# Fit Tolerance ISO Pro vs Thread Calculators

Fit Tolerance ISO Pro and Thread Calculators both sit at 5.0 stars, but that hides the real split: 100% of Thread Calculators's written reviews are positive against 50% of Fit Tolerance ISO Pro's. Thread Calculators also leads on iOS requirement (13.0 vs 15.0). Fit Tolerance ISO Pro's advantage is price ($0.99 vs $1.99). On rating, ratings volume, update cadence and ads there is nothing between them.

Fit Tolerance ISO Pro costs $0.99 and Thread Calculators $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Fit Tolerance ISO Pro against 5.0 for Thread Calculators. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews are what separate them: 50% of Fit Tolerance ISO Pro's written reviews are positive against 100% of Thread Calculators's.

Fit Tolerance ISO Pro ships an update every 12 months, Thread Calculators every 10 months. The most recent releases landed on August 14, 2026 and August 1, 2026 respectively.

## The numbers

| Metric | Fit Tolerance ISO Pro | Thread Calculators |
| --- | --- | --- |
| Price | **$0.99** | $1.99 |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/fit-tolerance-iso-pro/id1397159146/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/thread-calculators/id1670586227/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 10 months** |
| Monetization | Paid | Paid |
| Size | 47 MB | 51 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yasar Yucel Yesilbag](https://appshunter.io/developer/1251895011) | [Kantaben Gorasiya](https://appshunter.io/developer/1640260396) |

## What reviewers say

### Fit Tolerance ISO Pro

[App page](https://appshunter.io/ios/app/fit-tolerance-iso-pro/id1397159146)

Calculate engineering tolerances for various mechanical components like bearings, shafts, and housings. It adheres to ISO and ANSI standards, providing size limits, deviations, and fit types. Visual representations of fits are also generated.

**Highlights:** Calculate engineering tolerances, Supports ISO and ANSI standards, Determines clearance, transition, and interference fits, Provides schematic fit representations, Includes preferred tolerances and fits, Calculates size limits and deviations

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

**In-app purchases:** none


### Thread Calculators

[App page](https://appshunter.io/ios/app/thread-calculators/id1670586227)

This app provides precise thread-cutting data for various international standards. It assists machinists, engineers, and CNC professionals in quickly finding essential measurements and detailed tables for thread dimensions and cutting values.

**Highlights:** Supports international thread standards (M, UNC, NPT, etc.), Tap Hole Size Calculator, Bolt Diameter Guide, Tap Hole Forming Data, Tap Hole Repair Values, Detailed thread dimension tables

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

**In-app purchases:** none


## Frequently asked questions

### Is Fit Tolerance ISO Pro free?

Fit Tolerance ISO Pro costs $0.99, with no in-app purchases.

### Is Thread Calculators free?

Thread Calculators costs $1.99, with no in-app purchases.

### Which has better reviews, Fit Tolerance ISO Pro or Thread Calculators?

Fit Tolerance ISO Pro and Thread Calculators are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Fit Tolerance ISO Pro or Thread Calculators have ads?

Neither Fit Tolerance ISO Pro nor Thread Calculators shows ads.

### Which is updated more often, Fit Tolerance ISO Pro or Thread Calculators?

Fit Tolerance ISO Pro ships an update every 12 months, and Thread Calculators every 10 months. Most recently, Fit Tolerance ISO Pro was updated on August 14, 2026 and Thread Calculators on August 1, 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.*