Comparison

惑星AR vs CosmicObserver

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

Head to head
About

惑星AR

Explore the solar system with interactive visualizations. Understand planetary sizes and distances through intuitive modes, and learn fascinating facts with quizzes. Ideal for grasping astronomical concepts visually.

Highlights
  • Size comparison mode
  • Distance comparison mode
  • Orbit visualization
  • Interactive 3D manipulation
  • Detailed planet information
  • Quiz-based trivia
Features
Read full description

太陽から地球までの距離はどれくらいか知っていますか? 数値としては学校で習っても、 体感的にどれくらいの距離かをすぐに想像できる方は少ないと思います。 大きさや距離を感覚で理解したい方のために、このアプリを作成しました。 太陽系についての理解が深まる手助けとなれば幸いです。 <操作説明> 大きさ基準モード(惑星のサイズ比率を合わせて表示) 距離基準モード(惑星の距離比率を合わせて表示) 公転モード(惑星の公転の様子を表示) の3種類のモードがあります。 指で動かせるので、視点を変えて回転させたり、 2本指で拡大縮小もできます。 <その他の機能> ・各惑星の詳細情報、クイズ形式の豆知識付き ※公転モードは、36秒で約1年間となっています。

About

CosmicObserver

Features
Read full description

CosmicObserver lets you travel real planets — of our solar system and beyond — from an observer's first-person view. You don't pilot a ship; you drift through space with your gaze and fingertips. Lock onto stars and planets, approach, scan, and record what you observe — space as a journey, not a catalog. ■ Features ・Real astronomical bodies based on public data ・FPS view with a virtual stick for free drifting ・Scientific honesty: observed / estimated / artistic values marked by color and label ・A "Cosmic Passport" and discovery collection ・A daily destination to gently explore the cosmos ■ Cosmic Pass (one-time purchase) The solar system is free. Cosmic Pass — a single one-time purchase — unlocks all star systems, exoplanets, unlimited dailies, and the frontier beyond. Note: Exoplanet surfaces are estimations/artistic renderings, not photographs. This app is not affiliated with or endorsed by NASA. ■ In-App Purchase Cosmic Pass is a one-time purchase. There is no subscription, nothing renews, and there is nothing to cancel. After a new device or a reinstall, use "Restore purchases" on the Cosmic Pass screen or in Settings with the same Apple Account. Family Sharing is supported. Privacy Policy: https://www.rulagems.org/privacy/cosmicobserver/ Terms of Use (EULA): https://www.rulagems.org/terms/cosmicobserver/

Screenshots

惑星AR3 screens
CosmicObserver4 screens

Verdict

The call

The clearest difference is in-app purchases: 惑星AR at none against CosmicObserver's 1. 惑星AR also leads on device support (3 vs 1) and iOS requirement (12.0 vs 18.0). CosmicObserver's advantage is update cadence (every 3 weeks vs every 7 months). On price and ads 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. CosmicObserver sells 1 one-off in-app purchase. 惑星AR asks for nothing beyond the download.

UpkeepUpdate frequency

惑星AR ships an update every 7 months, CosmicObserver every 3 weeks. The most recent releases landed on October 1, 2026 and September 30, 2026 respectively.

Scorecard4 real differences · 4 level
惑星AR versus CosmicObserver: the parameters behind the verdict, then further details
Parameter惑星ARCosmicObserver
PriceFreeFree
Positive reviews100.0% of reviews—
Update frequencyEvery 7 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS12.0 — better18.0
Further details — not scored
Size81 MB226 MB
Age rating4+4+
DeveloperThunderbird, Inc.Yuichi Okuno

In-app purchases

None

惑星AR

No in-app purchases

1 purchases

CosmicObserver

One-time1
  • Cosmic Pass$4.99

Questions

Is 惑星AR free?
惑星AR is free to download, with no in-app purchases.
Is CosmicObserver free?
CosmicObserver is free to download, with in-app purchases available.
Do 惑星AR or CosmicObserver have ads?
Neither 惑星AR nor CosmicObserver shows ads.
Which is updated more often, 惑星AR or CosmicObserver?
惑星AR ships an update every 7 months, and CosmicObserver every 3 weeks. Most recently, 惑星AR was updated on October 1, 2026 and CosmicObserver on September 30, 2026.

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