# iOBD2 vs OBD Quest

The clearest difference is rating: OBD Quest at 5.0 against iOBD2's 4.0. OBD Quest also leads on update cadence (every 3 weeks vs every 3 months). iOBD2's advantage is in-app purchases (none vs 3) and ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. OBD Quest sells 3 in-app purchases, starting at $9.99 per month. iOBD2 asks for nothing beyond the download.

OBD Quest holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: iOBD2 has 19 ratings behind it against 1, so its average is the more settled of the two.

iOBD2 ships an update every 3 months, OBD Quest every 3 weeks. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | iOBD2 | OBD Quest |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (19 ratings)](https://appshunter.io/ios/app/iobd2-dtc/id710380105/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/obd-quest/id6496854120/reviews)** |
| Number of ratings | **19** | 1 |
| Positive reviews | 28.6% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 44 MB | 54 MB |
| Requires iOS | **4.3** | 14.0.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [翔宇 金](https://appshunter.io/developer/528881861) | [Shop Booster Ltd](https://appshunter.io/developer/1741157179) |

## What reviewers say

### iOBD2

[App page](https://appshunter.io/ios/app/iobd2-dtc/id710380105)

This app serves as a reference for standard Diagnostic Trouble Codes (DTCs) found in vehicles. It helps users understand fault codes generated by a car's onboard computer, aiding in problem diagnosis.

**Highlights:** Diagnostic Trouble Code reference, Fault code lookup, Vehicle system diagnostics, Problem identification

**Features:** macOS Compatibility

**In-app purchases:** none


### OBD Quest

[App page](https://appshunter.io/ios/app/obd-quest/id6496854120)

Decode and understand car diagnostic trouble codes with this comprehensive interpreter. It provides detailed insights into fault codes, potential causes, and repair recommendations, complementing your existing OBD2 scanning tools. Access a vast database of codes across multiple languages and car brands to diagnose issues with confidence.

**Highlights:** Interpretation of over 85,000 OBD2 codes, Multilingual support (English, French, Italian, German, Portuguese, Spanish), Extensive coverage across auto makes and brands, Detailed insights for each code search, Unlimited code searches, AI-powered code interpretation

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Pro Plan | $9.99 | per month |
| Yearly Pro Plan | $99.99 | per year |
| Pro Plan for 3 days only | $0.99 | one-time |


## Frequently asked questions

### Is iOBD2 free?

iOBD2 is free to download, with no in-app purchases.

### Is OBD Quest free?

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

### Which has better reviews, iOBD2 or OBD Quest?

OBD Quest is rated higher. iOBD2 averages 4.0 out of 5 from 19 ratings, while OBD Quest averages 5.0 from 1 ratings.

### Do iOBD2 or OBD Quest have ads?

OBD Quest shows ads; iOBD2 does not.

### Which is updated more often, iOBD2 or OBD Quest?

iOBD2 ships an update every 3 months, and OBD Quest every 3 weeks. Most recently, iOBD2 was updated on November 1, 2026 and OBD Quest on November 4, 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.*