BrewMeter - Caffeine Tracker

Caffeine countdown, widgets, sleep-safe timing, monthly history and CSV export in one private tracker. Your metabolism, decoded.

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 CURRENT CAFFEINE

Check your caffeine level on a beautiful exponential decay curve. BrewMeter shows when you'll dip below your sleep threshold, giving you 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

With permission, entries can sync with Apple Health, and BrewMeter compares caffeine intake with your actual sleep duration. Discover patterns you never noticed: maybe that afternoon tea lines up with shorter nights.

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
• 30+ common beverages ready to log
• Daily goal tracking from 100 to 600 mg
• Day, week, and month history with CSV export
• 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 tracking, no accounts required

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.