# OBD Compass vs Diagnose AI

The clearest difference is in-app purchases: OBD Compass at none against Diagnose AI's 2. OBD Compass also leads on update cadence (monthly vs every 4 months) and iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Diagnose AI sells 2 in-app purchases, starting at $2.99 per month. OBD Compass asks for nothing beyond the download.

OBD Compass ships an update monthly, Diagnose AI every 4 months. The most recent releases landed on October 16, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | OBD Compass | Diagnose AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/diagnose-ai/id6773086171/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 4 months |
| Monetization | — | Freemium |
| Size | 25 MB | 44 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [HK TOPDON TECHNOLOGY Co., LIMITED](https://appshunter.io/developer/1846276192) | [Shivansh Chhhabra](https://appshunter.io/developer/6773086173) |

## What reviewers say

### OBD Compass

[App page](https://appshunter.io/ios/app/obd-compass/id6758076036)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Diagnose AI

[App page](https://appshunter.io/ios/app/diagnose-ai/id6773086171)

This app transforms your phone into an automotive health assistant. It connects to your car's OBD-II system via Bluetooth to translate fault codes into plain English, offering AI-powered diagnostics and DIY action plans. Manage multiple vehicles and review scan history for informed repairs.

**Highlights:** AI-powered plain-English diagnostics, One-tap Bluetooth OBD-II scanning, DIY action plans and guidance, Multi-vehicle garage management, Full scan history, Premium dark automotive interface

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $2.99 | per month |
| Pro Yearly | $19.99 | per year |


## Frequently asked questions

### Is OBD Compass free?

OBD Compass is free to download, with no in-app purchases.

### Is Diagnose AI free?

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

### Do OBD Compass or Diagnose AI have ads?

Neither OBD Compass nor Diagnose AI shows ads.

### Which is updated more often, OBD Compass or Diagnose AI?

OBD Compass ships an update monthly, and Diagnose AI every 4 months. Most recently, OBD Compass was updated on October 16, 2026 and Diagnose AI on October 23, 2026.

---

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