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Astrarium

Astrarium

Offline planetarium, sky atlas

0 ratings
2 reviews
📚 Education
🔍 Reference
Free
In-App Purchases

Details

Released
July 27, 2026
Updated
October 22, 2026

Features

Developer

Shinsuke Abe
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About

Explore the cosmos with an offline planetarium and sky atlas. View stars, nebulae, constellations, planets, and more with detailed information and adjustable time settings. Includes augmented reality features and export options.

✓Offline sky charting
✓Detailed star and object catalogs
✓Adjustable time and location settings
✓Augmented reality view
✓Meteor shower calendar
✓Satellite tracking
✓PNG/PDF export
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What's New in Astrarium

2.3

October 22, 2026

Astrarium now supports iPhone Duo, and tonight's sky is on your Home Screen, Lock Screen and Siri too. iPhone Duo • Unfold it and the sky chart fills the large inner display. Fold it again and it continues on the outer display, keeping the sky and the time. • Half-fold it and stand it on a table: the chart on the upper half, the controls on the lower half. • Folded and turned sideways, the chart stays large. Widgets, Live Activities and Siri • Home Screen and Lock Screen widgets: Moon phase, when it gets dark, the next ISS pass, tonight's cloud cover and the next event. • Follow an ISS pass or an eclipse live on the Lock Screen and in the Dynamic Island (the pin button in the events list). • Ask “Can I see the ISS in Astrarium” or “Tonight's sky in Astrarium”. • Notifications for bright ISS passes, meteor shower peaks and visible eclipses (the day before, on the day and 2 hours before), full moons (2 hours before) and the aurora (Pro). Planning • Tonight's cloud forecast, shown against the hours of darkness (MET Norway; fetched only after you allow it). • A light-pollution overlay on the observing-site map. • Sunset and astronomical-twilight (dotted) lines on the satellite and aurora world map and globe. Also • The 3D solar system map follows your finger more smoothly.

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Subscriptions & In-App Purchases

Astrarium Pro Monthly

All Pro features. Cancel any time.

$3.991 Month
7 Days trial
How to cancel Astrarium subscription ⁉️

User reviews

Most RecentHighest RatedLowest Rated

NO ENGLISH VERSION

I would love to use this app, but I could find no way for it to display anything it does in English. Where is the English version.? It was hidden from me. The developer has a real problem that needs to be fixed.
WWalshrd

地平表示時に天の川が表示されません

天の川観測用にダウンロードしました。素晴らしいアプリです。全天表示時は問題ないですが、地平表示時には天の川が表示できません。今後のアプデに期待！
337.S.Yuya

Response from developer

ご使用ありがとうございます。地平モードでも天の川を描画するようにしました（意図的にはずしておりました）。高高度で天の川が実際の見た目に近くなるよう（歪まないよう）に「心射図法」を追加しています。天の川は、NASAの公開データを使用するように変更し、天の川の濃さ（3段階）と輪郭（2段階）を選択できるようにしました。お試しください。

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FAQ

What celestial objects can I see with Astrarium?

Astrarium displays 9,096 stars up to magnitude 8, 155 deep-sky objects like nebulae and galaxies, all 88 IAU constellations, the Milky Way, planets, the Moon, major meteor showers, and satellites like the ISS and Tiangong.

Does Astrarium work offline?

Yes, Astrarium is designed to work completely offline. All sky positions are computed on the device, so you don't need an internet signal to use it.

Can I export my observations from Astrarium?

Yes, Astrarium allows you to export your sky charts in PNG and PDF formats. This is useful for documenting observations or sharing them.

What are the augmented reality (AR) features in Astrarium?

Astrarium includes an AR mode that overlays the celestial chart onto your device's camera image. This helps you identify objects in the real sky.

How does Astrarium track satellites?

Astrarium plots satellites like the ISS and Tiangong on the chart using orbital elements (TLEs) fetched from CelesTrak. These TLEs are updated periodically and computed offline once fetched.

Is Astrarium suitable for beginners?

Astrarium is suitable for beginners and experienced users alike. It offers detailed information and adjustable views, making it easy to learn about the night sky.

Does Astrarium have ads?

No, Astrarium is completely ad-free. The app description explicitly states 'No ads, no in-app purchases, no account.'

What platforms is Astrarium available on?

Astrarium is available on Mac, iPhone, and iPad, as indicated by the supported devices list.