# PJFFfree vs 4M Plan

The clearest difference is ads: 4M Plan at none against PJFFfree's shown. 4M Plan also leads on update cadence (every 9 days vs every 5 weeks). PJFFfree's advantage is iOS requirement (15.0 vs 17.0). On price, 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.

PJFFfree ships an update every 5 weeks, 4M Plan every 9 days. The most recent releases landed on September 22, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | PJFFfree | 4M Plan |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pjfffree/id629958775/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Every 9 days** |
| Monetization | Ad-supported | — |
| Size | 7 MB | 96 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [sigeyosi kanenishi](https://appshunter.io/developer/629958778) | [Cutech Infocomm Solutions Ptd Ltd](https://appshunter.io/developer/1748529578) |

## What reviewers say

### PJFFfree

[App page](https://appshunter.io/ios/app/pjfffree/id629958775)

This app serves as a manual for piping parts, focusing on Japanese specifications. It lists commonly used items based on manufacturer data and public dimension tables, with all measurements in millimeters.

**Highlights:** Piping parts manual, Japanese specifications, Commonly used parts listing, Manufacturer data integration, Millimeter measurements, JIS standards compliance

**Features:** macOS Compatibility

**In-app purchases:** none


### 4M Plan

[App page](https://appshunter.io/ios/app/4m-plan/id6755679525)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PJFFfree free?

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

### Is 4M Plan free?

4M Plan is free to download, with no in-app purchases.

### Do PJFFfree or 4M Plan have ads?

PJFFfree shows ads; 4M Plan does not.

### Which is updated more often, PJFFfree or 4M Plan?

PJFFfree ships an update every 5 weeks, and 4M Plan every 9 days. Most recently, PJFFfree was updated on September 22, 2026 and 4M Plan on September 15, 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.*