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 pilot Pilot build · Updated August 2026
See what's active.Protect what comes next.
CafeineX turns the stimulant moments you log into a calm view of timing, exposure, and sleep context—without pretending your body is a simple number.
✓ Local-first✓ No advertising✓ Apple Health 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, saved items, and patterns stay on your device. Health access is optional and granular.
Inside the latest pilot build
More capable.
More considerate.
The newest CafeineX build improves the first five minutes, the daily logging flow, and the moments when data or permissions need extra care.
New
A guided first run
Choose your sleep schedule and sensitivity before the first entry, with clear steps and no account required.
Faster
Quick Add
Log caffeine, nicotine, or a saved drink or cigarette profile without breaking your flow.
Optional
Sleep-stage timeline
Review recent Apple Health sleep stages and timing context, processed in memory when you choose to connect.
New
Cigarette intelligence
Notice counts, timing, pairings, and proximity to your sleep window—without absorption estimates or causal claims.
In control
Complete data controls
Review or delete local data anytime, with an optional request to remove linked caffeine samples written by CafeineX.
More resilient
Visible storage recovery
Save failures are never hidden. Retry, preserve a local recovery copy, or start fresh with an explicit choice.
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 composed view. No dashboard designed to punish you. No medical certainty where none exists.
Active rangeA central estimate plus a transparent fast-to-slow range.
Personal cutoffPut your next dose beside the sleep schedule you chose.
Optional sleep contextReview timing beside recent readable Apple Health sleep stages.
Right nowYour window is open
✦ Low≈150 mgActive estimate
◷1:00 PMSuggested cutoff
150 mg today400 mg general reference
Likely active range: 150–150 mgAt 10:00 PM: 18–61 mg estimated
The complete CafeineX loop
Four surfaces.
One calm experience.
Move from a fast log to focused search, a complete timeline, and a weekly reflection without losing the context behind each moment.
01 · Search
Everything you need, one gesture away.
Jump into recent events, filter caffeine, nicotine, or cigarettes, and reach guidance, appearance, and privacy controls from one focused surface.
02 · Adaptive Home
The message changes when the context does.
When a slower estimate remains elevated near bedtime, Home shifts from an open window to clear sleep-priority guidance.
03 · History
Your complete pattern.
Search, filter, and compare caffeine, nicotine, and cigarette moments across a focused 30-day view.
04 · Profile
Reflect without pressure.
See focus, reviewed days, exposure totals, and after-cutoff moments as context—not a judgment.
Trust has to survive the edge cases
Privacy, deletion, and recovery are part of the product.
Separate Health permissions
Caffeine and sleep access are requested independently. Core tracking works without either.
Local-first records
Your events, saved items, profile, settings, and pattern summaries remain on your device.
Delete All Data
Remove local records, settings, and recovery copies—with an optional request for linked CafeineX-written Health caffeine samples.
Honest recovery
If storage fails, CafeineX shows the issue and lets you retry, preserve a local copy, or start fresh.
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.
- ✓Guided onboarding, Quick Add, and an improved first-run Home
- ✓Active-caffeine range, sleep-window context, and a personal cutoff
- ✓Searchable history, saved profiles, drink details, and weekly reflections
- ✓Optional Apple Health caffeine sync and recent sleep-stage context
- ✓Cigarette timing intelligence with careful, non-causal language
- ✓Local data controls, visible save errors, and storage recovery choices
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.
What is new in the latest pilot build?
Guided onboarding, Quick Add, sleep-stage context, cigarette timing intelligence, stronger data controls, and visible storage recovery.
Does cigarette intelligence estimate nicotine absorption?
No. It focuses on counts, timing, pairings, and proximity to your sleep window. It does not estimate absorbed nicotine or claim a cause-and-effect relationship.
Can I delete all of my data?
Yes. The in-app deletion flow removes local CafeineX records, settings, and recovery copies. You may also request deletion of linked dietary caffeine samples that CafeineX wrote to Apple Health.
Do I need Apple Health?
No. Local tracking works without Apple Health. Dietary caffeine sync and recent sleep-stage context use optional, separate permissions.
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.