# OBDify vs Check Engine

The clearest difference is update cadence: OBDify at every 4 days against Check Engine's every 2 weeks. Check Engine's advantage is iOS requirement (16.4 vs 18.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. OBDify sells 4 in-app purchases, starting at $4.99 per 7 days and Check Engine sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

OBDify ships an update every 4 days, Check Engine every 2 weeks. The most recent releases landed on October 9, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | OBDify | Check Engine |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 2 weeks |
| Size | 19 MB | 48 MB |
| Requires iOS | 18.2 | **16.4** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Oleksandr Zhuryk](https://appshunter.io/developer/1892968311) | [REIDT GAVIN WILDE](https://appshunter.io/developer/6787276656) |

## What reviewers say

### OBDify

[App page](https://appshunter.io/ios/app/obdify-obd2-car-scanner/id6762113465)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OBDify Premium | $4.99 | per 7 days |
| OBDify Pro | $9.99 | per month |
| OBDify Premium | $59.99 | per year |
| Lifetime Diagnostics | $19.99 | one-time |


### Check Engine

[App page](https://appshunter.io/ios/app/check-engine-ai-engine-agent/id6787276654)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $9.99 | per month |
| Shop | $29.99 | per month |


## Frequently asked questions

### Is OBDify free?

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

### Is Check Engine free?

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

### Do OBDify or Check Engine have ads?

Neither OBDify nor Check Engine shows ads.

### Which is updated more often, OBDify or Check Engine?

OBDify ships an update every 4 days, and Check Engine every 2 weeks. Most recently, OBDify was updated on October 9, 2026 and Check Engine on October 15, 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.*