# iStellar

> Interactive planetarium app simulating the starry sky from any location and time. (iPhone/iPad app by AstroArts Inc..)

- Source: https://appshunter.io/ios/app/istellar/id293118835 (this page in markdown: same URL + `.md`)
- Developer: [AstroArts Inc.](https://appshunter.io/developer/293118838)
- Category: Navigation, Education
- Price: $3.99
- Rating: 4.00/5 from 1 App Store ratings · 73 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.4 · 37 MB
- Languages: American English, Japanese
- Released: 2008-10-14
- Data updated: 2026-09-02
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/istellar/id293118835/reviews.md

## What is iStellar?

iStellar is a planetarium App that shows the starry sky seen from the place and time of your choice. It is optimized for Multi-Touch control, allowing you to operate intuitively; drag to move the star chart, pinch to zoom in and out, and so on. 
The star chart can be rotated from portrait to landscape, and you can even fix the location via GPS (only for iPhone 3G).

FEATURES
- Over 16,000 star data, with name for 254 stars
- Twinkles like actual stars
- Simulates distortion (atmospheric refraction and extinction) at low altitude
- Displays the Sun, daylight, twilight, the Moon (with shape and phase), 8 planets, Pluto
- Shows name, line and picture for all constellations
- Milky Way with real tone
- Plots Messier objects and their names
- Comets with accurate position and magnitude. Data can be downloaded whenever available
- Meteor Shower Radiants
- Solar eclipse simulation with high accuracy
- Adjustable moonlight and light polution
- Landscape and azimuth / direction grid
- Beautiful animation (real-time, adjusted time, reversal)
- Simulates every second between 1 Jan 1900 to 31 Dec 2099
- Switches screen according to the device's orientation
- Zoom by pinching(3 to 180 degrees)
- Easy moving through the sky by dragging, and centering by double-tap
- Object Search function
- Free choice of location and time zone, instant setting with GPS

## Key features

- Real-time starry sky simulation
- Adjustable location and time
- Detailed celestial object data
- Intuitive multi-touch controls
- Solar eclipse simulation
- Object search function

## Recent user reviews (10 of 73)

All indexed reviews: https://appshunter.io/ios/app/istellar/id293118835/reviews.md

### 4/5 — 使い勝手はよいがiPadでもつかえるようになるといいな

*2025-05-05*

iPhoneでの使用に最適化されているのでiPadのサイズにはネイティブ対応していないのが残念。あとフォントサイズを指定できるようにして欲しい。老眼で見えん。機能的には十分で使いやすい。

**Developer response:** このたびはご利用ありがとうございます。iPadでのご利用につきましては別製品となりますが「iステラ HD」がございます。文字の大きさ指定につきましてはご要望として承り今後対応できるか検討してまいります。

### 4/5 — 恒星データー要望

*2025-01-22*

恒星迄の距離を表示して欲しい。出来たら天空表示上でもワンクリックで何光年先か表示して欲しい。現在Googleでいちいち調べています。

**Developer response:** このたびはご利用ありがとうございます。いただきましたご意見ご要望につきましては今後の改善に向け検討してまいります。

### 5/5 — 必要十分

*2024-12-05*

求めるものが何かで違うと思いますが、私はこちらのアプリで必要十分です。今見えている星を探すだけなら全く問題ないです。日付指定でその日のその時間の空の様子を確認するにも問題ないです。恒星表示も問題なく。星空アプリではこちらを1番よく利用しています。

### 4/5 — 日本語表示でわかりやすい

*2024-07-15*

天体撮影時に天体を探すときに使っています。
以前は、PCを持って行きましたが、最近は、撮影機材がスマホやタブレットだけで撮影できるので、こちらを使っています。日本語表示でわかりやすいです。
しかし、星雲はメシエだけでは少ない。NGC天体やIC天体を入れて欲しい。
ステラナビゲーターをタブレットやスマホに移行して欲しいです。

### 2/5 — コンパス連動

*2024-06-27*

iPhone13にて設定を変更したら、コンパス連動が正常になりました。

### 5/5 — レナード彗星が入りました

*2021-11-21*

ダウンロード時無かったレナード彗星が今見たら登録されてました。

### 3/5 — コンパスに連動しない

*2021-11-10*

iPhone12 Pro Maxと最新のiOS15.1で使っていますが、コンパス連動しません。
アプリケーションを一旦削除して再インストールしても変わらない。

### 1/5 — iPhone12コンパス連動しない

*2021-11-10*

Sky walkerのがまし、ダウンロードして失敗

### 5/5 — コンパス連動

*2021-02-28*

改善されましたね！
コンパスが連動してなかった時も活用させて頂いておりましたが、これからも使わせていただきます！

### 1/5 — 有料でなのに

*2021-01-09*

iphoneはコンパスに連動しませんお金返して欲しいです。

## Frequently asked questions about iStellar

### What is iStellar?

iStellar is a planetarium application that displays the starry sky as seen from any chosen location and time. It offers detailed simulations of celestial bodies and events.

### How much does iStellar cost?

iStellar is a paid application, priced at $3.99. This one-time purchase grants access to all its features.

### What devices support iStellar?

iStellar is currently supported on iPhone and iPod devices. It is optimized for iOS operating systems.

### Is iStellar suitable for children?

iStellar has an age rating of 4+, making it suitable for younger users interested in learning about space and astronomy. The app provides educational content in an engaging format.

### How often is iStellar updated?

The latest version of iStellar is 2.9.6, last updated on September 5, 2023. Updates typically include new features, bug fixes, and data enhancements.

### Does iStellar have ads?

No, iStellar does not contain advertisements. As a paid application, it offers an uninterrupted user experience focused on stargazing.

### Can I use iStellar offline?

The description does not explicitly state offline functionality. However, its core features like simulating the sky from chosen locations and times suggest it can be used without a constant internet connection.

### What kind of celestial objects does iStellar show?

iStellar displays over 16,000 star data points, the Sun, daylight, twilight, the Moon (with shape and phase), 8 planets, Pluto, constellations, the Milky Way, Messier objects, comets, and meteor shower radiants.

## Version history (last 5 releases)

### 2.9.6 — 2023-09-05

Fixed an issue where data was not reflected immediately after comet orbital element data was downloaded.
Fixed UI issue with iOS 15.

### 2.9.5 — 2020-06-02

* Fixed a possible crash on startup

### 2.9.4 — 2020-05-28

Optimization on iOS 13

### 2.9.3 — 2019-12-16

* Fixed a potential bug where the date/time display could be wrong when a scene is loaded.

### 2.9.1 — 2019-01-08

* Supports the iPhone X series.
* Fixed the error of URL call function.

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## More apps by AstroArts Inc.

- [星空ナビ](https://appshunter.io/ios/app/id1437609381)
- [アストロガイド2020](https://appshunter.io/ios/app/2020/id1488703284)
- [GearBoxTimer](https://appshunter.io/ios/app/gearboxtimer/id6758684844)
- [StellaNavigator](https://appshunter.io/ios/app/stellanavigator/id6761169816)

All apps by AstroArts Inc.: https://appshunter.io/developer/293118838

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-02.*