That 3 PM coffee is why you can't sleep at midnight.
Cogniflux shows the caffeine still in your system, modeled in real time, so you can time your coffee, protect your sleep, and feel sharper every day.
Milligrams don't tell the whole story.
Most caffeine trackers count how much you drink. Cogniflux shows you what happens next, modeling the rise, peak, and slow decline of caffeine in your system so you can see the full picture.
Stop guessing, start knowing
A cup of coffee at 8 AM and one at 3 PM aren't the same. Cogniflux shows you exactly why, and what it means for your energy and sleep.
See the curve, not just the cup
Cogniflux gives you a visual timeline of estimated caffeine and metabolite levels, not just a daily total.
Wake up actually feeling rested
Understand how your caffeine choices today influence how well you sleep tonight and how sharp you feel tomorrow.
From guessing to knowing.
- Guessing if it's "too late" for coffee
- Wondering why you can't fall asleep
- No idea how much caffeine is still active
- Same routine, inconsistent energy
- Know your exact estimated caffeine level
- See how today's coffee affects tonight's sleep
- Full curve of caffeine + metabolites over time
- Data-driven habits, consistent focus
Everything you need to understand your caffeine.
Cogniflux gives you the tools to visualize, track, and learn from your caffeine intake, all in a beautifully simple interface.
Caffeine Curve Visualization
See an estimated timeline of caffeine levels in your body. Watch how each cup contributes to the overall curve throughout the day.
Metabolite Tracking
Caffeine breaks down into metabolites like paraxanthine that may continue to affect alertness and sleep. Cogniflux models these too.
Sleep Timing Insights
Get a clearer picture of how your caffeine timing may relate to sleep quality. See estimated levels at your target bedtime.
Quick Caffeine Logging
Log your coffee, tea, espresso, or energy drink in seconds. Built-in database of common beverages with accurate caffeine content.
Multi-Day View
Look back across days and weeks to spot patterns. See how different caffeine habits may correlate with better or worse mornings.
Privacy-First Design
No account required, no ad networks, no selling your data. Optional sync features are always under your control.
Three steps to caffeine clarity.
Log your caffeine
Tap to log coffee, tea, espresso, or any caffeinated drink. Choose from the built-in database or enter custom amounts.
Watch the curve
Cogniflux models the pharmacokinetics of caffeine metabolism and displays an estimated concentration curve over time.
Make better choices
See estimated caffeine levels at bedtime, identify patterns across days, and adjust your timing for better sleep and focus.
Real results from real caffeine habits.
"I finally understand why I crash at 2 PM. Turns out my morning double shot is still wearing off when I stack another one on top."
Morning double-shot drinker
Espresso lover
"Moved my last coffee from 4 PM to 1 PM based on the curve. The difference in my sleep quality was immediate."
Former late-afternoon sipper
Better sleep in 3 days
"As a nurse working rotating shifts, seeing my caffeine levels at bedtime helped me plan around my schedule instead of guessing."
Night shift RN
Shift worker
Built on established pharmacokinetic research.
Cogniflux uses published models of caffeine absorption and metabolism to generate its estimates. The app models caffeine's primary metabolic pathway, including the conversion to paraxanthine and other metabolites.
- Based on peer-reviewed pharmacokinetic models of caffeine metabolism
- Models first-order absorption and multi-compartment elimination
- Includes primary metabolite pathways (paraxanthine, theobromine, theophylline)
- Estimates are illustrative; individual metabolism varies based on genetics, liver function, medications, and other factors
Cogniflux is a wellness and education tool. It does not provide medical advice, diagnosis, or treatment. Estimates are based on population-average pharmacokinetic parameters and may not reflect your individual metabolism.
Your caffeine data is yours.
You control your data
All caffeine modeling happens on your device. Optional sync features like heart rate tracking are always under your control, and you can turn them off at any time.
No account required
Start using Cogniflux immediately. No sign-up needed. Create an account only if you want optional sync features.
No behavioral tracking
No ad networks, no behavioral analytics, no data brokers. We never sell, share, or monetize your personal data.
Frequently asked questions
How accurate is the caffeine curve?
Cogniflux uses established pharmacokinetic models based on published research. However, individual caffeine metabolism varies significantly based on genetics (CYP1A2 enzyme activity), medications, liver health, pregnancy, smoking status, and other factors. The curve should be treated as an educated estimate, not a clinical measurement.
What are metabolites and why do they matter?
When your body processes caffeine, it breaks it down into several compounds called metabolites, primarily paraxanthine, theobromine, and theophylline. These metabolites can have their own effects on alertness, blood flow, and other processes. Cogniflux models these to give you a more complete picture.
Will Cogniflux tell me when to stop drinking coffee?
Cogniflux shows you estimated caffeine levels at different times, including your target bedtime. It gives you the information to make your own decisions. It doesn't prescribe specific cutoff times, because individual sensitivity varies.
Is my data private?
Yes. Your caffeine logs and modeling happen entirely on your device. If you choose to enable optional features like heart rate sync, that data is transmitted securely to our servers. We never sell your data, and you have full control over what is synced.
Is Cogniflux a medical app?
No. Cogniflux is a wellness and educational tool designed to help you understand caffeine better. It does not diagnose, treat, or prevent any medical condition. If you have concerns about caffeine and your health, consult a healthcare professional.
What devices does Cogniflux support?
Cogniflux is available for iPhone running iOS 17 or later.
How much does it cost?
Pricing details are available on the App Store. Cogniflux is a premium app with no ads and no hidden data monetization.
Start understanding your caffeine today.
Download Cogniflux and see the full picture of how caffeine moves through your day.