# ISO Fits vs ThreadFon Multi

The clearest difference is in-app purchases: ThreadFon Multi at none against ISO Fits's 1. ThreadFon Multi also leads on update cadence (monthly vs every 5 months) and iOS requirement (12.0 vs 15.6). ISO Fits's advantage is rating (4.2 vs 3.8) and review sentiment (95% vs 80%). On price, ratings volume, ads and device support there is nothing between them.

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

ISO Fits holds the better App Store score, 4.2 against 3.8. Both are backed by a comparable volume of ratings — 6 and 4 respectively. Written reviews point the same way: 95% of ISO Fits's written reviews are positive against 80% of ThreadFon Multi's.

ISO Fits ships an update every 5 months, ThreadFon Multi monthly. The most recent releases landed on October 9, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | ISO Fits | ThreadFon Multi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (6 ratings)](https://appshunter.io/ios/app/iso-fits/id396863755/reviews)** | [3.8 (4 ratings)](https://appshunter.io/ios/app/threadfon-multi-thread-calc/id1602169811/reviews) |
| Number of ratings | **6** | 4 |
| Positive reviews | **94.6% of reviews** | 80.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Monthly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 66 MB | 43 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) | [Dmitriy Trofimov](https://appshunter.io/developer/1598378710) |

## 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 |


### ThreadFon Multi

[App page](https://appshunter.io/ios/app/threadfon-multi-thread-calc/id1602169811)

This tool provides detailed insights into metric, inch, pipe, and trapezoidal cylindrical threads based on ISO and ASME standards. It helps users efficiently determine essential thread specifications for various thread types.

**Highlights:** ISO Metric thread support, Unified Inch thread support, Pipe thread support, Trapezoidal thread support, Based on ISO 965 and ASME B1.1 standards, Determines fundamental thread parameters

**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 ThreadFon Multi free?

ThreadFon Multi is free to download, with no in-app purchases.

### Which has better reviews, ISO Fits or ThreadFon Multi?

ISO Fits is rated higher. ISO Fits averages 4.2 out of 5 from 6 ratings, while ThreadFon Multi averages 3.8 from 4 ratings.

### Do ISO Fits or ThreadFon Multi have ads?

Neither ISO Fits nor ThreadFon Multi shows ads.

### Which is updated more often, ISO Fits or ThreadFon Multi?

ISO Fits ships an update every 5 months, and ThreadFon Multi monthly. Most recently, ISO Fits was updated on October 9, 2026 and ThreadFon Multi on October 11, 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.*