# 公式大师Pro vs 写信小助手

The clearest difference is in-app purchases: 写信小助手 at none against 公式大师Pro's 4. 写信小助手 also leads on update cadence (every 3 days vs every 3 weeks) and iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. 公式大师Pro sells 4 one-off in-app purchases. 写信小助手 asks for nothing beyond the download.

公式大师Pro ships an update every 3 weeks, 写信小助手 every 3 days. The most recent releases landed on October 8, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | 公式大师Pro | 写信小助手 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/pro-a/id1537943079/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 14 MB | 58 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 9+ |
| Developer | [治波 王](https://appshunter.io/developer/1744485157) | [涛 李](https://appshunter.io/developer/1754092577) |

## What reviewers say

### 公式大师Pro

[App page](https://appshunter.io/ios/app/pro-a/id1537943079)

This app helps stock traders find profitable stocks using AI-powered selection formulas and technical analysis tools. It offers a community of traders, a formula store, and tutorials for beginners. It supports custom formula creation and real-time market data.

**Highlights:** AI-powered stock selection, Community of stock traders, Formula store with AI formulas, Custom formula editor with syntax highlighting, Real-time market data, Technical indicators (MACD, KDJ, etc.), Formula tutorials

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 18金币 | $2.99 | one-time |
| 100金币 | $14.99 | one-time |
| 专家VIP | $22.99 | one-time |
| 300金币 | $49.99 | one-time |


### 写信小助手

[App page](https://appshunter.io/ios/app/id6775686522)

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

**In-app purchases:** none


## Frequently asked questions

### Is 公式大师Pro free?

公式大师Pro is free to download, with in-app purchases available.

### Is 写信小助手 free?

写信小助手 is free to download, with no in-app purchases.

### Do 公式大师Pro or 写信小助手 have ads?

Neither 公式大师Pro nor 写信小助手 shows ads.

### Which is updated more often, 公式大师Pro or 写信小助手?

公式大师Pro ships an update every 3 weeks, and 写信小助手 every 3 days. Most recently, 公式大师Pro was updated on October 8, 2026 and 写信小助手 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.*