Stop Fighting
Your Biology
ARC maps your Perfect Day using chronobiology. Discover your chronotype, find your Peak Focus Windows, and unlock performance that lasts.
Inside the App
Your day, mapped.
What's Inside
Every tool your
biology needs.
22-Point Precision Diagnosis
Builds your full biological profile — sleep schedule, energy map, caffeine habits, lifestyle context — before the first paywall.
Dynamic Daily Trajectory
A live 24-hour timeline of biological missions — from sunrise to sleep.
Chronotype Discovery
Lion, Bear, Wolf, or Dolphin — your identity mapped to your biology.
Caffeine Half-Life Tracking
Log every drink. Watch the live decay curve. Know the exact minute it's safe to sleep.
Peak Focus Windows
Scientifically timed deep work intervals when your brain is sharpest.
Morning Sunlight Anchoring
Cortisol & melatonin rhythm optimization starting the moment you wake.
Manual Sleep Check-in
Rate last night's sleep each morning. Poor sleep triggers a recovery-mode protocol — sunlight early, caffeine delayed 90 minutes.
Contextual Intel Feed
Daily briefings driven by your actual yesterday — not a static article library. Behavior-aware coaching that adapts.
Biological Briefings
Context-aware coaching with the peer-reviewed science behind each action.
Local-First Architecture
SQLite on-device storage. Your biological data never leaves your phone.
The Process
Three steps to your
Perfect Day.
Take the Diagnosis
Answer 22 science-backed questions about your sleep, energy patterns, caffeine habits, and lifestyle. ARC builds your full biological profile — the longest onboarding in the category.
Discover Your Chronotype
Find out if you're a Lion, Bear, Wolf, or Dolphin — and what it means for your daily schedule and peak performance windows.
Follow Your Daily Trajectory
Get a live 24-hour protocol with Peak Focus Windows, caffeine decay tracking, sunlight timer toward your 20-min morning target, and smart wind-down notifications.
Your Identity
Which one
are you?
Your chronotype is your body's built-in biological clock. ARC identifies yours in 5 minutes.
Lion
Early RiserPeak energy in the morning. You do your best deep work before noon. Protect your mornings fiercely.
Bear
Solar RhythmYou follow the sun. Steady energy during daylight with a natural afternoon dip. The most common chronotype.
Wolf
Night OwlPeak creativity and energy in the evening. You're wired for late nights and slow mornings.
Dolphin
Light SleeperIrregular patterns and light sleep. Highly alert and anxious. Your schedule needs the most precision.
Why ARC
Built different.
By design.
Science-Backed, Not Guesswork
Built on peer-reviewed circadian research from Stanford Neuroscience and UC Berkeley Sleep Science. Every recommendation has a citation.
Privacy-First Architecture
All data stays on your device with local-first SQLite storage. No cloud sync, no data harvesting — ever.
Not Another Habit Tracker
ARC doesn't just track what you do — it tells you when to do it. Aligned with your biology, not arbitrary goals.
Built for High Performers
Designed for founders, creators, and biohackers who treat their energy like a resource — not an afterthought.
The Science
Biology you can
actually use.
ARC is built on peer-reviewed chronobiology — not habit tracking folklore. Here's the science powering every recommendation.
- Sleep Pressure
Adenosine
The Adenosine Clear
Adenosine builds up in your brain from the moment you wake. It creates sleep pressure that makes you feel tired. Caffeine doesn't remove it — it just masks the signal. ARC calculates the exact window to wait before your first coffee, preventing your 2 PM crash.
- Morning Anchor
Cortisol
Cortisol Pulse Timing
Morning sunlight triggers a cortisol spike that sets your entire daily rhythm — including when you'll feel alert and when melatonin will rise 12–16 hours later. ARC gives you a precise sunlight window within minutes of your wake time.
- Sleep Onset
Melatonin
Digital Sunset Protocol
Melatonin release is triggered by your morning cortisol spike and suppressed by evening light. ARC's Digital Sunset protocol tells you exactly when to dim screens and lights to let your natural sleep signal rise — every night.
Sample Biological Briefing
“Strategic window. Waiting 90 mins after waking prevents your 2 PM focal crash.”
ARC delivers context-aware coaching in plain language — with the science behind every action, not just a to-do list.
Research Foundation
Dr. Andrew Huberman
Stanford Neuroscience Lab
Light exposure, cortisol rhythms & adenosine management
Dr. Matthew Walker
UC Berkeley Center for Sleep Science
Sleep architecture, circadian cycles & melatonin optimization
Smart Notifications
Nudges that speak your biology
Not generic reminders. Every alert is timed to your chronotype and written in plain language — so you know exactly why it matters.
Coffee time
~90 min after wakeYour adenosine has cleared. Coffee now gives you clean energy without the afternoon crash.
Caffeine wall — stop now
~early afternoonEvery coffee after this point costs you 15–20 min of deep sleep. Your cutoff is now.
Start winding down
~1 hr before sleepMelatonin production is ramping up. Dim lights and reduce screen brightness.
All notifications are chronotype-aware and delivered at the right moment for your schedule — not a generic template.
Who It's For
High performers
think in energy.
High-Performers
Founders, engineers, and creators who need maximum focus hours. ARC maps your peak windows so you stop guessing.
Coffee Drinkers
You drink coffee every day but have never understood how it actually interacts with your sleep. ARC shows you the exact cutoff minute.
ADHD Professionals
Structured visual missions replace overwhelming to-do lists. Biology-aligned triggers your brain actually responds to.
Sleep Seekers
Sleeping 7-8 hours but still exhausted? It's a timing problem, not a duration problem. ARC fixes the root cause.
Biohackers
Real data and correlations — not just streaks and checkboxes. Understand the cortisol-melatonin rhythm driving your entire day.
Remote Workers
Design your flexible schedule around biology, not just calendar availability.
Pricing
Start free.
Upgrade when ready.
Annual plan includes a 3-day free trial. Weekly is instant access, cancel anytime.
Weekly
$4.99/ weekGet Instant AccessCancel anytime
Annual
Save 86%$34.99/ yearStart Free Trial3-day free trial
Have questions or a tight budget?
Whether you want to understand the science better, or you're a student experiencing financial hardship, we don't want price to be a barrier to your health.
Payment charged to Apple ID at purchase confirmation. Subscription auto-renews unless canceled 24h before end of period. Manage in App Store account settings.
FAQ
Questions
answered.
What is a chronotype?
A chronotype is your body's natural preference for when to sleep and wake. There are four types: Lion (early riser), Bear (solar rhythm), Wolf (night owl), and Dolphin (light sleeper). ARC identifies yours through a 22-point precision diagnosis.
How is ARC different from a sleep tracker?
Sleep trackers tell you how well you slept last night. ARC tells you how to structure your entire day — when to do deep work, when to have caffeine, when to get sunlight, and when to wind down. It's proactive, not reactive.
Is ARC based on real science?
Yes. ARC is powered by peer-reviewed chronobiology research from Dr. Andrew Huberman (Stanford Neuroscience) and Dr. Matthew Walker (UC Berkeley). Every recommendation has a scientific basis.
Does ARC collect my health data?
No. ARC uses a local-first architecture — all your data is stored on your device using SQLite. Nothing is sent to external servers. You can delete everything at any time from app settings.
What does the caffeine cutoff feature do?
Caffeine has a half-life of 5–6 hours. ARC calculates your personal cutoff time based on your sleep schedule so caffeine doesn't interfere with your sleep quality.
Is there a free trial?
The Annual plan includes a 3-day free trial. The Weekly plan is instant access with no trial — cancel anytime. The free tier includes core chronotype discovery and daily trajectory with no time limit.
Start Today
Your biology has
a schedule.
Stop guessing when to focus, rest, and recharge. ARC shows you exactly when — backed by science.
Download on theApp StoreFree to download · 3-day Pro trial · No credit card needed