# Sentinel InstaCheck + vs BoilerFix AI

The clearest difference is in-app purchases: Sentinel InstaCheck + at none against BoilerFix AI's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. BoilerFix AI sells 2 in-app purchases, starting at $3.99 per month. Sentinel InstaCheck + asks for nothing beyond the download.

Sentinel InstaCheck + ships an update every 4 months, BoilerFix AI every 3 months. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Sentinel InstaCheck + | BoilerFix AI |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | — | Subscription |
| Size | 3 MB | 7 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Energy & Compliance Technology Ltd](https://appshunter.io/developer/1533793622) | [Stephen Bird](https://appshunter.io/developer/1896013981) |

## What reviewers say

### Sentinel InstaCheck +

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

**Features:** macOS Compatibility

**In-app purchases:** none


### BoilerFix AI

[App page](https://appshunter.io/ios/app/boilerfix-ai/id6765623181)

A comprehensive mobile toolkit designed for UK Gas Safe registered heating engineers. It consolidates fault code databases, control guides, AI diagnostics, customer management, and administrative tools into a single, offline-capable application.

**Highlights:** Fault Code Database (12 manufacturers), AI Diagnostic Assistant, Boiler Passport (QR-linked service history), Customer Hub & Job Calendar, CP12 Certificates generation, Invoicing & Bookkeeping, Offline functionality

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BoilerFix AI Basic | $3.99 | per month |
| BoilerFix AI Pro | $5.99 | per month |


## Frequently asked questions

### Is Sentinel InstaCheck + free?

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

### Is BoilerFix AI free?

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

### Do Sentinel InstaCheck + or BoilerFix AI have ads?

Neither Sentinel InstaCheck + nor BoilerFix AI shows ads.

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

Sentinel InstaCheck + ships an update every 4 months, and BoilerFix AI every 3 months. Most recently, Sentinel InstaCheck + was updated on October 28, 2026 and BoilerFix AI on October 31, 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.*