# Tire Size Calculator vs ThisKey

The clearest difference is in-app purchases: Tire Size Calculator at none against ThisKey's 3. Tire Size Calculator also leads on iOS requirement (12.0 vs 15.1). ThisKey's advantage is update cadence (every 5 days vs every 14 months). On price, ads and device support there is nothing between them.

Both are free to download. ThisKey sells 3 in-app purchases, starting at $14.99 per year. Tire Size Calculator asks for nothing beyond the download.

Tire Size Calculator ships an update every 14 months, ThisKey every 5 days. The most recent releases landed on November 7, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Tire Size Calculator | ThisKey |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.1 (7 ratings)](https://appshunter.io/ios/app/tire-size-calculator-upsize/id1590813057/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 5 days** |
| Monetization | Free | — |
| Size | 30 MB | 433 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gorasiya Vishal Nanjibhai](https://appshunter.io/developer/1287086933) | [peerapong Suddhapas](https://appshunter.io/developer/6806118704) |

## What reviewers say

### Tire Size Calculator

[App page](https://appshunter.io/ios/app/tire-size-calculator-upsize/id1590813057)

Calculate and compare tire sizes for your vehicle. This tool helps you understand the impact of different tire dimensions on performance and ensures your speedometer remains accurate after upgrades. It's designed for automotive enthusiasts and anyone looking to optimize their vehicle's setup.

**Highlights:** Accurate tire size calculations, Aspect ratio adjustments, Speedometer correction, Tire size comparison tool, User-friendly interface, Save and share configurations

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

**In-app purchases:** none


### ThisKey

[App page](https://appshunter.io/ios/app/thiskey/id6806118702)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ThisKey Annual | $14.99 | per year |
| 15-day Trial | Free | one-time |
| ThisKey Lifetime | $17.99 | one-time |


## Frequently asked questions

### Is Tire Size Calculator free?

Tire Size Calculator is free to download, with no in-app purchases.

### Is ThisKey free?

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

### Do Tire Size Calculator or ThisKey have ads?

Neither Tire Size Calculator nor ThisKey shows ads.

### Which is updated more often, Tire Size Calculator or ThisKey?

Tire Size Calculator ships an update every 14 months, and ThisKey every 5 days. Most recently, Tire Size Calculator was updated on November 7, 2026 and ThisKey on November 6, 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.*