# Hoffmann Machining Calculator vs Ear Prompter

The clearest difference is in-app purchases: Hoffmann Machining Calculator at none against Ear Prompter's 3. Hoffmann Machining Calculator also leads on iOS requirement (13.4 vs 26.0). Ear Prompter's advantage is update cadence (every 3 days vs every 6 months). On price, ads and device support there is nothing between them.

Both are free to download. Ear Prompter sells 3 in-app purchases, starting at $22.00 per 3 months. Hoffmann Machining Calculator asks for nothing beyond the download.

Hoffmann Machining Calculator ships an update every 6 months, Ear Prompter every 3 days. The most recent releases landed on October 5, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Hoffmann Machining Calculator | Ear Prompter |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 days** |
| Monetization | Free | — |
| Size | 24 MB | 26 MB |
| Requires iOS | **13.4** | 26.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hoffmann Group](https://appshunter.io/developer/537151540) | [noaman mangera](https://appshunter.io/developer/1803820501) |

## What reviewers say

### Hoffmann Machining Calculator

[App page](https://appshunter.io/ios/app/hoffmann-machining-calculator/id1450938067)

Calculate essential cutting and performance data for turning, drilling, and milling operations. This tool provides quick, offline access to crucial machining parameters, supporting various production methods with clear formulas and a user-friendly interface.

**Highlights:** Calculate cutting data for turning, drilling, milling, TPC milling parameter calculation, Forward and reverse calculations, Access to material database, Clear formulae with pictograms, Offline functionality

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

**In-app purchases:** none


### Ear Prompter

[App page](https://appshunter.io/ios/app/ear-prompter/id6811896503)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro quarterly | $22.00 | per 3 months |
| Pro yearly | $59.99 | per year |
| Pro (one payment) | $149.99 | one-time |


## Frequently asked questions

### Is Hoffmann Machining Calculator free?

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

### Is Ear Prompter free?

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

### Do Hoffmann Machining Calculator or Ear Prompter have ads?

Neither Hoffmann Machining Calculator nor Ear Prompter shows ads.

### Which is updated more often, Hoffmann Machining Calculator or Ear Prompter?

Hoffmann Machining Calculator ships an update every 6 months, and Ear Prompter every 3 days. Most recently, Hoffmann Machining Calculator was updated on October 5, 2026 and Ear Prompter on October 11, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*