# Deflection vs 结构大师HD

The clearest difference is price: 结构大师HD at Free against Deflection's $4.99. 结构大师HD also leads on iOS requirement (9.0 vs 15.0). Deflection's advantage is rating (4.6 vs 2.0) and in-app purchases (none vs 4). On update cadence and ads there is nothing between them.

结构大师HD is free to download; Deflection costs $4.99 up front. 结构大师HD sells 4 one-off in-app purchases. Deflection asks for nothing beyond the download.

Deflection holds the better App Store score, 4.6 against 2.0. That said, the two scores are not equally well evidenced: Deflection has 115 ratings behind it against 1, so its average is the more settled of the two.

Deflection ships an update every 6 weeks, 结构大师HD every 2 months. Both last shipped on November 13, 2026.

## The numbers

| Metric | Deflection | 结构大师HD |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[4.6 (115 ratings)](https://appshunter.io/ios/app/deflection/id670400597/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/hd/id1059035629/reviews) |
| Number of ratings | **115** | 1 |
| Positive reviews | 73.6% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 160 MB | 102 MB |
| Requires iOS | 15.0 | **9.0** |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Blue Ketchep](https://appshunter.io/developer/1131834248) | [颖达 陈](https://appshunter.io/developer/1058507663) |

## What reviewers say

### Deflection

[App page](https://appshunter.io/ios/app/deflection/id670400597)

Calculate structural behavior for beams, 2D trusses, and 2D frames. Visualize reaction forces, shear, bending moment, and deflection. Analyze internal stresses along the beam and cross-section.

**Highlights:** Beam, 2D truss, and 2D frame analysis, Graphical output of results, Internal shear and bending stress calculation, 2D frame and truss editor, Cross-section editor with automatic calculations, Built-in database and quick-start templates

**Features:** Vision Pro support

**In-app purchases:** none


### 结构大师HD

[App page](https://appshunter.io/ios/app/hd/id1059035629)

This app provides structural analysis and mechanics calculations for structural engineers and field engineers on tablets. It offers advanced features like internal force diagrams, dynamics, influence lines, and AI-powered step-by-step solutions for various methods. The VIP version unlocks additional engineering modules, customization options, and reporting capabilities.

**Highlights:** Convenient modeling with touch input, Internal force diagrams and dynamics, AI-powered step-by-step solutions, Support for structural design and large structures, VIP features: engineering modules, custom sections, dark theme, Cross-platform compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 打赏 | $1.99 | one-time |
| 高级功能购买 | $3.99 | one-time |
| 解锁当前版本SMHD | $19.99 | one-time |
| 解锁全版本 | $24.99 | one-time |


## Frequently asked questions

### Is Deflection free?

Deflection costs $4.99, with no in-app purchases.

### Is 结构大师HD free?

结构大师HD is free to download, with in-app purchases available.

### Which has better reviews, Deflection or 结构大师HD?

Deflection is rated higher. Deflection averages 4.6 out of 5 from 115 ratings, while 结构大师HD averages 2.0 from 1 ratings.

### Do Deflection or 结构大师HD have ads?

Neither Deflection nor 结构大师HD shows ads.

### Which is updated more often, Deflection or 结构大师HD?

Deflection ships an update every 6 weeks, and 结构大师HD every 2 months. Most recently, Deflection was updated on November 13, 2026 and 结构大师HD on November 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.*