Bookso vs Gas Engineer Software: which fits your gas business?

If what you need is digital CP12s and LGSRs, warning notices, service records and the rest of the gas paperwork done properly on your phone, GES is exactly that tool. It's built by people who know the trade, the certificates match what Gas Safe and landlords expect, and it saves you the pain of paper pads and PDFs stitched together at the end of the day. Bookso doesn't compete with that and isn't trying to.

If you're also using it for quoting, invoicing and keeping job history against each customer, that's a real workflow win - one place for the operational side of a gas engineering business. Trades who feel the pain of paperwork more than the pain of rebooking usually get more value from GES first.

Bookso is built around one job that certificate-and-paperwork tools don't do especially well: closing the rebooking loop. When a customer's boiler service or CP12 is coming due, Bookso emails them from your business name with a one-tap booking link. They pick a slot, the job lands in your diary as a confirmed booking, and you get notified. If they ignore the first email a chaser goes out automatically, and on paid plans one SMS follow-up too.

Because Bookso does only that, it's cheap and fast to set up: £14.99/month on Pro for unlimited customers, no per-user fees, no contract, running in about 5 minutes. A free tier covers your first 5 customers so you can try it on a handful of regulars first.

It also works across trades, not just gas - useful if you do a bit of plumbing on the side, or you'd like the same rebooking approach for landlord annual checks that aren't strictly CP12 work. And crucially, it's designed to sit alongside a tool like GES rather than replace it: GES runs the certificate, Bookso brings the next one in.

Yes, and it's a very common shape for a gas engineer's toolkit. GES (or a similar certs-and-paperwork app) handles the CP12s, invoicing and job records; Bookso sits on the customer side and handles the rebooking. The two don't step on each other - GES runs the job, Bookso brings the next one in.

There's no direct integration today. In practice you'd add the customer to Bookso when you complete the job in GES, set the service interval (usually 12 months for a boiler service or landlord CP12), and let Bookso handle the reminder and the booking link 11 months later. For a lot of solo and small-firm gas engineers that combination gives them the full workflow at a small extra fixed cost.

The honest headline is that Bookso and Gas Engineer Software aren't really competing for the same slot on your phone. GES is a paperwork platform - if the pain in your week is CP12s, LGSRs, invoices and keeping job records straight, that's the pain it solves, and it solves it well. Bookso is a rebooking platform - if the pain is watching last year's boiler service customers quietly disappear because nobody reminded them their next one was due, that's the pain Bookso solves.

So the right question isn't 'which is better' - it's 'which pain is bigger for you right now?' A one-person gas engineer with a solid book of repeat CP12 customers who's happy with their current paperwork often gets more value from Bookso first. A firm drowning in certificates and invoices usually gets more value from GES first. Neither is wrong; they're different jobs.

The pricing shape reflects that too. Certificate and job-management tools are typically priced per user because they scale with the size of your team. Bookso is priced per business because it scales with your customer list, not your headcount - free for the first 5 customers, £14.99/month on Pro for unlimited customers, £44.99/month on Business if you need a small team. That's why plenty of gas engineers who already pay for GES still add Bookso: it's a small fixed cost that plugs the one gap the certs tool doesn't cover.