Comparison

空の青さを知る vs Crimsooon Sun

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

Head to head
About

空の青さを知る

Features
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突然降ってきた隕石に含まれるのは未知の物質・・・ しかし、ちえみはすでにその物質を研究していた。 研究を進めていくとその真実が明らかとなっていく。 他の研究員たちと会話を通して、真実を見つけて行こう。

About

Crimsooon Sun

Experience a unique mystery novel adventure where your intuition guides you through a captivating narrative. Deduce the truth by pulling the trigger on your interests, with no branching paths or game overs. Focus on unraveling the mystery as if reading a detective novel.

Highlights
  • Deductive reasoning gameplay
  • Linear narrative structure
  • Intuitive clue gathering
  • No multiple endings
  • Detective novel immersion
  • Single-shot deduction system
Features
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No Choices But Deduction.      No Game Over.      No Multiple Endings.      Your choices will change neither the story nor the movement of the celestial bodies.      The only thing you can do is pull the trigger—and deduce.      "Crimsooon Sun" is a short mystery adventure designed with a singular concept: "A mystery game you can play with the same level of focus as reading a detective novel."      The story takes place in Shirase, a regional city in the Tohoku region. It begins with the return of Mio Fujimaru, a university student who had been missing for nearly six months. She remains silent about her disappearance. However, a video exhibited at the university festival reveals a chilling sight: Misao being pushed down a wedding aisle in a wheelchair by a mysterious "the Faceless Man," while "the Dual Suns" are reflected in the window.      This is a mystery "novel" adventure. When reading a detective novel, one doesn't always have a perfect, logical solution like the detective in the story. Often, we rely on vague intuitions:      "Something about this statement feels like a lie."      "This person seems suspicious."      "This description might be related to a trick."      Such intuitive reasoning often clashes with traditional game systems that require picking the "correct" choice to proceed.      Inspired by "Mikagura Shojo Tanteidan" (Mikagura Girls' Detective Agency), a classic title released for the PlayStation by Human Entertainment, this game cuts away all unnecessary choices and branching paths. Instead, you "pull the trigger" whenever something piques your interest. With the 26 bullets of information you’ve gathered, your only task is to deduce the truth.      Defy the sun with twenty-six bullets.      Even if the revolution of the heavenly spheres cannot be stopped.

Screenshots

空の青さを知る3 screens
Crimsooon Sun4 screens

Verdict

The call

The clearest difference is price: 空の青さを知る at Free against Crimsooon Sun's $1.99. Crimsooon Sun's advantage is update cadence (every 4 days vs monthly) and iOS requirement (13.0 vs 15.5). On ads, in-app purchases and device support 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

空の青さを知る is free to download; Crimsooon Sun costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

空の青さを知る ships an update monthly, Crimsooon Sun every 4 days. The most recent releases landed on October 3, 2026 and October 2, 2026 respectively.

Scorecard3 real differences · 5 level
空の青さを知る versus Crimsooon Sun: the parameters behind the verdict, then further details
Parameter空の青さを知るCrimsooon Sun
PriceFree — better$1.99
Positive reviews—100.0% of reviews
Update frequencyMonthlyEvery 4 days — better
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.513.0 — better
Further details — not scored
Size86 MB248 MB
Age rating9+12+
Developerchiaki matsudaKyohei Yamada

In-app purchases

None

空の青さを知る

No in-app purchases

None

Crimsooon Sun

No in-app purchases

Questions

Is 空の青さを知る free?
空の青さを知る is free to download, with no in-app purchases.
Is Crimsooon Sun free?
Crimsooon Sun costs $1.99, with no in-app purchases.
Do 空の青さを知る or Crimsooon Sun have ads?
Neither 空の青さを知る nor Crimsooon Sun shows ads.
Which is updated more often, 空の青さを知る or Crimsooon Sun?
空の青さを知る ships an update monthly, and Crimsooon Sun every 4 days. Most recently, 空の青さを知る was updated on October 3, 2026 and Crimsooon Sun on October 2, 2026.

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