Caffeine vs WaterSupport
How can we help?
Email [email protected] and a real person will reply, usually within two working days. Include your iPhone model and iOS version if something isn't working.
For a tour of every feature, read the guide. The same guide is in the app: open Settings › Help › Guide.
Common questions
I joined the beta but no invite arrived.
Apple sends it, usually within a few minutes, from TestFlight ([email protected]). Check your spam and Promotions folders, and any filters if your address forwards to another inbox. Install the TestFlight app first, then open the email on your iPhone. Still nothing after an hour? Write to us with the address you used and we'll send it again.
How is active caffeine calculated?
With a one-compartment model: caffeine is absorbed over about 45 minutes and cleared with a half-life of 5.5 hours by default. You can change the half-life in Insights, or pick a preset such as “Hits me hard” or “Pregnant”. Settings › How we calculate lists every source.
I forgot to log a drink. Can I add it later?
Yes. Tap the round + in the tab bar, then Log an earlier drink, or touch and hold a Quick log drink and choose Log past drink…, then set when you had it.
How do I fix or delete a drink?
In the History tab, swipe a drink to edit its time or amounts, or to delete it. Tap Select to remove several at once.
My routine counted a drink I didn't have.
Tap Skip on the Live Activity before it counts, or Undo on the notification or on Today afterwards. You can also delete it in History. If you log the same drink yourself within an hour, that counts instead, never both.
Can my routine remind me instead of counting the drink?
Yes. In the Routine tab, open the drink and turn off Count it on its own. You get a reminder with a button to log it.
My usual café doesn't count my drink.
Places are part of Pro, and need location access set to Always, so arriving counts even with the app closed. Check Settings › Privacy & Security › Location Services › Caffeine vs Water. A visit counts once you've been there 20 minutes, and only within the place's hours if you set some.
Why does my water goal go up after coffee?
After a strong coffee the app pairs a glass of water with it. It's a habit, not a correction: moderate coffee hydrates regular drinkers about as well as water.
The Apple Watch doesn't show my latest drinks.
Open the app on your iPhone once so it can sync, and make sure both devices are nearby with Bluetooth on. Drinks logged on the watch sync back the next time they connect.
Apple Health isn't updating.
Open the Health app › your profile › Apps › Caffeine vs Water, and allow Caffeine and Water. Then turn on Apple Health in the app's Settings.
How do I stop reminders?
The water chaser and last call before your last coffee each have a switch in Settings. Routine drinks can be turned off one by one in the Routine tab. You can also turn notifications off in iOS Settings.
Medical note
Caffeine vs Water gives general wellness information, not medical advice. If you're pregnant, have a heart condition, or take medication that affects caffeine, check your limits with a professional.