Made for a household rather than one person. Some hold what you type into them, some try to do more.
Built around one person, and allowed to act on their behalf. That is a different job, and a different set of risks.
Not alternatives. Things Hermo sits alongside rather than replaces.
The short version
A shared organiser is only as current as the last person who entered something. Hermo reads the family Gmail on read-only OAuth and asks you about what it finds, so the school email at 7am does not depend on anyone remembering.
The second parent is the one who quietly stops opening the app. Hermo lives in WhatsApp, so there is nothing new to download, learn or be nagged about.
Familypedia is one household knowledge base, and either of you can ask it. An assistant built around one person answers the person who set it up.
Which of these is the closest alternative to Hermo?
None of them do the same job. Cozi and FamilyWall are shared calendars and lists that hold what you type into them. Ohai is a family assistant too, but it lives in its own app and needs emails forwarded to it. Meta Muse is a personal agent, built around one person and allowed to act on their behalf. Hermo reads the family Gmail on read-only OAuth, asks you about what it finds on WhatsApp, and keeps one set of household facts both parents can query.
My family app is shutting down. What should I do first?
Check whether it has an export before you plan around one. Maple and Milo do not, so screenshots of your lists and recipes, or the text copied out, are the realistic route. Anything that was synced to Google, Apple or Outlook already lives in that calendar and survives on its own. There is a step by step guide for moving your family admin across, and one each for Maple and Milo.
Does Hermo replace my calendar?
No. Hermo populates Google Calendar rather than replacing it, which is also why it sits alongside a Skylight screen instead of competing with one.