Comparison

ChkOBD OBD2 Analyzer vs M100

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

Head to head
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.

About

M100

This application connects to your vehicle via Bluetooth to provide diagnostic and monitoring functions. It allows you to read and clear fault codes, analyze driving performance, and view instrument panel data. Supports multiple languages and operates on low power.

Highlights
  • Fault code reading and clearing
  • Instrument panel display
  • Performance testing
  • Driving analysis
  • Bluetooth 4.0 adapter support
  • Multi-language support
Features
Read full description

M100 is a car diagnostic and monitoring application,support English,Español,Русский,Deutsch,Français,日本語,中文. Through iPhone and iPad, use Bluetooth to communicate with the vehicle terminal to complete fault diagnosis and driving assistance functions. It has automobile detection and analysis functions such as fault code reading and clearing, instrument panel, performance test, and travel analysis. It also supports high-speed data transmission and has the advantages of low power consumption and ultra-power saving. caution: 1. Support the adapter that runs through Bluetooth 4.0. 2. The parameters supported by each vehicle are different, which has nothing to do with M100, but is related to the vehicle control unit.

Screenshots

ChkOBD OBD2 Analyzer4 screens
M1004 screens

Verdict

The call

The clearest difference is in-app purchases: M100 at none against ChkOBD OBD2 Analyzer's 4. M100 also leads on rating (3.3 vs 3.0) and update cadence (every 3 weeks vs every 3 months). On price, ratings volume, 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. M100 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

M100 holds the better App Store score, 3.3 against 3.0. Both are backed by a comparable volume of ratings — 4 and 6 respectively.

UpkeepUpdate frequency

ChkOBD OBD2 Analyzer ships an update every 3 months, M100 every 3 weeks. The most recent releases landed on October 13, 2026 and October 24, 2026 respectively.

Scorecard5 real differences · 4 level
ChkOBD OBD2 Analyzer versus M100: the parameters behind the verdict, then further details
ParameterChkOBD OBD2 AnalyzerM100
PriceFreeFree
Rating3.0 (4 ratings)3.3 (6 ratings) — better
Number of ratings46 — better
Update frequencyEvery 3 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.010.0 — better
Further details — not scored
Size63 MB97 MB
Age rating4+4+
DeveloperCheck On-Board Diagnostics LLCShenzhen Chaoyue Technology Development Co.,Ltd

Customer experience

ChkOBD OBD2 Analyzer

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

M100

All ratings6 ratings
Positive66.7%
Neutral0.0%
Negative33.3%

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
None

M100

No in-app purchases

Questions

Is ChkOBD OBD2 Analyzer free?
ChkOBD OBD2 Analyzer is free to download, with in-app purchases available.
Is M100 free?
M100 is free to download, with no in-app purchases.
Which has better reviews, ChkOBD OBD2 Analyzer or M100?
M100 is rated higher. ChkOBD OBD2 Analyzer averages 3.0 out of 5 from 4 ratings, while M100 averages 3.3 from 6 ratings.
Do ChkOBD OBD2 Analyzer or M100 have ads?
Neither ChkOBD OBD2 Analyzer nor M100 shows ads.
Which is updated more often, ChkOBD OBD2 Analyzer or M100?
ChkOBD OBD2 Analyzer ships an update every 3 months, and M100 every 3 weeks. Most recently, ChkOBD OBD2 Analyzer was updated on October 13, 2026 and M100 on October 24, 2026.

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