# ChkOBD OBD2 Analyzer vs Troodon OBD

The clearest difference is in-app purchases: Troodon OBD at none against ChkOBD OBD2 Analyzer's 4. Troodon OBD also leads on update cadence (every 3 weeks vs every 3 months). ChkOBD OBD2 Analyzer's advantage is iOS requirement (13.0 vs 15.0). On price, 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. Troodon OBD asks for nothing beyond the download.

ChkOBD OBD2 Analyzer ships an update every 3 months, Troodon OBD every 3 weeks. The most recent releases landed on October 13, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | ChkOBD OBD2 Analyzer | Troodon OBD |
| --- | --- | --- |
| 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 | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 63 MB | 27 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Check On-Board Diagnostics LLC](https://appshunter.io/developer/1511585010) | [DevCom spol. s r.o.](https://appshunter.io/developer/1725153456) |

## What reviewers say

### 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 |


### Troodon OBD

[App page](https://appshunter.io/ios/app/troodon-obd/id6475777811)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ChkOBD OBD2 Analyzer free?

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

### Is Troodon OBD free?

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

### Do ChkOBD OBD2 Analyzer or Troodon OBD have ads?

Neither ChkOBD OBD2 Analyzer nor Troodon OBD shows ads.

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

ChkOBD OBD2 Analyzer ships an update every 3 months, and Troodon OBD every 3 weeks. Most recently, ChkOBD OBD2 Analyzer was updated on October 13, 2026 and Troodon OBD on October 17, 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.*