Comparison

Exoplanet vs 星座早見 / Planisphere

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

Head to head
About

Exoplanet

Explore a vast, interactive database of discovered exoplanets and their host stars. Visualize their physical properties, locations in the night sky, and orbital paths. Discover the observable universe from Earth to the cosmic microwave background with stunning 3D models and augmented reality features.

Highlights
  • Interactive visualizations and animations
  • Daily updated exoplanet and host star properties
  • 3D Milky Way model with exoplanet locations
  • Augmented reality sky map
  • Exoplanet orbit and habitable zone visualizations
  • Data from multiple exoplanet catalogs
Features
Read full description

Exoplanets are planets orbiting stars beyond our own solar system. This app allows you to explore all discovered exoplanets, their measured physical properties, their location in the night sky, and their host stars. An interactive model shows you the entire observable universe, all the way from the surface of the Earth to the cosmic microwave background. This app has been developed by a professional astronomer. Main features: * Interactive visualizations and animations. * Physical properties of all detected exoplanets and their host stars, updated on a daily basis. * Stunning 3D model of our Milky Way showing the location of all known exoplanets. You can zoom into any planetary system, explore how the night sky and the constellations look from the surface of other planets, or zoom out and see other local galaxies and galaxy clusters as well as the cosmic microwave background. * Visualizations of exoplanet orbits and the habitable zone. * Choose between the Open Exoplanet Catalogue, the NASA Exoplanet Archive, and the Extrasolar Planet Encyclopedia (exoplanet.eu). * Push notifications are sent out whenever a new planet is discovered. * Augmented reality sky map: point the phone towards the sky to find an exoplanet! * Interactive multi-touch correlation plots. * Solar System planets, major moons, and asteroids are included. * Explore S-Stars orbiting the black hole at the Galactic Center of our Milky Way * Background information about exoplanets and detection methods. * Full support of planets in binary, triple, quadruple systems and orphan planets. * Real-time ray tracing on the GPU.

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

Screenshots

Exoplanet4 screens
星座早見 / Planisphere4 screens

Verdict

The call

The clearest difference is review sentiment: Exoplanet at 91% against 星座早見 / Planisphere's 0%. Exoplanet also leads on rating (4.7 vs 1.0) and ratings volume (956 vs 1). 星座早見 / Planisphere's advantage is in-app purchases (none vs 7). On price, 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. Exoplanet sells 7 one-off in-app purchases. 星座早見 / Planisphere asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Exoplanet holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: Exoplanet has 956 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 91% of Exoplanet's written reviews are positive against 0% of 星座早見 / Planisphere's.

UpkeepUpdate frequency

Exoplanet ships an update every 2 weeks, 星座早見 / Planisphere every 5 weeks. The most recent releases landed on September 21, 2026 and June 24, 2026 respectively.

Scorecard7 real differences · 3 level
Exoplanet versus 星座早見 / Planisphere: the parameters behind the verdict, then further details
ParameterExoplanet星座早見 / Planisphere
PriceFreeFree
Rating4.7 (956 ratings) — better1.0 (1 ratings)
Positive reviews91.0% of reviews — better0.0% of reviews
Number of ratings956 — better1
Update frequencyEvery 2 weeks — betterEvery 5 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod, Apple TV — betteriPhone, iPad, iPod
Requires iOS13.0 — better15.0
Further details — not scored
Size105 MB277 MB
Age rating4+4+
DeveloperHanno ReinIMAGE FACTORY CO., LTD.

Customer experience

Exoplanet

All ratings956 ratings
Positive93.0%
Neutral2.0%
Negative5.0%
Written reviews476 reviews
Positive91.0%
Neutral3.2%
Negative5.9%

星座早見 / Planisphere

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

Bugs and requests

Exoplanet

Reported bugs

2 issues
  • Upgrade purchase issues with Galaxy Clusters and CMB add-on
  • Kepler objects of interest disappearing when switching databases

Requested features

9 requests
  • Add more detailed textures and visuals for exoplanets
  • Ability to view multiple databases simultaneously
  • Option to see planet surfaces and atmospheres
  • Inclusion of dwarf planets in our solar system
  • Ability to zoom in on and explore other galaxies
Show 4 more
  • Addition of black holes, pulsars, and other celestial objects
  • Inclusion of satellite and spacecraft orbits
  • Narration or audio commentary for key discoveries
  • Ability to view the universe from the surface of planets

星座早見 / Planisphere

Not enough reviews yet to summarise bugs or requests.

In-app purchases

7 purchases

Exoplanet

One-time7
  • Galaxy Clusters and CMB$0.99
  • Asteroids$0.99
  • Gaia Stars$0.99
Show 4 more
  • S-Stars$0.99
  • Catalogues$0.99
  • Developer Appreciation Coffee$1.99
  • Kepler Add-on$2.99
None

星座早見 / Planisphere

No in-app purchases

Questions

Is Exoplanet free?
Exoplanet is free to download, with in-app purchases available.
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, Exoplanet or 星座早見 / Planisphere?
Exoplanet is rated higher. Exoplanet averages 4.7 out of 5 from 956 ratings, while 星座早見 / Planisphere averages 1.0 from 1 ratings.
Do Exoplanet or 星座早見 / Planisphere have ads?
Neither Exoplanet nor 星座早見 / Planisphere shows ads.
Which is updated more often, Exoplanet or 星座早見 / Planisphere?
Exoplanet ships an update every 2 weeks, and 星座早見 / Planisphere every 5 weeks. Most recently, Exoplanet was updated on September 21, 2026 and 星座早見 / Planisphere on June 24, 2026.

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