One koi, one record.
Keep a record of where each koi came from and how it grew. Breeder, bloodline, size over time, show results and day-to-day care, all in one record.
Free for your first koi. No credit card needed.
Sample record
Kohaku — called “Hana”
- Breeder
- ◯◯ Koi Farm (Ojiya, Niigata)
- Bloodline
- ◯◯ line
- Acquired
- October 2024
- Length
- 42cm → 58cm
- Show
- 2025 Young Koi Show, 65cm class — first place
What you can keep
A whole life, in one record
Provenance
Breeder, bloodline, region, purchase date, dealer and a photo of the certificate.
Growth
Length plotted over time, with weight kept as numbers. Keep a top-view photo each year and you can see how it has grown.
Care
Feeding, salt baths, treatments, quarantine and water changes, each with a date and a note. Name your ponds and keep track of which one a koi is in.
Show history
The show, the class, the size division and the result, tied to the fish itself.
How this differs from what exists
How this differs from what exists
Provenance, not water chemistry
Apps built around pond water already exist. Koi Karte is built around where this one fish came from and how it grew.
No cap, and yours to take
Export your records as CSV at any time and keep a copy yourself. On the Hobbyist plan there is no limit on how many koi you register.
From the home of koi
Variety and care terms in the words used in Japan. Usable in Japanese and English.
Pricing
Start with one koi, free.
Free
$0no card needed
Register one koi. Provenance, growth (the length chart), care, show history and CSV export are all included.
Hobbyist
$5per month
No limit on how many koi you register. The features are the same as on Free.
If the price changes, we will tell you at least 30 days beforehand.
Notice under the Japanese Act on Specified Commercial Transactions
Where did this koi come from, and how did it grow?
Free for your first koi. No credit card needed.