Superhuman is Spying on You

Superhuman is a surveillance tool that intentionally violates privacy by notifying senders every time their emails have been viewed by recipients. I would never trust this company. Only way to make sure your own privacy isn’t violated is to disable images in your own email app.

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Superhuman never asks the person on the other end if they are OK with sending a read receipt (complete with timestamp and geolocation).

Source: Superhuman is Spying on You » Mike Industries