Flint

OnSpec Software

About this app

Every boiler's service intelligence in your pocket.

Flint puts manuals, fault codes and structured service data for 1,000+ UK boiler models one search away — built for Gas Safe engineers who need answers on site, not after a trawl through PDFs.

FIND THE BOILER FAST
Search by model name, range or GC number. Recent boilers stay one tap away.

FAULT CODES THAT EXPLAIN THEMSELVES
50,000+ fault codes with plain-English causes, severity and the parts commonly replaced.

THE ACTUAL MANUAL
The manufacturer's installation & service manual, in-app and searchable.

SERVICE DATA AT A GLANCE
Combustion targets with tolerances (CO₂, CO/CO₂ ratio), gas pressures, service-mode steps, technical data and spec sheets — extracted from the manual, with page references.

TOOLS BUILT FOR THE JOB
Gas rate calculator with built-in stopwatch, combustion ratio, temperature rise, expansion vessel sizing, and manufacturer helplines.

FLINT PRO — YOUR AI ONSITE GUIDE
Ask any boiler a question and get answers grounded in its own manual, with page citations. Fault-finding, checks and servicing. £4.99/month or £49/year, cancel anytime.

Flint is reference software for competent professionals: always verify against the manufacturer's current documentation and work within your competence and Gas Safe registration.

Free account (verified email) opens all manuals. From OnSpec Software Ltd.

What’s new

First release.

• Search 1,000+ UK boilers by model, range or GC number
• 50,000+ fault codes in plain English, with likely causes and parts
• The manufacturer's own manual, in-app and searchable
• Service data with page references: combustion targets and tolerances, gas pressures, service mode
• Gas rate calculator with built-in stopwatch, plus combustion ratio, temp rise and expansion vessel tools
• Flint Pro: ask any boiler a question, answered from its own manual with page citations