PJFFfree vs Stinger
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PJFFfree
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.
- Piping parts manual
- Japanese specifications
- Commonly used parts listing
- Manufacturer data integration
- Millimeter measurements
- JIS standards compliance
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It is a manual of piping parts. Only Japanese specification. We are listed at the discretion of the things that seems to be in common use based on manufacturer's data and the dimension tables of dealers that are open to the public. Length units are in millimeters unless otherwise specified in decimal notation JIS standards compliance
Stinger
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WHAT AMPS FOR 1/8 INCH? SOLVED. Pick the process, the metal and the thickness. Stinger answers with real machine settings: amperage, voltage, wire feed speed, gas and polarity, computed from the manufacturers' published charts instead of forum guesses. FREE FOREVER, NO COUNTER - MIG settings for mild steel, stainless and aluminum: amps, volts, wire feed speed, gas flow and transfer mode for every common wire size - Stick amperage for every rod in the catalog: 6010, 6011, 6013, 7014, 7018, 7024, stainless and cast iron nickel, with polarity, positions and the rod's personality - Sheet metal gauge to decimal to millimeters - Tungsten colour codes and current capacity - A defects guide: porosity, undercut, spatter, cracking, with causes and fixes STINGER PRO, ONE PAYMENT - TIG settings for steel, stainless and aluminum: amps, tungsten, cup, gas flow, filler size, and AC balance and frequency for aluminum - Flux core parameters for the self-shielded wires, straight from the wire makers' procedure tables - Heat input in kJ/in and kJ/mm, the number a WPS asks for - Preheat guidance from the carbon equivalent, with steel grade presets - Consumables math: filler weight per fillet, rods per pound, minutes left in the gas bottle - Weld symbols, joint fit-up, shielding gas guide and a which-rod-for-which-job selector - Save your machines and the dialed-in settings that actually worked BUILT FOR THE SHOP FLOOR - Works completely offline, in the yard, under the truck, behind the barn - Imperial and metric everywhere: fractions, gauges and millimeters side by side - Every table names its source. Every result is a starting point, and the app says so - No account, no ads, no tracking, no subscription. Your setups never leave your iPhone Stinger computes starting points from published manufacturer data. It is not a welding procedure specification and does not replace the filler maker's datasheet or your WPS.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | PJFFfree | Stinger |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 5 weeks | Every 4 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 7 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | sigeyosi kanenishi | Faruk Orman |
In-app purchases
PJFFfree
No in-app purchases
Stinger
- Stinger Pro$9.99









