Rikka — Shape the world's snow
Snowflakes from live weather
About
Witness the real-time growth of unique, six-fold symmetric crystals based on live weather data from snowy cities. Explore how temperature, humidity, wind, and pressure influence crystal complexity and density. Each crystal's origin city is displayed, allowing you to locate it on a map.
What's New in Rikka
1.0.87
May 9, 2026
Improved performance.
Developer apps
FAQ
What kind of graphics does Rikka use?
Rikka utilizes hexagonal cellular automata to grow intricate, six-fold symmetric crystals in real-time. The complexity and density of these crystals are directly influenced by live weather data.
Does Rikka have ads?
Yes, Rikka contains advertisements. As a free application, ads are displayed to support its development and continued operation.
How does Rikka determine crystal shapes?
The app pulls live weather data from snowy cities worldwide. Temperature affects complexity, humidity influences density, wind creates variation, and pressure introduces ripple patterns, all shaping the unique crystal.
Can I see where the weather data for my crystal comes from?
Yes, Rikka displays the city whose weather inspired each crystal on the screen. You can also find this city on an interactive map within the application.
What devices does Rikka support?
Rikka is currently supported on iPhone and iPod devices. It is designed for iOS mobile platforms.
What is the age rating for Rikka?
Rikka has an age rating of 4+. This indicates it is suitable for children aged 4 and above, with no mature content.
How often is Rikka updated?
The latest version of Rikka is 1.0.87, last updated on May 9, 2026. While specific update frequency isn't detailed, this indicates active development.
What is the user rating for Rikka?
Rikka has a user rating of 3.5 stars based on 2 ratings. This suggests a mixed reception from its current user base.
