# PMIS vs Pipe Diameter Calculators

The clearest difference is in-app purchases: PMIS at none against Pipe Diameter Calculators's 1. PMIS also leads on update cadence (every 3 months vs every 20 months) and iOS requirement (12.0 vs 15.6). On price, ads and device support there is nothing between them.

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

PMIS ships an update every 3 months, Pipe Diameter Calculators every 20 months. The most recent releases landed on October 30, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | PMIS | Pipe Diameter Calculators |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 20 months |
| Size | 33 MB | 59 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Muhammad Jasim Mohd Mohideen](https://appshunter.io/developer/1731643436) | [Ashvin Kevadiya](https://appshunter.io/developer/1756324971) |

## What reviewers say

### PMIS

[App page](https://appshunter.io/ios/app/pmis/id6478068751)

**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 PMIS free?

PMIS 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 PMIS or Pipe Diameter Calculators have ads?

Neither PMIS nor Pipe Diameter Calculators shows ads.

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

PMIS ships an update every 3 months, and Pipe Diameter Calculators every 20 months. Most recently, PMIS was updated on October 30, 2026 and Pipe Diameter Calculators on November 3, 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.*