EstreluBaby Sleep Tracker App with Nap Prediction
Estrelu is a baby sleep tracker app with nap prediction for babies and toddlers up to age three. You log sleep with one tap or a swipe, and it forecasts the next nap as a time range with a confidence level. It runs in your browser, works offline, needs no app store and has no ads.
The question every parent asks at 10 a.m.
Your baby woke at 7. Is it too early for a nap, or are you about to miss the window and face an overtired meltdown? You do the math in your head, check the clock, and still guess. Estrelu does that math for you and shows a window you can plan around, along with how sure it is.
How the sleep tracker and nap prediction work
- Log sleep in a second. Tap "Start sleep" during the day, or swipe up on the dark night screen. A short vibration confirms it.
- See the next sleep window. The forecast appears as a range with a confidence level: low, medium or high. Tap it to see what it was built from.
- Let it learn your baby. In the first days, the forecast uses age-based wake windows. After a few days of records, it adjusts to your baby.
- Plan the day. "Day plan and 'what if'" shows naps and bedtime for today and tomorrow. Move a nap and see how the rest of the day shifts.
- Get a heads-up. Turn on a notification 15 minutes before the window and when it opens. Quiet hours keep the night silent.
Ready to drop a nap? The "Fewer naps" helper looks at your baby's own records. For time changes and trips, "Clock change & travel" builds a step-by-step plan to shift sleep.
A typical sleep app vs Estrelu
| Usually | In Estrelu |
|---|---|
| One exact nap time with no explanation | A time range with a confidence level you can tap to see why |
| Same schedule for every baby of an age | Starts from age ranges, then adjusts to your baby's records |
| Sick days and teething skew the predictions | Off days are left out of learning and widen the range |
| Needs a download and an internet connection | Runs in your browser and works offline |
| Ads or locked premium features | No ads, every feature in every plan |
What it's based on and what it doesn't do
The starting wake windows come from Estrelu's age table. For example, about 1 hour 15 minutes to 1 hour 55 minutes at 3 months, 2 hours to 2 hours 45 minutes at 6 to 8 months, and 3 hours to 3 hours 45 minutes at 12 to 14 months. You can check your baby's range with the wake window calculator.
For total sleep, the American Academy of Sleep Medicine recommends 12 to 16 hours per 24 hours (including naps) for babies 4 to 12 months and 11 to 14 hours for ages 1 to 2 (AASM). It makes no recommendation for babies under 4 months. The AAP notes that newborns often sleep about 16 to 17 hours a day (AAP).
What Estrelu does not do:
- It does not promise your baby will fall asleep in the window. The forecast is a guide, not a promise.
- It does not prescribe a sleep training method or judge your baby's sleep as good or bad.
- It does not connect to cameras, wearables or smart cribs.
Always follow safe sleep guidance: the AAP advises placing your baby on their back on a firm, flat surface, with no pillows, blankets, bumpers or toys in the sleep space (AAP).
Each baby's sleepy signals might be a little different. Common ones include yawning, rubbing their eyes, blinking more often or staring off.
If a rough week is throwing things off, mark it as an off day for teething or a growth spurt. When your baby is ready to drop a nap, read our guide to the 2-to-1 nap transition.
When to call your pediatrician
Talk to your baby's doctor if your baby snores loudly, has pauses in breathing during sleep, is very hard to wake, or if sleep changes suddenly along with fever or other signs of illness. Also reach out if you are exhausted and struggling to cope.
Estrelu is not a medical device. It does not diagnose, calculate doses or replace your pediatrician.
How to start
- Open Estrelu in your phone browser. You don't need the App Store or Google Play.
- Enter your email and the code we send you. There is no password.
- Add Estrelu to your home screen: on Android tap "Install", on iPhone tap "Share" and "Add to Home Screen".
After the first visit the app works offline.
One subscription per family
The first 5 days are free and we don't ask for a card. After that: $4.99 a month, $44.99 a year (instead of $59.88, 25% off), or $79 once for lifetime. Every plan includes every feature, with any number of adults and up to four babies. Paying in USDT is 10% cheaper.
Your data
Your logs are saved on your phone and synced through our server with the whole family. You can export them to JSON or CSV and delete them in settings. Symptom photos stay on your phone only. Estrelu has no ads and no third-party trackers. Privacy policy
Frequently asked questions
- How does Estrelu predict my baby's next nap?
- At first it uses age-based wake window ranges. After a few days of logging, it adjusts to your own baby's records. Tap the forecast to see what it was built from.
- Why is the nap prediction a range and not an exact time?
- Babies are not clocks. A range with a low, medium or high confidence level is a more honest answer than a single minute, and it shows you how sure the forecast is.
- Does the sleep tracker work offline?
- Yes. After the first visit, logging, the forecast, the night screen and sounds all work without internet.
- Will a sick day or teething throw off the forecast?
- You can mark an off day for illness, teething, a growth spurt or a shot. The forecast does not learn from those days and shows a wider range until the mark ends after 14 days.
- Can I get a reminder before the next nap?
- Yes. Estrelu can notify you 15 minutes before the window and when the window opens, with quiet hours at night.
- Is Estrelu a sleep training program?
- No. It records sleep and forecasts windows. It does not prescribe a sleep training method or replace advice from your pediatrician.
Sources
- AASM 2016: Recommended Amount of Sleep for Pediatric Populations jcsm.aasm.org
- AAP HealthyChildren: Getting Your Baby to Sleep healthychildren.org
- AAP HealthyChildren: A Parent's Guide to Safe Sleep healthychildren.org
- Cleveland Clinic: What Are Baby Wake Windows? And How Long Should They Be? health.clevelandclinic.org
Try Estrelu
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Read next
- Wake window calculatorEnter your baby's birth date and wake-up time to see when the next nap may fit. Plus a wake window chart by age, newborn to 3, and where the numbers come from.
- Leap and Teething Tracker for Fussy WeeksMark teething, illness, leaps and shots as off days so the sleep forecast stays honest, and see when a fussy week may come. Works offline in your browser.
- White Noise App for Baby That Works OfflineSeven white noise sounds with a timer that play without internet, plus a cry timer, colic notes, a bedtime routine and a night-light clock. No ads.
- The 2 to 1 nap transition: signs, timing and a 2-week planWhen do toddlers drop from two naps to one? Signs your child is ready, a gentle two-week plan, what to do about bedtime, and when to talk to your pediatrician.