# DiagonalOBDII vs CNC · G

The clearest difference is update cadence: CNC · G at every 2 days against DiagonalOBDII's every 2 weeks. CNC · G also leads on iOS requirement (16.4 vs 18.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. DiagonalOBDII sells 4 in-app purchases, starting at $12.99 per month and CNC · G sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

DiagonalOBDII ships an update every 2 weeks, CNC · G every 2 days. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | DiagonalOBDII | CNC · G |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/diagonalobdii/id6743419784/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 21 MB | 94 MB |
| Requires iOS | 18.1 | **16.4** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Kyle Louderback](https://appshunter.io/developer/1400068218) | [silverio valerio brandao](https://appshunter.io/developer/6795643335) |

## What reviewers say

### DiagonalOBDII

[App page](https://appshunter.io/ios/app/diagonalobdii/id6743419784)

This app helps mechanics perform vehicle drive cycles more efficiently. It provides real-time monitoring of emissions monitors and diagnostic trouble codes (DTCs), offering clear guidance and instant explanations to ensure vehicles pass inspection quickly and accurately.

**Highlights:** Live drive cycle monitoring, Immediate diagnostic trouble code (DTC) identification, Real-time emissions monitor status, Precise drive cycle parameter guidance, Professional, easy-to-navigate dashboard, Instant code explanations

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Diagonal Premium Monthly | $12.99 | per month |
| Diagonal Premium Trial | $12.99 | per month |
| Shop Owner - Monthly | $17.99 | per month |
| Diagonal Premium Yearly | $99.99 | per year |


### CNC · G

[App page](https://appshunter.io/ios/app/cnc-g-code-help/id6795643333)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro — Tuo per sempre | $17.99 | one-time |


## Frequently asked questions

### Is DiagonalOBDII free?

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

### Is CNC · G free?

CNC · G is free to download, with in-app purchases available.

### Do DiagonalOBDII or CNC · G have ads?

Neither DiagonalOBDII nor CNC · G shows ads.

### Which is updated more often, DiagonalOBDII or CNC · G?

DiagonalOBDII ships an update every 2 weeks, and CNC · G every 2 days. Most recently, DiagonalOBDII was updated on October 22, 2026 and CNC · G on October 24, 2026.

---

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