# HONDAtabase vs Racing Diffs

The clearest difference is rating: HONDAtabase at 4.6 against Racing Diffs's 2.5. HONDAtabase also leads on ratings volume (32 vs 2). Racing Diffs's advantage is ads (none vs shown). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

HONDAtabase holds the better App Store score, 4.6 against 2.5. That said, the two scores are not equally well evidenced: HONDAtabase has 32 ratings behind it against 2, so its average is the more settled of the two.

HONDAtabase ships an update every 3 weeks, Racing Diffs every 5 weeks. The most recent releases landed on October 24, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | HONDAtabase | Racing Diffs |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (32 ratings)](https://appshunter.io/ios/app/hondatabase/id1421957481/reviews)** | [2.5 (2 ratings)](https://appshunter.io/ios/app/racing-diffs-gear-ratio/id1554897307/reviews) |
| Number of ratings | **32** | 2 |
| Positive reviews | 72.7% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 5 weeks |
| Monetization | Free | Free |
| Size | 93 MB | 6 MB |
| Requires iOS | 15.0 | **14.4** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Peter Linszter](https://appshunter.io/developer/530077583) | [Imperio](https://appshunter.io/developer/521569345) |

## What reviewers say

### HONDAtabase

[App page](https://appshunter.io/ios/app/hondatabase/id1421957481)

Access detailed specifications for various Honda engine series, including A-, B-, C-, D-, F-, G-, H-, J-, K-, L-, N-, and R-Series. It also provides OBD0/OBD1/OBD2 ECU fault codes, transmission specs, ECU pinouts, and a bearing thickness chart.

**Highlights:** Honda engine series specifications, OBD ECU fault codes, Transmission specifications, ECU list and pinouts, Bearing thickness chart

**Features:** macOS Compatibility

**In-app purchases:** none


### Racing Diffs

[App page](https://appshunter.io/ios/app/racing-diffs-gear-ratio/id1554897307)

Calculate your vehicle's top speed for each gear using transmission ratios, differential gear ratio, and rev limit. Optimize your car's gear ratio for track performance or drag racing, choosing between kmh and mph units.

**Highlights:** Top speed calculation per gear, Input tire dimensions, Input transmission gear ratios, Input final drive ratio, Input rev limit, Supports kmh and mph

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

**In-app purchases:** none


## Frequently asked questions

### Is HONDAtabase free?

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

### Is Racing Diffs free?

Racing Diffs is free to download, with no in-app purchases.

### Which has better reviews, HONDAtabase or Racing Diffs?

HONDAtabase is rated higher. HONDAtabase averages 4.6 out of 5 from 32 ratings, while Racing Diffs averages 2.5 from 2 ratings.

### Do HONDAtabase or Racing Diffs have ads?

HONDAtabase shows ads; Racing Diffs does not.

### Which is updated more often, HONDAtabase or Racing Diffs?

HONDAtabase ships an update every 3 weeks, and Racing Diffs every 5 weeks. Most recently, HONDAtabase was updated on October 24, 2026 and Racing Diffs on October 13, 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.*