Eight apps gas engineers invoice with, compared on what each one publishes: the price, which plan invoices, how a customer pays by card, the card fee and the accounts sync. Gas-first apps raise the invoice from the certificate; Xero is the accounts alone. We build Manifold, so it comes last.
Prices run from a free plan for 30 jobs a month to £44 per user a month. Every app here sends invoices; they differ on whether the customer can pay by card from the invoice, and on which plan syncs to your accounts. Each price is shown the way its vendor states VAT.
| Software | Published price | Invoicing | Card payments | Accounts sync |
|---|---|---|---|---|
| Gas Engineer Software | £23 per user a month for the plan with invoicing in its pricing FAQ (its calculator shows £25 billed monthly), plus VAT | On its middle and top plans; the entry plan is certificates and jobs | Not stated. Invoices carry a Crezco open banking link and QR code, a flat £1 per invoice | Xero, QuickBooks and Sage on its top plan, £30 per user a month |
| Gas Certificate App | £20 per user a month, or £216 a year, plus VAT | Included: one plan with no feature tiers | Not stated: invoices are marked paid or unpaid | A direct QuickBooks connection; an export for Xero |
| Checker | £10.99, £19.99 or £25.99 a month per account, plus VAT | Every plan | A Zettle card reader on every plan (Zettle's fees), and a Stripe pay-now link in beta on the web app | Xero, QuickBooks and Sage, two-way; its pricing table puts them on the two higher plans |
| Tradify | £34, £37 or £44 per user a month (VAT not stated) | Every plan, with online card payments | Tradify Credit Card Payments: 20p plus 1.7% on standard cards, VAT included | Xero, Sage and QuickBooks Online on every plan |
| Powered Now | £28 a month for one user, or £32 or £40 per user a month, plus VAT; two months free on yearly billing | Every plan, with payment links | SumUp, by payment link or a mobile card reader; fee not stated | Xero and QuickBooks Online on the two per-user plans |
| ServiceM8 | Free for 30 jobs a month, then £25, £59, £119 or £269 a month by job volume, unlimited users, plus VAT | Every plan, the free one included | ServiceM8 Pay, powered by Stripe: 1.70% plus 20p on standard UK cards; Tap to Pay on iPhone | Xero, QuickBooks Online and MYOB on every plan |
| Xero | £7 if not VAT registered, otherwise £18, £39, £55 or £70 a month, plus VAT; 90% off the first 6 months for new customers | 10 invoices on the £7 plan and 20 on the £18 plan (period not stated); no limit stated above that | Stripe: 1.5% plus 20p on standard UK cards, plus VAT; GoCardless for direct debit | It is the accounts package |
| Manifoldour product | £15, £20 or £25 per user a month, plus VAT, billed monthly | Every plan: the invoice is raised from the job | A card payment request against a quote, into your own Stripe account, on Growth and above | Xero, QuickBooks Online and Sage on Growth and above |
About 1.5% to 1.7% plus 20p on a standard UK card, where the vendor publishes a rate. On a £90 service that is roughly £1.55 to £1.73. Premium and business cards cost more, and only some vendors say whether VAT is on top.
| Software | Provider | Standard UK card | Premium UK card | VAT | Payout |
|---|---|---|---|---|---|
| Tradify | Tradify Credit Card Payments | 1.7% plus 20p | 2.1% plus 20p | Included | 7 days for the first, then 3 days |
| ServiceM8 | ServiceM8 Pay (Stripe) | 1.70% plus 20p | 2.10% plus 20p | Not stated | Next business day |
| Xero | Stripe | 1.5% plus 20p | 1.9% plus 20p | Excluded | Not stated |
| Checker | Stripe link (beta) | 1.5% plus 20p | 1.9% plus 20p | Not stated | Not stated |
| Gas Engineer Software | Crezco (pay by bank, not card) | £1 per invoice | Not applicable | Not stated | Not stated |
Comparing card readers rather than software? See the best card readers for gas engineers and how to take card payments as a gas engineer.
Gas Engineer Software, Gas Certificate App and Checker start from the certificate and add the invoice, the shortest route from a CP12 to a bill on the same visit.
Stands out: One tap turns an accepted quote into an invoice, and the customer pays from their banking app with no card reader.
Worth knowing: Its FAQ and its price calculator give different figures for the invoicing plan, and neither says which is the yearly rate. The pages we read mention no card payments.
Stands out: An invoice can be created straight from a certificate or converted from a quote, with payment reminders and VAT worked out, all on its one price.
Worth knowing: The pages we read name no way for a customer to pay by card or link, and Xero gets an export rather than a live sync.
Stands out: Finish the certificate and one tap copies its lines onto an invoice. Checker takes no commission on card payments.
Worth knowing: The price is per account, with extra users on the top plan only. Its pricing table says the cheapest plan has no accounts sync; its integrations page says every plan does.
Tradify, Powered Now and ServiceM8 run the diary, quotes and invoices for several trades, with card payments built in; gas certificates sit on their higher plans.
Stands out: Progress invoicing and quote and invoice reminders on its middle plan, bulk invoicing on the top one, and the choice to absorb the card fee or pass it on.
Worth knowing: Gas certificates are not on the cheapest plan. The first card payout arrives 7 days after payment, then 3 days after.
Stands out: Quotes and invoices can be prepared with no signal, SumUp pays out the next working day, and Making Tax Digital for Income Tax is on every plan.
Worth knowing: Certificates and the accounts sync are not on the single-user plan, so a gas engineer working alone pays the per-user price to get them.
Stands out: Priced by jobs, not people, so a team shares one plan. Deposits on every plan, progress invoices from its £25 plan, and card payouts the next business day.
Worth knowing: No gas safety record is named on the pages we read, and its pay page does not say whether the card fees include VAT.
Xero sends invoices and takes card payments, and it keeps the books Making Tax Digital needs, but it holds no jobs or certificates.
Stands out: Tap to Pay in its mobile app at 1.4% plus 20p, Pay by Bank at 0.5% plus 20p capped at £5, and its pricing page lists every plan as ready for Making Tax Digital for Income Tax.
Worth knowing: No jobs, certificates or renewal reminders, so it runs alongside a certificate app rather than replacing one. Its invoicing page calls MTD for Income Tax a beta.
Manifold is a gas-only app that raises the invoice from the job the CP12 belongs to, priced per user with a 30 day free trial, and it is newer than everything above.
Stands out: The invoice comes out of the same job as the CP12. Bank transfers, cash and a letting agent's remittance are recorded against it, and each issued invoice and the payments against it go to your accounts package.
Worth knowing: Card payments are requested against a quote, as a deposit or the balance, rather than sent on the invoice itself. It's in early access, with no reviews and no App Store or Google Play listing, and it covers gas records only.
Details reflect each product as described on its own website on 1 October 2026. Prices and fees change, so check the vendor’s site before you decide. Choosing certificate software too? See the best gas certificate software. Gas safety work must be carried out by an appropriately Gas Safe registered engineer.
Every figure on this page was read from these documents on 1 October 2026.