# Marine Docker vs Flexcon Water Tank Sizing App

The clearest difference is update cadence: Flexcon Water Tank Sizing App at daily against Marine Docker's every 4 months. Marine Docker's advantage is iOS requirement (13.4 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Marine Docker ships an update every 4 months, Flexcon Water Tank Sizing App daily. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Marine Docker | Flexcon Water Tank Sizing App |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Daily** |
| Size | 61 MB | 9 MB |
| Requires iOS | **13.4** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kontis d.o.o.](https://appshunter.io/developer/1745258669) | [Flexcon Industries](https://appshunter.io/developer/1801895162) |

## What reviewers say

### Marine Docker

[App page](https://appshunter.io/ios/app/marine-docker/id6502378616)

**Features:** macOS Compatibility

**In-app purchases:** none


### Flexcon Water Tank Sizing App

[App page](https://appshunter.io/ios/app/flexcon-water-tank-sizing-app/id6743196195)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Marine Docker free?

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

### Is Flexcon Water Tank Sizing App free?

Flexcon Water Tank Sizing App is free to download, with no in-app purchases.

### Do Marine Docker or Flexcon Water Tank Sizing App have ads?

Neither Marine Docker nor Flexcon Water Tank Sizing App shows ads.

### Which is updated more often, Marine Docker or Flexcon Water Tank Sizing App?

Marine Docker ships an update every 4 months, and Flexcon Water Tank Sizing App daily. Most recently, Marine Docker was updated on October 27, 2026 and Flexcon Water Tank Sizing App 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.*