Cozi Not Syncing? Why Lists and Events Go Missing in 2026 (and How to Fix It)

You added the orthodontist appointment on Tuesday. It's Thursday, and your husband is asking when the orthodontist appointment is, because it's not on his phone. Or you're standing in the grocery store and half the list you built last night is just... gone.

So you searched "Cozi not syncing" and landed here. Two things up front: you're not imagining it, and it's probably not something you set up wrong.

You're not the only one

Starting in late 2025 and picking up through spring 2026, Cozi's Google Play reviews filled up with the same handful of problems, often from families who had used the app happily for years:

• List items disappearing - things you added simply vanish later
• Events that don't save, or save on your phone but never show up for anyone else in the family
• Blank widgets - the home screen widget stops showing anything at all
• Slow lists - a long pause after every single item you type
• Random logouts, sometimes followed by the app refusing to accept a password you know is right

One reviewer put it plainly in May 2026: "other family members will add things but no one else can see them." Another, a multi-year paid subscriber, wrote in June that the app "frequently does not save new events." Several reviews point at specific app updates from early 2026 as the moment things broke.

To be fair: Cozi still holds a 4.7-star average across more than a hundred thousand ratings, and plenty of families aren't seeing any of this. But if you are, it's real, it's recent, and there are things worth trying before you give up on it.

The 10-minute fix checklist

Do these in order. The first one matters most, because it tells you whether your data still exists.

1. Open my.cozi.com in a browser and sign in. This is Cozi's web version, and reviewers consistently report it working when the app doesn't. If your missing events and list items show up here, your data is safe - the app is the problem, not your account.
2. Update the app on every phone in the family. If a bad update caused the problem, a newer one may have fixed it. Check the App Store or Play Store for a pending Cozi update rather than assuming auto-update handled it.
3. Force close and reopen the app on every device. Stale sessions are a common reason one phone shows things another doesn't.
4. Confirm everyone is in the same account. Cozi families share one account. If your partner ever created their own account by accident, you've been writing to two different calendars. In the app, check that Settings shows the same family email for both of you.
5. Remove and re-add the widget if yours went blank. Widgets cache data separately from the app and sometimes need a fresh start.
6. Log out and back in - carefully. This fixes sync for some people, but recent reviews describe getting stuck at login afterward with a password that won't take. Before you log out, make sure you actually know the family password (not just Face ID), and be ready to use the password reset email if it balks.
7. Email Cozi support with specifics: which device, which update, what was added, what disappeared, and when. Cozi does respond to reviews and tickets, and a dated paper trail helps if you lose something important later.

How to tell if your data is actually gone

The web check in step 1 is the divider.

If events and list items appear on my.cozi.com but not in the app, nothing is lost. You can limp along on the mobile website while Cozi works through the app bugs - more than one reviewer says that's exactly what they're doing.

If items are missing from the web version too, they most likely didn't survive, and no amount of reinstalling brings them back. Anything you re-add from memory, add it on the web where saving seems more dependable right now.

The uncomfortable question

A shared family calendar has exactly one job: everyone looks at it and sees the same thing. The moment your partner stops trusting it - because the game time he checked wasn't there, twice - he goes back to asking you. And then you're the family's single source of truth again, which is the exact job you got the app to escape.

You can forgive an app a bad week. What the reviews describe is closer to a bad six months, with paying subscribers saying they're canceling after years. Only you know where your line is. But it's worth knowing that leaving doesn't mean starting over from a blank calendar.

If you're done fighting it

Sense is a family organizer built by parents, and moving your calendar over takes about two minutes: Cozi publishes a shared calendar URL (on their Gold plan), and Sense imports it as your own editable events - a real copy, not a mirror that stays tied to Cozi. Here's the step-by-step: how to import your Cozi calendar into Sense. If you want the full picture of what can leave Cozi and what can't, we wrote up how to export your Cozi calendar, including lists.

On free Cozi with no share URL? You don't need one. Sense's main way of filling a calendar is reading the emails that filled Cozi's in the first place - forward the school newsletter, the practice schedule, the camp confirmation, and the dates land on your family calendar without anyone typing them in. A handful of forwarded emails rebuilds most of the month.

And the things that pushed you to search for this post in the first place: in Sense, your shared lists and events sync for the whole family, there are no ads, and the calendar isn't capped at 30 days on the free plan.

If the checklist fixed it

Genuinely: great. Keep the my.cozi.com bookmark around as your backstop, and add anything important on the web until a few app updates go by without incident.

And if it breaks again after the next update, you'll know it wasn't you, and you'll know the way out: your events can come with you. If you're weighing options, we've also written about what long-time Cozi users are switching to in 2026 and Cozi's 30-day calendar limit on the free plan.