# FEATUREgrip vs Pipe Diameter Calculators

The clearest difference is in-app purchases: FEATUREgrip at none against Pipe Diameter Calculators's 1. 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. FEATUREgrip asks for nothing beyond the download.

FEATUREgrip ships an update every 23 months, Pipe Diameter Calculators every 20 months. The most recent releases landed on October 27, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | FEATUREgrip | Pipe Diameter Calculators |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 20 months** |
| Size | 22 MB | 59 MB |
| Requires iOS | **15.1** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Heinrich Kipp Werk KG](https://appshunter.io/developer/639520721) | [Ashvin Kevadiya](https://appshunter.io/developer/1756324971) |

## What reviewers say

### FEATUREgrip

[App page](https://appshunter.io/ios/app/featuregrip/id6477911999)

**Features:** macOS Compatibility

**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 FEATUREgrip free?

FEATUREgrip 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 FEATUREgrip or Pipe Diameter Calculators have ads?

Neither FEATUREgrip nor Pipe Diameter Calculators shows ads.

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

FEATUREgrip ships an update every 23 months, and Pipe Diameter Calculators every 20 months. Most recently, FEATUREgrip was updated on October 27, 2026 and Pipe Diameter Calculators on October 29, 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.*