# OBD Diagnostics vs RedlineAi

The clearest difference is ads: RedlineAi at none against OBD Diagnostics's shown. RedlineAi also leads on update cadence (every 2 days vs monthly) and iOS requirement (17.0 vs 26.2). On price, in-app purchases and device support there is nothing between them.

Both are free to download. OBD Diagnostics sells 1 one-off in-app purchase and RedlineAi sells 6 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

OBD Diagnostics ships an update monthly, RedlineAi every 2 days. The most recent releases landed on October 6, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | OBD Diagnostics | RedlineAi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/redlineai-ai-obd-diagnostics/id6785606784/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 2 days** |
| Monetization | — | Free with in-app purchases |
| Size | 23 MB | 15 MB |
| Requires iOS | 26.2 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [EJSmith](https://appshunter.io/developer/305393602) | [Kirolos Yacob](https://appshunter.io/developer/6785606786) |

## What reviewers say

### OBD Diagnostics

[App page](https://appshunter.io/ios/app/obd-diagnostics/id6759762253)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### RedlineAi

[App page](https://appshunter.io/ios/app/redlineai-ai-obd-diagnostics/id6785606784)

This app transforms your phone into a professional OBD-II scanner, providing AI-powered explanations for check-engine lights, repair cost estimates, and DIY repair guides. It also includes a recall checker and a vehicle maintenance tracker.

**Highlights:** AI-powered OBD-II diagnostics, Repair cost estimates, DIY repair guides, Recall checker, Vehicle maintenance tracker, Live engine data, Trouble code library

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Silver | $2.99 | per month |
| Gold | $19.99 | per month |
| Silver (Annual) | $29.99 | per year |
| Diamond | $34.99 | per month |
| Gold (Annual) | $199.99 | per year |
| Diamond (Annual) | $349.99 | per year |


## Frequently asked questions

### Is OBD Diagnostics free?

OBD Diagnostics is free to download, with in-app purchases available.

### Is RedlineAi free?

RedlineAi is free to download, with in-app purchases available.

### Do OBD Diagnostics or RedlineAi have ads?

OBD Diagnostics shows ads; RedlineAi does not.

### Which is updated more often, OBD Diagnostics or RedlineAi?

OBD Diagnostics ships an update monthly, and RedlineAi every 2 days. Most recently, OBD Diagnostics was updated on October 6, 2026 and RedlineAi on October 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*