# OBD2 Scanner | OBD Auto Doctor vs OBD Compass

The clearest difference is in-app purchases: OBD Compass at none against OBD2 Scanner | OBD Auto Doctor's 9. OBD Compass also leads on iOS requirement (13.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. OBD2 Scanner | OBD Auto Doctor sells 9 in-app purchases, starting at $4.99 per month. OBD Compass asks for nothing beyond the download.

OBD2 Scanner | OBD Auto Doctor ships an update every 3 weeks, OBD Compass monthly. The most recent releases landed on November 9, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | OBD2 Scanner | OBD Auto Doctor | OBD Compass |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (6.2K ratings)](https://appshunter.io/ios/app/obd2-scanner-obd-auto-doctor/id908897183/reviews)** | — |
| Number of ratings | **6.2K** | — |
| Positive reviews | 30.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Freemium | — |
| Size | 19 MB | 25 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Creosys](https://appshunter.io/developer/908897186) | [HK TOPDON TECHNOLOGY Co., LIMITED](https://appshunter.io/developer/1846276192) |

## What reviewers say

### OBD2 Scanner | OBD Auto Doctor

[App page](https://appshunter.io/ios/app/obd2-scanner-obd-auto-doctor/id908897183)

Transform your iPhone into a car diagnostic tool. Read and clear engine trouble codes, monitor live engine data, and check emissions readiness with a compatible OBD2 dongle.

**Highlights:** Read and clear diagnostic trouble codes (DTCs), Monitor live engine data, Check emissions readiness, View freeze-frame data, Create custom sensor dashboards, Works with compatible OBD2 dongles

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly (legacy) | $4.99 | per month |
| Personal, monthly | $4.99 | per month |
| Premium, monthly | $5.99 | per month |
| Professional, monthly | $6.99 | per month |
| Yearly (legacy) | $23.99 | per year |
| Personal, yearly | $23.99 | per year |
| Professional, yearly | $29.99 | per year |
| Premium, annual | $29.99 | per year |
| OBD Auto Doctor Pro (legacy) | $29.99 | one-time |

**What reviewers like**

- 🚀 Works great
- 👍 Easy to use
- 🚀 Accurate diagnostics
- 🚀 Extensive adapter support
- 👍 Helpful for DIY mechanics

**What reviewers complain about**

- 🔒 Requires subscription for full functionality
- 🐛 Connection issues
- 🐛 Inconsistent performance
- 🐛 Doesn't work with all vehicles
- 💰 Expensive subscription

**Reported bugs**

- App crashes on launch
- Fails to detect existing fault codes
- Subscription issues and inability to cancel
- Incompatible with certain OBD2 adapters

**Requested features**

- Add support for more vehicle makes and models
- Improve Bluetooth/WiFi connectivity
- Provide more detailed diagnostic information
- Allow clearing of error codes without subscription
- Add live data dashboards and graphs


### OBD Compass

[App page](https://appshunter.io/ios/app/obd-compass/id6758076036)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is OBD2 Scanner | OBD Auto Doctor free?

OBD2 Scanner | OBD Auto Doctor is free to download, with in-app purchases available.

### Is OBD Compass free?

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

### Do OBD2 Scanner | OBD Auto Doctor or OBD Compass have ads?

Neither OBD2 Scanner | OBD Auto Doctor nor OBD Compass shows ads.

### Which is updated more often, OBD2 Scanner | OBD Auto Doctor or OBD Compass?

OBD2 Scanner | OBD Auto Doctor ships an update every 3 weeks, and OBD Compass monthly. Most recently, OBD2 Scanner | OBD Auto Doctor was updated on November 9, 2026 and OBD Compass on October 31, 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.*