Comparison

OBD2 Expert vs NexzScan

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

OBD2 Expert

Diagnose and monitor your vehicle's health by connecting an OBD2 adapter. View sensor data, read and reset trouble codes, and analyze diagnostic information. Developers can use it as a hardware simulator or protocol bridge.

Highlights
  • Vehicle diagnostics and monitoring
  • Read and reset diagnostic trouble codes (DTC)
  • View current sensor data
  • Analyze Mode 6 diagnostics
  • Load vehicle status files for testing
  • Share vehicle status data
  • BLE/WiFi OBD2 ScanTool simulator for developers
  • OBD2 protocol communication bridge
Features
Read full description

OBD2-Expert is the new competent solution for vehicle diagnostics and monitoring. === The Highlights === A) Reveal vehicle problems before visiting the garage. B) Load vehicle status files and try the functionality of the app. C) Share your vehicle status with others and discuss solutions. D) For developers: Use this app as BTLE-OBD2-ScanTool instead of an expensive hardware simulator. E) For learning: Use this app as BTLE/WiFi Bridge and inspect the protocol communication. === The Details === A) Reveal vehicle problems before visiting the garage. Connect an OBD2 WiFi or BLE adapter to your vehicle and select it from the app. View the current sensor data. Load the diagnostic trouble codes (DTC) and inspect the freeze frame data from when the error occured. The component monitoring can tell you about potential problems by showing contiguous and non-contiguous monitors as well as a detailed analysis of mode 6 diagnostics (if supported by your vehicle). If you can fix your vehicle yourself, reset the saved DTC. B) Load vehicle status files and try the functionality of the app. Tired of buying promising apps that don't work? Try this app for free by loading a vehicle status file instead of connecting it to an adapter. C) Share your vehicle status with others and discuss solutions. With this app, you can capture the state of your vehicle including all DTCs and sensor data – either for later diagnostics or to share with other people. D) For developers: Use this app as BLE-OBD2-ScanTool instead of an expensive hardware simulator. Are you developing an OBD2-ScanTool and not having access to dozens of vehicles with their protocols? This app can work as a BLE-OBD2-ScanTool adapter, sparing you the cost of a professional hardware simulator. E) For learning: Use this app as BTLE/WiFi Bridge and inspect the protocol communication. If you want to learn about the OBD2 protocol communication, you can use your BTLE dongle and bridge it via WiFi to another OBD2 app (this requires an iPad Pro where you can run two apps side-by-side or another physical phone or tablet). === Supported Bluetooth hardware === Please note that this App will _not_ work with Bluetooth 2.x or 3.x adapters! This is a hardware limitation which can't be changed. Many very cheap BTLE OBD2 adapters are not Bluetooth 4.0, so please be aware of that. === Closing Note === OBD2-Expert is not a oneshot project. We want to support and continually develop this app. Hold your breath for exciting coming features. Please use the Support-URL to communicate your feedback to us!

About

NexzScan

This tool helps diagnose car engine issues by connecting to your vehicle's OBD port. It provides detailed reports on error codes, their causes, and live data, making car repair more efficient and accessible. The app offers a user-friendly interface and comprehensive vehicle support.

Highlights
  • Read and clear engine codes
  • Detailed diagnosis reports
  • Customized live data display
  • Powerful DTC definition database
  • One-key app updates
  • Bluetooth 4.2 connection
Features
Read full description

NexzScan OBD2 Scanner is a high cost-effective, portable and professional tool which supports almost all gasoline cars after 2000 till now, making car repair easier. It is designed with VCI+ FREE App with powerful database and detailed diagnosis report, offering you not only the code definition, but a list of possible causes, greatly increases the repair efficiency. It is easy to operate, just plug the sensor to the OBD port and pair it with your phone through Bluetooth 4.2. From then on, do no need to worry about the Check Engine Light on anymore. Highlight: - High Cost-effective Device: Compared with the handheld tools and other scanners, NexzScan is designed with the character of higher cost-effective, more customized and user-friendly, saving you both time and money. - Enhanced OBD Diagnosis: Fully covers OBD diagnosis Modes, not only includes read & clear codes, freeze frame, but O2 sensor, Smog Check, Battery Test, MIL Status, etc. all available. - Detailed Diagnosis Report: For each DTC, the code definition as well as possible causes are listed clearly by simple and easy-to-understand explanation instead of confusing terms. - Powerful Database: Exclusively provides nearly 40K kinds DTC definition & vehicle information query, leading the industry. - Customized Live Data: Diversified live data display method: digital, dashboard and graph display. Meanwhile, you can merge multi-parameters in one graph and see how they affect each other. - Data Mange: Provides the platform to review the stored data in time, both images and videos. - One-Key Update in App: No PC, no USB, no SD card are needed. Click the upgrade information and update it into the latest version within the App in time. Features: -Bluetooth 4.2 fast and stable connection. -Support all standard OBD2 protocols: SAE_J1850(PWM,VPW), ISO_9141-2, ISO_14230-4(KWP, KWP-FAST), ISO_15765-4(CAN, CAN-B,CAN-C,CAN-D), SAE_J1939(CAN), USER1,USER2. -Wide vehicle coverage: Works on any gasoline car (Japan, Canada, US, EU, etc.)with standard OBD2 DLC,including 57 brands. -Codes reading: retrieves confirmed codes, pending codes and current codes. -Supports multi ECU code reading: from 7E8 to 7EF(including Engine, Transmission and other control modules). -Enhanced DTC analysis: code definition, code description, code symptoms, code causes listed clearly . -Clear and visualized UI: provides you with easy-to-operate guide, no confusing terms. Function: -Read and Clear Codes: Read and clear engine codes. -Freeze Frame: A snapshot of the vehicle when the code is stored. -Live Data: DIY diversified PID display methods and multi-parameters comparison. -O2 Sensor: Check the vehicle O2 sensor values. -Smog Check: Check if the vehicle is ready for a smog or emissions test. -MIL Status: Diagnose the car when the Malfunction Indicator Lamp is on. -Mode 6: Advanced test results (like misfire counts) for on-board diagnostic system monitors. -Battery Test: Show battery voltage and comment battery status.

Screenshots

OBD2 Expert4 screens
NexzScan3 screens

Verdict

The call

The clearest difference is rating: OBD2 Expert at 4.1 against NexzScan's 2.1. OBD2 Expert also leads on ratings volume (725 vs 27) and iOS requirement (9.3 vs 15.6). NexzScan's advantage is in-app purchases (none vs 4) and update cadence (every 3 weeks vs every 2 months). On price, review sentiment, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. OBD2 Expert sells 4 one-off in-app purchases. NexzScan asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

OBD2 Expert holds the better App Store score, 4.1 against 2.1. That said, the two scores are not equally well evidenced: OBD2 Expert has 725 ratings behind it against 27, so its average is the more settled of the two. Written reviews split almost evenly too, at 8% and 7% positive.

UpkeepUpdate frequency

OBD2 Expert ships an update every 2 months, NexzScan every 3 weeks. The most recent releases landed on October 13, 2026 and October 6, 2026 respectively.

Scorecard6 real differences · 4 level
OBD2 Expert versus NexzScan: the parameters behind the verdict, then further details
ParameterOBD2 ExpertNexzScan
PriceFreeFree
Rating4.1 (725 ratings) — better2.1 (27 ratings)
Positive reviews8.0% of reviews — better7.1% of reviews
Number of ratings725 — better27
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.3 — better15.6
Further details — not scored
Size17 MB141 MB
Age rating4+4+
DeveloperMichael Lauer美泉 黄

Customer experience

OBD2 Expert

All ratings724 ratings
Positive75.1%
Neutral5.0%
Negative19.9%
Written reviews199 reviews
Positive8.0%
Neutral1.5%
Negative90.5%

NexzScan

All ratings27 ratings
Positive25.9%
Neutral3.7%
Negative70.4%
Written reviews14 reviews
Positive7.1%
Neutral0.0%
Negative92.9%

Bugs and requests

OBD2 Expert

Reported bugs

3 issues
  • Freezes during use
  • Fails to recognize compatible OBD2 adapters
  • Inaccurate vehicle information detection

Requested features

4 requests
  • Add support for more vehicle models
  • Implement live data monitoring
  • Include ability to clear diagnostic codes
  • Provide free trial period to test functionality

NexzScan

Not enough reviews yet to summarise bugs or requests.

In-app purchases

4 purchases

OBD2 Expert

One-time4
  • Operation Mode Bridge$0.99
  • Operation Mode ScanTool$2.99
  • Operation Mode Simulator$4.99
Show 1 more
  • All Features$5.99
None

NexzScan

No in-app purchases

Questions

Is OBD2 Expert free?
OBD2 Expert is free to download, with in-app purchases available.
Is NexzScan free?
NexzScan is free to download, with no in-app purchases.
Which has better reviews, OBD2 Expert or NexzScan?
OBD2 Expert is rated higher. OBD2 Expert averages 4.1 out of 5 from 725 ratings, while NexzScan averages 2.1 from 27 ratings.
Do OBD2 Expert or NexzScan have ads?
Neither OBD2 Expert nor NexzScan shows ads.
Which is updated more often, OBD2 Expert or NexzScan?
OBD2 Expert ships an update every 2 months, and NexzScan every 3 weeks. Most recently, OBD2 Expert was updated on October 13, 2026 and NexzScan on October 6, 2026.

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