# Fernox vs Sentinel InstaCheck +

The clearest difference is update cadence: Fernox at every 3 weeks against Sentinel InstaCheck +'s every 4 months. 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.

Fernox ships an update every 3 weeks, Sentinel InstaCheck + every 4 months. The most recent releases landed on October 27, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Fernox | Sentinel InstaCheck + |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/fernox/id6615081080/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 4 months |
| Monetization | Free | — |
| Size | 58 MB | 3 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Fernox Ltd](https://appshunter.io/developer/506290125) | [Energy & Compliance Technology Ltd](https://appshunter.io/developer/1533793622) |

## What reviewers say

### Fernox

[App page](https://appshunter.io/ios/app/fernox/id6615081080)

This platform offers comprehensive water testing capabilities with an enhanced user experience. It allows users to invite managers to view submissions, features improved security with biometric login options, and includes a global address finder for efficient property detail input.

**Highlights:** Water testing capabilities, Manager viewing of submissions, Biometric/Passcode login, Global address finder, Automatic property re-testing recognition, Streamlined registration

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

**In-app purchases:** none


### Sentinel InstaCheck +

[App page](https://appshunter.io/ios/app/sentinel-instacheck-plus/id6745335462)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Fernox free?

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

### Is Sentinel InstaCheck + free?

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

### Do Fernox or Sentinel InstaCheck + have ads?

Neither Fernox nor Sentinel InstaCheck + shows ads.

### Which is updated more often, Fernox or Sentinel InstaCheck +?

Fernox ships an update every 3 weeks, and Sentinel InstaCheck + every 4 months. Most recently, Fernox was updated on October 27, 2026 and Sentinel InstaCheck + on October 14, 2026.

---

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