# Celestron SkyPortal vs 星座早見 / Planisphere

The clearest difference is rating: Celestron SkyPortal at 3.6 against 星座早見 / Planisphere's 1.0. Celestron SkyPortal also leads on review sentiment (32% vs 0%) and ratings volume (354 vs 1). 星座早見 / Planisphere's advantage is update cadence (every 5 weeks vs every 3 months) and iOS requirement (15.0 vs 18.6). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Celestron SkyPortal holds the better App Store score, 3.6 against 1.0. That said, the two scores are not equally well evidenced: Celestron SkyPortal has 354 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 32% of Celestron SkyPortal's written reviews are positive against 0% of 星座早見 / Planisphere's.

Celestron SkyPortal ships an update every 3 months, 星座早見 / Planisphere every 5 weeks. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Celestron SkyPortal | 星座早見 / Planisphere |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.6 (354 ratings)](https://appshunter.io/ios/app/celestron-skyportal/id877780544/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/planisphere/id882653086/reviews) |
| Number of ratings | **354** | 1 |
| Positive reviews | **31.9% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 709 MB | 277 MB |
| Requires iOS | 18.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Celestron, LLC](https://appshunter.io/developer/445142854) | [IMAGE FACTORY CO., LTD.](https://appshunter.io/developer/882653089) |

## What reviewers say

### Celestron SkyPortal

[App page](https://appshunter.io/ios/app/celestron-skyportal/id877780544)

Explore the cosmos with a comprehensive astronomy suite. Discover stars, planets, and celestial events, and enhance your stargazing with detailed information and audio narration. Connect to compatible telescopes for automatic object location.

**Highlights:** Explore 120,000 stars and celestial objects, Simulate night sky past/future, Real-time sky synchronization, Control compatible WiFi telescopes, Animate celestial events, Audio narration and object descriptions, Night Vision mode

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

**In-app purchases:** none

**What reviewers like**

- 👍 Great app
- 🚀 Transforms stargazing
- 💡 Wonderful features
- 👍 Convenient control
- 👍 Incredible for free

**What reviewers complain about**

- 🐛 Alignment issues
- 🐛 Connectivity problems
- 🐛 Laggy controls
- 🐛 Inaccurate compass
- 🐛 Crashes and freezes

**Reported bugs**

- Fails to align telescope
- Telescope points in wrong direction
- Disconnects frequently
- Doesn't show deep sky objects
- Crashes on startup

**Requested features**

- Add red night mode
- Improve focus motor control
- Integrate weather data
- Provide RA/DEC coordinates
- Add more celestial objects


### 星座早見 / Planisphere

[App page](https://appshunter.io/ios/app/planisphere/id882653086)

This app simulates the night sky, displaying stars, planets, and the moon. It functions like a traditional planisphere but with added digital features, allowing users to easily view celestial positions and predict sunrise/sunset times.

**Highlights:** Real-time sky display, Planet and moon tracking, Interactive sky map, Sunrise/sunset prediction, Zoomable interface, Dark-friendly screen

**In-app purchases:** none


## Frequently asked questions

### Is Celestron SkyPortal free?

Celestron SkyPortal is free to download, with no in-app purchases.

### Is 星座早見 / Planisphere free?

星座早見 / Planisphere is free to download, with no in-app purchases.

### Which has better reviews, Celestron SkyPortal or 星座早見 / Planisphere?

Celestron SkyPortal is rated higher. Celestron SkyPortal averages 3.6 out of 5 from 354 ratings, while 星座早見 / Planisphere averages 1.0 from 1 ratings.

### Do Celestron SkyPortal or 星座早見 / Planisphere have ads?

Neither Celestron SkyPortal nor 星座早見 / Planisphere shows ads.

### Which is updated more often, Celestron SkyPortal or 星座早見 / Planisphere?

Celestron SkyPortal ships an update every 3 months, and 星座早見 / Planisphere every 5 weeks. Most recently, Celestron SkyPortal was updated on November 1, 2026 and 星座早見 / Planisphere on November 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.*