# SmartCalc+ Science Calculator vs HR

The clearest difference is in-app purchases: HR at none against SmartCalc+ Science Calculator's 2. HR also leads on ads (none vs shown) and update cadence (every 5 days vs every 5 weeks). On price and device support there is nothing between them.

Both are free to download. SmartCalc+ Science Calculator sells 2 in-app purchases, starting at $0.99 per 7 days. HR asks for nothing beyond the download.

SmartCalc+ Science Calculator ships an update every 5 weeks, HR every 5 days. The most recent releases landed on October 2, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | SmartCalc+ Science Calculator | HR |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Every 5 days** |
| Size | 9 MB | 41 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Retenica SP Z.O.O](https://appshunter.io/developer/1715674718) | [Polygram Solution Co., Ltd.](https://appshunter.io/developer/1732614931) |

## What reviewers say

### SmartCalc+ Science Calculator

[App page](https://appshunter.io/ios/app/smartcalc-plus-science-calculator/id6483847331)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium Access | $0.99 | per 7 days |
| Annual Premium Access | $9.99 | per year |


### HR

[App page](https://appshunter.io/ios/app/hr-mobile/id6758534513)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SmartCalc+ Science Calculator free?

SmartCalc+ Science Calculator is free to download, with in-app purchases available.

### Is HR free?

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

### Do SmartCalc+ Science Calculator or HR have ads?

SmartCalc+ Science Calculator shows ads; HR does not.

### Which is updated more often, SmartCalc+ Science Calculator or HR?

SmartCalc+ Science Calculator ships an update every 5 weeks, and HR every 5 days. Most recently, SmartCalc+ Science Calculator was updated on October 2, 2026 and HR on September 26, 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.*