Pulse

Arc one · Know today

Three scores in the morning. A plan for tonight.

73% of people who abandon wearables say they didn’t know what to do with the data. Pulse answers that in ten seconds a day.

Readiness · Sleep · Effort

Scores judged against your normal — and every score shows its math.

Most apps hand you a black-box number. Pulse builds a personal baseline for every metric — a 28-day weighted memory of you — and grades each morning against it. Tap any score and it decomposes completely.

Readiness blends overnight HRV (judged in log-space, as the physiology literature says), resting heart rate, last night’s sleep and yesterday’s load — weights visible, renormalized when data is missing so absent metrics never count against you.
Sleep scores duration against your need, restorative share, continuity and schedule consistency.
Effort uses the Banister TRIMP training-impulse model, calibrated to your age.
Why did it change? Every component shows its move since yesterday — “HRV ▲37, resting HR ▲39, sleep ▼3” — so a swing is never a mystery.
No cold start — Pulse backfills a year of history on first launch, so baselines exist on day one.

Readiness 94 breakdown, plus 25 versus yesterday, each component's weight, contribution and change since yesterday

Body Signals

The early warning your body sends before you feel it.

Wrist temperature, respiratory rate, HRV and resting heart rate shift together the night before you get sick. Pulse watches all four against your personal bands and raises a calm, evidence-backed flag when several move against you at once — with tonight’s exact readings attached.

Three honest states: All clear, Worth watching, Elevated.
Cycle-aware: with cycle data, temperature and heart rate are judged against same-phase history, so a normal luteal night never false-alarms.
A heads-up, never a diagnosis — and it says so.

Body Signals sheet: all clear, with tonight's wrist temperature, respiratory rate, HRV and resting heart rate versus typical

Today’s Flow

Energy that recharges as you sleep and drains as you push.

A live 0–100 energy gauge that starts where your recovery left you — a strong readiness wakes you near full — then falls through the day with effort and stress. Beneath it, an all-day stress curve built from heart-rate elevation above your resting baseline.

Workouts are shaded as effort, never counted as stress — exercise raises your heart rate by design, and calling that stress would be lying.
The morning charge is anchored to your Readiness score, so a rough night starts you lower.
One glance answers “do I have another hard thing in me today?”

Today's Flow card: an energy tank curve reading 59 now, with an all-day stress curve below it

Tonight’s Plan

“In bed by 11:30 → about 72 tomorrow.”

The purest form of decision-not-chart: Pulse forecasts tomorrow’s readiness for three bedtime choices, using your own baselines and today’s training load. Sometimes it even tells you the extra-early night isn’t worth it — your routine matters more than heroics.

Tonight's plan card showing predicted readiness for 10:30 PM, 11:30 PM and 12:30 AM bedtimes

Arc two · Understand yourself

The features that make Pulse one of a kind.

Anyone can draw a graph. Pulse runs honest N-of-1 statistics on your life — and tells you when the answer is “no effect,” because that’s a finding too.

The Journal

Tag your evenings. See what they cost you.

One tap logs alcohol, late caffeine, sauna, stress — or any habit you invent. Once a tag has five yes-nights and five no-nights, Pulse compares your next-morning body between them with rank-based statistics and reports the measured difference:

“Alcohol: deep sleep −24m, HRV −2.6 ms, resting HR +1.1 bpm” — from 17 tagged nights against 102 without.
Magnesium showing nothing? It says “no measurable effect.” Honesty is the feature.
Log from the phone, the watch, or the home-screen widget — without opening the app.

This is the analysis a $30/month wearable subscription is famous for — built on the watch you already own.

Journal tab with behavior tags and measured alcohol insight: deep sleep −24m, HRV −2.6ms, resting HR +1.1bpm

The Correlation Lab

Run real experiments on yourself.

The Lab tests how your behaviors relate to your outcomes across 120 days — lag-aware Spearman correlation, confidence tiers, and a scatter plot of every single night so you can see the relationship with your own eyes.

Built-in hypotheses: “Big training days dent next-day recovery — ρ −0.47, 119 nights, strong.”
Build your own: pick any factor, any outcome, same-night or next-day — Pulse runs the statistics and gives a straight verdict.
Not enough evidence? It says exactly how many more days it needs.

Lab finding: big days raise next-day resting HR, strong confidence, with a scatter plot of 119 paired days and fit line

Workouts

Every session, broken down the way a coach would.

Tap any workout for the full picture: your heart-rate curve drawn over its five training zones, minutes spent in each, an aerobic-versus-anaerobic split, and the training load it earned — the exact number that feeds your fitness-and-fatigue model.

This week in zones — a stacked bar per day shows where your effort actually went.
Load earned uses the Banister TRIMP model from duration and heart-rate reserve, calibrated to your age.
Aerobic base versus anaerobic work, so you can see what a session really built.

Workout detail: heart-rate curve over zone bands, time-in-zones bars, aerobic versus anaerobic split, and load earned

Trends · Training Load · Weekly Report

Six months at a glance. A season in one chart.

A readiness calendar shows every day of the last six months as one square — illness weeks and great streaks jump out instantly. Below it, the classic fitness-versus-fatigue model tells athletes when they’re building productively and when they’re overreaching.

Training Load: CTL/ATL/TSB with phase detection and plain guidance.
Body trend: a smoothed weight line drawn over the daily noise, with the week-over-week change in your report.
Weekly Report: week-over-week scores, wins to keep, focus for next week — exportable as a share card or PDF.
Morning briefing notification and Siri: “What’s my readiness?”

Trends tab with 6-month readiness calendar heatmap and training load fitness vs fatigue chart

Every metric, in depth

Thirty-plus metrics. Each carries your personal normal range.

Cardio recovery, walking steadiness, gait asymmetry, blood oxygen, time in daylight, sleep efficiency and latency — the signals most apps drop, each with week-to-year charts, your baseline band drawn behind the data, and an honest trend verdict.

Sleep detail: last night's hypnogram of sleep stages with the overnight heart-rate curve and its low point below — Sleep, minute by minuteThe full hypnogram plus your overnight heart-rate dip, drawn from raw watch samples.

Body trend card: a smoothed weight trend line over faint daily weigh-in dots — Weight, without the panicThe trend line is the truth; the daily dots are water. Direction stated, never judged.

HRV detail chart with a personal baseline band behind the data and an improving trend — Your normal, drawn inThe gray band behind every chart is your own range — so “high” means high for you.

Arc three · Everywhere, privately

On your wrist. On your lock screen. Never on a server.

Apple Watch app

Fully standalone — the watch computes its own scores.

Pulse for watchOS reads HealthKit right on the wrist and runs the same engine over 180 days of local baselines. Scores, Body Signals, the Daily Brief, live vitals, Tonight’s Plan and two-tap journal logging — even if your iPhone is in another room. Tap a ring to jump to its detail; complications put readiness on your watch face; widgets put it on your lock screen and home screen.

Pulse watch app scores page: readiness 77 hero ring with sleep 88 and effort 33

Pulse watch journal page with one-tap behavior toggles

Privacy is the architecture

The App Store label reads “Data Not Collected.” Because there’s nothing to collect.

Pulse has no server, no account, no analytics SDK and no ads. Every score, correlation and forecast is computed on your device — and the methodology screen in the app documents every formula, with citations. Your data exports to CSV whenever you want it, because it’s yours.

network calls to Pulse servers … 0
third-party SDKs …………………… 0
account required ………………… no
analysis location ………………… on-device
your data, exportable ………… always

Pricing

Genuinely useful free. Honestly priced Pro.

Pro costs half of what the other guys charge — and there’s no hardware, no band, no monthly ransom for your own data.

$0

free forever

Readiness, Sleep & Effort scores — with full “show the math”
Daily Brief and Body Signals status
Tonight’s Plan bedtime forecast
Today’s Flow energy & stress, plus full workout breakdowns
Apple Watch app + complications + widgets
Metric explorer with personal baselines

1 week free trial

Pulse Pro

$24.99 / year

or $3.99/month · family shareable

Journal behavior insights — measured effects of your habits
Unlimited custom Lab experiments
Body Signals evidence detail
Training Load, heatmap calendar & Weekly Report
CSV + PDF export of everything