# ViperGas > Technical manuals and training resources for gas engineers. (iPhone/iPad app by Viper Services Group Limited.) - Source: https://appshunter.io/ios/app/vipergas/id6463507065 (this page in markdown: same URL + `.md`) - Developer: [Viper Services Group Limited](https://appshunter.io/developer/1704544063) - Category: Education, Books - Price: Free - Age rating: 4+ - Requires: iOS 11.0 · 163 MB - Released: 2023-08-30 - Data updated: 2026-06-01 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/vipergas/id6463507065/reviews.md ## What is ViperGas? A complete collection of all the latest domestic, commercial and LPG chapters within the ViperGas Technical Manuals library. Based on the latest technical specifications from key industry organisations, the ViperGas App is designed to support ACS training and when coupled with the ViperGas range of self-study workbooks, a route to assessment. The Domestic Natural Gas Handbook is used successfully by installers, inspectors, national training organisations, councils, assessors and trainers and currently used by over 120 training centres throughout the UK and Ireland. The core objective within ViperGas is to provide accurate technical information to registered gas engineers and individuals undergoing qualification. The ViperGas Stay Safe program is available to all individuals or businesses with an active subscription, providing automatic updates to your printed and digital publications once activated within our portal. ## Key features - Technical Manuals Library - Domestic, Commercial, LPG Chapters - ACS Training Support - Self-Study Workbook Integration - Accurate Technical Information - Stay Safe Program ## Recent user reviews (10 of 20) All indexed reviews: https://appshunter.io/ios/app/vipergas/id6463507065/reviews.md ### 1/5 — App keeps crashing *2026-01-12, version v1.83* No help page, app keeps crashing. No idea how to get a refund. Disappointed for the lack of any support. ### 1/5 — Crashes in iOS *2025-08-10, version v1.83* Still no fix, great when it works ### 2/5 — Not working on iOS *2025-07-14, version v1.83* This app doesn’t work on iOS. It hasn’t for a few months (end of April). When it was working it was fantastic! I’ve emailed support and not received any feedback but dealt with Aaron and has been a great help but still no answers as to when the app will be back up and running on iOS ### 5/5 — Best information and app around *2025-06-01, version v1.83* This app is by far the best i’ve seen and the information and service that viper has provide are second to none . I always recommend them to all my gas engineering friends , Arron who i deal with is particularly great at customer service and has helped me out on numerous occasions . top notch company ! ### 1/5 — Poor *2025-04-12, version v1.83* Purchased the subscription and downloaded the app. Tried logging in but it just crashes. Have tried contacting the company but no response. I'd avoid the wasted time an energy and just buy the books. ### 1/5 — Doesn’t load *2025-03-22, version v1.83* The app hasn’t worked for months. It crashes on start up using multiple different iOS devices. Wasted months off my subscription waiting for an update! ### 1/5 — App crashes immediately after launching *2025-01-22, version v1.83* IOS 18.2.1 ### 5/5 — This is a must have on your phone for any gas engineer *2024-10-19, version v1.83* Couldn’t be without the viper gas app it’s is handy to have all the latest legislation at your fingertips in your pocket 👊🏼 ### 5/5 — Game changer *2024-08-13, version v1.80* This app has everything and can be used offline. There’s no more need to the flicking through multiple books to find the answer with a quick search you can get what information you need in 5 minutes. We all know time = money. ### 5/5 — Impressive *2024-07-22* ViperGas is a really useful app to have out in the field when carrying out gas works! It makes life so much easier being able to have all the regs and documents we need, accessible at all times on your phone or other devices - all kept up to date as regs change etc! The search function is really useful as often we know what we’re looking for but don’t always know the correct things to search or categories to use so being able to just type a keyword or phrase is brilliant! Highly recommend! ## Frequently asked questions about ViperGas ### What kind of technical information does ViperGas provide? ViperGas offers a complete collection of the latest domestic, commercial, and LPG chapters within its Technical Manuals library. This information is based on the latest technical specifications from key industry organizations, ensuring accuracy for gas engineers. ### Is ViperGas suitable for ACS training? Yes, the ViperGas App is specifically designed to support ACS training. When coupled with ViperGas self-study workbooks, it provides a clear route towards assessment and qualification. ### Who uses the ViperGas Domestic Natural Gas Handbook? The Domestic Natural Gas Handbook is successfully used by installers, inspectors, national training organizations, councils, assessors, and trainers. It is currently utilized by over 120 training centers throughout the UK and Ireland. ### How does the ViperGas Stay Safe program work? The ViperGas Stay Safe program provides automatic updates to your printed and digital publications once activated within their portal. This program is available to all individuals or businesses with an active subscription. ### What devices is ViperGas available on? ViperGas is available on iPhone, iPad, and iPod devices. It is designed to be accessible on Apple's mobile and tablet platforms. ### How often is ViperGas updated? The latest version of ViperGas is v1.83, and it was last updated on October 2, 2024. This indicates a commitment to providing current information and features. ### What is the age rating for ViperGas? ViperGas has an age rating of 4+. This suggests it is suitable for a wide range of users, though its primary audience is professionals. ### Does ViperGas offer certifications? While ViperGas supports ACS training and provides a route to assessment, the app itself does not directly issue certifications. It serves as a resource to aid in the qualification process. ## Version history (last 5 releases) ### v1.83 — 2024-10-02 Support for iOS 18 Devices. ### v1.80 — 2023-09-19 iOS 17 and iPhone 15 support. ### v1.71 — 2023-09-04 Launch of the brand new X-LPG section covering Leisure Accommodation Vehicles and Park Homes. ### 1.62 — 2023-08-31 Minor bug fixes viewing chapters on certain devices. ### 1.5 — 2023-08-30 No release notes. ## Apps similar to ViperGas | App | Rating | Price | Category | | --- | --- | --- | --- | | [ACS Gas Appliances Exam CCN1](https://appshunter.io/ios/app/acs-gas-appliances-exam-ccn1/id6742821397) | — | $9.99 | Education | | [Smart Assessor](https://appshunter.io/ios/app/smart-assessor/id562195025) | — | Free | Education | | [ACS Gas Safety Exam CCN1](https://appshunter.io/ios/app/acs-gas-safety-exam-ccn1/id6447238915) | — | $19.99 | Education | --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*