# PJFFfree vs TriangleS

The clearest difference is price: PJFFfree at Free against TriangleS's $0.99. PJFFfree also leads on update cadence (every 5 weeks vs every 4 months). TriangleS's advantage is ads (none vs shown) and iOS requirement (13.0 vs 15.0). On in-app purchases and device support there is nothing between them.

PJFFfree is free to download; TriangleS costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PJFFfree ships an update every 5 weeks, TriangleS every 4 months. The most recent releases landed on September 22, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | PJFFfree | TriangleS |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| 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 4 months |
| Monetization | Ad-supported | — |
| Size | 7 MB | 2 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [sigeyosi kanenishi](https://appshunter.io/developer/629958778) | [ryo sasaki](https://appshunter.io/developer/318552526) |

## 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


### TriangleS

[App page](https://appshunter.io/ios/app/triangles/id1572386611)

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

**In-app purchases:** none


## Frequently asked questions

### Is PJFFfree free?

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

### Is TriangleS free?

TriangleS costs $0.99, with no in-app purchases.

### Do PJFFfree or TriangleS have ads?

PJFFfree shows ads; TriangleS does not.

### Which is updated more often, PJFFfree or TriangleS?

PJFFfree ships an update every 5 weeks, and TriangleS every 4 months. Most recently, PJFFfree was updated on September 22, 2026 and TriangleS on September 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.*