Rhythm vs Huckleberry
I built Rhythm after using other trackers with my own son, so this is a builder's honest comparison, not a teardown. Huckleberry is a good app with a big head start. If you want a native iPhone app, a home-screen widget, an Apple Watch face, or paid one-on-one sleep consultations, Huckleberry does those; Rhythm does not.
| Huckleberry | Rhythm | |
|---|---|---|
| Sleep / wake predictions | SweetSpot, paid only | Included on the free tier, no subscription |
| How predictions work | From their models of how babies sleep, mixed with your baby, computed on their servers | Pattern matching against your baby's own days, on your phone |
| Works offline | Logging works offline | Yes - logging and predictions both run on-device |
| Account required | Yes | No - open the page and start; an account is only for sync |
| Install | App Store / Play Store download | Open in any browser, optionally add to home screen |
| Price | $15/mo, or $10/mo billed yearly | Free on one device; $5/mo, or $45/year, per household |
| Your data | On their servers | On your device first; synced only if you choose to |
| Bring your history | n/a | Import your Huckleberry export directly |
Where Huckleberry is the better choice
Choose Huckleberry if a true native app matters to you - widgets, an Apple Watch companion, voice logging, or an AI assistant. If you want paid sleep consultations or structured sleep programs alongside tracking, Huckleberry offers those and I do not.
Where Rhythm is different
Predictions without a subscription, and without "AI".
Rhythm reads your baby's actual sleep history, finds the days that looked like today, and shows the wake window that usually followed. No model trained on other people's babies, and nothing to call home to, so the predictions keep working on a plane, in a basement, or on hospital wifi that pretends to exist. Every number shows how many days it learned from. If it looks wrong, you override it, or ignore it.
One flat price for the whole household.
The full app is free on one device. Sync, partner invites, and backup are $5/month per household - your partner, a grandparent, and a nanny are all one price. 14-day free trial, cancel anytime, and your local data stays put if you stop.
Your baby's data is yours.
Everything runs on your device by default. If you sync, a copy lives on my servers so your other devices can read it. It's encrypted in transit, with encrypted offsite backups. No ads, no tracking pixels, no selling data. You can export your data anytime (JSON).
Switching from Huckleberry
You do not have to start over. Export your data from Huckleberry (it comes through as an email), then in Rhythm open Settings, Import, Huckleberry, and upload the file. Your feeds, sleep, and diapers come across so your history and your patterns move with you.
No account, no install, nothing to uninstall if it is not for you.
Try Rhythm in your browser