Koiven: Water Tracker

Koiven is a water tracker that turns drinking water into a calm daily habit. Every drink you log fills a living fish tank on your phone, so hydration stops being a number you chase and becomes something you watch happen.

Most drink water apps are a spreadsheet with a glass icon. Koiven is an aquarium water tracker instead. Log a glass and the tank rises. Your fish, Zenna, swims through it. Tap her and she darts away. Reach your daily water goal and the tank fills to the top. It is a water tracker with a pet, and the tank itself is the reward.

The whole app is built to feel quiet. Soft colors, unhurried animation, no guilt, nothing shouting for attention. If you want a cozy water tracker you can open for ten seconds and close feeling a little better, that is what this is.

Koiven is a fully offline water tracker. No account, no email, no sign-up. Your data stays on your phone, and you can start tracking water intake about five seconds after you install it. If you ever want a copy of your history, backup is your own Google Drive snapshot, or a plain file you save yourself. It stays in your control.

As a water intake tracker it stays simple. Set a daily water goal, or let Koiven suggest a hydration goal from your weight and activity level. Track your daily water intake in milliliters or ounces. Build a hydration streak one logged day at a time, and see your week fill in at a glance. Drink water reminders arrive only inside the hours you choose, at the interval you choose, and stop for the night when you say so. A water reminder should fit around your day, not interrupt it.

Water, tea, coffee, and juice are ready to log the moment you open the app. Custom drinks are free for everyone. Name it, pick a shape, choose a color, and it is yours. Every drink counts fully toward your goal.

Free to download. There are no ads while you are logging, on the Home screen, or on your tank. Optional Pro unlocks more fish, more themes, and all eight drink slots, and removes ads everywhere.

Open it. Log a drink. Watch your tank fill.

Koiven is a hydration tracking tool, not medical advice.