We make one of these apps. NapNap Baby is our product, so treat this as an informed but interested opinion. The criteria below are the ones we would apply to any tracker, including ours.
Baby trackers are used in the worst possible conditions: one-handed, in the dark, half asleep, often with no signal. That context, more than the feature list, is what should decide your choice.
The seven things that actually matter
1. Does it work with no signal?
This is the one people discover too late. Plenty of trackers are thin clients over an API — lose connection in a basement nursery, a hospital, or a plane, and you cannot log a feed. A genuinely offline-first app writes to local storage first and syncs later, which means it is never unavailable and never slow. Test this before you commit: put the phone in airplane mode and try to start a timer.
2. Can both parents see the same data, live?
Two exhausted people need one source of truth. The bar is not just “shared account” — it is whether a sleep timer started on one phone appears running on the other. Without that, you get double-logging and the 4am argument about whether she was fed.
3. Are the predictions real, or just an age chart?
Many apps advertise predictions that are simply a lookup of the average wake window for the baby’s age. That is a chart with extra steps — you can get the same from our free wake windows page. A genuine prediction uses your baby’s logged history, and ideally accounts for the fact that wake windows lengthen across the day rather than using one flat average. Ask: does the prediction change as I log more?
4. How many taps is a log?
If logging a nap takes six taps and two dropdowns, you will stop doing it within a fortnight, and an abandoned tracker is worth nothing. One tap to start, one to stop, with details optional afterwards, is the standard to hold out for.
5. Can you get your data out?
Export to CSV should be table stakes. Data you cannot export is data you have lent to a company. Equally, check whether you can import: switching trackers with a year of history is otherwise painful enough that people stay on apps they dislike.
6. What is the pricing model, and what is behind the wall?
Look specifically at whether basic logging is free. If you cannot record a feed without paying, the app has made tracking — the core function — into the upsell. Reports, predictions and charts being premium is normal and reasonable.
7. What happens to your family’s data?
This is health data about a child. Read the privacy policy for two things: whether data is sold or shared for marketing, and whether you can delete your account and data from inside the app. A guest mode that never sends anything to a server is a good sign that the company has thought about it.
How NapNap answers each one
| Criterion | NapNap Baby |
|---|---|
| Offline | Fully offline-first. Every write goes to on-device storage first and syncs when a connection returns. |
| Two parents | Shared account or partner invite. A running sleep timer appears live on the other parent’s phone. |
| Predictions | Built from your baby’s own logged wake windows, using position-specific windows (the first of the day is shorter, the pre-bedtime one longer), blended with age defaults until there is enough data. |
| Speed | One tap to start a nap from the home screen; details optional afterwards. |
| Your data | CSV export, and CSV import from other trackers — import is free, with no NapNap Pro purchase required. |
| Pricing | 30 days of full access free, no card and no account. Logging stays available afterwards; reports, predictions and reminders need NapNap Pro, which is sold as an auto-renewing subscription or as a one-time lifetime purchase. |
| Privacy | Guest mode keeps everything on-device with no server calls. In-app account deletion. Data is not sold or shared for marketing. |
| Also tracks | Bottle, breast and solids, diapers, pumping, growth against WHO percentile curves, temperature, activities, and day-by-day sleep training plans. |
| Languages | 22, including Romanian, Spanish, German, Polish, Turkish and Korean. |
Test it in airplane mode before you commit. NapNap is free for 30 days with no card and no account — and if you already track somewhere else, importing your history is free too.
Get the app free →Free to try · No account needed · Works offline
Do you even need an app?
Honestly, not always. A paper log on the fridge works fine if you are tracking one thing for a short period. Apps earn their place when you want the pattern rather than the entries — predicting the next nap, spotting that bedtime has drifted 40 minutes later over a fortnight, or handing a pediatrician a clear picture at a check-up. If you only need to remember which side you fed from last, a note on your phone is enough.
Before you install anything
Most of what a tracker tells you, you can get for free from the guides on this site: how much sleep your baby needs, wake windows by age, and sample schedules. Read those first. If after a week you find you are trying to hold all of it in your head at 3am, that is the point at which an app helps.
Common questions
What is the best free baby sleep tracker?
The right test is what is free rather than which app is best overall. Check that basic logging of sleep and feeds is free rather than trial-limited, that data export is included, and that the app works offline. NapNap gives 30 days of full access with no card and no account, and keeps logging available afterwards.
Do baby sleep trackers actually work?
They are accurate in the sense that they record what you log. The useful part is the pattern over time: spotting that bedtime has drifted later, that a nap is consistently short, or that wake windows have outgrown the schedule. Prediction quality varies a lot between apps.
Can I move my data from another baby tracker?
Look for CSV import. Many trackers export CSV and some apps, including NapNap, can import that format directly, which avoids losing months of history when you switch. NapNap does not charge for import.
Can both parents use the same baby tracker account?
In good apps, yes, and it should sync live rather than only on refresh. The test worth applying is whether a sleep timer started on one phone shows as running on the other within a few seconds.
Is it safe to put my baby’s data in an app?
Read the privacy policy for two specific things: whether data is sold or shared with third parties for marketing, and whether you can delete your account and data from inside the app. A local-only guest mode is a good sign that the company has taken the question seriously.