# SHv4 Calculator vs Klar App

The clearest difference is in-app purchases: SHv4 Calculator at none against Klar App's 1. SHv4 Calculator also leads on device support (3 vs 1) and iOS requirement (12.0 vs 17.0). Klar App's advantage is update cadence (every 2 weeks vs every 3 months). On price and ads there is nothing between them.

Both are free to download. Klar App sells 1 one-off in-app purchase. SHv4 Calculator asks for nothing beyond the download.

SHv4 Calculator ships an update every 3 months, Klar App every 2 weeks. The most recent releases landed on November 1, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | SHv4 Calculator | Klar App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/shv4-calculator/id979817071/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 1 MB | 6 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [HealTech Electronics Ltd.](https://appshunter.io/developer/979817070) | [Michel Cato](https://appshunter.io/developer/1895561703) |

## What reviewers say

### SHv4 Calculator

[App page](https://appshunter.io/ios/app/shv4-calculator/id979817071)

Calculate your vehicle's speedometer error and get setup instructions for a SpeedoHealer module. This free, ad-free tool helps correct inaccurate speed and odometer readings on most motorcycles and some cars. It offers troubleshooting information and is compatible with non-cable driven speedometers.

**Highlights:** Calculate speedometer error, Generate SpeedoHealer v4 setup instructions, Access troubleshooting information, Ad-free experience, Offline functionality, Compatible with most motorcycles and cars

**In-app purchases:** none


### Klar App

[App page](https://appshunter.io/ios/app/klar-app/id6767936951)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Klar | $2.99 | one-time |


## Frequently asked questions

### Is SHv4 Calculator free?

SHv4 Calculator is free to download, with no in-app purchases.

### Is Klar App free?

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

### Do SHv4 Calculator or Klar App have ads?

Neither SHv4 Calculator nor Klar App shows ads.

### Which is updated more often, SHv4 Calculator or Klar App?

SHv4 Calculator ships an update every 3 months, and Klar App every 2 weeks. Most recently, SHv4 Calculator was updated on November 1, 2026 and Klar App on October 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.*