Heyday’s security and privacy stance is clear:

• We make money by selling subscriptions. We never sell your data or run ads.
• No one at Heyday can see your data. It is encrypted and is only seen by others if you choose to share it.
  • We encrypt user data using AES-128 in CBC mode + HMAC-SHA-256 with a random IV.
• Heyday has completed exhaustive security reviews conducted by Zoom and Google.
• You can delete your data at any time. Heyday deletes your data automatically when your free trial ends or 14 days after your subscription ends.
• Security is a mandatory consideration for both our application code and data handling.

Here are our more detailed privacy policy and terms of service.

Here are the security principles that guide our development process.