# Kegel Pattern Library vs DiagonalOBDII

The clearest difference is rating: DiagonalOBDII at 5.0 against Kegel Pattern Library's 2.6. DiagonalOBDII also leads on update cadence (every 2 weeks vs every 5 months). Kegel Pattern Library's advantage is in-app purchases (none vs 4) and review sentiment (25% vs 0%). On price and ads there is nothing between them.

Both are free to download. DiagonalOBDII sells 4 in-app purchases, starting at $12.99 per month. Kegel Pattern Library asks for nothing beyond the download.

DiagonalOBDII holds the better App Store score, 5.0 against 2.6. That said, the two scores are not equally well evidenced: Kegel Pattern Library has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 25% of Kegel Pattern Library's written reviews are positive against 0% of DiagonalOBDII's, so the app with the better star average is not the one people write more warmly about.

Kegel Pattern Library ships an update every 5 months, DiagonalOBDII every 2 weeks. The most recent releases landed on June 1, 2026 and August 22, 2026 respectively.

## The numbers

| Metric | Kegel Pattern Library | DiagonalOBDII |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.6 (5 ratings)](https://appshunter.io/ios/app/kegel-pattern-library/id1239558477/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/diagonalobdii/id6743419784/reviews)** |
| Number of ratings | **5** | 1 |
| Positive reviews | **25.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 143 MB | 21 MB |
| Requires iOS | **13.0** | 18.1 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Kegel LLC](https://appshunter.io/developer/1229220083) | [Kyle Louderback](https://appshunter.io/developer/1400068218) |

## What reviewers say

### Kegel Pattern Library

[App page](https://appshunter.io/ios/app/kegel-pattern-library/id1239558477)

Browse and view bowling lane patterns directly from your mobile device. Transmit these patterns to compatible Kegel Lane Machines wirelessly. Requires specific hardware for pattern transmission.

**Highlights:** Browse lane patterns, View lane patterns, Transmit patterns wirelessly, Compatible with specific Kegel machines, Mobile pattern management

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Kegel Pattern Library free?

Kegel Pattern Library is free to download, with no in-app purchases.

### Is DiagonalOBDII free?

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

### Which has better reviews, Kegel Pattern Library or DiagonalOBDII?

DiagonalOBDII is rated higher. Kegel Pattern Library averages 2.6 out of 5 from 5 ratings, while DiagonalOBDII averages 5.0 from 1 ratings.

### Do Kegel Pattern Library or DiagonalOBDII have ads?

Neither Kegel Pattern Library nor DiagonalOBDII shows ads.

### Which is updated more often, Kegel Pattern Library or DiagonalOBDII?

Kegel Pattern Library ships an update every 5 months, and DiagonalOBDII every 2 weeks. Most recently, Kegel Pattern Library was updated on June 1, 2026 and DiagonalOBDII on August 22, 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.*