Best CP12 certificate apps for UK gas engineers (2026)

Apps for filling in landlord gas safety records (CP12/LGSR), service records and other gas paperwork on site, then emailing the PDF before you leave.

9 options compared. Sorted by lowest starting price. Last checked 20 Oct 2026. We have not been paid by any vendor on this page.

Quick answer: The lowest paid starting price we verified is GasPro (from £7.99/mo). Cheapest isn't always best. Check the points below before you pick.

Side by side

Tool	Starting price	Free trial	Suits	Checked
GasPro £7.99/mo or £79.99/yr for the first engineer; extra engineers £5.99/mo or £59.99/yr each.	from £7.99/mo	14 days, no card	sole trader, small firm	20 Oct 2026
Checker (formerly Gas Checker) Lite £10.99/mo (£109.99/yr); Pro £19.99/mo (£199.99/yr); Pro+ £25.99/mo (£259.99/yr) plus £10.99/mo per sub-user. All + VAT.	from £10.99/mo	30 days, no card	sole trader, small firm	20 Oct 2026
Manifold From £15 per user per month + VAT (introductory early-access rate).	from £15/mo	30 days, no card	sole trader, small firm	20 Oct 2026
Gas Engineer Software (GES) Starter £19/user/mo monthly (£18 on annual); Core £25 (£23 annual); Pro £32 (£30 annual). Ex VAT.	from £18/mo	Yes (length not stated on pricing page)	sole trader, small firm	20 Oct 2026
OnPoint £19/mo for the first seat (founding price) plus £9/mo per extra person; or £228/yr + £108/yr per extra person. Vendor says it is not VAT registered.	from £19/mo	14 days, no card	sole trader, small firm	20 Oct 2026
Gas Certificate App £20 + VAT per user per month, or £216 + VAT per user per year. One plan, no feature tiers.	from £20/mo	14 days, no card	sole trader, small firm	20 Oct 2026
Gas Cert (by iCertifi) GasCert: £24.99 a month or £149 for 12 months; Enterprise £490 for 12 months. Prices include VAT and are billed through the App Store.	from £24.99/mo	Free 2-week trial	sole trader, small firm	20 Oct 2026
Maintivo Pro £34.99/mo for the owner; engineer seats from £8.99/mo (packs of 1, 3 or 5); optional invoicing +£9.99/mo.	from £34.99/mo	First report free	sole trader, small firm	20 Oct 2026
Easy Safety Cert (GasCert / PatCert) Pay as you go: £25 plus VAT for 50 jobs per year (the default option on the pricing page), with larger job bundles available. No annual subscription or tie-ins.	£25 + VAT for 50 jobs/yr	Free trial offered	sole trader	20 Oct 2026

Head-to-head comparisons

How to choose

Check it has every form you issue (CP12, warning notice, service record, commissioning, tightness test).
Check it works offline: plant rooms and cellars have no signal.
Look at the per-user price if you will add engineers later.
Check whether reminders and invoicing are on the cheapest plan or only higher tiers.

Good starting points for sole traders

GasPro: from £7.99/mo. Gas certificates incl. CP12.
Checker (formerly Gas Checker): from £10.99/mo. Unlimited certificates on every plan (gas, oil, electrical, renewables).
Manifold: from £15/mo. Digital CP12s.
Gas Engineer Software (GES): from £18/mo. CP12 / landlord gas safety records.
OnPoint: from £19/mo. Landlord gas safety records (CP12) validated as you fill them in.

Prices are as shown on each vendor's own pricing page on the date in the table, usually excluding VAT. "Price on vendor's site" means the vendor doesn't publish a price or we couldn't confirm one, so we don't show a figure. Spotted a change? Report it.

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