# 三七笔记 vs 天运八字

三七笔记 and 天运八字 are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. 三七笔记 sells 9 one-off in-app purchases and 天运八字 sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

三七笔记 ships an update every 10 days, 天运八字 fortnightly. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | 三七笔记 | 天运八字 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Fortnightly |
| Monetization | — | Free with in-app purchases |
| Size | 118 MB | 40 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [海龙 陈](https://appshunter.io/developer/1819508990) | [厦门星际港湾电商有限公司](https://appshunter.io/developer/1854750209) |

## What reviewers say

### 三七笔记

[App page](https://appshunter.io/ios/app/id6747325065)

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 一月AI会员 | $3.99 | one-time |
| 一年排盘会员 | $12.99 | one-time |
| 一年AI会员 | $12.99 | one-time |
| 一年综合会员 | $19.99 | one-time |
| 两年排盘会员 | $24.99 | one-time |
| 三年AI会员 | $29.99 | one-time |
| 两年综合会员 | $29.99 | one-time |
| 五年排盘会员 | $39.99 | one-time |
| 三年综合会员 | $39.99 | one-time |


### 天运八字

[App page](https://appshunter.io/ios/app/ai/id6764254024)

Manage birthdays and important dates with smart reminders. Offers professional Bazi readings, elemental analysis, and name suggestions based on birth data. Ideal for those who want to remember special occasions and explore traditional Chinese astrology.

**Highlights:** Birthday archive management, Smart countdown reminders, Professional Bazi chart analysis, Five elements and destiny inquiry, Auspicious day selection, Name suggestion reference, Customizable reminder rules

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 按月订阅会员 | $3.99 | per month |
| 按年订阅会员 | $9.99 | per year |


## Frequently asked questions

### Is 三七笔记 free?

三七笔记 is free to download, with in-app purchases available.

### Is 天运八字 free?

天运八字 is free to download, with in-app purchases available.

### Do 三七笔记 or 天运八字 have ads?

Neither 三七笔记 nor 天运八字 shows ads.

### Which is updated more often, 三七笔记 or 天运八字?

三七笔记 ships an update every 10 days, and 天运八字 fortnightly. Most recently, 三七笔记 was updated on October 30, 2026 and 天运八字 on October 28, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*