# KRAH Pipe Calculation vs WeldZip

The clearest difference is update cadence: KRAH Pipe Calculation at every 2 months against WeldZip's every 8 months. 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.

KRAH Pipe Calculation ships an update every 2 months, WeldZip every 8 months. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | KRAH Pipe Calculation | WeldZip |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 8 months |
| Size | 74 MB | 85 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Krah GmbH](https://appshunter.io/developer/1379033149) | [Shanghai KongDe IT Co., LTD.](https://appshunter.io/developer/1235370082) |

## What reviewers say

### KRAH Pipe Calculation

[App page](https://appshunter.io/ios/app/krah-pipe-calculation/id1379033150)

**Features:** macOS Compatibility

**In-app purchases:** none


### WeldZip

[App page](https://appshunter.io/ios/app/weldzip/id6739935720)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is KRAH Pipe Calculation free?

KRAH Pipe Calculation is free to download, with no in-app purchases.

### Is WeldZip free?

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

### Do KRAH Pipe Calculation or WeldZip have ads?

Neither KRAH Pipe Calculation nor WeldZip shows ads.

### Which is updated more often, KRAH Pipe Calculation or WeldZip?

KRAH Pipe Calculation ships an update every 2 months, and WeldZip every 8 months. Most recently, KRAH Pipe Calculation was updated on November 2, 2026 and WeldZip on October 30, 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.*