manual and the data badge.