# OBD Plus vs ChkOBD OBD2 Analyzer

The clearest difference is in-app purchases: OBD Plus at none against ChkOBD OBD2 Analyzer's 4. OBD Plus also leads on rating (3.3 vs 3.0) and update cadence (every 4 weeks vs every 3 months). On price, ratings volume, 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. OBD Plus asks for nothing beyond the download.

OBD Plus holds the better App Store score, 3.3 against 3.0. Both are backed by a comparable volume of ratings — 4 and 4 respectively.

OBD Plus ships an update every 4 weeks, ChkOBD OBD2 Analyzer every 3 months. The most recent releases landed on September 21, 2026 and June 5, 2026 respectively.

## The numbers

| Metric | OBD Plus | ChkOBD OBD2 Analyzer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.3 (4 ratings)](https://appshunter.io/ios/app/obd-plus/id1208901144/reviews)** | [3.0 (4 ratings)](https://appshunter.io/ios/app/chkobd-obd2-analyzer/id1511585011/reviews) |
| Number of ratings | 4 | 4 |
| Positive reviews | 21.9% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 3 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 30 MB | 63 MB |
| Requires iOS | **8.0** | 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

### OBD Plus

[App page](https://appshunter.io/ios/app/obd-plus/id1208901144)

Monitor your vehicle's engine, emissions, and other critical systems. This app aids in diagnosing car issues and provides insights into various components for better car maintenance.

**Highlights:** Vehicle condition monitoring, Car diagnostics, Engine system monitoring, Emission control system analysis, Oxygen sensor monitoring, Fuel system analysis

**Features:** macOS Compatibility

**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 OBD Plus free?

OBD Plus 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.

### Which has better reviews, OBD Plus or ChkOBD OBD2 Analyzer?

OBD Plus is rated higher. OBD Plus averages 3.3 out of 5 from 4 ratings, while ChkOBD OBD2 Analyzer averages 3.0 from 4 ratings.

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

Neither OBD Plus nor ChkOBD OBD2 Analyzer shows ads.

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

OBD Plus ships an update every 4 weeks, and ChkOBD OBD2 Analyzer every 3 months. Most recently, OBD Plus was updated on September 21, 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.*