Comparison

NexzScan vs ChkOBD OBD2 Analyzer

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

Head to head
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.

About

ChkOBD OBD2 Analyzer

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
Read full description

ChkOBD let you connect your iPhone and iPad to your Car and view the most important Engine values in a very intuitive user interface in an appealing user-friendly way. ChkOBD connects wirelessly to an ELM237 enabled OBDII - Bluetooth adapter which is readily available from many 3rd party vendors. From this free application that let you have access to the basic “Engine Values”, you will have In-App purchase to access additional information such as : . Advanced Engine Values, an extended choice of sensors available on your car, that you can select and monitor. The available Engine Value from your car, are all listed in a “grey” mode, so, you will have no surprise of what you will get (or not get !) after the In App purchase . Smog Check Assistant, to know if your car will pass the next Smog Check at the state official station, or the App will let you know what needs to be fixed, before driving there, . VIN Analyzer, will let you know what information is in the “government file” from your car, including date and place of manufacturing, . Error Decoder and Reset, to know what is the current error that is in the Memory of the computer of your car and let you have a way to try to reset this error (Normally, it comes back on, if the cause of the error is not mechanically fixed). This is an error scan that is going through about 4'000 possible errors. Usually all these information will be read from all car that have been sold in the USA after 2005. The fact that these applications are offered from inside a free app, in our side, from this free app, we are able to check before any of your purchase, that your car and your Bluetooth adapter will be 100% compatible with these applications. We are using this technology to try to provide to our customers the best possible satisfaction.

Screenshots

NexzScan3 screens
ChkOBD OBD2 Analyzer4 screens

Verdict

The call

The clearest difference is rating: ChkOBD OBD2 Analyzer at 3.0 against NexzScan's 2.1. ChkOBD OBD2 Analyzer also leads on iOS requirement (13.0 vs 15.6). NexzScan's advantage is in-app purchases (none vs 4) and update cadence (every 3 weeks vs every 3 months). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. ChkOBD OBD2 Analyzer sells 4 in-app purchases, starting at $4.99 per month. NexzScan asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

ChkOBD OBD2 Analyzer holds the better App Store score, 3.0 against 2.1. That said, the two scores are not equally well evidenced: NexzScan has 27 ratings behind it against 4, so its average is the more settled of the two.

UpkeepUpdate frequency

NexzScan ships an update every 3 weeks, ChkOBD OBD2 Analyzer every 3 months. The most recent releases landed on October 25, 2026 and October 13, 2026 respectively.

Scorecard6 real differences · 4 level
NexzScan versus ChkOBD OBD2 Analyzer: the parameters behind the verdict, then further details
ParameterNexzScanChkOBD OBD2 Analyzer
PriceFreeFree
Rating2.1 (27 ratings)3.0 (4 ratings) — better
Positive reviews7.1% of reviews—
Number of ratings27 — better4
Update frequencyEvery 3 weeks — betterEvery 3 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.613.0 — better
Further details — not scored
Size142 MB63 MB
Age rating4+4+
Developer美泉 黄Check On-Board Diagnostics LLC

Customer experience

NexzScan

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

ChkOBD OBD2 Analyzer

All ratings4 ratings
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

NexzScan

No in-app purchases

4 purchases

ChkOBD OBD2 Analyzer

Subscriptions1
  • Smog Check Assistant$4.991 Month
One-time3
  • VIN Analyzer$1.99
  • Error Analyzer$2.99
  • Advance Engine Values$4.99

Questions

Is NexzScan free?
NexzScan 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, NexzScan or ChkOBD OBD2 Analyzer?
ChkOBD OBD2 Analyzer is rated higher. NexzScan averages 2.1 out of 5 from 27 ratings, while ChkOBD OBD2 Analyzer averages 3.0 from 4 ratings.
Do NexzScan or ChkOBD OBD2 Analyzer have ads?
Neither NexzScan nor ChkOBD OBD2 Analyzer shows ads.
Which is updated more often, NexzScan or ChkOBD OBD2 Analyzer?
NexzScan ships an update every 3 weeks, and ChkOBD OBD2 Analyzer every 3 months. Most recently, NexzScan was updated on October 25, 2026 and ChkOBD OBD2 Analyzer on October 13, 2026.

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