# SCRCalc vs ZCRE

The clearest difference is price: ZCRE at Free against SCRCalc's $0.99. ZCRE also leads on update cadence (daily vs every 9 months) and iOS requirement (11.0 vs 27.0). On ads, in-app purchases and device support there is nothing between them.

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

SCRCalc ships an update every 9 months, ZCRE daily. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | SCRCalc | ZCRE |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Daily** |
| Monetization | Paid | — |
| Size | 1 MB | 2 MB |
| Requires iOS | 27.0 | **11.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Office Proteus](https://appshunter.io/developer/376643421) | [Antonio Fernandez Herruzo](https://appshunter.io/developer/740513896) |

## What reviewers say

### SCRCalc

[App page](https://appshunter.io/ios/app/scrcalc/id376643418)

Easily calculate your Surface Consumption Rate (SCR) for scuba diving without memorizing complex formulas. Input your data and get your SCR instantly, helping you track your consumption and potentially impress dive guides.

**Highlights:** Calculate SCR for scuba diving, No need to memorize formulas, Easy data input, Track air consumption, Impress dive guides

**Features:** Vision Pro support

**In-app purchases:** none


### ZCRE

[App page](https://appshunter.io/ios/app/zcre/id1542825100)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SCRCalc free?

SCRCalc costs $0.99, with no in-app purchases.

### Is ZCRE free?

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

### Do SCRCalc or ZCRE have ads?

Neither SCRCalc nor ZCRE shows ads.

### Which is updated more often, SCRCalc or ZCRE?

SCRCalc ships an update every 9 months, and ZCRE daily. Most recently, SCRCalc was updated on October 29, 2026 and ZCRE on October 27, 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.*