CertBox

Looking for a Gas Engineer Software alternative?

Gas Engineer Software is well-liked, gas-specialist software. If you’re heating-only and happy, it serves you well. The CertBox case is simple: unlimited certificates filled in for £0 and £14.99/month flat to hand them over, instead of £19+/user/month, invoicing included free instead of from the £25 Core tier, and one app that also covers electrical, fire safety and plumbing work.

What each costs

CertBox Free£0 - fill in unlimited certificates; quotes, invoices & payments
CertBox Pro£14.99/mo flat (£119/yr) - whole team included
Gas Engineer Software Starter£19/user/mo (£18 annual) - Records & certificates
Gas Engineer Software Core£25/user/mo (£23 annual) - Adds quoting, invoicing, reminders, accounting integrations
Gas Engineer Software Pro£32/user/mo (£30 annual) - Adds custom reporting, AI quoting and invoicing

GES includes certificates on all plans. The cheapest is £19 per user per month (£18 on annual billing). Prices exclude VAT. Gas Engineer Software prices read from their public pricing page on 11 September 2026. Check it yourself: if it has changed, tell us and we will correct this page.

What that means per year

Sole trader, certs only

GES Starter: £216–£228/year · CertBox Free: £0

Sole trader, certs + quoting + invoicing

GES Core: £276–£300/year · CertBox Free: £0 (or Pro £119/year with branding + auto reminders)

Why people switch

  • Fill in unlimited certificates on the CertBox free plan; GES starts at £19/user/month.
  • Quoting, invoicing and card payments are free in CertBox; GES includes them from the £25 Core tier.
  • One app for every trade you work in: CertBox covers gas, electrical (including EICRs), fire safety and plumbing. GES is gas, oil and heating only.

Where Gas Engineer Software is stronger

An honest comparison cuts both ways. Stay with Gas Engineer Software if these matter to you:

  • A decade-plus of gas-specialist focus, with depth in heating-trade record types.
  • Accounting integrations from the £25 Core tier (CertBox does not connect to accounting software).
  • A UK-based phone support team.
  • A good fit if you only work in gas, oil and heating and don’t need other trades covered.

Switching takes an afternoon, not a weekend

1. Export your clients from Gas Engineer Software as a CSV.

2. Import it in CertBox: Clients → Import CSV. Match your columns to ours: any export format works.

3. Or skip both steps: email the export to paddy@certbox.app and the founder sets your account up for you, usually within a day.

And if CertBox isn’t for you, everything exports back out. Read the CertBox data promise.

Common questions

Try it with a real certificate, free, no card