How to Share Your Cycle with a Partner (Securely and Privately)
Most period trackers share your health data with their servers when you sync with a partner. Vela's encrypted partner sharing keeps your cycle data end-to-end encrypted — even from Vela itself.
The Problem with Most Cycle Sharing Features
You want to share your cycle data with your partner — maybe you’re trying to conceive, avoiding pregnancy, or just want them to understand your moods and energy. So you enable “partner sync” in your period tracker app.
What you probably don’t realize: your intimate health data is now on someone else’s server. Your partner’s phone receives your cycle predictions, symptom logs, and fertility windows through the app company’s cloud infrastructure. The data isn’t private between the two of you — it’s routed through servers that the company controls, stores, and could theoretically access.
This is how most period tracker partner features work. Flo, Clue, Ovia — they all use server-side relay for partner sharing. Your health data travels to their cloud, gets processed, and gets delivered to your partner’s device. The company technically can read it. In some cases, it gets used for algorithm training or shared with “partners.” You agreed to this when you accepted the terms of service.
End-to-End Encryption: How Vela Syncs Data with Your Partner
Vela takes a different approach. When you enable partner sharing, your cycle data is encrypted on your device before it ever leaves your phone. The encryption key never leaves your possession. When your partner’s phone receives the sync, it can decrypt the data locally — but Vela’s servers, and anyone else who might intercept the data in transit, see only encrypted blobs.
This is called end-to-end encryption (E2EE). It’s the same technique used by Signal, iMessage, and the best privacy-focused messaging apps. Your actual health information is unreadable to anyone except you and your partner.
Here’s what this means in practice:
- Vela’s servers cannot read your partner-shared cycle data
- There’s no plaintext health data sitting in anyone’s cloud
- Even in a data breach, your partner-sharing data remains private
- You can revoke partner access at any time without data lingering
Setting Up Partner Mode in Vela
Vela’s partner sharing is built on the same encrypted relay that backs your cloud backup. To enable it:
- Open Vela and go to Settings
- Find “Partner Sharing” or “Share with Partner”
- Your partner installs Vela and creates an account (or signs in)
- You send them a partner invite from within the app
- They accept — from this point on, your cycle data syncs with end-to-end encryption
The key detail: the invite link or code only establishes the encrypted channel. Your actual data never passes through Vela’s servers in a decryptable form. The encryption happens client-side, on your device, before anything is transmitted.
You can share selectively — your full cycle history, or just current cycle phase and predictions. You control exactly what your partner sees.
Why This Matters for Trust
Partner sharing of health data is intimate by nature. You’re not just sharing your calendar — you’re sharing your fertility windows, your symptom patterns, your sexual activity logs, your hormonal moods. That information in the wrong context could be harmful.
End-to-end encryption for partner sharing isn’t just a technical feature — it’s a trust feature. It means you can share your cycle data with your partner without also sharing it with a tech company, advertisers, or anyone else who might intercept the connection.
With Vela, what you share with your partner stays with your partner.