# Knowe Astro：Birth Chart vs Celestium

The clearest difference is ratings volume: Celestium at 4 against Knowe Astro：Birth Chart's 1. On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Knowe Astro：Birth Chart sells 4 in-app purchases, starting at $4.99 per month and Celestium sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Knowe Astro：Birth Chart against 5.0 for Celestium. Both are backed by a comparable volume of ratings — 1 and 4 respectively.

Both ship on a similar rhythm, roughly every 4 days. The most recent releases landed on September 29, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Knowe Astro：Birth Chart | Celestium |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/knowe-astrobirth-chart/id6752608152/reviews) | [5.0 (4 ratings)](https://appshunter.io/ios/app/celestium-cosmic-compass/id6761672904/reviews) |
| Number of ratings | 1 | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | Every 4 days |
| Monetization | Freemium | Freemium |
| Size | 22 MB | 117 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [占辉 百](https://appshunter.io/developer/1081455103) | [Jhinna Salinas](https://appshunter.io/developer/1850224128) |

## What reviewers say

### 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 |


### Celestium

[App page](https://appshunter.io/ios/app/celestium-cosmic-compass/id6761672904)

Explore personalized astrological insights for life's decisions. Discover ideal locations for love, work, and growth, and understand daily cosmic weather. Engage in guided rituals and connect with others through shared astrological charts.

**Highlights:** Location scoring for love, work, vitality, and growth, Daily cosmic weather and moon phase tracking, Guided rituals for moon phases, Couples and group chart analysis, On-device chart computation with no tracking, AI interpretations via user's Anthropic API key

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $6.99 | per month |
| Premium Yearly | $42.99 | per year |


## Frequently asked questions

### Is Knowe Astro：Birth Chart free?

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

### Is Celestium free?

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

### Which has better reviews, Knowe Astro：Birth Chart or Celestium?

Knowe Astro：Birth Chart and Celestium are both rated 5.0 out of 5 on the App Store, from 1 and 4 ratings respectively.

### Do Knowe Astro：Birth Chart or Celestium have ads?

Neither Knowe Astro：Birth Chart nor Celestium shows ads.

### Which is updated more often, Knowe Astro：Birth Chart or Celestium?

Knowe Astro：Birth Chart ships an update every 4 days, and Celestium every 4 days. Most recently, Knowe Astro：Birth Chart was updated on September 29, 2026 and Celestium on October 6, 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.*