Apple gives you a score. This gives you tonight's move.

Nattra reads last night, tells you the one thing worth doing before bed, and never pretends to know more than it does.

Nattra app icon Coming soon to iPhone iOS 17 or later
Last night drawn as the moon: 6 hours 8 minutes of sleep lights about three quarters of it.
Last night 6 h 08 · short of a 7–9 h need ± 15 min, from Apple Watch

Your month, drawn as a sky.

Each night is a star at its own height, brighter the longer you slept. The band of dust is your need — a range, never a single number. Only last night is ever marked amber.

Thirty nights as stars. Most sit just under a need range of 7 to 9 hours; last night, 6 hours 8 minutes, is the one amber star. NEED 7–9 H 27 AUGLAST NIGHT Fourteen nights as stars. Most sit just under a need range of 7 to 9 hours; last night, 6 hours 8 minutes, is the one amber star. NEED 7–9 H 12 SEPLAST NIGHT
Demo nights. Yours come from Apple Health. Drag across the month · ← → when focused
Your need7–9 h
Wake time± 9 min
Last night6 h 08

One night, and the one move that matters.

Scroll through one night ↓
  1. Caffeine cutoff12:15 pm
  2. Wind-down9:15 pm
  3. Tonight's one moveIn bed by 10:15 pm30 min earlier than usual
  4. Sleep6 h 08 ± 15 minshort of your 7–9 h need
  5. Wake6:40 am ± 9 min
  6. Morning light6:40–7:40 am

What Nattra refuses to show you.

Score out of 100

One number claims precision your sleep data doesn't have.

Sleep stages

Not measurable from a wrist or a phone, and weakly tied to how your day goes.

Smart-cycle alarms

The 90-minute wake window isn't backed by evidence.

Streaks

Trying harder to sleep makes sleep worse. One rough night breaks nothing.

When sleep is a fight, the numbers go away.

If you lie awake despite plenty of time in bed, Calm Mode switches off sleep debt entirely and coaches only a steady wake time and a gentle wind-down.

It also points you to CBT-I, the first-line treatment for insomnia — starting with free programmes from the US VA. Calm Mode is never behind a paywall.

Most of it is free. For good.

Nattra Facts
1 night per serving · last night 6 h 08 ± 15 min
Never shownAmount
Scores out of 1000
Sleep stages guessed0
Streaks0
Data collectedNone
Always shownAmount
Numbers shown as rangesAll
Claims with a sourceAll
Actions per night1
Calm ModeFree, always
Rules, not settings. Every claim opens its source in the app.
Free Always
  • Last night and your month of nights
  • Wake-time consistency
  • Morning-light and warm-shower timing
  • The morning check-in
  • Calm Mode
Premium $29.99 a year or $4.99 a month
  • Sleep debt, with its range drawn
  • Your personal need range
  • Caffeine cutoff and nap window
  • Your chronotype
  • Your full history, beyond 30 days

Prices in US dollars; the App Store shows yours.

Nattra collects nothing.

No account, no analytics, no server. Your sleep stays on your iPhone, and Apple Health is read for sleep only.

Read the privacy policy