Caasi
Bottle tracker: times and amounts
Prefilled with the last amount given. One tap is enough, and the time stays editable.
New Baby's first foods
Caasi: Baby & milk tracking, together
Bottles, sleep, diapers, first foods, and your breast milk stash tracked batch by batch. Everything you log shows up right away on the other parent's phone.
- Both parents, in real time
- Hosted in Europe, zero ads
- Export your data in one tap
Your breast milk stash
Your pumped milk, never wasted
Every pumping session becomes a numbered batch. You write the number on the bag, and Caasi tracks freshness, in the fridge and in the freezer.
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Numbered batches
#46, #66, #68… the number in the app is the one written on the bag. No more forgotten bag at the back of the freezer.
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Freshness that updates itself
A batch comes out of the freezer? Its use-by time is recalculated on its own. Caasi tells you which one to use first.
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Bottles draw from the stash
3 oz given from batch #66: the stash updates, and the other parent sees it without having to ask.
New · Starting solids
Baby's first spoonfuls, logged by both of you
The starting-solids log, kept by both parents: what baby has tasted, what they liked, and the allergens already introduced.
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Over 100 illustrated foods
From carrots to yogurt, with the amount if you like. A food is missing? Add it, for both phones.
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What they liked, what to offer again
A rating at every meal, and the list of refused foods so you remember to offer them again.
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Allergens, week after week
Egg, peanut, gluten: see when each one was last offered, with no imposed schedule.
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The list for daycare
Foods tried, allergens and reactions, sent in one tap to daycare or the nanny.
In one tap
All of baby's day, without a second thought
Breastfeeding tracker, side by side
One side at a time, with a timer that keeps running even on the lock screen.
Pumping log and breast milk stash
Each session is timed, then split into batches that go straight into the stash.
Baby sleep tracker: naps and nights
Started in one tap, with a start time you can adjust when you only remember later.
Diaper tracker
Pee, poop or both: logged in two taps.
Growth tracking: weight and height
Your baby's own curve, never a reference chart.
Baby stats and history
The day hour by hour, and yesterday's recap to share with family.
Reminders shared by both parents
Vitamin D, medicine: checked off by one of you, gone for the other.
One family, two phones
No more asking “when did baby last eat?”
One of you logs, the other sees it. Nothing to text, no spreadsheet to keep in sync: the family shares a single log, in real time.
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A nap started on one phone ends on the other
Ongoing sessions are shared: whoever gets home sees that baby has been asleep for 42 minutes.
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Every entry shows who logged it
You know who did what, with no counters and no “who does more” stats. It's not a contest.
No judgment
Your baby is only ever compared to your baby
No percentiles, no reference charts, no “your baby should”. Caasi shows what happened, not what should have happened.
- Data hosted in Europe
- Zero ads, zero data selling
- Full JSON export, in one tap
- Permanent account deletion
Soon
Caasi is coming to Android
The app is available on iPhone today. Leave your email: you'll get one message the day Android launches, and nothing else.
One email, at launch. No newsletter, no sharing with third parties.
FAQ
Questions parents ask us
What is Caasi?
Caasi is an iPhone baby tracker built for both parents, available in English and French. It logs bottles, breastfeeding, pumping and your breast milk stash, sleep, diapers, starting-solids meals, weight and height. Every entry syncs in real time between your two phones, and the data is hosted in Europe.
Does it work if I'm parenting solo?
Yes. A family works with one person, and you can invite a co-parent later with a code. No imposed roles: two moms, two dads, a single parent. Caasi only asks for a first name.
How does the breast milk stash work?
Every pumping session becomes a numbered batch: you write the number on the bag, and Caasi tracks its freshness in the fridge and in the freezer. A thawed batch gets its use-by time recalculated, and a bottle drawn from the stash updates the total on both phones.
Does Caasi track starting solids?
Yes. The Meals tab logs every meal with its foods (over 100, illustrated), the amount if you like, how baby liked it and any reactions. The allergens you introduce are tracked week after week, and the list of foods tried can be shared with daycare.
Is my data sold or analyzed?
Never sold. No ads, no tracking across apps. Sentry detects technical errors and PostHog measures how the app is used through anonymous statistics, without anything you log; you can turn this off in Settings. Your data is hosted in Europe and only the members of your family can access it. Full JSON export and permanent account deletion, each one tap away in Settings.
Does Caasi compare my baby to growth charts?
Never. No percentiles, no medical norms, no diagnosis. Your baby is only ever compared to your baby.
Ounces or milliliters?
Both. By default Caasi follows your iPhone's region: ounces, pounds and inches in the US. In Settings, under Language and units, you can switch everything at once, or pick a unit for each measurement: milk, weight, height and meals.
Does Caasi work offline?
Yes. Every entry is saved on your phone first, then synced as soon as you're back online. You can log a bottle in the middle of the night with no signal: the other parent will see it afterward.
Can I track more than one child?
One child for now. Tracking several children is planned, but isn't available yet.
When is the Android version coming?
No date announced yet. Leave your email in the Android section above: you'll be notified on launch day, in a single message.
From the blog
Guides and comparisons
Apps
The best baby tracker apps in 2026, compared
Caasi, Huckleberry, Baby Tracker, Sprout, Nara, ParentLove: 10 baby tracker apps compared on sharing between parents, milk stash and starting solids.
October 20, 2026
Apps
Baby tracker app for both parents: how to share one log in real time
Bottles, nursing, naps, diapers: what a baby tracker app for both parents should do, so you both see the same thing at the same moment.
October 20, 2026
Breast milk
Breast milk storage guidelines: how long pumped milk lasts at room temperature, in the fridge and in the freezer
Pumped breast milk keeps up to 4 hours at room temperature, 4 days in the fridge and 6 to 12 months in the freezer. The CDC guidelines, situation by situation.
October 20, 2026
Breast milk
How much breast milk to store before going back to work
When to start pumping, how much milk to freeze, how to store it, and your right to pump at work under the PUMP Act and the FLSA.
October 20, 2026