# Attendia vs Engineering Calculator

The clearest difference is price: Attendia at Free against Engineering Calculator's $0.99. Engineering Calculator's advantage is update cadence (every 2 days vs weekly). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Attendia is free to download; Engineering Calculator costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Attendia ships an update weekly, Engineering Calculator every 2 days. Both last shipped on October 3, 2026.

## The numbers

| Metric | Attendia | Engineering Calculator |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | **Every 2 days** |
| Size | 45 MB | 21 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [IBTC](https://appshunter.io/developer/1781189002) | [Yasin Demir](https://appshunter.io/developer/1838444361) |

## What reviewers say

### Attendia

[App page](https://appshunter.io/ios/app/attendia/id6758048137)

**Features:** Vision Pro support

**In-app purchases:** none


### Engineering Calculator

[App page](https://appshunter.io/ios/app/engineering-calculator/id6761010498)

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

**In-app purchases:** none


## Frequently asked questions

### Is Attendia free?

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

### Is Engineering Calculator free?

Engineering Calculator costs $0.99, with no in-app purchases.

### Do Attendia or Engineering Calculator have ads?

Neither Attendia nor Engineering Calculator shows ads.

### Which is updated more often, Attendia or Engineering Calculator?

Attendia ships an update weekly, and Engineering Calculator every 2 days. Most recently, Attendia was updated on October 3, 2026 and Engineering Calculator on October 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.*