# Gas Checker vs Gastite Sizing App

The clearest difference is review sentiment: Gastite Sizing App at 100% against Gas Checker's 61%. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Gas Checker | Gastite Sizing App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/gas-checker/id523576969/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 61.1% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free | Free |
| Size | 234 MB | 15 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [GasSoft limited](https://appshunter.io/developer/523576972) | [Gastite Systems Limited](https://appshunter.io/developer/1537998855) |

## What reviewers say

### Gas Checker

[App page](https://appshunter.io/ios/app/gas-checker/id523576969)

Streamline your gas and heating business with digital reporting and invoicing. Automate customer reminders, create PDF reports, and integrate with accounting software. Eliminate paper forms and manage all your job documentation efficiently.

**Highlights:** Create PDF reports (certificates, invoices, quotes), Automated customer reminders, Digital job sheets, Quickbooks/Xero integration, Cloud data sync, Eliminate paper forms

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 👍 Makes life easier
- 👍 Great for gas engineers
- 👍 Saves time and paper
- 👍 Good value

**What reviewers complain about**

- 🐛 Software difficulties
- 🐛 Bugs here and there
- 🐛 Latest bug: cannot open on iPad
- 🐛 Contradictory tech advice
- 🐛 App crashes instead of opening

**Reported bugs**

- Forgotten login details lock out users
- Cannot open App on iPad with iOS 10.3
- App crashes instead of opening
- App crashes again after connecting to internet
- Cannot get past 'add a profile picture' screen

**Requested features**

- New commercial forms
- Stock control bolt-on
- Improve breakdown repair paperwork length


### Gastite Sizing App

[App page](https://appshunter.io/ios/app/gastite-sizing-app/id1537998852)

This app simplifies calculating the required size of Gastite® CSST for gas installations. Input gas type, CSST length, and appliance power to instantly determine the correct size. It offers easy navigation, user-friendly design, and access to FAQs and installation guides.

**Highlights:** CSST sizing calculation, Natural gas or LPG selection, Access to FAQs, Downloadable installation guide, User-friendly design, Contact support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Gas Checker free?

Gas Checker is free to download, with no in-app purchases.

### Is Gastite Sizing App free?

Gastite Sizing App is free to download, with no in-app purchases.

### Do Gas Checker or Gastite Sizing App have ads?

Neither Gas Checker nor Gastite Sizing App shows ads.

### Which is updated more often, Gas Checker or Gastite Sizing App?

Gas Checker ships an update every 3 weeks, and Gastite Sizing App every 3 weeks. Most recently, Gas Checker was updated on November 1, 2026 and Gastite Sizing App on November 3, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*