Want to know about Checker app and how it’s changing the game for engineers and tradespeople?
At Checker App (formerly Gas Checker), we make life simpler for professionals across the UK and Ireland. Our powerful all-in-one platform helps you manage certificates, records & reports (digital paperwork), jobs, and customer relationships – without the hassle.
Built by engineers, for engineers, Checker streamlines the way you work. No more endless paperwork – just smarter business management. Whether you’re in Heating, Gas, Plumbing, Electrical, Renewables, or Oil Heating, Checker keeps you compliant, organised, and ahead of the competition.
Thousands of engineers and businesss trust Checker every day to save time, cut admin, and win more business.
Download Checker now on Google Play or the AppStore.
See how professionals leverage Checker to save time, reduce costs, and increase productivity.
Mark, one of our many users, relies on Checker to streamline his entire workflow.
He creates work records and reports directly in the app, instantly converts them into invoices with a single click, and sends them to customers via email or text. Payments are taken seamlessly through Checker’s Zettle Chip & Pin integration, with all transactions automatically synced to his Xero accounting software for accurate financial reporting and annual accounts.
The result: a simplified process, significant time savings, and improved business efficiency.
Launched Gas Checker (now Checker) launched in 2012 from a pipe dream from one man — A Gas engineer who wanted to use the growing popularity of smart phones and tablets and use that to help him grow and operate his plumbing business more smoothly.
Gas Checker grew significantly within the first few years allowing us to re invest in the software and even more tools and features to help engineers.
in 2025 Gas Checker became Checker and after a 2 year re-build from scratch launched into the electrical, renewable energy and air-con/refrigeration sectors with a brand new iOS , Android and Web app.
No pre-payment necessary, just register and get 30 days of use absolutely free.
We’ve come along way as a software provider over the last few years and our plan is to continue to grow the software, adding more features, more sectors and helping even more Plumbers, Heating Engineers, Electricians and Renewable Energy Installers run and grow their business.
8900
2021
10768
2022
13897
2023
16.344
2024
19.000
2025
