Comparison

星座早見 / Planisphere vs 星空ナビ

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

星座早見 / Planisphere

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
Read full description

The planetarium curators of Nagoya City Science Museum have originally designed the Planisphere app. Many people know how to use the planisphere, because we learn it at elementary school. This is the planisphere of the era of IT which added the advantage as an app, with the plain usage of the planisphere printed on paper and plastic. Please look up at the real starry sky with this Planisphere app. The Planisphere app shows the sky of the current time at the start-up. To check the sky at other time, you drag around the date scale with your fingertips to set the date and time. You can use pinch gestures to manipulate a map of the sky. It attends you to enjoy the star watching by glowing in dark place. It is the exceptional planisphere app, because it’s displayed up to the planet positions of the night that is impossible with the printed planisphere! 【Features of the Planisphere application】 ・ Anytime, anywhere: When you look up at the night sky, it stands by in your smartphone or tablet. ・ Very easy usage: The usage of planisphere is exactry same as you learned. Just touch and rotate the board. ・ Quick access : The Planisphere shows the night sky when you start the app. It is easier than a printed planisphere. ・ Prominent planets: The planets always stand out in the night sky. However, the planet positions change day by day, so it is not possible to display on the printed planisphere. The Planisphere app calculates the positions in the night of the 5 planets and the Moon that are seen by the naked eye and displays them as icons on the board. ・ Good at dark places : When we look up at the starry sky, we are of course in a dark place. We needed a torch when using a printed planisphere. But the Planisphere app can be used in the darkness because of the screen light. A tip when using the app is to reduce the screen brightness not to be dazzling. ・ Friendly to any ages: It is difficult to see small letters in a dark place. You can freely zoom in and out with the fingertips on the Planisphere app. Furthermore, it is easier to see than a printed planisphere, since the screen of smart phone or tablet have a light. ・ Sunrise and sunset : You can find the sunrise time by setting a target object to the eastern horizon and the sunset time by setting it to the western horizon on the board. On the Planisphere app, you can find the rough time and direction of sunrise or sunset, because it shows not only stars but also the planets and the Moon. ・ For education : In schools, science museums, planetariums and public astronomical observatories, there are occasions that to explain how to use a planisphere. It is small letters and hard to show to people when explaining the usage. For now, you can connect a smart phone or a tablet to a projector or a big monitor to make the planisphere image larger. There is also a more sophisticated computer version (for Windows and Macintosh) of the Planisphere app. If your school provides tablets to the students, you can use the Planisphere app instead of a printed planisphere. ・ Planetarium of Nagoya City Science Museum opened in 1962. It is the planisphere which contains a lot of curator's experience and know-how. We have made it as an application that we use printed planispheres for the citizen observation party, educational programs, astronomical exhibition room of Nagoya City Science Museum and sell at the museum shop. Bright famous stars, Moon and planets are visible even in the town. Please look up at the real starry sky with this Planisphere app. ・ Astronomical information of Nagoya City Science Museum introduces various astronomical phenomena and events. Please also click here if you would like to know more about the Planisphere app. >Astronomical information http://www.ncsm.city.nagoya.jp/study/astro/ >Planisphere http://www.ncsm.city.nagoya.jp/study/astro/hayami.html

About

星空ナビ

Features
Read full description

「星空ナビ」は、星空の「今」がわかる新しい星空アプリです。ぜひ見ておきたい星空の景色から、近く見られる天文現象、神秘的な宇宙の話題まで、不思議がいっぱいの星空を思いきり楽しめます。 夕方の空にうかぶ三日月、明るく輝く宵の明星、光跡を残しながら流れる流星群、宇宙の神秘を感じさせる日食や月食といった天文現象はもちろん、最近発見された新しい星や目には見えないブラックホール、惑星探査機が活躍するニュースなどもご覧いただけます。 「星空ナビ」で、夜空の星を感じる毎日を送ってみませんか。 利用規約:https://www.astroarts.co.jp/products/navi/terms-j.shtml

Screenshots

星座早見 / Planisphere4 screens
星空ナビ4 screens

Verdict

The call

The clearest difference is rating: 星空ナビ at 4.7 against 星座早見 / Planisphere's 1.0. 星空ナビ also leads on review sentiment (29% vs 0%) and ratings volume (3 vs 1). 星座早見 / Planisphere's advantage is in-app purchases (none vs 2). On price, update cadence, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. 星空ナビ sells 2 in-app purchases, starting at $1.49 per month. 星座早見 / Planisphere asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

星空ナビ holds the better App Store score, 4.7 against 1.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews point the same way: 0% of 星座早見 / Planisphere's written reviews are positive against 29% of 星空ナビ's.

UpkeepUpdate frequency

星座早見 / Planisphere ships an update every 5 weeks, 星空ナビ every 6 weeks. Both last shipped on October 24, 2026.

Scorecard4 real differences · 6 level
星座早見 / Planisphere versus 星空ナビ: the parameters behind the verdict, then further details
Parameter星座早見 / Planisphere星空ナビ
PriceFreeFree
Rating1.0 (1 ratings)4.7 (3 ratings) — better
Positive reviews0.0% of reviews28.6% of reviews — better
Number of ratings13 — better
Update frequencyEvery 5 weeks — betterEvery 6 weeks
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.0 — better15.1
Further details — not scored
Size277 MB106 MB
Age rating4+4+
DeveloperIMAGE FACTORY CO., LTD.AstroArts Inc.

Customer experience

星座早見 / Planisphere

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

星空ナビ

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews21 reviews
Positive28.6%
Neutral14.3%
Negative57.1%

In-app purchases

None

星座早見 / Planisphere

No in-app purchases

2 purchases

星空ナビ

Subscriptions2
  • 有料会員(1ヶ月)1 Month trial$1.491 Month
  • 有料会員(1年)$13.991 Year

Questions

Is 星座早見 / Planisphere free?
星座早見 / Planisphere is free to download, with no in-app purchases.
Is 星空ナビ free?
星空ナビ is free to download, with in-app purchases available.
Which has better reviews, 星座早見 / Planisphere or 星空ナビ?
星空ナビ is rated higher. 星座早見 / Planisphere averages 1.0 out of 5 from 1 ratings, while 星空ナビ averages 4.7 from 3 ratings.
Do 星座早見 / Planisphere or 星空ナビ have ads?
Neither 星座早見 / Planisphere nor 星空ナビ shows ads.
Which is updated more often, 星座早見 / Planisphere or 星空ナビ?
星座早見 / Planisphere ships an update every 5 weeks, and 星空ナビ every 6 weeks. Most recently, 星座早見 / Planisphere was updated on October 24, 2026 and 星空ナビ on October 24, 2026.

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