# Ekofluid vs CalcKing Pro

The clearest difference is in-app purchases: Ekofluid at none against CalcKing Pro's 1. CalcKing Pro's advantage is update cadence (weekly vs every 6 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. CalcKing Pro sells 1 one-off in-app purchase. Ekofluid asks for nothing beyond the download.

Ekofluid ships an update every 6 months, CalcKing Pro weekly. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Ekofluid | CalcKing Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Weekly** |
| Size | 19 MB | 2 MB |
| Requires iOS | **14.0.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ekofluid GmbH](https://appshunter.io/developer/1735729921) | [文娟 唐](https://appshunter.io/developer/1870722016) |

## What reviewers say

### Ekofluid

[App page](https://appshunter.io/ios/app/ekofluid/id6479363413)

**Features:** macOS Compatibility

**In-app purchases:** none


### CalcKing Pro

[App page](https://appshunter.io/ios/app/calcking-pro-professional/id6758431895)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 解锁功能 | $3.99 | one-time |


## Frequently asked questions

### Is Ekofluid free?

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

### Is CalcKing Pro free?

CalcKing Pro is free to download, with in-app purchases available.

### Do Ekofluid or CalcKing Pro have ads?

Neither Ekofluid nor CalcKing Pro shows ads.

### Which is updated more often, Ekofluid or CalcKing Pro?

Ekofluid ships an update every 6 months, and CalcKing Pro weekly. Most recently, Ekofluid was updated on October 30, 2026 and CalcKing Pro on October 25, 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.*