BT1 vs OBD2 Scanner | OBD Auto Doctor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BT1
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.
- 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
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Calm Your Auto Woes! One in ten vehicles in the US have the Check Engine Light on. Is yours one of them? Was your vehicle one of the 20 million recalled in 2010? Simply connect our BT1 (Bluetooth) or GL1 (cabled) automotive scanner (sold separately) to your vehicle; pair with your iPhone or iPod touch, or iPad; and remove the risks, and surprises, from driving. - Decode the Check Engine Light - Check for vehicle recalls - Check for Special Service Bulletins Like having your own personal mechanic riding next to you!
OBD2 Scanner | OBD Auto Doctor
Diagnose your car's engine light issues and monitor real-time performance data. This app allows you to read and clear diagnostic trouble codes, track fuel consumption, and view sensor data. It's a comprehensive tool for understanding your vehicle's health.
- Read and clear OBD2 diagnostic trouble codes (DTC)
- Reset Check Engine Light
- Monitor real-time vehicle data and sensor readings
- Track fuel consumption
- Read readiness monitor status for emissions testing
- Initiate service routines
- Send diagnostic data via email
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Turn your iPhone into a powerful OBD2 car scanner and diagnose your vehicle yourself. Check why your Check Engine Light is on, read and clear diagnostic trouble codes, monitor live engine data, and check emissions readiness — all from your iPhone or iPad with a compatible OBD2 dongle. CHECK YOUR CHECK ENGINE LIGHT Don't guess what's wrong with your car. OBD Auto Doctor reads diagnostic trouble codes from your vehicle and provides detailed information to help you understand what they mean. • Read diagnostic trouble codes (DTCs) • Clear Check Engine Light codes • View detailed code descriptions • Read freeze-frame data MONITOR YOUR CAR IN REAL TIME See what's happening while your engine is running with live OBD2 data. • Engine RPM and vehicle speed • Coolant temperature • Fuel system and fuel trim data • Throttle position • Intake air and engine load • Oxygen sensor data • And many other vehicle parameters Create your own dashboard and choose exactly which sensors you want to monitor. CHECK EMISSIONS READINESS Preparing for an emissions or vehicle inspection? Check your vehicle's readiness monitors and see whether your car's emissions systems have completed their tests. WORKS WITH OBD2 DONGLES Connect OBD Auto Doctor to your vehicle using a compatible Bluetooth, Wi-Fi or Bluetooth Low Energy (BLE) OBD2 dongle. Compatible dongles include many ELM327-based adapters, OBDLink, Vgate, Linker, Veepeak and other compatible OBD2 interfaces. Please note: An OBD2 dongle is required to connect the app to your vehicle. Dongle compatibility and available features depend on your vehicle. MORE THAN JUST A CODE READER OBD Auto Doctor gives you access to the information your car's onboard diagnostic system makes available. • Read vehicle information • Monitor fuel consumption • View and record live sensor data • Read diagnostic trouble codes • Clear diagnostic trouble codes • Check emissions readiness • View freeze-frame data • Monitor vehicle performance Whether you're trying to understand a Check Engine Light, preparing your car for inspection, monitoring your engine, or simply want to know more about your vehicle, OBD Auto Doctor puts professional-style OBD2 diagnostics in your pocket. Download OBD Auto Doctor and start diagnosing your car today. SUBSCRIPTION OBD Auto Doctor offers optional subscriptions that unlock additional features. Terms of Use: https://www.obdautodoctor.com/terms
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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. Both last shipped on November 1, 2026.
| Parameter | BT1 | OBD2 Scanner | OBD Auto Doctor |
|---|---|---|
| Price | Free | Free |
| Rating | 2.4 (14 ratings) | 4.4 (6.2K ratings) — better |
| Positive reviews | 47.7% of reviews — better | 30.3% of reviews |
| Number of ratings | 14 | 6.2K — better |
| Update frequency | Every 4 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 10.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 5 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | GoPoint Technology, Inc | Creosys |
Customer experience
BT1
OBD2 Scanner | OBD Auto Doctor
User reviews
BT1
From 14 App Store ratingsWhat we love
- 👍 Easy to use
- 👍 Works as advertised (sometimes)
- 👍 Good hardware
- 👍 Cool technology
- 👍 Great for basic diagnostics
Room to improve
- 🐛 Crashes frequently
- 🐛 Incompatible with newer iOS versions
- 🐛 Does not detect fault codes accurately
- 🐛 Limited functionality
- 🐛 Outdated software
OBD2 Scanner | OBD Auto Doctor
From 6.2K App Store ratingsWhat we love
- 🚀 Works great
- 👍 Easy to use
- 🚀 Accurate diagnostics
- 🚀 Extensive adapter support
- 👍 Helpful for DIY mechanics
Room to improve
- 🔒 Requires subscription for full functionality
- 🐛 Connection issues
- 🐛 Inconsistent performance
- 🐛 Doesn't work with all vehicles
- 💰 Expensive subscription
Bugs and requests
BT1
Reported bugs
25 issues- App crashes when scanning vehicle
- App crashes after 30 seconds
- App not working anymore
- Cannot select make/model
- App not updated for newer vehicles
Show 20 moreShow fewer
- App not compatible with newer IOS versions
- Initialization failed error
- Cannot install app on older devices due to iOS requirements
- Bluetooth device has trouble connecting
- App crashes upon setup
- Blank boxes for make/model selection
- App freezes and glitches
- App locks up when entering car data
- App crashes every time
- Cannot get past create account screen
- App crashes only once (user reported)
- Difficult or time-consuming to connect
- Http error when connected
- App crashes when connected
- Doesn't clear check engine light
- No data stream info
- App asks for vehicle info and searches recalls
- Less functions than cabled version
- Software too basic
- Does not clear codes or reset trouble lights
Requested features
8 requests- Update app for newer iOS versions
- Add more vehicle makes/models
- Improve fault code detection
- Add live data stream
- Firmware update for Bluetooth device
Show 3 moreShow fewer
- More detailed vehicle stats
- Constant data recording
- More advanced features
OBD2 Scanner | OBD Auto Doctor
Reported bugs
4 issues- App crashes on launch
- Fails to detect existing fault codes
- Subscription issues and inability to cancel
- Incompatible with certain OBD2 adapters
Requested features
6 requests- 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
Show 1 moreShow fewer
- Integrate with vehicle maintenance scheduling
In-app purchases
BT1
No in-app purchases
OBD2 Scanner | OBD Auto Doctor
- Monthly (legacy)$4.991 Month
- Personal, monthly$4.991 Month
- Premium, monthly$5.991 Month
Show 5 moreShow fewer
- Professional, monthly$6.991 Month
- Yearly (legacy)$23.991 Year
- Personal, yearly$23.991 Year
- Professional, yearly$29.991 Year
- Premium, annual3 Days trial$29.991 Year
- OBD Auto Doctor Pro (legacy)$29.99
Questions
Is BT1 free?
Is OBD2 Scanner | OBD Auto Doctor free?
Which has better reviews, BT1 or OBD2 Scanner | OBD Auto Doctor?
Do BT1 or OBD2 Scanner | OBD Auto Doctor have ads?
Which is updated more often, BT1 or OBD2 Scanner | OBD Auto Doctor?
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