# Belt Length Calculator vs Frequency Conversion

The clearest difference is update cadence: Frequency Conversion at every 22 months against Belt Length Calculator's every 56 months. Belt Length Calculator's advantage is price ($1.99 vs $2.99). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

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

Belt Length Calculator ships an update every 56 months, Frequency Conversion every 22 months. The most recent releases landed on October 14, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Belt Length Calculator | Frequency Conversion |
| --- | --- | --- |
| Price | **$1.99** | $2.99 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 56 months | **Every 22 months** |
| Monetization | Paid | — |
| Size | 1 MB | 2 MB |
| Requires iOS | **16.1** | 17.6 |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Imran Pinjara](https://appshunter.io/developer/1484488781) | [Heng Jia Liang](https://appshunter.io/developer/1532000635) |

## What reviewers say

### Belt Length Calculator

[App page](https://appshunter.io/ios/app/belt-length-calculator/id1490691852)

Calculate the necessary length for drive system belts with this utility. Supports both open and cross belt arrangements, requiring only pulley diameters and center length for accurate results.

**Highlights:** Calculate belt length, Open belt arrangement, Cross belt arrangement, Input pulley diameters, Input center length

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

**In-app purchases:** none


### Frequency Conversion

[App page](https://appshunter.io/ios/app/frequency-conversion/id6444392460)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Belt Length Calculator free?

Belt Length Calculator costs $1.99, with no in-app purchases.

### Is Frequency Conversion free?

Frequency Conversion costs $2.99, with no in-app purchases.

### Do Belt Length Calculator or Frequency Conversion have ads?

Neither Belt Length Calculator nor Frequency Conversion shows ads.

### Which is updated more often, Belt Length Calculator or Frequency Conversion?

Belt Length Calculator ships an update every 56 months, and Frequency Conversion every 22 months. Most recently, Belt Length Calculator was updated on October 14, 2026 and Frequency Conversion on October 15, 2026.

---

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