Your Apple Watch knows when you're recovered.Your nutrition app should too.

Tide is the first nutrition coach that adjusts your daily targets based on your sleep, HRV, and training load automatically.

see how it works
140+ on the waitlist·apple watch series 8+·ios 17 · iphone
signals tide reads, every morning
sleep stages
heart rate variability
training load
wrist temperature
apple health · healthkit
the gap

most apps treat your body like a spreadsheet.

you log food into a static target you set in january. but your body is different every day last night's sleep, today's hrv, last week's training. tide is the only coach that closes that loop.

the static approachunchanged
2,400 kcalunchanged for 92 days
one number from january. same target on rest days, push days, and recovery weeks. set in onboarding, forgotten thereafter.
mtwtfss
the weekly approachtrend-based
2,400 → 2,460over 7 days, on average
adjusts based on weekly weight averages. helpful for direction, but blind to recovery you'll still under-eat through a poor sleep streak.
mtwtfss
the tide approachdaily · adaptive
2,160 → 2,640recalibrated nightly
reads four signals from your watch every morning. today's number reflects last night's sleep and tomorrow's training not last quarter's goal.
mtwtfss
how it works

four signals in. one number out.

every morning at 6 a.m., tide pulls the same data your watch already collects, runs it through an on-device ai model that learns your body, and delivers a target you can actually trust with the reasoning right next to it.

01 · INPUT
the four signals from your wrist.
pulled directly from healthkit. no extra hardware, no manual logging. each signal is weighted by recency, variance from your baseline, and how predictive it has been for you historically.
sleep
+1h 18m↑
hrv
62 ms↑
strain
9.4↓
temp
−0.1°C↑
tide modelrecalibrating
output · today's target
2,640
+320 kcal vs your baseline. carb-leaning. front-load before 3 p.m. to support tomorrow's leg session.
carbs +48gprotein +12gfat −6g
02 · AI MODEL
trained on your body, not the average person.
most apps use one formula for everyone. tide's on-device model builds a personal baseline in your first 14 days, then re-weights every signal based on how predictive it has been for you. private by design inference runs locally on your phone.
hrv-guided periodization shows +12% recovery improvements vs static programming in trained populations.
vesterinen et al., scand j med sci sports, 2016
03 · COACH
an ai you can interrogate, not a black box.
ask in plain english on your watch. tide answers using the same signals it set your target with and shows its reasoning if you tap to expand. ambient by default, transparent on demand.
can i have dessert tonight?
tide · 1syes 200 kcal worth. you're at 1,820 / 2,640 and tomorrow's a rest day. lean toward something with protein.why? hrv was high · strain low · sleep 7h53
the field

a category of one.

tide sits at the intersection of nutrition tracking, hrv monitoring, and ai coaching. each existing category does one of these well. tide is the first to do all three.

tidestatic appstrend-based appsrecovery wearables
target updatesdaily · automaticmanual onlyweeklyno targets
uses recovery data✓ four signals✓ recovery only
macro coaching✓ contextualfixed split✓ weekly
conversational ai✓ on-devicechat assistant
shows reasoning✓ every adjustmentweekly notesrecovery score
extra hardwarenone just watchnonenone$30+/mo strap
price$6.99/mo · 14-day free trial$20/mo$12/mo$30/mo
the product

six coaching moments. quiet by default.

tide shows up when it has something to say and stays quiet otherwise. glance at the watch. decide on the phone. get back to your day.

on iphone
today · the home dashboard
good morning. 1,142 kcal remaining of 1,980. today’s adjustment pulled targets back 200 kcal sleep was 6:42, hrv dipped 18%.
Tide on iPhone Today screen showing recovery-aware calorie ring, today’s adjustment, and macros.Tide on iPhone Morning brief showing today’s calorie target with reasoning signals and meal plan.
Tide on Apple Watch refuel cycle notification showing 3 nights of low HRV and a recommended 2,700 kcal target
on apple watch
a glance is the whole interaction.
“i stopped checking in weekly. tide just tells me what to eat.”
marisa, beta tester · mom of two, slept 6h last night
pricing

simple, honest, no surprises.

free forever for manual tracking. pro unlocks the adaptive engine the only thing that actually makes your nutrition app smarter than a spreadsheet.

free
$0forever
acquisition · explore tide before you commit
  • manual food logging
  • basic apple watch sync
  • 1 nutrition goal
  • 7-day history
  • no adaptive engine
  • no recovery insights
start free
most popular
pro · monthly
$6.99/month
14-day free trial · cancel anytime
  • everything in free, plus:
  • adaptive engine daily target recalibration
  • full apple watch app + complications
  • recovery insights (hrv, sleep, strain, temp)
  • refeed-day detection
  • unlimited history + weekly trends
start 14-day free trial
save 40%
pro · annual
$49.99/year
$83.88$4.17/mo · 14-day free trial
  • everything in pro monthly, plus:
  • 40% off vs paying monthly
  • price locked for 12 months
  • priority email support
  • early access to new features
start 14-day free trial

every plan starts with a 14-day free trial. no credit card needed up front, cancel anytime from your account.

questions

things people ask before they sign up.

how is this different from a weekly trend-based tracker?
weekly trend-based trackers are excellent at adjusting calories from weekly weight averages a closed feedback loop on the scale. tide is a different loop. we use real-time recovery data (hrv, sleep, strain, wrist temperature) to adjust today's target, not last week's. the two can coexist: a weekly tracker for direction over months, tide for the right call this morning.
do i need a whoop, oura, or other strap?
no. tide reads everything from your apple watch via healthkit. if you also wear another wearable or a cgm, we can pull supplementary signals but we built this so a single watch is enough.
which apple watch models are supported?
series 8 and newer (including se 2nd-gen and ultra). we need wrist temperature and the newer hrv pipeline, which were introduced with watchos 9 on series 8. series 6/7 with ios 17 will work in a degraded mode (three signals instead of four).
how accurate is the daily recalibration in the first 14 days?
tide uses population priors during onboarding while it learns your baseline. by day 14 we've got a personal hrv/sleep distribution and the model switches to your weights. most users see meaningfully different targets by week three.
what about my privacy?
health data stays on-device by default. aggregate model training is opt-in, end-to-end encrypted, and we never sell or rent your data. you can export or delete everything from settings, and we don't run analytics sdks that profile you for ads. we're funded by you, not advertisers.
when does tide launch?
public testflight opens this quarter you'll get an invite the moment it does. early waitlist signups get access first and help shape the roadmap. app store launch is targeted for late summer.
how does the free trial work?
every paid plan starts with a 14-day free trial. you get the full pro experience adaptive engine, recovery insights, watch app, everything. no credit card needed up front. on day 14 we ask if you want to continue, and you can cancel anytime from settings or the app store with one tap.