Best ELM327 OBD2 apps in 2025: Free and Paid!

I am a big fan of Bluetooth OBD2 scanners and have used them for a few years. There are literally hundreds of different apps, and most of them ask you to buy the pro version even to use basic functionality.

I combined my long-term experiences with a few days of testing these OBD apps one after another and came up with a list of the best free and best apps worth paying for.

VIDEO: Best OBD2 apps overview

Who tested product & wrote this review?

Tester & Editor for this review: Juraj Lukacko

Hello, I am Juraj (Yuri) and I tested this product to help you decide if it is something you would want to buy, and if yes, show you how to use it.

I make honest reviews based on personal testing in my own garage and If I see the product is bad, I will make it very clear in review.

Read more about how I do reviews on Iamcarhacker.com in my review policy.

What are the best OBD2 apps?

I tried to pick the best app in multiple categories and avoid spamming very similar apps in this list. There are apps for diagnosing and customization, but also ones that will ease you up working with your Bluetooth OBD scanner.

I tested a lot of different Bluetooth OBD scanners

I tested more than 30 different Bluetooth OBD scanners, so the review is crafted based on the level of value it can give you for money spent. Here is a list of the Best Bluetooth OBD scanners.

1. OBD Connector – OBD2 port location

OBD connector is a database of OBD port locations in different car models. When you start using your Bluetooth scan tool, you might not know where to look for the DLC (data link connector).

It can also be useful for mechanics to locate the plug quickly. While the cars often share a common location under the dashboard on the driver’s side, this is not the case for all models. This connector app will save you some time when connecting the OBD adapter.

2. ELM scan identifier – OBD2 adapter info

ELM scan identifier will tell you which version of ELM your adapter uses. There are many adapters, and many of them use clone ELM 327 chip. ELM identifier will tell you if your adapter has a genuine or clone chip in it and also which version it is.

Having a clone chip in a ELM327 adapter doesn’t have to be bad; some of them work without any trouble.

The Veepeak also uses a clone chip but supports all OBD protocols, and I was able to connect it with all these apps without any trouble. The app will also measure the adapter speed. OBDLink, for example, has a response speed of 5ms, while Veepeak’s speed is around 18ms.

3. Car Scanner ELM OBD2 – Diagnosing/Coding

As I said in the intro, this article won’t show 10 similar apps like others on the internet, where the author scraps 10 similar apps to diagnose vehicles. There is no point in featuring other free/cheap OBD2 apps because the Car Scanner ELM OBD2 is the best of all. It even has a Demo version; you can download it now and try it without connecting to the car.

The app packs the functionality of a basic code reader, like a reading engine, and live data from the engine but expands it with several other functions. It can scan all other control modules for fault codes, display multiple live data graphs, and even do ECU coding (unlock hidden features) for certain models. And all that for $ 5-lifetime pro access or a little less functionality for free.

4. DTC Fix – OBD codes description

DTC fix will give you a description of OBD fault codes and add possible causes. While almost any scanner can show you the description, almost none will tell you possible parts causing this problem, so you have some starting points with your diagnostic process.

This app is kind of old, nowadays you can have similar think directly on wordpress-1476291-6101439.cloudwaysapps.com main page, there is a DTC lookup with explanation and full guide on how to solve your fault.

5. Carista – ECU coding

The Carista app offers both diagnostic and coding functionality for some car brands. The free version of Carista is pretty much useless since it only reads codes; you can do more with the Car Scanner app.

The premium version of Carista still isn’t the best diagnostic tool; it is also worse than the Car Scanner app in terms of live data. Reading faults is the same. The best use of the Carista app is to code vehicle features. You can buy 1 month for $10, code the features, cancel the subscription, and use other apps for diagnosing.

6. Dr. Hybrid – Hybrid battery data

“Dr. Hybrid” or “Dr. Prius” is a mobile application designed to monitor and analyze data from hybrid vehicles, particularly those equipped with an OBD2 (On-Board Diagnostics) port. The OBD2 port is a standard diagnostic interface found in most modern vehicles, including hybrids.

They can display information such as fuel economy, battery usage, engine performance, hybrid system status, and other diagnostic details.

Best OBD2 scanners in 2025

I constantly test new OBD-II scanners to give you the best options possible. Here is a full list of the best tools in all categories currently.