Comparison

Rain City vs Prime Flow

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

Head to head
About

Rain City

Embark on a bizarre and exciting adventure as a cat searching for his sister in the perpetually rainy Rain City. Explore a mysterious world, solve puzzles, gather clues, and uncover the truth behind the endless rain.

Highlights
  • Story-driven adventure
  • Puzzle solving
  • Character interaction
  • Minigames
  • Memory and observation challenges
  • Picture book-like graphics
Features
Read full description

The game begins with the main character, a cat, who embarks to Rain City to find his sister. The story is both bizarre and exciting making players get lost in a mushroom field, search for a secret passage, and run experiments in a laboratory. The reason rain continues in Rain City is uncovered when players find his missing sister... Players control the main character to look for his sister in the city. The story moves along while meeting various characters, gathering information, solving puzzles, and clearing minigames. There are elements that test skills including memory and observation, and the many items that appear add to its appeal to the game. The picture book-like graphics and story about animals who live like humans will draw you in to the world of Rain City.

About

Prime Flow

Explore the fascinating world of prime numbers through a minimalist puzzle game. Learn number theory through engaging gameplay, discovering patterns and unlocking lore. Designed for calm concentration and a playful approach to mathematical concepts.

Highlights
  • Explore prime patterns
  • Learn through experimentation
  • Unlock progression and lore
  • Track accomplishments
  • Clean interface for concentration
Features
Read full description

Prime Flow is a minimalist puzzle game built around one of the strangest structures in mathematics: prime numbers. Play by testing, predicting, and navigating prime patterns as the game teaches you to see number theory—through motion, rhythm, and discovery. What you can do • Explore prime patterns through fast, focused play • Learn by experimentation (no worksheets, no lectures) • Unlock progression and “Prime Lore” as you advance • Track accomplishments through achievements and milestones • Enjoy a clean interface designed for calm concentration Who it’s for • puzzle players who like logic and pattern recognition • students and teachers who want a playful way into primes • anyone who finds beauty in numbers Prime Flow doesn’t try to make math “easy.” It tries to make it fun.

Screenshots

Rain City4 screens
Prime Flow4 screens

Verdict

The call

Rain City and Prime Flow both sit at 4.0 stars, but that hides the real split: 100% of Prime Flow's written reviews are positive against 51% of Rain City's. Prime Flow also leads on price ($0.99 vs $1.99). Rain City's advantage is ratings volume (72 vs 1) and device support (4 vs 2). On rating, ads, in-app purchases and monetization model 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

Rain City costs $1.99 and Prime Flow $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.0 for Rain City against 4.0 for Prime Flow. That said, the two scores are not equally well evidenced: Rain City has 72 ratings behind it against 1, so its average is the more settled of the two. Written reviews are what separate them: 51% of Rain City's written reviews are positive against 100% of Prime Flow's.

Scorecard5 real differences · 5 level
Rain City versus Prime Flow: the parameters behind the verdict, then further details
ParameterRain CityPrime Flow
Price$1.99$0.99 — better
Rating4.0 (72 ratings) — better4.0 (1 ratings)
Positive reviews51.3% of reviews100.0% of reviews — better
Number of ratings72 — better1
Update frequencyEvery 9 days—
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS15.6 — better26.1
Further details — not scored
Size261 MB194 MB
Age rating12+4+
DeveloperCOTTONGAME Network Technology Co., Ltd.Ben Bedard

Customer experience

Rain City

All ratings72 ratings
Positive68.1%
Neutral15.3%
Negative16.7%
Written reviews115 reviews
Positive51.3%
Neutral18.3%
Negative30.4%

Prime Flow

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Rain City

Reported bugs

12 issues
  • Character gets stuck on objects/walls
  • Cat disappears in drain, blocking progress
  • Boss battle controls not working with controller
  • Automatically sent out of jail camera room
  • Bug preventing progress in jail section (apple for rat)
Show 7 more
  • Cat gets stuck when walking clockwise above sewer
  • Remote controlled car bug in factory
  • Game freezes
  • Cannot download after purchase
  • Elevator bug in underground mine
  • Dialogue text cut off
  • Sound and music missing

Requested features

9 requests
  • Add a skip option for arcade games
  • Improve character movement and controls
  • Add a hint system for puzzles
  • Improve English translation quality
  • Add Thai language support
Show 4 more
  • Option to turn off dialogue noise
  • Better sound and music implementation
  • Larger screen optimization for mobile
  • More intuitive interaction system

Prime Flow

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Rain City

No in-app purchases

None

Prime Flow

No in-app purchases

Questions

Is Rain City free?
Rain City costs $1.99, with no in-app purchases.
Is Prime Flow free?
Prime Flow costs $0.99, with no in-app purchases.
Which has better reviews, Rain City or Prime Flow?
Rain City is rated higher. Rain City averages 4.0 out of 5 from 72 ratings, while Prime Flow averages 4.0 from 1 ratings.
Do Rain City or Prime Flow have ads?
Neither Rain City nor Prime Flow shows ads.

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