# 易经导航 HD vs Physics Formulas

The clearest difference is review sentiment: Physics Formulas at 50% against 易经导航 HD's 0%. Physics Formulas also leads on price ($0.99 vs $4.99) and update cadence (every 4 months vs every 11 months). 易经导航 HD's advantage is iOS requirement (10.0 vs 13.4). On ads, in-app purchases, monetization model and device support there is nothing between them.

易经导航 HD costs $4.99 and Physics Formulas $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

易经导航 HD ships an update every 11 months, Physics Formulas every 4 months. The most recent releases landed on September 7, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | 易经导航 HD | Physics Formulas |
| --- | --- | --- |
| Price | $4.99 | **$0.99** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/physics-formulas/id814898894/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 4 months** |
| Monetization | Paid | Paid |
| Size | 9 MB | 28 MB |
| Requires iOS | **10.0** | 13.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | +4 |
| Developer | [Lingchen](https://appshunter.io/developer/490063568) | [NSC CO. PTY LTD](https://appshunter.io/developer/579522076) |

## What reviewers say

### 易经导航 HD

[App page](https://appshunter.io/ios/app/hd/id534524272)

Learn the I Ching with guided lessons and practice exercises. This app helps you understand卦象, 卦辞, and 爻辞 to broaden your perspective and increase wisdom. It also offers divination features to aid in rational decision-making and navigating life's challenges.

**Highlights:** Learn I Ching principles, Practice卦象, 卦辞, 爻辞, Expand perspective and wisdom, I Ching divination for guidance, Rational decision-making aid, Includes 焦氏易林

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

**In-app purchases:** none


### Physics Formulas

[App page](https://appshunter.io/ios/app/physics-formulas/id814898894)

Access a comprehensive collection of physics formulas categorized for easy study and work. Features include calculation tools, multi-language support, and the ability to save and share formulas.

**Highlights:** Formula reference by category, In-app calculation tools, Support for 15 languages, Favorite formulas folder, Formula sharing functionality, Searchable formula database, Add custom formulas and notes

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

**In-app purchases:** none


## Frequently asked questions

### Is 易经导航 HD free?

易经导航 HD costs $4.99, with no in-app purchases.

### Is Physics Formulas free?

Physics Formulas costs $0.99, with no in-app purchases.

### Do 易经导航 HD or Physics Formulas have ads?

Neither 易经导航 HD nor Physics Formulas shows ads.

### Which is updated more often, 易经导航 HD or Physics Formulas?

易经导航 HD ships an update every 11 months, and Physics Formulas every 4 months. Most recently, 易经导航 HD was updated on September 7, 2026 and Physics Formulas 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.*