Koiven turns drinking water into something you actually want to open. Log a drink and your on-screen aquarium fills: the water rises and your fish, Zenna, swims. Under the calm surface it's a complete tracker: personalized daily goal, streaks, weekly dots, and free custom drinks. Private by design: fully offline, no account, no email. Your data stays on your device. Free to use; Pro unlocks more fish, themes, and drink slots. Android today, iOS once the app funds it.