Know when your coffee lets you sleep.
Adenal tracks the caffeine in your body, tells you when it drops below your sleep line, and shows how your coffee timing plays out in your nights. Free for Android, iPhone and Apple Watch.
The iPhone app is in beta: install Apple's TestFlight app, then open the invite link on your iPhone.
What Adenal does
Caffeine, live
- A live curve of the caffeine in your body, projected to tomorrow morning
- Safe-to-sleep time and a last-coffee cutoff for your bedtime
- Daily limit and a warning for strong single drinks
Logging in one tap
- Big Coffee and Tea buttons with your usual amount
- More than 20 drinks built in, plus favourites, your own drinks and a barcode scanner
- Widgets, Lock Screen, Control Center, Siri and Apple Watch
Sleep, naps and bedtime
- Going to bed is recorded on its own, because lying down is not falling asleep
- Record nights and naps on a timeline; your iPhone's motion suggests when you slept
- Log how sleepy you feel, from wide awake to fighting sleep
Insights from your own nights
- After 14 nights, caffeine at bedtime compared with how long and how well you slept
- Time to fall asleep and sleepiness, with and without caffeine
- A weekly summary and streaks for healthy habits
Logged with Adenal so far
- Drinks logged
- 3
- Caffeine tracked
- 47 mg
- Nights and naps recorded
- 0
- Sleepiness check-ins
- 2
- People syncing their data
- 2
- Drinks in the catalog
- 29
Counts come from accounts that sync. Most people use Adenal without an account, so their data never reaches us and is not counted. Updated every 15 minutes.
Getting started
- Get Adenal on Google Play, or join the iPhone beta on TestFlight. Then set your usual bedtime and wake time.
- Tap Coffee or Tea whenever you have one. Other drinks are under More drinks or Scan.
- In the Sleep tab, tap Going to bed at night and I'm up in the morning, or confirm the sleep your iPhone suggests.
- Check Today for your safe-to-sleep time. After 14 nights, Insights shows what caffeine does to your sleep.
Your data stays yours
Adenal works without an account and keeps your data on your iPhone. Motion data used to detect sleep never leaves the device. If you create an account to back up and sync, you can export everything or delete it in the app or on this website. Your caffeine and sleep data is never shared with advertisers.
Common questions
Is Adenal free?
Yes. Adenal is free and shows a small ad banner on the Today, History and Insights screens. Ads are not personalized unless you turn that on in Settings → Privacy.
How does Adenal estimate the caffeine in my body?
Each drink is absorbed over the first hour or so and then broken down at a steady rate. Adenal adds up every drink from the last 48 hours using your caffeine half-life: 3 hours (fast), 5 hours (normal, the default), 7 hours (slow) or your own value. Half-life varies a lot between people, so the result is an estimate, not a measurement.
What is the sleep line?
The amount of caffeine below which you are likely to fall asleep without trouble. It is 50 mg by default; change it in Settings → Limits. Safe-to-sleep time is when your level drops below this line and stays there.
Do I need an account?
No. Without an account everything stays on your phone. An account (Sign in with Apple or email) backs up your data and syncs it between your devices.