# 唱唱乐学堂 vs Knowe Astro：Birth Chart

The clearest difference is iOS requirement: 唱唱乐学堂 at 9.0 against Knowe Astro：Birth Chart's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. 唱唱乐学堂 sells 1 one-off in-app purchase and Knowe Astro：Birth Chart sells 4 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

唱唱乐学堂 ships an update every 8 days, Knowe Astro：Birth Chart every 4 days. The most recent releases landed on October 25, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | 唱唱乐学堂 | Knowe Astro：Birth Chart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/knowe-astrobirth-chart/id6752608152/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 8 days | **Every 4 days** |
| Monetization | — | Freemium |
| Size | 189 MB | 22 MB |
| Requires iOS | **9.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Shanghai Changqi Technology Co., Ltd](https://appshunter.io/developer/1503459776) | [占辉 百](https://appshunter.io/developer/1081455103) |

## What reviewers say

### 唱唱乐学堂

[App page](https://appshunter.io/ios/app/id1512534906)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 唱唱家庭启蒙会员卡 | $149.99 | one-time |


### Knowe Astro：Birth Chart

[App page](https://appshunter.io/ios/app/knowe-astrobirth-chart/id6752608152)

This app generates detailed natal charts, synastry comparisons, and transit readings. It offers AI-powered interpretations and includes a built-in astrology library for in-depth study. Ideal for both beginners and experienced astrologers seeking a clear workspace.

**Highlights:** Accurate natal and birth charts, Synastry and compatibility analysis, Transit tracking and timing, AI chart interpretation, In-app astrology library, Detailed placement study

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Pro Membership | $4.99 | per month |
| Monthly Ultra Membership | $6.99 | per month |
| Yearly Pro Membership | $19.99 | per year |
| Yearly Ultra Membership | $29.99 | per year |


## Frequently asked questions

### Is 唱唱乐学堂 free?

唱唱乐学堂 is free to download, with in-app purchases available.

### Is Knowe Astro：Birth Chart free?

Knowe Astro：Birth Chart is free to download, with in-app purchases available.

### Do 唱唱乐学堂 or Knowe Astro：Birth Chart have ads?

Neither 唱唱乐学堂 nor Knowe Astro：Birth Chart shows ads.

### Which is updated more often, 唱唱乐学堂 or Knowe Astro：Birth Chart?

唱唱乐学堂 ships an update every 8 days, and Knowe Astro：Birth Chart every 4 days. Most recently, 唱唱乐学堂 was updated on October 25, 2026 and Knowe Astro：Birth Chart on October 15, 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.*