
Free
In-App Purchases
Rating summary
About
Medaka Log is a breeding and lineage manager for medaka (Japanese rice fish / ricefish) keepers. Start simply by logging the variety and count in each container, then grow into full lineage management — crosses, generations (F-values), and family trees.
Note: The app interface is in Japanese.
- Daily records: manage containers and lots; log water changes, feeding, and health checks in one tap, with photos
- Spawning & hatch forecast (guideline): from accumulated water temperature, see the estimated hatch date and progress, with local reminders
- Lineage: auto-numbered generations (F1, F2…), a generation tree, and retention-rate trends from selection records
- Genotype prediction (reference, known recessive/dominant traits only) and inbreeding coefficient (COI)
- 3-generation pedigree PDF (variety, F-value, COI reference) to attach to the fish you sell
- Container QR labels for quick on-site logging
- Sales records with CSV export; a per-line dashboard for counts, sales, and hatch rate
Records are stored on device and no account is required. An optional cloud share can sync records and photos across your own devices, and an optional weather link can estimate outdoor water temperature. Hatch, genetic, and COI predictions are guidelines only.
[Terms of Use / Privacy]
Terms of Use (Apple standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://yoooooui.github.io/medaka-app/privacy.html
Medaka Log Pro is a one-time purchase. Cloud Sharing is a monthly auto-renewable subscription; it renews automatically unless canceled at least 24 hours before the end of the period. You can manage or cancel it in the App Store under Subscriptions.
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What's New in メダ活帳
1.2.0
August 29, 2026
- Added iPad support - Water temperature is now shown as a daily range chart, with the spawning comfort range and risky temperatures marked - Expanded the variety guide to 49 varieties across 8 lineages (traits, how hard they are to fix, what to look for when selecting) - Notifications can now be turned on/off by type, with an option to stay silent at night - Added an annual plan for Cloud Sharing - Stability improvements
MoreSubscription plans
クラウド共有
複数端末でのデータ同期とクラウドバックアップ
$1.991 Month
14 Days trial1
In-App Purchases
$3.99
メダ活帳プロ
血統書PDF・品評会記録・販売管理・QRラベル・CSVを解放







