A range, not a false promise
See an active-caffeine estimate with uncertainty built in, so the number supports a decision instead of pretending to be a diagnosis.
CafeineXJoin the pilotPrivate pilot for iPhone
See what's active.Protect what comes next.
CafeineX turns the stimulant moments you log into a clear view of timing, exposure, and sleep context—without pretending your body is a simple number.
✓ On-device first✓ No advertising✓ HealthKit optional
150 mgActive estimate
1:00 PMSuggested cutoff
A more honest stimulant tracker
Not another score telling you to be perfect.A clearer signal for your next choice.
Your response changes with timing, sensitivity, sleep, and context. CafeineX keeps that uncertainty visible—and keeps the language human.
Your timing, in context
Place caffeine and nicotine events beside your planned sleep window and optional Apple Health sleep context.
Private by design
Your timeline, profile, goals, and patterns stay on your device. Health access is optional and granular.
Built for the decision window
One glance. The context that matters now.
CafeineX brings your active estimate, likely range, personal cutoff, and today's exposure into one calm view. No dashboards designed to punish you. No medical certainty where none exists.
Active rangeSee a central estimate and a transparent fast-to-slow range.
Personal cutoffPut your next dose beside the sleep schedule you chose.
Optional sleep contextReview timing beside your latest readable Apple Health sleep snapshot.
Right nowYour window is open
✦ Low≈150 mgActive estimate
◷1:00 PMSuggested cutoff
150 mg today400 mg reference
Likely active range: 150–150 mgAt 10:00 PM: 18–61 mg estimated
The whole pattern, not just today
History that helps you notice.
Search every logged event, filter the timeline, and turn a week of small moments into something you can actually understand.
01Search everythingFilters by date, source, and exposure type.
02Reflect without pressureGoals and streaks reward awareness, not stimulant use.
Your health context stays yours
Built around permission, restraint, and clarity.
CafeineX works without Apple Health. If you choose to connect it, caffeine and sleep permissions are requested separately. Sleep samples are summarized in memory, not copied into the CafeineX database.
✓ No sale of personal or health data✓ No health data for advertising✓ Nicotine records remain local✓ Permissions stay under your control
Read the full privacy policy →Help shape the launch
Join the CafeineX private pilot.
Test the experience before the App Store release and help us find the moments that need to feel faster, clearer, and more trustworthy.
- ✓Log caffeine and nicotine moments in seconds
- ✓Review active-caffeine ranges and cutoff guidance
- ✓Explore history, filters, weekly patterns, and personal goals
- ✓Connect optional caffeine and sleep context from Apple Health
Pilot invitations are opening soon.
The public TestFlight invitation will appear here as soon as the external beta is ready. Bookmark this page and check back shortly.
Requires an iPhone with Apple's TestFlight app. Pilot capacity may be limited.Before you join
Good questions.
Straight answers.
Is CafeineX medical advice?
No. CafeineX is a personal awareness tool. Its estimates and pattern summaries do not diagnose, treat, prevent, or establish the cause of a health outcome.
Do I need Apple Health?
No. Local tracking works without HealthKit. Dietary caffeine sync and sleep context are optional, separate permissions.
What should I test?
Focus on clarity, logging speed, history accuracy, useful context, accessibility, and anything that makes you hesitate or lose trust.
Will my beta data be permanent?
Beta software can change. Back up anything important, expect migrations, and review each build's testing notes before relying on it.