# ZappID vs sci.calculator

The clearest difference is in-app purchases: ZappID at none against sci.calculator's 1. ZappID also leads on update cadence (every 4 days vs every 5 weeks) and iOS requirement (12.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. sci.calculator sells 1 one-off in-app purchase. ZappID asks for nothing beyond the download.

ZappID ships an update every 4 days, sci.calculator every 5 weeks. The most recent releases landed on September 15, 2026 and December 22, 2025 respectively.

## The numbers

| Metric | ZappID | sci.calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 5 weeks |
| Size | 11 MB | 49 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Fredrik Petersson](https://appshunter.io/developer/555276018) | [Yukihiro Shioya](https://appshunter.io/developer/1565306192) |

## What reviewers say

### ZappID

[App page](https://appshunter.io/ios/app/zappid/id1455029820)

**Features:** macOS Compatibility

**In-app purchases:** none


### sci.calculator

[App page](https://appshunter.io/ios/app/scicalculator/id1620728508)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| remove Ads | $1.99 | one-time |


## Frequently asked questions

### Is ZappID free?

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

### Is sci.calculator free?

sci.calculator is free to download, with in-app purchases available.

### Do ZappID or sci.calculator have ads?

Neither ZappID nor sci.calculator shows ads.

### Which is updated more often, ZappID or sci.calculator?

ZappID ships an update every 4 days, and sci.calculator every 5 weeks. Most recently, ZappID was updated on September 15, 2026 and sci.calculator on December 22, 2025.

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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.*