# ISO Fits vs Hoffmann Machining Calculator

The clearest difference is review sentiment: ISO Fits at 95% against Hoffmann Machining Calculator's 57%. Hoffmann Machining Calculator's advantage is in-app purchases (none vs 1) and iOS requirement (13.4 vs 15.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. ISO Fits sells 1 one-off in-app purchase. Hoffmann Machining Calculator asks for nothing beyond the download.

ISO Fits ships an update every 5 months, Hoffmann Machining Calculator every 6 months. The most recent releases landed on September 12, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | ISO Fits | Hoffmann Machining Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (6 ratings)](https://appshunter.io/ios/app/iso-fits/id396863755/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | **94.6% of reviews** | 57.1% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 6 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 66 MB | 24 MB |
| Requires iOS | 15.6 | **13.4** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) | [Hoffmann Group](https://appshunter.io/developer/537151540) |

## What reviewers say

### ISO Fits

[App page](https://appshunter.io/ios/app/iso-fits/id396863755)

Calculate ISO fits and tolerances for shafts and bores. Supports metric and inch units, displays detailed fit definitions, and includes visual charts and educational videos.

**Highlights:** ISO fits calculation, Tolerance class display, Metric/inch unit switching, Tolerance charts, Updated YouTube videos

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version with complete ISO286 Standard | $1.99 | one-time |


### 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


## Frequently asked questions

### Is ISO Fits free?

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

### Is Hoffmann Machining Calculator free?

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

### Do ISO Fits or Hoffmann Machining Calculator have ads?

Neither ISO Fits nor Hoffmann Machining Calculator shows ads.

### Which is updated more often, ISO Fits or Hoffmann Machining Calculator?

ISO Fits ships an update every 5 months, and Hoffmann Machining Calculator every 6 months. Most recently, ISO Fits was updated on September 12, 2026 and Hoffmann Machining Calculator on September 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.*