See what caffeine may still be active at bedtime.
CogniFlux turns the drinks you log into educational estimates of caffeine and metabolite levels over time, alongside your bedtime and cutoff.
Timing adds context to milligrams.
A daily total cannot show when each drink may still matter. CogniFlux models an estimated rise and decline over time so you can compare different choices without treating the curve as a measurement.
Check before another cup
Equal amounts logged at 8 AM and 3 PM produce different estimated curves. See that timing difference before deciding what works for you.
See the curve, not just the cup
CogniFlux gives you a visual timeline of estimated caffeine and metabolite levels, not just a daily total.
Plan around your bedtime
Compare the estimate with the bedtime and cutoff you set. CogniFlux does not measure sleep or promise a sleep outcome.
From a drink log to useful context.
- Guessing if it's "too late" for coffee
- No timing context near bedtime
- No view of what may still be active
- Same routine, inconsistent energy
- See a modeled caffeine estimate over time
- Compare drink timing with your bedtime
- View estimated caffeine and metabolite curves
- Look for patterns in your own history
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 coffee, tea, espresso, or energy drinks in seconds. Use reference amounts from the built-in catalog or enter a custom amount.
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 is required for core logging. Cloud backup is optional, raw Apple Health samples stay on device, and diagnostics start off.
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.
Compare timing
Compare the estimate with your bedtime and cutoff, review patterns across days, and decide what timing works for you.
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
Caffeine modeling happens on your device. Raw Apple Health samples are not uploaded. If cloud backup is on, daily heart-rate aggregates may sync and can be deleted with the cloud copy.
No account required
Core logging works without signing in. If you create an account, cloud sync starts on and can be paused or its server copy deleted.
No behavioral tracking
No ad networks or cross-app tracking. We do not sell personal information. Diagnostics are off unless you turn them on.
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?
Core logging and modeling work on your device without an account. If you sign in, cloud sync is on by default and may back up your journal, settings, and derived daily heart-rate aggregates. Raw Apple Health samples are never uploaded. You can pause sync, delete the cloud copy, or delete your account.
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 an iPhone app. Version 1.0 does not include iPad, Apple Watch, Android, or a web app. Exact iOS compatibility appears on the App Store product page.
How much does it cost?
Core logging and cloud backup do not require a Pro subscription. Optional auto-renewable Pro plans add the features shown in the purchase screen; Apple displays the current localized price before purchase.
Put caffeine timing in context.
Explore how CogniFlux turns the drinks you log into educational estimates around your bedtime and cutoff.