Gas Engineer Software Alternatives: Where to Go When You Leave GES [2026]

Gas Engineer Software has been around since 2012, says more than 7,000 UK heating businesses use it, and is very good at certificates. If you’re thinking of leaving, the CP12 probably isn’t the problem. More likely it’s something around it: the plan structure, the missing invoicing on Starter, or the wait for its AI. Your reason for leaving decides where you should go, so this guide is sorted by reason. For a straight ranking of every gas certificate app, read our best gas engineer software guide instead.

We make one of the alternatives below, so read our section with that in mind, and each section says where that product falls short. Every price comes from the provider’s own website, checked in late October 2026, and excludes VAT unless the provider doesn’t say.

The quick answer

Checker (from £10.99 a month) is the closest certificate-first app for less money. Gas Certificate App (£18 per user a month, billed annually) costs the same as GES Starter but puts invoicing, the diary and service reminders on its one plan.

Mucka (free to start, then £29 a month solo or £39 per user for a team) is the move if you want the AI and the phone answered now, F-Gas records, and accounts sync on every paid plan, and it has an importer built for GES.

Powered Now covers gas and electrical certificates together. Commusoft and Joblogic suit firms growing into commercial contract work, and Tradify suits a multi-trade team.

What GES does well, and where it stops

GES has 20 record types covering domestic and non-domestic gas, LPG, catering, the OFTEC oil forms, a heat pump service record, Legionella, minor electrical works and unvented cylinders. Readings come in from Kane, Anton and TPI analysers over Bluetooth, more than 2,300 boiler manuals live in the app, and it works fully offline.

The limits are mostly in the plans. Starter (£18 a month billed annually) is for a single engineer and has no invoicing or service reminders; those start on Core, from £23 per user. AI quoting, AI invoicing and Boiler AI Assist sit on Pro (£30 per user, billed annually) and are still in beta, as is Xero, QuickBooks and Sage sync. Its AI receptionist is listed as coming soon, and there are no F-Gas records.

The alternatives at a glance

Software	From	Best if you’re leaving GES because	Analyser link	F-Gas
Mucka	Free, then £29	You want AI, the phone answered and F-Gas	No	Yes
Checker	£10.99	It costs too much for a sole trader	Kane	Yes
Gas Certificate App	£18 per user	Starter has no invoicing or reminders	Testo, TPI, Sauermann	Not named
Powered Now	£23 (one user)	You need electrical certificates too	Not stated	Not named
Commusoft	Quote only	You’re growing into commercial contracts	Not stated	Not named
Joblogic	£49 per user*	You’re growing into commercial contracts	Not stated	Yes
Tradify	£34 per user*	You run a multi-trade team	Not stated	No

Prices are per month and ex VAT; Gas Certificate App, Powered Now and Joblogic are on annual billing. *VAT not stated by the provider.

If you want the AI and the phone answered now: Mucka

This one is ours. Mucka is job management for heating, plumbing and HVAC firms, built around an AI engine that watches your jobs, engineers, diary and money and drafts whatever needs doing for you to approve with one tap. Nothing goes to a customer until you say so.

Where GES has its AI as a Pro-only beta and its receptionist marked coming soon, Mucka’s engine and its AI phone receptionist are on every paid plan now. The receptionist answers in your business name, pencils jobs in for you to approve and flags a gas smell straight away. Xero, QuickBooks, Sage and FreeAgent sync are on every paid plan too.

The certificates cover the CP12, warning notice, service and breakdown records, gas testing and purging, commissioning, catering and unvented records, LPG and non-domestic records, all five OFTEC oil forms, five F-Gas records, heat pump records and Legionella. You can scan the boiler’s data plate and the analyser screen instead of typing, and it all works with no signal. Each certificate’s next-check date feeds your service reminders.

Coming off GES, the importer brings the customer book, every property, the appliance register with next service dates, the renewal dates behind your reminders, and every certificate as its original signed PDF. Old invoices and quotes come as the original documents. GES’s standard export has no job history or diary, so ask GES for the diary by name; with your email connected, Mucka will write that request and send it from your own address when you say yes.

Where it falls short: no Bluetooth analyser link and no boiler manual library, both of which GES has. No electrical certificates, and certificates aren’t on the free plan.

Price: free plan for quotes and invoices; £29 a month for a solo owner, £39 per user for a team, apprentices £19, subcontractors free. 14-day free trial of everything, no card, no contract.

If it costs too much for a sole trader: Checker

Checker, which used to be called Gas Checker, is the closest like-for-like move. Every plan includes unlimited records: CP12s, service and breakdown records, OFTEC oil forms, F-Gas commissioning and leak testing, heat pump and solar thermal records, and electrical certificates. Forms work with no signal, readings come in from a Kane analyser over Bluetooth, and there’s an offline boiler manual library.

Lite is £10.99 a month but has no service reminders, CRM or accounts sync. Pro (£19.99 a month) adds reminders and Xero, QuickBooks and Sage, and Pro+ (£25.99 a month) is the team plan. We found no AI features on its site.

Price: £10.99 to £25.99 a month plus VAT, or yearly from £109.99. Free trial, no card.

If Starter has no invoicing or reminders: Gas Certificate App

Gas Certificate App, from UK company Trade Apps, has one plan, and every user gets all of it: certificates, the job diary, quotes and invoices, service reminders by email or text, and the desktop version for the office. At £18 a month billed annually that matches GES Starter, which has none of the extras. Its record list runs from landlord gas safety records and OFTEC oil forms to heat pump, Powerflush and caravan and boat records, and readings come in from Testo, TPI and Sauermann analysers.

Offline mode is for new certificates on a phone or tablet, switched on before you lose signal. QuickBooks syncs directly but Xero is an export, text reminders use credits bought separately, and we found no F-Gas records or AI features on its site.

Price: £20 per user a month, or £216 per user a year (£18 a month), plus VAT. The same price for engineers and office staff. 14-day trial, no card.

If you need electrical certificates too: Powered Now

GES stops at minor electrical works. Powered Now has more than 80 forms and certificates covering gas and electrical, EICRs included, plus quotes, invoices, MTD and VAT returns, and the app works offline. Certificates and Xero or QuickBooks sync start on Professional, and its PN Receptionist is an add-on from £29 a month.

Price: Business £280 a year for one user (no certificates), Professional £320 per user a year, Premium £400 per user a year, plus VAT. 14-day trial, no card.

If you’re growing into commercial contracts: Commusoft or Joblogic

Commusoft and Joblogic are full field service platforms with service contracts, planned maintenance and SLA tracking that GES doesn’t attempt. Both do gas safety records and work offline.

Commusoft publishes no price, says it is designed for six staff or more and runs its standard plans on a 12-month contract. Joblogic is from £49 per user a month billed annually, has F-Gas refrigerant tracking and PartsArena parts data, and says most customers sign for 24 or 36 months. If you’re comparing those two, our Commusoft alternatives guide goes further.

If you run a multi-trade team: Tradify

Tradify is a general job manager with timesheets, job costing and Xero, QuickBooks and Sage sync on every plan, plus purchase orders on Plus. From Pro it has landlord and homeowner gas safety records, warning notices, boiler records and the OFTEC oil forms. There are no F-Gas or heat pump records, and service reminders and the AI tools are Plus-only.

Price: Lite £34, Pro £37, Plus £44 per user a month. VAT not stated. 14-day trial.

When to stay on GES

Stay if your day is certificates end to end and you lean on the Bluetooth analyser link and the boiler manuals. Checker and Gas Certificate App come closest there. The rest give up some certificate depth in exchange for job management, AI or commercial contract tools.

Before you cancel, get your data out: ask GES for the diary and job history by name, because the standard export leaves them out, and fill in a live CP12 in the new app before you move your customers over.