# 材料力学 vs Triangle3

The clearest difference is price: 材料力学 at Free against Triangle3's $3.99. Triangle3's advantage is ads (none vs shown). On update cadence, in-app purchases, device support and iOS requirement there is nothing between them.

材料力学 is free to download; Triangle3 costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

材料力学 ships an update every 2 months, Triangle3 every 5 weeks. The most recent releases landed on June 10, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | 材料力学 | Triangle3 |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Positive reviews | — | 40.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | — | Paid |
| Size | 8 MB | 7 MB |
| Requires iOS | 15.5 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Risako Asai](https://appshunter.io/developer/1671273580) | [ryo sasaki](https://appshunter.io/developer/318552526) |

## What reviewers say

### 材料力学

[App page](https://appshunter.io/ios/app/id1643386130)

**Features:** macOS Compatibility

**In-app purchases:** none


### Triangle3

[App page](https://appshunter.io/ios/app/triangle3/id1643788233)

This app provides advanced calculation tools for field work, specializing in right and unequal triangles. It supports complex shapes like cones, pipes, and screw wings, with AR visualization for floor plans. It also includes standard calculator functions and memory features.

**Highlights:** Right and unequal triangle calculations, Complex shape development (cones, pipes, etc.), Augmented Reality (AR) floor plan visualization, Standard calculator functions with memory, Trigonometric and cosine theorem calculations, PCD and screw wing calculations

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 材料力学 free?

材料力学 is free to download, with no in-app purchases.

### Is Triangle3 free?

Triangle3 costs $3.99, with no in-app purchases.

### Do 材料力学 or Triangle3 have ads?

材料力学 shows ads; Triangle3 does not.

### Which is updated more often, 材料力学 or Triangle3?

材料力学 ships an update every 2 months, and Triangle3 every 5 weeks. Most recently, 材料力学 was updated on June 10, 2026 and Triangle3 on September 13, 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.*