# eCall Pro vs SI Calculator Pro

The clearest difference is update cadence: eCall Pro at every 3 months against SI Calculator Pro's every 10 months. SI Calculator Pro's advantage is device support (3 vs 1) and iOS requirement (12.4 vs 16.0). On price and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

eCall Pro ships an update every 3 months, SI Calculator Pro every 10 months. The most recent releases landed on October 16, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | eCall Pro | SI Calculator Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | **Every 3 months** | Every 10 months |
| Size | 9 MB | 15 MB |
| Requires iOS | 16.0 | **12.4** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Otis Elevator Company](https://appshunter.io/developer/992577451) | [Select Chemicals Limited](https://appshunter.io/developer/1538878240) |

## What reviewers say

### eCall Pro

[App page](https://appshunter.io/ios/app/ecall-pro/id1561992694)

**In-app purchases:** none


### SI Calculator Pro

[App page](https://appshunter.io/ios/app/si-calculator-pro/id1568227316)

**In-app purchases:** none


## Frequently asked questions

### Is eCall Pro free?

eCall Pro is free to download, with no in-app purchases.

### Is SI Calculator Pro free?

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

### Which is updated more often, eCall Pro or SI Calculator Pro?

eCall Pro ships an update every 3 months, and SI Calculator Pro every 10 months. Most recently, eCall Pro was updated on October 16, 2026 and SI Calculator Pro on October 27, 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.*