# Fault Code Library vs Auto Parts Catalog

The clearest difference is price: Auto Parts Catalog at Free against Fault Code Library's $1.99. Auto Parts Catalog also leads on update cadence (weekly vs every 17 months). Fault Code Library's advantage is in-app purchases (none vs 5) and iOS requirement (15.0 vs 17.0). On ads and device support there is nothing between them.

Auto Parts Catalog is free to download; Fault Code Library costs $1.99 up front. Auto Parts Catalog sells 5 in-app purchases, starting at $19.99 per year. Fault Code Library asks for nothing beyond the download.

Fault Code Library ships an update every 17 months, Auto Parts Catalog weekly. The most recent releases landed on October 8, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Fault Code Library | Auto Parts Catalog |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 17 months | **Weekly** |
| Size | 68 MB | 19 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [HITS-UK](https://appshunter.io/developer/548316663) | [Inna Chornaya](https://appshunter.io/developer/907058625) |

## What reviewers say

### Fault Code Library

[App page](https://appshunter.io/ios/app/fault-code-library/id1575364591)

**Features:** Vision Pro support

**In-app purchases:** none


### Auto Parts Catalog

[App page](https://appshunter.io/ios/app/auto-parts-catalog/id6787085263)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited - 1 Year | $19.99 | per year |
| Free Coins | Free | one-time |
| 10 Diagrams | $1.99 | one-time |
| 50 Diagrams | $6.99 | one-time |
| 100 Diagrams | $9.99 | one-time |


## Frequently asked questions

### Is Fault Code Library free?

Fault Code Library costs $1.99, with no in-app purchases.

### Is Auto Parts Catalog free?

Auto Parts Catalog is free to download, with in-app purchases available.

### Do Fault Code Library or Auto Parts Catalog have ads?

Neither Fault Code Library nor Auto Parts Catalog shows ads.

### Which is updated more often, Fault Code Library or Auto Parts Catalog?

Fault Code Library ships an update every 17 months, and Auto Parts Catalog weekly. Most recently, Fault Code Library was updated on October 8, 2026 and Auto Parts Catalog on October 12, 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.*