Comparison

Utsuro’s diary vs Rainbow Sea

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

Head to head
About

Utsuro’s diary

Engage in a chilling diary exchange with an obsessive girlfriend. What begins as a popular trend quickly escalates into a terrifying nightmare for the main character.

Highlights
  • Diary exchange gameplay
  • Obsessive girlfriend narrative
  • Socialable high school student protagonist
  • Nightmare escalation
  • Interactive story
Features
Read full description

Scary diary exchange with an obsessive girlfriend. Main character 「Hataro」has a girlfriend and is a socialable regular high school student It’s a diary exchange. It’s popular these days Hataro-kun. Don’t you know? Everyone’s doing it. The girlfriend 「Utsuro」’s idea to start the popular diary exchange. The slightest trigger was the beginning of a nightmare...

About

Rainbow Sea

Embark on a pixel-art adventure where you nurture relationships with seven gods aboard a treasure ship. Your choices shape a bittersweet story with multiple endings, offering replayability. Discover events and uncover the gods' true natures through dialogue and interaction.

Highlights
  • Isometric pixel-art graphics
  • Chiptune-inspired music
  • Branching narrative with multiple endings
  • Relationship building with seven gods
  • Interactive dialogue system
  • Event discovery based on conditions
Read full description

Rainbow Sea is an adventure game with beautiful character designs, isometric pixel-art, nostalgic chiptune-flavored music, and a sometimes funny, sometimes sad story. You can clear this in a couple of hours, but you can play it again and again as the story changes depending on your choices and actions, and there are many ways to reach a single ending. The player spends a year as Human, chosen to be a god, nurturing relationships with the Seven Lucky Gods aboard the treasure ship. You can move freely around the ship by tapping the screen. By talking to the Seven Lucky Gods, you can get their affection. New events will occur under certain conditions such as winning their affection, weather, and events you have seen so far. There are over hundred different types of events. You can find the conditions of each event by watching advertisements, so it is easy to find. Not all of the Seven Lucky Gods characters will open up to you right away, and as you interact with them, you'll start to see what they're up to. You'll start to see what they're dealing with, and since many of them won't reveal their true colors until you get to know them, you may find yourself going through the game with a somewhat unsettled feeling. In addition, Rainbow Sea allows you to lie, so you can hide your true feelings from the Seven Lucky Gods and change the course of the story. You can enjoy character designs that greatly reflect the personalities of each of the Seven Lucky Gods, music which is like a fusion of Japanese style and chiptune, and a bittersweet scenario. We are also planning to update the character graphics and pixel-art animation in the near future.

Screenshots

Utsuro’s diary3 screens
Rainbow Sea4 screens

Verdict

The call

The clearest difference is in-app purchases: Rainbow Sea at none against Utsuro’s diary's 5. Utsuro’s diary's advantage is ratings volume (443 vs 28) and iOS requirement (9.0 vs 12.0). On price, rating, review sentiment and update cadence 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. Utsuro’s diary sells 5 one-off in-app purchases. Rainbow Sea asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.6 for Utsuro’s diary against 4.6 for Rainbow Sea. That said, the two scores are not equally well evidenced: Utsuro’s diary has 443 ratings behind it against 28, so its average is the more settled of the two. Written reviews are what separate them: 77% of Utsuro’s diary's written reviews are positive against 73% of Rainbow Sea's.

UpkeepUpdate frequency

Utsuro’s diary ships an update every 5 weeks, Rainbow Sea every 6 weeks. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

Scorecard4 real differences · 6 level
Utsuro’s diary versus Rainbow Sea: the parameters behind the verdict, then further details
ParameterUtsuro’s diaryRainbow Sea
PriceFreeFree
Rating4.6 (443 ratings) — better4.6 (28 ratings)
Positive reviews76.8% of reviews — better73.3% of reviews
Number of ratings443 — better28
Update frequencyEvery 5 weeks — betterEvery 6 weeks
AdsYesYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.0 — better12.0
Further details — not scored
Size266 MB100 MB
Age rating9+12+
DeveloperYANASE GAMES, INC.Rina Okuyama

Customer experience

Utsuro’s diary

All ratings440 ratings
Positive91.8%
Neutral3.4%
Negative4.8%
Written reviews69 reviews
Positive76.8%
Neutral2.9%
Negative20.3%

Rainbow Sea

All ratings25 ratings
Positive92.0%
Neutral0.0%
Negative8.0%
Written reviews45 reviews
Positive73.3%
Neutral2.2%
Negative24.4%

Bugs and requests

Utsuro’s diary

Reported bugs

6 issues
  • App crashes when starting new story or day
  • Game crashes on iPhone 6 with iOS 12.5.1
  • Blank message on day three blocks progression
  • App closes itself after recent updates
  • Save data lost upon game reinstallation
Show 1 more
  • Crashes when opening story on certain devices

Requested features

7 requests
  • Auto-read/text-to-speech functionality
  • Player character gender customization
  • Improved dialogue clarity indicators
  • Better save data persistence across reinstalls
  • Reduced ad frequency
Show 2 more
  • More affordable pricing for all story endings
  • Improved English localization and proofreading

Rainbow Sea

Not enough reviews yet to summarise bugs or requests.

In-app purchases

5 purchases

Utsuro’s diary

One-time5
  • Akari, Utsuro happy ending$4.99
  • Natsuna and Utsuro route$7.99
  • Kokoro and Utsuro route$7.99
Show 2 more
  • Utsuro date$11.99
  • All Edition All Stories$15.99
None

Rainbow Sea

No in-app purchases

Questions

Is Utsuro’s diary free?
Utsuro’s diary is free to download, with in-app purchases available.
Is Rainbow Sea free?
Rainbow Sea is free to download, with no in-app purchases.
Which has better reviews, Utsuro’s diary or Rainbow Sea?
Utsuro’s diary is rated higher. Utsuro’s diary averages 4.6 out of 5 from 443 ratings, while Rainbow Sea averages 4.6 from 28 ratings.
Do Utsuro’s diary or Rainbow Sea have ads?
Both Utsuro’s diary and Rainbow Sea show ads.
Which is updated more often, Utsuro’s diary or Rainbow Sea?
Utsuro’s diary ships an update every 5 weeks, and Rainbow Sea every 6 weeks. Most recently, Utsuro’s diary was updated on November 6, 2026 and Rainbow Sea on November 3, 2026.

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