# Dr.OBD vs ChkOBD OBD2 Analyzer

The clearest difference is in-app purchases: Dr.OBD at none against ChkOBD OBD2 Analyzer's 4. Dr.OBD also leads on iOS requirement (11.0 vs 13.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. ChkOBD OBD2 Analyzer sells 4 in-app purchases, starting at $4.99 per month. Dr.OBD asks for nothing beyond the download.

Dr.OBD ships an update every 2 months, ChkOBD OBD2 Analyzer every 3 months. The most recent releases landed on September 22, 2026 and June 5, 2026 respectively.

## The numbers

| Metric | Dr.OBD | ChkOBD OBD2 Analyzer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (4 ratings)](https://appshunter.io/ios/app/chkobd-obd2-analyzer/id1511585011/reviews)** |
| Number of ratings | — | **4** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | — | Free with in-app purchases |
| Size | 3 MB | 63 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Leagend Optoelectronics Co., Ltd.](https://appshunter.io/developer/6798210621) | [Check On-Board Diagnostics LLC](https://appshunter.io/developer/1511585010) |

## What reviewers say

### Dr.OBD

[App page](https://appshunter.io/ios/app/drobd/id1225894625)

**In-app purchases:** none


### ChkOBD OBD2 Analyzer

[App page](https://appshunter.io/ios/app/chkobd-obd2-analyzer/id1511585011)

Connect your iPhone or iPad to your car's engine to view vital data. Access basic engine values for free, with in-app purchases for advanced diagnostics, smog check readiness, VIN analysis, and error decoding.

**Highlights:** View engine values, In-app purchase for advanced data, Smog Check Assistant, VIN Analyzer, Error Decoder and Reset, Bluetooth adapter compatibility check

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Smog Check Assistant | $4.99 | per month |
| VIN Analyzer | $1.99 | one-time |
| Error Analyzer | $2.99 | one-time |
| Advance Engine Values | $4.99 | one-time |


## Frequently asked questions

### Is Dr.OBD free?

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

### Is ChkOBD OBD2 Analyzer free?

ChkOBD OBD2 Analyzer is free to download, with in-app purchases available.

### Do Dr.OBD or ChkOBD OBD2 Analyzer have ads?

Neither Dr.OBD nor ChkOBD OBD2 Analyzer shows ads.

### Which is updated more often, Dr.OBD or ChkOBD OBD2 Analyzer?

Dr.OBD ships an update every 2 months, and ChkOBD OBD2 Analyzer every 3 months. Most recently, Dr.OBD was updated on September 22, 2026 and ChkOBD OBD2 Analyzer on June 5, 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.*