# OBD Quest vs Plier

The clearest difference is ads: Plier at none against OBD Quest's shown. Plier also leads on update cadence (weekly vs every 3 weeks) and ratings volume (15 vs 1). OBD Quest's advantage is rating (5.0 vs 4.6). On price, in-app purchases, monetization model 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 and Plier sells 2 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

OBD Quest holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Plier has 15 ratings behind it against 1, so its average is the more settled of the two.

OBD Quest ships an update every 3 weeks, Plier weekly. The most recent releases landed on October 19, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | OBD Quest | Plier |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/obd-quest/id6496854120/reviews)** | [4.6 (15 ratings)](https://appshunter.io/ios/app/plier-car-maintenance-tracker/id6742336175/reviews) |
| Number of ratings | 1 | **15** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 54 MB | 54 MB |
| Requires iOS | **14.0.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shop Booster Ltd](https://appshunter.io/developer/1741157179) | [Heap Labs LLC](https://appshunter.io/developer/840318089) |

## What reviewers say

### 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 |


### Plier

[App page](https://appshunter.io/ios/app/plier-car-maintenance-tracker/id6742336175)

Transform your iPhone into an AI-powered car diagnostic tool. Connect to your vehicle via an OBD2 device to understand its health, diagnose issues, and estimate repair costs.

**Highlights:** AI-driven diagnostic reports, Real-time OBD2 data and graphs, Check engine light insights, Repair cost estimation, ELM327 Bluetooth compatibility, Troubleshoot engine codes

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro (Weekly) | $6.99 | per 7 days |
| Pro ( 1 Year ) | $49.99 | per year |


## Frequently asked questions

### Is OBD Quest free?

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

### Is Plier free?

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

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

OBD Quest is rated higher. OBD Quest averages 5.0 out of 5 from 1 ratings, while Plier averages 4.6 from 15 ratings.

### Do OBD Quest or Plier have ads?

OBD Quest shows ads; Plier does not.

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

OBD Quest ships an update every 3 weeks, and Plier weekly. Most recently, OBD Quest was updated on October 19, 2026 and Plier on October 24, 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.*