# Deflection Lite vs 结构大师HD

The clearest difference is rating: Deflection Lite at 4.5 against 结构大师HD's 2.0. Deflection Lite also leads on in-app purchases (none vs 4) and ratings volume (46 vs 1). 结构大师HD's advantage is iOS requirement (9.0 vs 15.0). On price, update cadence and ads there is nothing between them.

Both are free to download. 结构大师HD sells 4 one-off in-app purchases. Deflection Lite asks for nothing beyond the download.

Deflection Lite holds the better App Store score, 4.5 against 2.0. That said, the two scores are not equally well evidenced: Deflection Lite has 46 ratings behind it against 1, so its average is the more settled of the two.

Deflection Lite ships an update every 3 months, 结构大师HD every 2 months. The most recent releases landed on October 4, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Deflection Lite | 结构大师HD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (46 ratings)](https://appshunter.io/ios/app/deflection-lite/id974474071/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/hd/id1059035629/reviews) |
| Number of ratings | **46** | 1 |
| Positive reviews | 44.4% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 108 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 Lite

[App page](https://appshunter.io/ios/app/deflection-lite/id974474071)

This app provides interactive and precise structural beam analysis. Easily visualize beam bending by dragging loads and supports, and calculate key engineering results like reactions, shear force, and bending moment.

**Highlights:** Interactive beam bending visualization, Calculate reactions, shear force, and bending moment, Built-in cross-section databases, Unlimited loads and supports, Export design to shareable permalink, Metric and standard units

**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 Lite free?

Deflection Lite is free to download, 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 Lite or 结构大师HD?

Deflection Lite is rated higher. Deflection Lite averages 4.5 out of 5 from 46 ratings, while 结构大师HD averages 2.0 from 1 ratings.

### Do Deflection Lite or 结构大师HD have ads?

Neither Deflection Lite nor 结构大师HD shows ads.

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

Deflection Lite ships an update every 3 months, and 结构大师HD every 2 months. Most recently, Deflection Lite was updated on October 4, 2026 and 结构大师HD on October 6, 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.*