The best alternatives to Black Highlighter are MagicPad, Cloak It - Secret Messages, and NoteRiot. If these 3 options don't work for you, we've listed a few more alternatives below.
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WorkOS— Integrate enterprise features - SSO, SCIM, RBAC, FGA - in minutes
It is everyone's right to privacy. MagicPad adds to your security and privacy arsenal for free! A simple and private, offline encryption suite. 0 collected data and 100% open-source. Steganography optional :) Mobile friendly.
NoteRiot is the easy to use note taking app. Notes are accessible everywhere, easily searchable so you always find what you need. Always private, always secure.
Encrypt and decrypt images, and share them securely and anonymously. Pikkano is an application on which you will be able to send, share and receive encrypt images in a private and secure way. Once you have encrypted the image using Pikkano App, this won’t be kept in any cloud or application.