PJFFfree vs Trigonometric Calculation
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
Trigonometric Calculation
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This is a calculation application for finding angles and side lengths of triangles. 1 We would appreciate a review if there are any problems such as calculation glitches. 2 I hope you will use this application for simple calculations. Please understand that we cannot be held responsible for any impact or disadvantage related to the quality of production activities caused by the calculations in this application.
Screenshots
Verdict
PJFFfree and Trigonometric Calculation are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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. Neither carries in-app purchases, so what you see is what you pay.
PJFFfree ships an update every 5 weeks, Trigonometric Calculation every 6 weeks. The most recent releases landed on September 22, 2026 and May 16, 2026 respectively.
| Parameter | PJFFfree | Trigonometric Calculation |
|---|---|---|
| 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 — better | Every 6 weeks |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 — better | 15.5 |
| Further details — not scored | ||
| Size | 7 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | sigeyosi kanenishi | Risako Asai |
In-app purchases
PJFFfree
No in-app purchases
Trigonometric Calculation
No in-app purchases
Questions
Is PJFFfree free?
Is Trigonometric Calculation free?
Do PJFFfree or Trigonometric Calculation have ads?
Which is updated more often, PJFFfree or Trigonometric Calculation?
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