# ModTest Pro vs Grindcalculator

The clearest difference is update cadence: Grindcalculator at every 4 days against ModTest Pro's every 2 months. Grindcalculator also leads on price ($6.99 vs $9.99). ModTest Pro's advantage is iOS requirement (13.0 vs 26.0). On ads, in-app purchases and device support there is nothing between them.

ModTest Pro costs $9.99 and Grindcalculator $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ModTest Pro ships an update every 2 months, Grindcalculator every 4 days. The most recent releases landed on October 31, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | ModTest Pro | Grindcalculator |
| --- | --- | --- |
| Price | $9.99 | **$6.99** |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/grindcalculator/id1660469778/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 84.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | — | Paid |
| Size | 26 MB | 9 MB |
| Requires iOS | **13.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Dohmann Engineering Services](https://appshunter.io/developer/401682475) | [RoWo UG](https://appshunter.io/developer/1660469780) |

## What reviewers say

### ModTest Pro

[App page](https://appshunter.io/ios/app/modtest-pro/id1552784932)

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

**In-app purchases:** none


### Grindcalculator

[App page](https://appshunter.io/ios/app/grindcalculator/id1660469778)

This tool simplifies knife sharpening by calculating the correct angle, eliminating the need for manual marking. Save custom sharpening angles and grinding wheel dimensions for consistent results across various brands and types of sharpening tools.

**Highlights:** Precise angle calculation, Eliminates manual marking, Save custom angles, Save grinding wheel dimensions, Supports all grinder brands, Offline functionality

**In-app purchases:** none


## Frequently asked questions

### Is ModTest Pro free?

ModTest Pro costs $9.99, with no in-app purchases.

### Is Grindcalculator free?

Grindcalculator costs $6.99, with no in-app purchases.

### Do ModTest Pro or Grindcalculator have ads?

Neither ModTest Pro nor Grindcalculator shows ads.

### Which is updated more often, ModTest Pro or Grindcalculator?

ModTest Pro ships an update every 2 months, and Grindcalculator every 4 days. Most recently, ModTest Pro was updated on October 31, 2026 and Grindcalculator on November 3, 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.*