# Catenary Cables vs SI Converter

The clearest difference is in-app purchases: SI Converter at none against Catenary Cables's 2. Catenary Cables's advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Catenary Cables sells 2 in-app purchases, starting at $59.99 per month. SI Converter asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 8, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | Catenary Cables | SI Converter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/catenary-cables/id6447140970/reviews)** | — |
| Number of ratings | **6** | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Subscription | — |
| Size | 31 MB | 4 MB |
| Requires iOS | **16.0** | 17.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Logan Copenhaver](https://appshunter.io/developer/1680415210) | [Ramon A. Marchante Castellanos](https://appshunter.io/developer/1735326162) |

## What reviewers say

### Catenary Cables

[App page](https://appshunter.io/ios/app/catenary-cables/id6447140970)

This app provides a more accurate and efficient method for calculating the sagging of overhead transmission line conductors. It replaces traditional approximate parabolic equations with precise catenary expressions, saving time and improving accuracy.

**Highlights:** Accurate sag calculations, Precise catenary expressions, Replaces traditional methods, Flexible transit setup, Time-saving efficiency

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $59.99 | per month |
| Yearly | $539.99 | per year |


### SI Converter

[App page](https://appshunter.io/ios/app/si-converter/id6504356195)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Catenary Cables free?

Catenary Cables is free to download, with in-app purchases available.

### Is SI Converter free?

SI Converter is free to download, with no in-app purchases.

### Do Catenary Cables or SI Converter have ads?

SI Converter shows ads; Catenary Cables does not.

### Which is updated more often, Catenary Cables or SI Converter?

Catenary Cables ships an update every 2 months, and SI Converter every 2 months. Most recently, Catenary Cables was updated on September 8, 2026 and SI Converter on May 16, 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.*