# BoilerFix AI vs Flint

The clearest difference is monetization model: Flint at free with in-app purchases against BoilerFix AI's subscription. Flint also leads on update cadence (every 4 days vs every 3 months). BoilerFix AI's advantage is ads (none vs shown). On price, review sentiment, in-app purchases 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 and Flint sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

BoilerFix AI ships an update every 3 months, Flint every 4 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | BoilerFix AI | Flint |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 4 days** |
| Monetization | Subscription | **Free with in-app purchases** |
| Size | 7 MB | 81 MB |
| Requires iOS | **15.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Stephen Bird](https://appshunter.io/developer/1896013981) | [Onspec Software Ltd](https://appshunter.io/developer/6792139382) |

## What reviewers say

### 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 |


### Flint

[App page](https://appshunter.io/ios/app/flint-boiler-onsite-guide/id6792139380)

This app provides UK gas engineers with instant access to boiler manuals, fault codes, service figures, and fault-finding charts for thousands of domestic gas boilers. It features a search function, a Q&A tool powered by manual data, and essential calculation tools for onsite use.

**Highlights:** 2,300+ gas boilers from 45 manufacturers, 60,000+ fault codes with manual references, 1,000+ manufacturer manuals with full-text search, Service figures for over 2,100 models, Interactive fault-finding charts, AI-powered Q&A for manual queries, Onsite calculation tools (gas rate, CO/CO2, etc.)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Flint Pro | $3.99 | per month |
| Flint Pro | $29.99 | per year |


## Frequently asked questions

### Is BoilerFix AI free?

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

### Is Flint free?

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

### Do BoilerFix AI or Flint have ads?

Flint shows ads; BoilerFix AI does not.

### Which is updated more often, BoilerFix AI or Flint?

BoilerFix AI ships an update every 3 months, and Flint every 4 days. Most recently, BoilerFix AI was updated on October 31, 2026 and Flint 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.*