# Sentinel InstaCheck vs iDocuments Mobile

The clearest difference is update cadence: iDocuments Mobile at every 2 months against Sentinel InstaCheck's every 5 months. Sentinel InstaCheck's advantage is iOS requirement (11.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Sentinel InstaCheck ships an update every 5 months, iDocuments Mobile every 2 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Sentinel InstaCheck | iDocuments Mobile |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 17 MB | 26 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Energy & Compliance Technology Ltd](https://appshunter.io/developer/1533793622) | [Vision33, Inc.](https://appshunter.io/developer/1498667234) |

## 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


### iDocuments Mobile

[App page](https://appshunter.io/ios/app/idocuments-mobile/id1636832029)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sentinel InstaCheck free?

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

### Is iDocuments Mobile free?

iDocuments Mobile is free to download, with no in-app purchases.

### Do Sentinel InstaCheck or iDocuments Mobile have ads?

Neither Sentinel InstaCheck nor iDocuments Mobile shows ads.

### Which is updated more often, Sentinel InstaCheck or iDocuments Mobile?

Sentinel InstaCheck ships an update every 5 months, and iDocuments Mobile every 2 months. Most recently, Sentinel InstaCheck was updated on November 3, 2026 and iDocuments Mobile 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.*