DRFRIEDELS®
Download on the App Store
CogniTrackMeasure first. Then train.

Your body has numbers.
So should your mind.

Seven minutes every morning: memory, attention, reaction time. CogniTrack turns that into your own baseline and reads it next to your sleep, HRV and recovery. On your iPhone. Nowhere else.

Download on the App Store Why I built it →
~7 min each morning 8 tasks, 4 domains Nothing leaves your iPhone Free — wellness, not diagnosis
CogniTrack app icon
CogniTrack home screen with cognitive, recovery and daily-routine signals

Why now

Everyone can outsource thinking now. Attention is the part you can’t.

Tools got faster. Feeds got louder. Your attention and working memory are still running on the hardware you were born with — and that hardware is now the bottleneck. CogniTrack gives you a way to see yours: one fixed protocol, your own baseline, and the recovery context around it.

Put a number on the fog

Some days you feel slower. The same test, run the same way, tells you whether that’s a mood or a pattern.

Become a cognitive athlete

Athletes don’t guess. They measure, then train. CogniTrack applies the same loop to attention and memory.

Practice, not brain games

Short tasks built on established paradigms — N-Back, Stroop, SART. No coins, no streak confetti.

Play the long game

A year of ordinary days beats one perfect test. Follow your own line, and notice what moves it.

8 tasks, 4 domains
Adapted from established paradigms
Apple Watch + Health
HRV, sleep and activity, in plain words
Zero accounts
No login, no ads, no developer cloud

Same principle

One tool that does the job. Not five that each do a slice.

DRFRIEDELS started with pocket multi-tools — the right thing to hand at the moment you actually need it. CogniTrack is the software version: one app for the daily loop, instead of a sleep tracker, a brain-game app and a spreadsheet that never speak to each other.

Why I built it

I build smart tools for a living. This one I built for myself.

I started in bioinformatics — teaching machines to find the signal in messy biological data. Two decades later the job titles have changed a lot and the mission hasn’t: build tools people can actually use.

At some point it got personal. I care about longevity — not the supplement-stack kind, the boring kind. And the research keeps pointing the same way: there is no hack. What compounds is routine. Measure the right things, train consistently, learn from your own patterns.

My own data was scattered across a dozen apps. Sleep here, HRV there, a brain-training game that talked to none of it. Nothing connected mind and body — even though anyone who has slept four hours knows they are connected.

So I built it. I set the direction and read the literature; AI agents wrote most of the code. The tasks are the ones with real pedigree in cognitive science. Morning and evening routines to bookend the day. Plain language instead of raw charts. And one rule I wouldn’t trade away: the data stays on your phone.

CogniTrack is the tool I wanted and couldn’t buy. If routine is the lever, this is the handle.

A multi-tool for your head. Useful, private, and built for a normal Tuesday — not for a lab.
— The developer behind CogniTrack Bioinformatics PhD · two decades building AI systems · nothing leaves your phone
CogniTrack daily context screen connecting routine, sleep, activity and cognition

Inside the app

Four parts. One loop.

A protocol you can repeat, a baseline you can trust, the health signals you already wear, and the links between them.

Daily routine

Seven minutes in the morning. Five at night.

The morning core is fixed on purpose — same tasks, same order, same time of day. That is what makes yesterday and today comparable. The evening close is short: recall, wind down, set tomorrow.

  • Morning: check-in, word memory, two minutes of breathing, one rotating test, delayed recall
  • Evening: day check-out, long-term recall, two-minute wind-down, tomorrow’s intention
  • Want more? The optional extension adds a second test, Stroop, a body block, a journal and Pro glucose context
CogniTrack guided morning routine with steps and timing

Measurement

Track your mind the way you track your body.

Eight tasks across four domains. Every score is measured against your own baseline, never a leaderboard — and when a task changes, its history is kept separate so the trend can’t quietly lie to you.

Working memory

Hold and juggle

Keep things in your head while you work with them.

N-BackDigit Span
Executive function

Focus and stop

Ignore the distraction. Don’t hit the wrong button.

StroopGo/No-Go
Sustained attention

Stay with it

Hold attention when nothing interesting is happening.

SARTVigilance
Processing speed

Think fast

How quickly you take something in and act on it.

Symbol-DigitReaction Time

Built on paradigms from cognitive science — N-Back, Stroop, SART and others. Adapted for daily self-tracking, which makes them good at showing your own trend and not a clinical assessment.

CogniTrack cognitive profile radar across working memory, executive function, sustained attention and speed

Apple Health & Apple Watch

Recovery, in plain words.

Your watch already records HRV, resting heart rate, sleep and activity. CogniTrack reads them and answers one question: how recovered are you today, compared with your own normal?

  • HRV, resting heart rate, sleep and activity trends
  • Today against your own 30-day normal — not a population average
  • Age-adjusted reference ranges, computed on the phone
CogniTrack Health Lab showing HRV recovery and history from Apple Watch

Patterns

Find the pattern. Then test it.

The app looks across routine, cognition and health for things that move together — late nights and slow mornings, long walks and sharp afternoons. It hands them to you as hypotheses, because that is all they are.

  • Connect sleep, activity, glucose, screen time and cognition
  • Flag unusual days and what surrounded them
  • Correlation, clearly labelled as correlation
CogniTrack correlations view linking phone use and HRV over time

A closer look

Real screens, not mock-ups.

Straight out of the app. Labels and routine order keep shifting as the protocol improves.

Home dashboard with cognitive index
Cognitive training task
Cognitive profile radar
Health Lab and HRV
Recovery and readiness
Correlations and patterns
Actionable guidance
Settings and research basis

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Privacy

Your data never leaves your iPhone.

No account. No ads. No analytics SDK. No developer cloud. I built this for my own data first, which turns out to be a very good reason to keep it local.

On the device

Results, routines and Apple Health insights are stored and computed on your phone.

No trackers

No third-party analytics, no ad IDs, no data sold. The app ships without third-party SDKs.

Honest limits

A wellness and education tool. It does not diagnose, treat, cure or prevent anything.

Read the full policy

Plain-English detail on what the app reads from Apple Health, the optional self-hosted sync, and your rights under GDPR.

Privacy policy →

The daily loop

Small, repeatable, boring. That’s the point.

Two anchors a day. What happens between them is the experiment.

1

Morning · ~7 min

Measure

Run the fixed core before the day gets loud. Same protocol every time, so the number actually means something.

2

Through the day

Train

Reaction Time and Digit Span rotate through the morning core. Want a longer session, open the Training tab.

3

Evening · ≤5 min

Close the day

Recall, wind down, set tomorrow. Then read the trend next to HRV, sleep and activity.

The DRFRIEDELS ecosystem

Multi-tools for your pockets. Apps for your routines.

Same promise on both sides: less friction, fewer things to carry, better decisions.

Shop the multi-tools → Explore DRFRIEDELS →

Physical multi-tools currently ship to US customers only.

FAQ

The questions I’d ask.

Is CogniTrack a medical device?

No. It is a wellness and education app. It does not diagnose, treat, cure or prevent disease, and it is not a substitute for medical advice. Every score is a personal tracking estimate.

Does it upload my Apple Health data?

No. Health data is read and processed on your iPhone and is never sent to me or to anyone else. Access needs your explicit permission, and you can revoke it any time in iOS Settings.

Are the tests real, or brain-game filler?

Real paradigms, adapted for daily use: N-Back and Digit Span for working memory, Stroop and Go/No-Go for executive function, SART and a vigilance task for sustained attention, Symbol-Digit and Reaction Time for processing speed. Research-informed self-tracking — not clinical instruments.

Why mix cognition with Apple Watch data?

Because sleep, recovery, stress and activity shape how sharp you are on a given day. Together they explain more than either alone. The app still frames what it finds as a hypothesis, not a cause.

Do I need an Apple Watch?

No. The tasks and routines run on iPhone alone. A Watch adds HRV, heart rate, sleep and activity, which makes the recovery and pattern views more useful.

What does an app have to do with multi-tools?

Same idea, different material. DRFRIEDELS builds focused tools that take friction out of a moment. CogniTrack does that for the daily routine.

Build it with me

Tell me what’s broken. Or test what’s next.

Two ways in: send one specific proposal, or join the small test-user list.

Bug reports & feedback

Report a bug. Share feedback. Suggest a feature.

Tell me what went wrong, what could be clearer, or what you would like CogniTrack to do next. It lands directly in my admin console — no public board, no ticket queue.

Early test group

Test the next build.

Selected pre-release builds and short, specific usability tests. No newsletter, no obligation.

  • Try selected features before public release.
  • Receive short, specific test requests rather than generic surveys.
  • Leave the test list at any time.

Start tomorrow morning

Seven minutes. Then let it compound.

Free on the App Store. No account, no ads, nothing uploaded. Optional Pro if you want the deeper features.

Download on the App Store