# BT1 vs OBD2 Scanner | OBD Auto Doctor

The clearest difference is rating: OBD2 Scanner | OBD Auto Doctor at 4.4 against BT1's 2.4. OBD2 Scanner | OBD Auto Doctor also leads on ratings volume (6.2K vs 14) and update cadence (every 3 weeks vs every 4 months). BT1's advantage is in-app purchases (none vs 9) and review sentiment (48% vs 30%). On price, 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. BT1 asks for nothing beyond the download.

OBD2 Scanner | OBD Auto Doctor holds the better App Store score, 4.4 against 2.4. That said, the two scores are not equally well evidenced: OBD2 Scanner | OBD Auto Doctor has 6.2K ratings behind it against 14, so its average is the more settled of the two. Written reviews complicate that: 48% of BT1's written reviews are positive against 30% of OBD2 Scanner | OBD Auto Doctor's, so the app with the better star average is not the one people write more warmly about.

BT1 ships an update every 4 months, OBD2 Scanner | OBD Auto Doctor every 3 weeks. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | BT1 | OBD2 Scanner | OBD Auto Doctor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.4 (14 ratings)](https://appshunter.io/ios/app/bt1/id471892883/reviews) | **[4.4 (6.2K ratings)](https://appshunter.io/ios/app/obd2-scanner-obd-auto-doctor/id908897183/reviews)** |
| Number of ratings | 14 | **6.2K** |
| Positive reviews | **47.7% of reviews** | 30.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | **Free** | Freemium |
| Size | 5 MB | 19 MB |
| Requires iOS | **10.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [GoPoint Technology, Inc](https://appshunter.io/developer/351684882) | [Creosys](https://appshunter.io/developer/908897186) |

## What reviewers say

### BT1

[App page](https://appshunter.io/ios/app/bt1/id471892883)

Decode your vehicle's Check Engine Light and check for recalls or service bulletins. Connect a compatible scanner to your device to gain insights into your car's health and avoid unexpected issues.

**Highlights:** Decode Check Engine Light, Check for vehicle recalls, Check for Special Service Bulletins, Connects via Bluetooth or cable scanner, Pairs with iPhone, iPod touch, or iPad

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 👍 Works as advertised (sometimes)
- 👍 Good hardware
- 👍 Cool technology
- 👍 Great for basic diagnostics

**What reviewers complain about**

- 🐛 Crashes frequently
- 🐛 Incompatible with newer iOS versions
- 🐛 Does not detect fault codes accurately
- 🐛 Limited functionality
- 🐛 Outdated software

**Reported bugs**

- App crashes when scanning vehicle
- App crashes after 30 seconds
- App not working anymore
- Cannot select make/model
- App not updated for newer vehicles

**Requested features**

- Update app for newer iOS versions
- Add more vehicle makes/models
- Improve fault code detection
- Add live data stream
- Firmware update for Bluetooth device


### 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


## Frequently asked questions

### Is BT1 free?

BT1 is free to download, with no in-app purchases.

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

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

### Which has better reviews, BT1 or OBD2 Scanner | OBD Auto Doctor?

OBD2 Scanner | OBD Auto Doctor is rated higher. BT1 averages 2.4 out of 5 from 14 ratings, while OBD2 Scanner | OBD Auto Doctor averages 4.4 from 6.2K ratings.

### Do BT1 or OBD2 Scanner | OBD Auto Doctor have ads?

Neither BT1 nor OBD2 Scanner | OBD Auto Doctor shows ads.

### Which is updated more often, BT1 or OBD2 Scanner | OBD Auto Doctor?

BT1 ships an update every 4 months, and OBD2 Scanner | OBD Auto Doctor every 3 weeks. Most recently, BT1 was updated on November 1, 2026 and OBD2 Scanner | OBD Auto Doctor on November 6, 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.*