What are some alternatives?
When comparing Boop and sup3rS3cretMes5age, you can also consider the following products
Redacted - Easily blur/pixelate/black out parts of an image
Digify for Gmail - Track, unsend & self-destruct your Gmail attachments.
Blur - Blur is a software application available for both Google Chrome and your smartphone. It's developed by Abine, an online privacy company trusted by more than twenty million people. Read more about Blur.
Confidential CC - Send self-destructing email without leaving a trace
BURN.link - Send secure, encrypted, self-destructing messages
Protect IID - Protect your privacy with single-use email addresses