Master Gas is a new way to manage your gas business, making your working day more productive. So goodbye to paperwork, everything is handled in the app, no more hand written forms, scraps of paper and losing customer details. Here are some of the features

• Appointment Diary
Keep track of your customer appointments with a built-in diary with fast address lookup.

• Customer Database
Keep track of all your customers in one place. Store all contact information, past job history and important reminders for each of your customers and landlords.

• Gas Certificates and Forms
You can create professional Landlord Gas Safety Records (CP12), Maintenance forms, Jobsheets, Warning Notices, Breakdown Reports and Non-Domestic documents. Installation Commissioning, Oil CD10, Oil CD11, Legionella Risk Assessment and more.

• Invoicing
Get paid quickly with the built-in invoice tool. Create invoices, then print or email to the customer. No more waiting for payment, no more stamps, no more lost cheques.

• Estimates and Quotes
Create estimates and quotes for you customers from the App. Select from previous stock items or create ad-hoc new items. You can even copy the Estimate/Quote over to an invoice to save time.

• Purchase Orders
Send your suppliers a purchase order.

• Track Expenses
Keep track of your expenses on the go. It will cut down on sorting receipts for the Tax Return and your accountant will love it too.

• Record Mileage
Log down your mileage as you go. At the end of the year you will need this for your accountant. It could save you a small fortune!

• Customisable
You can add and change any of the lookup lists to suit your needs, add your own logo to the reports and certificates.

• Email
Email any of the gas forms, invoices or reminder letters from the app to your customer. This means you get all the documents to your customer quickly, leaving no delays for payment making your cashflow a pleasure. You can even email the same documents to yourself with an “Always CC” setting in the app.

• Printing
Print any of the gas forms, invoices, reminder letters or expense records from the app to an AirPrint printer.

• Dropbox integration
We have integrated with Dropbox, so you can upload all your documents to dropbox and access these on your computer. This feature works well if you want to batch print on your office computer.

• Dedicated Support Team
We have a dedicated support team waiting to answer your questions and help you when you need it.

We work really hard to make this app useful for you. We value any feedback you have and will try to accommodate as many ideas as possible. If you have a question please contact us, we are always pleased to receive your feedback.

What’s New

Version 2.9.8

- Signatures and Logo on Jobsheets

Ratings and Reviews

4.1 out of 5
50 Ratings

50 Ratings

Gemcass ,

Great App but needs updating

I have the upgraded version and contacted Master Gas about the App freezing whenever I go to the Help Centre on my IPad. It’s says loading then freezes, but this has still not been resolved?

If like me you cannot always take your device onto a site and need to fill out the certificate at a later date, you cannot change the inspection date. You must open the certificate on that day and if you don’t the inspection date cannot be changed although you can change the sign off date of both customer and engineer?

You have to be carful about the number of characters you use were ever you detail actions work or defects. There is no character limit so you can type what ever you want but it will not all show on the certificate. This is annoying and can be potentially used against you by your customer as specifics of your recommendations can easily be missed off. Especially if like me you itemise your comments. Why doesn’t the box expand to match character count. The attached number of sheets to a certificate doesn’t matter. Missed off information does!

Apart from these issues the App is good, but I am disappointed that after using this app now for some time I still have the same issues. Please update this app to allow them to be resolved.

Heat247 ,

I've tried many other 'gas apps' and Master Gas for me is by far the best.

I have been using Master Gas for several years now and without a doubt it is by far the easiest and most adaptable gas engineer software out there.

Occasionally a new 'app' will appear in the App Store with free trial periods and I will happily give them a try but always find them cumbersome or lacking in features.

Master Gas ticks all the boxes.
Customer Database
Forms - (Job-sheet, Gas Safety Records, Gas Breakdown/Service Record, Maintenance Checklist, Commissioning Checklist, Warning Notices....)
Accounting - (Invoicing, Payment Received, Outstanding Invoices, Estimates/Quotes, Expenses, Mileage.....)

One of my favourite features and alone is worth the subscription cost of the 'App' is Reminders, never miss a boiler service again. Servicing is our 'bread and butter' work and we need to keep on top of them for the safe and efficient operation of the customers gas appliances.

The customer services is first class to with any issues being responded to promptly. The developer is always open to new ideas for features within the app.

I can honestly say my admin work has been simplified since using Master Gas and frees up time to do other things.

Keep up the good work Little App Company 👍🏻

olliek1304 ,


I’ve been using mastergas since 2013 so think I’m one of the early users. Disregard any reviews giving less than 4 stars as disgruntled or disingenuous. These reviews are definitely not a true reflection of this app. Personally I can only commend the developer. One stop app covering all aspects from certs to invoicing to the diary.
Not sure where I’d be without this app. Really does make running a small business hell of a lot easier. Support has always been fantastic and the app is updated regularly often with additional features requested by actual engineers. Where Mastergas leads, others try to follow. Full on 5 stars from me 👍

App Privacy

The developer, Little App Company, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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