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Breeding calculator
Build two parents, then simulate a spawn with the game’s own breeding code. You’ll see every variety, named form, variant and grade the pair can produce, and what the fry are worth.
Results
Grades
Varieties
Named koi ·
Best fry in this spawn
Find a route to a variety
The simplest pair of other varieties that produces the one you want, worked out from the game’s genetics.
First-cross grid
Every pure pairing and the most common fry it produces. A number shows the share when the top result is under 90%; D means doitsu, H means butterfly fins. Tap a cell to load it above.
| Drawing the grid… |