# Sentinel InstaCheck vs QuickGasCerts

The clearest difference is in-app purchases: Sentinel InstaCheck at none against QuickGasCerts's 3. Sentinel InstaCheck also leads on iOS requirement (11.0 vs 18.5). QuickGasCerts's advantage is update cadence (every 3 weeks vs every 5 months). On price, review sentiment, ads and device support there is nothing between them.

Both are free to download. QuickGasCerts sells 3 in-app purchases, starting at $19.99 per year. Sentinel InstaCheck asks for nothing beyond the download.

Sentinel InstaCheck ships an update every 5 months, QuickGasCerts every 3 weeks. The most recent releases landed on October 10, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Sentinel InstaCheck | QuickGasCerts |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 17 MB | 18 MB |
| Requires iOS | **11.0** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Energy & Compliance Technology Ltd](https://appshunter.io/developer/1533793622) | [Peter Smith](https://appshunter.io/developer/1824255657) |

## What reviewers say

### Sentinel InstaCheck

[App page](https://appshunter.io/ios/app/sentinel-instacheck/id1632231527)

This application assists users in performing water quality tests for heating systems, following UK best practices. It provides tailored recommendations for system care based on test results, helping to prevent breakdowns and maintain heating efficiency.

**Highlights:** Guides water quality testing, Follows BS7593 standard, Generates water quality reports, Provides tailored care recommendations, Protects boiler and heat pump installations, Helps prevent breakdowns and inefficiency

**Features:** macOS Compatibility

**In-app purchases:** none


### QuickGasCerts

[App page](https://appshunter.io/ios/app/quickgascerts/id6748575124)

This app streamlines the creation and management of Gas Safety Certificates for gas engineers. It offers a user-friendly interface to simplify administrative tasks.

**Highlights:** Create Gas Safety Certificates, Manage Certificates, Easy-to-use interface, Mobile convenience

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Quick Gas Certs | $19.99 | per year |
| asdasd | $39.99 | per month |
| Yearly subscription | $19.99 | one-time |


## Frequently asked questions

### Is Sentinel InstaCheck free?

Sentinel InstaCheck is free to download, with no in-app purchases.

### Is QuickGasCerts free?

QuickGasCerts is free to download, with in-app purchases available.

### Do Sentinel InstaCheck or QuickGasCerts have ads?

Neither Sentinel InstaCheck nor QuickGasCerts shows ads.

### Which is updated more often, Sentinel InstaCheck or QuickGasCerts?

Sentinel InstaCheck ships an update every 5 months, and QuickGasCerts every 3 weeks. Most recently, Sentinel InstaCheck was updated on October 10, 2026 and QuickGasCerts on October 7, 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.*