Triangle Calc A vs IsoTool
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Triangle Calc A
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The fastest way to solve Right Triangles. Triangle Calc A is a minimalist and specialized tool for anyone who needs instant, accurate right triangle calculations. Designed for speed and precision, it eliminates complex menus so you can focus on your work. Key Features: ■ Specialized for Right Triangles: Just enter two known values to solve the rest: ・Two sides (Pythagorean theorem) ・One side and one angle (Trigonometry) ■ Instant Results: Get all sides, angles, Area, and Perimeter immediately. ■ Minimalist Interface: No distractions. Open the app, enter your numbers, and get the answer in seconds. ■ Professional Precision: High-accuracy calculations for engineering, construction, and education. Perfect for: ■ Construction & Carpentry: Calculating pitches, slopes, and framing layouts. ■ Engineering: Quick geometric verification on-site. ■ Education: A reliable companion for trigonometry homework.
IsoTool
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IsoTool includes a 7-day free trial for first-time users. Continued use requires a paid subscription. IsoTool is a tool for precise calculation of pipe and sheet-metal flat patterns for technical insulation, ventilation, and metal fabrication. Calculate flat patterns for pipes, bends, T-pieces, and transition pieces in seconds. The calculator generates an accurate pattern with all dimensions, ready to be transferred directly onto sheet metal or used as a digital reference. IsoTool is developed for professionals in technical insulation, ventilation, and sheet-metal work who need fast and accurate calculations without using complex CAD software. Features: • Calculates flat patterns for pipes, such as: bends, T-pieces, and transitions • Displays dimensions and angles in a clear, easy-to-read layout • Ideal for workshop, job site, or educational use With IsoTool, you get a practical and reliable tool that saves time, reduces errors, and ensures accurate results—every time. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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Verdict
The clearest difference is price: IsoTool at Free against Triangle Calc A's $0.99. Triangle Calc A's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement 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
IsoTool is free to download; Triangle Calc A costs $0.99 up front. IsoTool sells 1 in-app purchase, starting at $4.99 per month. Triangle Calc A asks for nothing beyond the download.
| Parameter | Triangle Calc A | IsoTool |
|---|---|---|
| Price | $0.99 | Free — better |
| Update frequency | Every 56 months | — |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.0 | 26.0 |
| Further details — not scored | ||
| Size | 0 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | kohei yamane | Kim Mathiesen |
In-app purchases
Triangle Calc A
No in-app purchases
IsoTool
- Monthly subscription7 Days trial$4.991 Month









