Privacy Policy

Last updated September 2026.

Fourth (“we,” “us”) provides a website and mobile app to support women and their care circles during the postpartum period. This page explains what we collect, why, and how to reach us about it.

What we collect

If you join the waitlist: your name, email, role (mom, partner, family/friend, doula, or “just want to help”), and an optional due date or baby’s birthday.

If you create or use a registry: the registry owner’s name and any optional details she adds (due date, allergies, meal preferences, drop-off notes). If you claim an item on someone’s registry, we collect your name and email so we can send a confirmation and reminders about what you signed up for.

If you use the support chat: the chat is anonymous and doesn’t require an account. We assign a random session identifier stored in your browser to support the “connect with another mom” feature and to detect if you’re an active participant for pairing purposes. Messages you send to the AI companion are processed by Anthropic (the maker of Claude) to generate a response; if you choose to connect anonymously with another visitor, those messages are stored so both of you can see the conversation, and so we can review flagged messages for safety.

If you use the Fourth mobile app: we collect your email (for passwordless sign-in), your role (mom or partner/family), and if you’re a mom, the check-ins you submit (mood, sleep, and any notes you write) and the members of your care circle. Partners and family you invite see check-in data according to the visibility you control.

What we don’t do

We don’t sell your data to advertisers, and we don’t use it for ad targeting. We don’t run ads on Fourth at all. Safety-critical information — crisis hotline numbers and postpartum psychosis warning signs — is never behind a login or paywall.

Who we share data with

We use a small number of service providers to run Fourth: Supabase (database and authentication), Resend (email delivery), Anthropic (processes support chat messages to generate responses), and Vercel (hosting). These providers process data on our behalf under their own privacy and security commitments — we don’t sell or share your data with anyone else, and never for advertising.

Data retention and deletion

You can ask us to delete your data at any time by emailing hello@fourthapp.co. Anonymous chat sessions are not tied to an identity we can look up unless you also used the registry or app with an email address.

Not a substitute for professional care

Fourth’s support chat and educational content are for information and emotional support only — they are not a medical provider, therapist, or crisis service, and don’t diagnose or treat any condition. If you’re in crisis, call or text 988 (Suicide & Crisis Lifeline) or the National Maternal Mental Health Hotline at 1-833-852-6262, both free and available 24/7.

Children

Fourth is intended for adults and is not directed at children under 13. We don’t knowingly collect data from children.

Changes to this policy

We’ll update this page if what we collect or how we use it changes, and update the date at the top.

Contact

Questions about this policy or your data: hello@fourthapp.co.