# kong calculator vs SmartCalc+ Science Calculator

The clearest difference is in-app purchases: kong calculator at none against SmartCalc+ Science Calculator's 2. kong calculator also leads on update cadence (every 4 days vs every 5 weeks). On price, ads, device support and iOS requirement 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. kong calculator asks for nothing beyond the download.

kong calculator ships an update every 4 days, SmartCalc+ Science Calculator every 5 weeks. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | kong calculator | SmartCalc+ Science Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 4 days** | Every 5 weeks |
| Size | 20 MB | 9 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Changyeol Seo](https://appshunter.io/developer/551904752) | [Retenica SP Z.O.O](https://appshunter.io/developer/1715674718) |

## What reviewers say

### kong calculator

[App page](https://appshunter.io/ios/app/kong-calculator/id1594969449)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is kong calculator free?

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

### Is SmartCalc+ Science Calculator free?

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

### Do kong calculator or SmartCalc+ Science Calculator have ads?

Both kong calculator and SmartCalc+ Science Calculator show ads.

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

kong calculator ships an update every 4 days, and SmartCalc+ Science Calculator every 5 weeks. Most recently, kong calculator was updated on November 3, 2026 and SmartCalc+ Science Calculator on November 4, 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.*