KoiLog: Koi Pond Tracker

KoiLog is the private, offline-first logbook for backyard koi keepers. No account. No cloud. Yours forever. Everything you track in a notebook, done properly: WATER TESTING Log temperature, pH, ammonia, nitrite, nitrate, KH, GH, salt, dissolved oxygen and TDS in seconds. Charts with koi-safe range bands show trends at a glance. FEEDING GUIDE KoiLog reads your latest water temperature and tells you exactly how to feed — from winter dormancy (do not feed) to summer growth feeding. Koi are cold-water fish, and KoiLog covers the whole year. YOUR KOI COLLECTION A profile for every fish: variety, photos, growth measurements with length/weight charts, source, value and status. Watch your tosai grow into jumbo. MAINTENANCE & TREATMENTS Recurring tasks with reminders — water changes, filter cleans, UV bulbs. Log salt or medication treatments with an active day counter. The built-in salt calculator doses therapeutic salt correctly for your pond volume (salt is an optional treatment — koi are freshwater fish). PRIVATE BY DESIGN Everything stays on your device. No sign-up, no subscription required, no tracking. Export your data to CSV anytime. FREE: 1 pond, 5 koi, 3 tasks, 30 days of charts, salt calculator and feeding guide. KOILOG PRO: unlimited everything, full history, collection stats and CSV export — one-time lifetime purchase or monthly. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://koi-log.com/privacy.html