Comparison

Mars Book vs ぐるぐる ZEISS IX型

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

Head to head
About

Mars Book

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The Mars Book is an app that is dedicated for observing Mars which will make close approach in summer 2020. Mars will come close to Earth from September 2020 through October 2020. Closest approach will take place on October 6, 2020. Mars Book is a highly useful Mars observing app which will indicate the location of Mars visible in the sky. It shows you why Mars Close Approach will take place, and it is explained readily using animated illustrations and star charts at a viewpoint from outer Space. Mars Close Approaches taking place 23 times from the year 2003 through 2050 will be displayed and apparent retrograde motion of Mars will be displayed. Enjoy Mars Close Approach this summer with the Mars Book app!

About

ぐるぐる ZEISS IX型

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「ぐるぐる ZEISS IX型」は、ドイツのカール・ツァイス社が製作した大型ドーム用光学式プラネタリウム「ユニバーサリウムIX(9)型」を手のひらで体験できるアプリです。 ---------------------- 光学式プラネタリウム UNIVERSARIUM Model IX ドイツのカール・ツァイス社が製作した大型ドーム用光学式プラネタリウム「ユニバーサリウムIX(9)型」です。名古屋市科学館で2011年3月から活躍しています。 スターボールと呼ばれる球体からは肉眼で見ることのできる9,100個の恒星や星雲・星団、星座絵などを投影します。LED光源(2018年に更新)の光は光ファイバーを通して恒星原板の穴に導かれており、光源の光を効率良く使えます。そのため、本来の星に近いシャープかつ明るい星像を再現することが可能になりました。すべての恒星を自然に近いパターンで瞬かせることもできます。 8台の惑星投影機は日々位置を変える惑星や太陽、月を投影します。惑星の動きや月の満ち欠けはもちろん、日食・月食を再現することもできます。

Screenshots

Mars Book3 screens
ぐるぐる ZEISS IX型3 screens

Verdict

The call

The clearest difference is iOS requirement: Mars Book at 9.0 against ぐるぐる ZEISS IX型's 12.0. On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Mars Book ships an update every 13 months, ぐるぐる ZEISS IX型 every 17 months. The most recent releases landed on October 26, 2026 and November 3, 2026 respectively.

Scorecard1 real difference · 5 level
Mars Book versus ぐるぐる ZEISS IX型: the parameters behind the verdict, then further details
ParameterMars Bookぐるぐる ZEISS IX型
PriceFreeFree
Update frequencyEvery 13 months — betterEvery 17 months
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.0 — better12.0
Further details — not scored
Size14 MB206 MB
Age rating4+4+
DeveloperVixen Co.,Ltd.IMAGE FACTORY CO., LTD.

In-app purchases

None

Mars Book

No in-app purchases

None

ぐるぐる ZEISS IX型

No in-app purchases

Questions

Is Mars Book free?
Mars Book is free to download, with no in-app purchases.
Is ぐるぐる ZEISS IX型 free?
ぐるぐる ZEISS IX型 is free to download, with no in-app purchases.
Do Mars Book or ぐるぐる ZEISS IX型 have ads?
Neither Mars Book nor ぐるぐる ZEISS IX型 shows ads.
Which is updated more often, Mars Book or ぐるぐる ZEISS IX型?
Mars Book ships an update every 13 months, and ぐるぐる ZEISS IX型 every 17 months. Most recently, Mars Book was updated on October 26, 2026 and ぐるぐる ZEISS IX型 on November 3, 2026.

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