Comparison

Mars Book vs Zahyo78

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

Zahyo78

Features
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『座標の位置を特定して、4つのミッションの完了を目指そう!』 ■遊び方■  各ミッションで位置が10回特定できるとクリアーです  全部で3回ミスするとミッション失敗です ●ミッション1  小惑星がぶつかってできた岩のかけらが航行を阻んでいる。  座標を特定して排除せよ! ●ミッション2(x軸について対称な点)  宇宙機雷が仕掛けられた。  磁気嵐により、レーダーの表示位置が左右反転してしまった。  座標を特定して排除せよ! ●ミッション3(y軸について対称な点)  彗星が残した氷の塊が散らばっている。  重力波でレーダーの表示位置が上下反転してしまった。  座標を特定して排除せよ! ●ミッション4(原点について対称な点)  ブラックホールの影響でレーダーの表示位置が上下左右反転してしまった。  座標を特定して、クリスタルを回収せよ! ■Special Thanks■  効果音ラボより音データを利用させていただきました

Screenshots

Mars Book3 screens
Zahyo784 screens

Verdict

The call

The clearest difference is iOS requirement: Mars Book at 9.0 against Zahyo78's 15.0. 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, Zahyo78 every 22 months. The most recent releases landed on October 26, 2026 and November 4, 2026 respectively.

Scorecard1 real difference · 5 level
Mars Book versus Zahyo78: the parameters behind the verdict, then further details
ParameterMars BookZahyo78
PriceFreeFree
Update frequencyEvery 13 months — betterEvery 22 months
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.0 — better15.0
Further details — not scored
Size14 MB52 MB
Age rating4+9+
DeveloperVixen Co.,Ltd.Hiroyuki Nakano

In-app purchases

None

Mars Book

No in-app purchases

None

Zahyo78

No in-app purchases

Questions

Is Mars Book free?
Mars Book is free to download, with no in-app purchases.
Is Zahyo78 free?
Zahyo78 is free to download, with no in-app purchases.
Do Mars Book or Zahyo78 have ads?
Neither Mars Book nor Zahyo78 shows ads.
Which is updated more often, Mars Book or Zahyo78?
Mars Book ships an update every 13 months, and Zahyo78 every 22 months. Most recently, Mars Book was updated on October 26, 2026 and Zahyo78 on November 4, 2026.

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