# Belt Length Calculator Pro vs Thread Calculators

The clearest difference is review sentiment: Thread Calculators at 100% against Belt Length Calculator Pro's 25%. Thread Calculators also leads on rating (5.0 vs 2.3) and update cadence (every 10 months vs every 41 months). Belt Length Calculator Pro's advantage is ratings volume (3 vs 1). On ads, in-app purchases, monetization model and device support there is nothing between them.

Belt Length Calculator Pro costs $2.99 and Thread Calculators $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Thread Calculators holds the better App Store score, 5.0 against 2.3. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews point the same way: 25% of Belt Length Calculator Pro's written reviews are positive against 100% of Thread Calculators's.

Belt Length Calculator Pro ships an update every 41 months, Thread Calculators every 10 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Belt Length Calculator Pro | Thread Calculators |
| --- | --- | --- |
| Price | $2.99 | **$1.99** |
| Rating | [2.3 (3 ratings)](https://appshunter.io/ios/app/belt-length-calculator-pro/id1487292230/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/thread-calculators/id1670586227/reviews)** |
| Number of ratings | **3** | 1 |
| Positive reviews | 25.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 41 months | **Every 10 months** |
| Monetization | Paid | Paid |
| Size | 1 MB | 51 MB |
| Requires iOS | 16.1 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Imran Pinjara](https://appshunter.io/developer/1484488781) | [Kantaben Gorasiya](https://appshunter.io/developer/1640260396) |

## What reviewers say

### Belt Length Calculator Pro

[App page](https://appshunter.io/ios/app/belt-length-calculator-pro/id1487292230)

Calculate the required belt length for drive systems using open or cross belt arrangements. Input pulley diameters and center distance to get the precise belt length needed.

**Highlights:** Open belt arrangement calculation, Cross belt arrangement calculation, Input large pulley diameter, Input small pulley diameter, Input center length of pulleys, Provides belt length output

**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 Belt Length Calculator Pro free?

Belt Length Calculator Pro costs $2.99, with no in-app purchases.

### Is Thread Calculators free?

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

### Which has better reviews, Belt Length Calculator Pro or Thread Calculators?

Thread Calculators is rated higher. Belt Length Calculator Pro averages 2.3 out of 5 from 3 ratings, while Thread Calculators averages 5.0 from 1 ratings.

### Do Belt Length Calculator Pro or Thread Calculators have ads?

Neither Belt Length Calculator Pro nor Thread Calculators shows ads.

### Which is updated more often, Belt Length Calculator Pro or Thread Calculators?

Belt Length Calculator Pro ships an update every 41 months, and Thread Calculators every 10 months. Most recently, Belt Length Calculator Pro was updated on November 3, 2026 and Thread Calculators 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.*