# PJFFfree vs Stinger

The clearest difference is in-app purchases: PJFFfree at none against Stinger's 1. PJFFfree also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). Stinger's advantage is ads (none vs shown). On price and update cadence there is nothing between them.

Both are free to download. Stinger sells 1 one-off in-app purchase. PJFFfree asks for nothing beyond the download.

PJFFfree ships an update every 5 weeks, Stinger every 4 weeks. The most recent releases landed on October 8, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | PJFFfree | Stinger |
| --- | --- | --- |
| 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** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Every 4 weeks** |
| Monetization | Ad-supported | — |
| Size | 7 MB | 1 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [sigeyosi kanenishi](https://appshunter.io/developer/629958778) | [Faruk Orman](https://appshunter.io/developer/1754575068) |

## 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


### Stinger

[App page](https://appshunter.io/ios/app/stinger-weld-settings-calc/id6800430478)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stinger Pro | $9.99 | one-time |


## Frequently asked questions

### Is PJFFfree free?

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

### Is Stinger free?

Stinger is free to download, with in-app purchases available.

### Do PJFFfree or Stinger have ads?

PJFFfree shows ads; Stinger does not.

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

PJFFfree ships an update every 5 weeks, and Stinger every 4 weeks. Most recently, PJFFfree was updated on October 8, 2026 and Stinger on October 25, 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.*