# Flowster vs Pipe Diameter Calculators

The clearest difference is in-app purchases: Flowster at none against Pipe Diameter Calculators's 1. Pipe Diameter Calculators's advantage is iOS requirement (15.6 vs 26.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Pipe Diameter Calculators sells 1 one-off in-app purchase. Flowster asks for nothing beyond the download.

Flowster ships an update every 23 months, Pipe Diameter Calculators every 20 months. Both last shipped on November 8, 2026.

## The numbers

| Metric | Flowster | Pipe Diameter Calculators |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 20 months** |
| Size | 1 MB | 59 MB |
| Requires iOS | 26.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ATCREATE INC.](https://appshunter.io/developer/1623520671) | [Ashvin Kevadiya](https://appshunter.io/developer/1756324971) |

## What reviewers say

### Flowster

[App page](https://appshunter.io/ios/app/flowster/id6476015416)

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

**In-app purchases:** none


### Pipe Diameter Calculators

[App page](https://appshunter.io/ios/app/pipe-diameter-calculators/id6743020859)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is Flowster free?

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

### Is Pipe Diameter Calculators free?

Pipe Diameter Calculators is free to download, with in-app purchases available.

### Do Flowster or Pipe Diameter Calculators have ads?

Neither Flowster nor Pipe Diameter Calculators shows ads.

### Which is updated more often, Flowster or Pipe Diameter Calculators?

Flowster ships an update every 23 months, and Pipe Diameter Calculators every 20 months. Most recently, Flowster was updated on November 8, 2026 and Pipe Diameter Calculators on November 8, 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.*