# 21天突破高频词汇 vs PhysicsBench

The clearest difference is price: PhysicsBench at Free against 21天突破高频词汇's $0.99. PhysicsBench also leads on update cadence (every 2 days vs every 3 weeks). 21天突破高频词汇's advantage is in-app purchases (none vs 4). On ads, device support and iOS requirement there is nothing between them.

PhysicsBench is free to download; 21天突破高频词汇 costs $0.99 up front. PhysicsBench sells 4 one-off in-app purchases. 21天突破高频词汇 asks for nothing beyond the download.

21天突破高频词汇 ships an update every 3 weeks, PhysicsBench every 2 days. The most recent releases landed on October 8, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | 21天突破高频词汇 | PhysicsBench |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/physicsbench-circuit-puzzle/id6813391010/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | — | Free with in-app purchases |
| Size | 3 MB | 10 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [鲁扬 王](https://appshunter.io/developer/1890054449) | [献慧 陈](https://appshunter.io/developer/1896370005) |

## What reviewers say

### 21天突破高频词汇

[App page](https://appshunter.io/ios/app/21/id6797169848)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### PhysicsBench

[App page](https://appshunter.io/ios/app/physicsbench-circuit-puzzle/id6813391010)

Engage with realistic physics simulations, from electrical circuits to light optics and mechanics. Solve puzzles, understand the underlying formulas with Principle Cards, and track your progress through various subjects and difficulties. Offers offline play and a robust Pro version for advanced features.

**Highlights:** Realistic physics simulations, Principle Cards with formulas, 108 levels across 7 subjects, Daily experiments and streaks, Offline play, Level editor, Pro version with advanced features

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Intro Answers | $0.99 | one-time |
| Core Answers | $1.99 | one-time |
| Brainer Answers | $2.99 | one-time |
| Pro Lifetime | $4.99 | one-time |


## Frequently asked questions

### Is 21天突破高频词汇 free?

21天突破高频词汇 costs $0.99, with no in-app purchases.

### Is PhysicsBench free?

PhysicsBench is free to download, with in-app purchases available.

### Do 21天突破高频词汇 or PhysicsBench have ads?

Neither 21天突破高频词汇 nor PhysicsBench shows ads.

### Which is updated more often, 21天突破高频词汇 or PhysicsBench?

21天突破高频词汇 ships an update every 3 weeks, and PhysicsBench every 2 days. Most recently, 21天突破高频词汇 was updated on October 8, 2026 and PhysicsBench on October 12, 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.*