Apple Health, both directions
Every log is written to Health as water and caffeine. Drinks logged by other apps show up in Sipcurve. Delete here, gone there.
SipcurveHealth
iPhone · iOS 17 and later
Your coffee has a half-life.
Sipcurve tracks water and caffeine in one place, shows how much caffeine is still working in your body, and tells you when to have your last cup so you actually sleep.
- No account
- No cloud
- Works with Apple Health
- Free to start
9:41
Today
0%
0 of 64 fl oz
0mg active
0 of 400 mg
Logged today
Today
Caffeine
History
Settings
- Interactive widgets
- Lock Screen widgets
- Apple Health, both ways
- Siri and Shortcuts
- Full dark mode
The curve
Half of your 3 PM coffee is still there at 8.
Caffeine leaves the body slowly, with a half-life of about five hours. Sipcurve adds up every cup, decays it in real time, and projects what will still be active when you go to bed. Over 50 mg and you get a warning, plus the latest time you could still have a coffee.
Today's caffeine tap a drink to remove it
At bedtime64 mgAbove the 50 mg sleep threshold
Last coffee by12:02 PMFor an 8 fl oz coffee
Active caffeine50 mg sleep thresholdBedtime
Widgets
Log from the Home Screen. Never open the app.
Every widget has real buttons. One tap logs the drink, fills the ring and writes to Apple Health, right where you are. Timelines refresh on every log and every half hour, so the caffeine number is never stale.
Drinks
Seventeen drinks, real numbers.
Every built-in drink carries caffeine per serving from USDA, Mayo Clinic, manufacturer data and Brazilian studies (Camargo & Toledo, Srebernich et al. and Rocha et al.), and a hydration factor, so your latte counts toward your water goal, just not as much as water does. Pro adds unlimited custom drinks.
hydration factormg per typical serving
Everything else
Quiet features that do the work.
Reminders that know when to stop
Pick an interval and quiet hours. Smart reminders pause once you hit your goal and back off if you just logged something.
Time for waterYou're at 62%. A glass gets you to 75%.
Streaks with a weekly freeze
Hit your water goal, keep the streak. Pro covers one missed day per week automatically, so a bad Tuesday doesn't erase a good month.
History you can take with you
Weekly and monthly bars against your goal, averages and records. Export everything as CSV whenever you like. Your data is yours.
Your drinks stay on your iPhone.
There is no account to create and no server to trust. Sipcurve stores your drinks in a local database that only you and your widgets can read.
- No account, no sign-in, no email
- No cloud sync and no servers of ours
- Anonymous usage counts only: no personal data, no tracking, no ads. Turn them off in Settings
- Network traffic is limited to those counts and to purchase validation through the App Store and RevenueCat
Pricing
Free for the basics. Pro for the curve.
Log as much water and caffeine as you like and see when to have your last coffee, for free, forever. Pro adds the caffeine curve, a cut-off alert, every widget, Health sync and full history. Prices in US dollars; the App Store sets local prices.
Yearly
$9.99/ year
7-day free trial
Works out to $0.83 a month. New subscribers pay nothing until the trial ends.
Start free trialLifetime
$29.99once
Pay once, keep Pro forever. No subscription, no renewal.
Get the app| What you get | Free | Pro |
|---|---|---|
| Unlimited water and caffeine logging | ||
| Active caffeine right now | ||
| Bedtime projection and “Last coffee by”Caffeine left at bedtime, and the latest time for one more coffee | ||
| 17 built-in drinks and 5 presetsFree: edit and reorder, plus 2 custom presets | ||
| Caffeine curve and cut-off alertHour by hour, plus an alert 30 minutes before your coffee cut-off | — | |
| Home Screen widgetsFree: Small. Pro: Medium, Large and Lock Screen | Small | All |
| HistoryFree: last 7 days | 7 days | Everything |
| CSV export of everything you logged | ||
| Apple Health sync, write and import | — | |
| RemindersFree: one a day. Pro: smart interval with quiet hours | 1 a day | Smart |
| Unlimited custom drinks and presets | — | |
| Streak freeze | — |
Upgrade inside the app; Apple handles payment. The yearly plan starts with a 7-day free trial for new subscribers, then renews automatically every year unless cancelled at least 24 hours before the trial or the current period ends. Manage or cancel in iPhone Settings, Apple Account, Subscriptions. Lifetime is a single purchase and never renews.
FAQ
Questions people ask.
Do I need an account?
No. There is nothing to sign up for. Your data lives in a local database on your iPhone. If you delete the app, the data goes with it, so export a CSV first from Settings if you want to keep it. Export is free on every plan.
How accurate is the caffeine curve?
It is a model, not a blood test. Sipcurve uses first-order decay with a five-hour half-life, which is the average for healthy adults, and lets you set anything from three to seven hours. Use it for timing and trends rather than exact numbers.
What counts toward my water goal?
Everything you drink, weighted by a hydration factor: water counts fully, coffee and cola at 90 percent, energy drinks at 80 percent. You can set the goal yourself or let Sipcurve suggest one from your weight.
Which widgets are free?
The Small Home Screen widget, with the water ring and one tappable preset, is free. Medium, Large and the three Lock Screen widgets are part of Pro.
Does it work with Apple Health?
Yes, in Pro. Sipcurve writes water and caffeine to Health and can import drinks logged by other apps. Permission is asked only when you turn the feature on, and you can revoke it in the Health app at any time.
Can I cancel? Is Lifetime really one payment?
Subscriptions can be cancelled anytime in your iPhone settings and stay active until the end of the paid period. Lifetime is a single purchase tied to your Apple Account, restorable on any of your iPhones.
Is there an Android version?
No. Sipcurve is built for iPhone with iOS 17 or later, and leans on iOS features like interactive widgets, Lock Screen widgets and HealthKit.
Does Sipcurve collect any data?
To validate purchases, RevenueCat receives an anonymous app user ID, your Sipcurve purchase history and basic device information such as app version and locale. Sipcurve also sends anonymous usage counts, such as how many drinks were logged from a widget or how often the Pro screen was opened. They carry no personal data, no drink names or amounts, and nothing that tracks you across apps. They go to TelemetryDeck, a privacy-focused analytics service, and you can turn them off in Settings, under Privacy.
Sipcurve for iPhone
Drink smarter. Sleep better.
Free on the App Store. Pro for $9.99 a year after a 7-day free trial, or $29.99 once.
Download on theApp Store