Quick Answer: The best overall circadian rhythm app is ARC, because it turns your chronotype into a daily plan (caffeine cutoff, morning light timing, peak hours) instead of only reporting on last night. For passive sleep tracking and biometric statistics, Oura Ring or AutoSleep are the top choices, while Rise Science excels at energy prediction. Not sure of your chronotype yet? Take the free chronotype quiz.
Disclosure: we make ARC. We've tried to be fair about where the others are stronger.
Not all sleep apps are created equal. Some track your sleep. Some wake you up gently. A few actually tell you how to structure your entire day around your biology. We ranked eight of the most popular circadian and sleep apps on what matters: actionable circadian guidance, not just sleep scores.
2026 Circadian App Comparison Matrix#
| App | Annual Price | Hardware Needed? | Chronotype Precision | Real-Time Caffeine Decay | Morning Light Timer | Core Strength |
|---|---|---|---|---|---|---|
| ARC | $39.99/yr | None | High (Lion/Bear/Wolf/Dolphin) | Yes (Live mg decay) | Yes (Dynamic Island) | Daily Action Plan & Rhythm Calibration |
| Rise Science | $69.99/yr | None (Watch helpful) | Moderate (Algorithmic) | Basic static cutoff | No (Push alert only) | Sleep Debt & Energy Schedule |
| Lifestack.ai | $60–$96/yr | Wearable Required | Moderate | Basic time blocks | No | Calendar Time-blocking |
| Bodly | Free / Freemium | None | None | Basic half-life tool | No | Simple Caffeine Web Calculation |
| Timeshifter | $24.99/yr | None | Low (Trip only) | Binary drink/skip | Light shift advice | Travel Jet Lag Only |
| Oura Ring | $349+ & $5.99/mo | Oura Ring Mandatory | Moderate (Chronotype tag) | None | No | Passive Biometrics & Sleep Stages |
| WHOOP | $239+/yr | WHOOP Strap Mandatory | None | None | No | Recovery & Athletic Strain |
| AutoSleep | $5.99 one-time | Apple Watch Mandatory | None | None | No | Apple Watch Sleep Tracking |
What Separates a Circadian App from a Sleep Tracker#
A sleep tracker tells you what happened last night. A circadian rhythm app tells you what to do today — and tomorrow — based on your biology. The difference is profound. Sleep scores are retrospective. Chronotype-based protocols are prescriptive.
Most popular apps fall into the sleep tracker camp. Very few are actually built around chronobiology. Here is how the top apps rank in 2026.
1. ARC: Circadian Rhythm Tracker — Best Overall#
ARC is built around one question: what should I be doing right now? Instead of passively recording data, it plans your day. A 22-step onboarding across 6 acts identifies your chronotype (Lion, Bear, Wolf, or Dolphin) and lays out your day as phases (light window, peak, dip, caffeine cutoff, wind-down) that shift with your chronotype. It tracks your caffeine with a real-time decay curve, times your morning light with a 20-minute timer that runs in your Dynamic Island, and presents one clear sentence and one action at a time. After about ten days of one-tap energy check-ins, it measures when your afternoon dip really lands and corrects the window you picked.
Key features: a caffeine cutoff that moves every time you log a drink, a morning light window from today's real sunrise (worked out from your time zone, no location permission) with a Dynamic Island Live Activity, five-day single-habit experiments, and Trends that show your afternoon crashes per week from your own check-ins. Your log stays on your iPhone: no account, no server holding your history.
Where it falls short: no sleep staging, HRV or wearable data. ARC plans your day rather than measuring your body, so pair it with a tracker if you want biometrics.
Platform: iPhone only. $39.99/year with a 7-day free trial, or $4.99/week.
2. Rise Science — Best for Energy Prediction#
Rise is one of the best-known pure circadian apps. It uses a proprietary algorithm to predict your energy levels throughout the day and identify your "peak" and "dip" windows. The UX is polished and the Energy Schedule feature is genuinely useful.
Where it falls short: Rise reminds you when to stop caffeine and get light, but (at the time of writing) doesn't track milligrams per drink or run a light timer in the Dynamic Island. Rise leans on your recent sleep data to model energy, which is great for predictions but doesn't account for the coffee you actually drank today. It also costs $69.99/year—75% more than ARC. Read our complete Rise Sleep App Alternative guide.
Price: about $69.99/year at the time of writing.
3. Lifestack.ai — Best for Calendar Integration#
Lifestack connects your wearable data (Apple Watch, Oura, WHOOP) directly to Google Calendar or Microsoft Outlook, scheduling work tasks around your predicted energy peaks.
Where it falls short: Lifestack requires hardware wearables to function effectively. Its price ($60–$96/year) is significantly higher than ARC ($39.99/year), and it lacks pharmacokinetic caffeine tracking or Dynamic Island light timers. Read our head-to-head Lifestack vs ARC comparison.
Price: about $60–$96/year at the time of writing.
4. Bodly & CaffCalc — Best Basic Caffeine Web Tools#
Bodly offers a clean online caffeine half-life calculator that visualizes caffeine decay in a browser. It is a handy single-purpose utility for checking basic half-life math.
Where it falls short: Bodly is primarily a standalone web calculator, not a full circadian operating system. It does not calibrate against your chronotype, set morning sunlight timers, plan your afternoon dip, or sync dynamically on iOS. For dedicated mobile apps, see our ranking of the 5 Best Caffeine Tracker Apps for iPhone, or test ARC's free caffeine half-life calculator for an interactive experience.
Price: Free web tool / freemium app features.
5. Timeshifter — Best for Jet Lag#
Timeshifter uses circadian light-shifting algorithms to help travelers and astronauts adjust to rapid time zone transitions. It provides strict flight-by-flight light-exposure and melatonin schedules.
Where it falls short: Timeshifter is built for travel; once your trip ends, it offers no everyday workflow, daily focus planning, or ongoing caffeine decay tracking. Read our complete Timeshifter Alternative guide.
Price: about $24.99/year or $9.99 per flight plan.
6. Sleep Cycle — Best Smart Alarm#
Sleep Cycle's core use case is its sleep tracking and smart alarm — it wakes you during light sleep to minimize grogginess. The sleep tracking data is solid for trend analysis, and its AI sleep coach adds some basic guidance.
Where it falls short: Sleep Cycle is reactive (tells you about last night) not proactive (tells you what to do today). It has no chronotype setup, no caffeine cutoff, and no morning light timing. It is a sleep tracker, not a circadian rhythm app.
Price: about $39.99/year at the time of writing.
7. AutoSleep — Best for Apple Watch Users#
AutoSleep is the gold standard for Apple Watch sleep tracking. The readiness score and sleep quality breakdown are excellent for users deep in the Apple ecosystem.
Where it falls short: No circadian guidance whatsoever. It tells you your sleep quality; it does not tell you when to drink coffee, when to focus, or what your chronotype means for your work schedule. A useful complement to ARC, not a replacement.
Price: about $5.99 one-time at the time of writing.
8. Oura Ring App — Best Hardware-Connected Experience#
Oura's app is excellent if you already own the ring (from about $349 at the time of writing). The readiness score, HRV trends, and sleep staging data are among the best available. The Advisor AI feature adds personalized coaching.
Where it falls short: Requires expensive hardware. Oura shows your chronotype and body-clock timing but (at the time of writing) no caffeine cutoff from your actual drinks and no morning light timer. For software-only daily timing guidance, ARC is more actionable.
Price: Ring from about $349 at the time of writing, plus a $5.99/month membership.
9. WHOOP — Best for Athletes#
WHOOP is built for recovery tracking and athletic performance. Its strain and recovery metrics are best in class for endurance athletes. The sleep coaching is improving but remains secondary to the performance focus.
Where it falls short: It's an ongoing membership with a wearable you have to keep on, and it is not designed around chronobiology. Its sleep coaching is built around recovery rather than your chronotype's timing.
Price: annual membership with the band included (tiers vary; check whoop.com).
The Verdict#
If you want passive sleep tracking: AutoSleep (Apple Watch) or Sleep Cycle. If you want recovery data for athletic training: WHOOP. If you have $350+ for hardware and want the richest biometric dataset: Oura. If you want an energy-based calendar assistant with a wearable: Lifestack. If you want a science-backed daily plan for your biology without expensive hardware: ARC.
Weighing two of these? See our detailed comparisons:
- Rise Sleep App Alternative
- Lifestack vs ARC Circadian App
- Timeshifter Alternative
- Oura Ring vs ARC
- WHOOP vs ARC
ARC is built to answer the question your body is actually asking: What should I be doing right now?