# 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 (15.0 vs 18.5). QuickGasCerts's advantage is update cadence (every 3 weeks vs every 4 months). On price, 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 4 months, QuickGasCerts every 3 weeks. The most recent releases landed on September 10, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | Sentinel InstaCheck + | QuickGasCerts |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 3 MB | 18 MB |
| Requires iOS | **15.0** | 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-plus/id6745335462)

**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 4 months, and QuickGasCerts every 3 weeks. Most recently, Sentinel InstaCheck + was updated on September 10, 2026 and QuickGasCerts on September 6, 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.*