# IEQ Calculator(Office) vs PolyU Library

The clearest difference is update cadence: PolyU Library at every 3 months against IEQ Calculator(Office)'s every 35 months. On price, ads, in-app purchases and device support there is nothing between them.

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

IEQ Calculator(Office) ships an update every 35 months, PolyU Library every 3 months. The most recent releases landed on October 1, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | IEQ Calculator(Office) | PolyU Library |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 35 months | **Every 3 months** |
| Size | 1 MB | 35 MB |
| Requires iOS | **14.4** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Fishball Studio](https://appshunter.io/developer/418104683) | [The Hong Kong Polytechnic University](https://appshunter.io/developer/442903588) |

## What reviewers say

### IEQ Calculator(Office)

[App page](https://appshunter.io/ios/app/ieq-calculatoroffice/id443713768)

**Features:** macOS Compatibility

**In-app purchases:** none


### PolyU Library

[App page](https://appshunter.io/ios/app/polyu-library/id6450161237)

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

**In-app purchases:** none


## Frequently asked questions

### Is IEQ Calculator(Office) free?

IEQ Calculator(Office) is free to download, with no in-app purchases.

### Is PolyU Library free?

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

### Do IEQ Calculator(Office) or PolyU Library have ads?

Neither IEQ Calculator(Office) nor PolyU Library shows ads.

### Which is updated more often, IEQ Calculator(Office) or PolyU Library?

IEQ Calculator(Office) ships an update every 35 months, and PolyU Library every 3 months. Most recently, IEQ Calculator(Office) was updated on October 1, 2026 and PolyU Library on September 28, 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.*