BrewMeter - Caffeine Tracker

That 3 PM espresso felt like a great idea. But now it's midnight, you're staring at the ceiling, and you have no idea how much caffeine is still coursing through your body. Sound familiar?

BrewMeter puts an end to the guesswork. See exactly how much caffeine is in your system right now, when it will wear off, and whether that next cup is going to cost you a good night's sleep.

YOUR BODY, YOUR METABOLISM

Not everyone processes caffeine the same way. BrewMeter builds a personalized metabolism profile based on real science. Answer a quick questionnaire and get a custom half-life calculation that accounts for factors like smoking, oral contraceptives, and your natural metabolism speed. Because a 5-hour half-life is just the average — yours might be very different.

SEE YOUR CAFFEINE IN REAL TIME

Watch your caffeine level drop in real time on a beautiful exponential decay curve. The live chart updates continuously, showing you exactly when you'll dip below your sleep threshold. No more mental math — just a clear, visual answer to "can I sleep yet?"

SMARTER TIMING, BETTER ENERGY

Stop fighting your biology. BrewMeter's cortisol-aware timing engine tells you the optimal windows for caffeine based on your natural cortisol rhythm. Drink during peak cortisol and you're wasting your coffee. Drink during the dips and you'll feel it where it counts.

PREDICT BEFORE YOU POUR

Curious what a double shot at 4 PM would do to your sleep? The What-If Simulator lets you test any scenario before committing. Add a hypothetical drink, see how it shifts your decay curve and sleep-ready time, then decide if it's worth it.

UNDERSTAND YOUR TOLERANCE

Drinking more but feeling less? BrewMeter tracks your caffeine tolerance over time and offers guided reset protocols — choose between a gentle taper or a clean-break cold turkey plan. Take back the buzz.

APPLE HEALTH & SLEEP INSIGHTS

Every entry syncs with Apple Health, and BrewMeter correlates your caffeine intake with your actual sleep data. Discover patterns you never noticed: maybe that afternoon tea is the reason your deep sleep dropped 20%.

WIDGETS THAT WORK FOR YOU

Glance at your current caffeine level and sleep-ready time right from your Home Screen or Lock Screen. No need to open the app — your most important numbers are always one look away.

DESIGNED FOR YOU

BrewMeter is built with respect for your time, your privacy, and your data. No ads, no tracking, no accounts required. Your data stays on your device and in your iCloud — we never see it. Just a clean, focused tool that does one thing exceptionally well.

BUILT FOR COFFEE LOVERS

- 30+ pre-populated beverages with lab-accurate caffeine data
- Custom drinks for your local roaster's secret blend
- Daily goal tracking from 100 to 600 mg
- Rich history with daily, weekly, and monthly analytics
- Beautiful dark theme with warm amber and gold tones
- Syncs seamlessly across all your devices with iCloud
- Full localization in English, French, German, Spanish, Brazilian Portuguese, Italian, and Japanese
- Your data stays on your device and in your iCloud — we never see it
- No ads, no account, no subscriptions

Whether you're optimizing performance, cutting back, or just trying to sleep before 2 AM, BrewMeter gives you the clarity to make every cup count.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://bnjdpn.github.io/BrewMeter/privacy.html

Download BrewMeter and take control of your caffeine.