# Flexcon Water Tank Sizing App vs ProPump Calc

The clearest difference is in-app purchases: Flexcon Water Tank Sizing App at none against ProPump Calc's 2. Flexcon Water Tank Sizing App also leads on update cadence (daily vs every 3 weeks). ProPump Calc's advantage is iOS requirement (13.0 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. ProPump Calc sells 2 in-app purchases, starting at $8.99 per month. Flexcon Water Tank Sizing App asks for nothing beyond the download.

Flexcon Water Tank Sizing App ships an update daily, ProPump Calc every 3 weeks. The most recent releases landed on October 25, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Flexcon Water Tank Sizing App | ProPump Calc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Every 3 weeks |
| Size | 9 MB | 54 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Flexcon Industries](https://appshunter.io/developer/1801895162) | [Brandon Wright](https://appshunter.io/developer/1828458254) |

## What reviewers say

### 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


### ProPump Calc

[App page](https://appshunter.io/ios/app/propump-calc-qf/id6759294021)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ProPump Monthly Subscription | $8.99 | per month |
| ProPump Yearly Subscription | $89.99 | per year |


## Frequently asked questions

### Is Flexcon Water Tank Sizing App free?

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

### Is ProPump Calc free?

ProPump Calc is free to download, with in-app purchases available.

### Do Flexcon Water Tank Sizing App or ProPump Calc have ads?

Neither Flexcon Water Tank Sizing App nor ProPump Calc shows ads.

### Which is updated more often, Flexcon Water Tank Sizing App or ProPump Calc?

Flexcon Water Tank Sizing App ships an update daily, and ProPump Calc every 3 weeks. Most recently, Flexcon Water Tank Sizing App was updated on October 25, 2026 and ProPump Calc on October 12, 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.*