I primarily developed this to block spoilers about Marvel movies in social media apps before I watch the movie on theatres. But it works based on keywords, so it is not specific to movie spoilers.
I felt that social media apps spoils too much about the movies I want to watch and I wanted to block/avoid those based on keywords. And I found an amazing chrome extension (https://chrome.google.com/webstore/detail/spoiler-protection...) that does exactly this, by blocking content from user-defined keywords.
It worked well, but I needed something for my mobile(Android) too since I use Reddit and Facebook exclusively on my mobile device and YouTube occasionally. After extensive research, I didn't find any existing apps that do this for me. So I developed one.
There is a demo video linked in the repo where I show how to use the app and there is also a link to the APK.
It uses accessibility service, so the blocking will not be instant as the app blocks the content only after that content is displayed on the screen. This means you will see the actual content for a split second before this app blocks that content, but it is good enough for me.
The app currently blocks content only from Relay for Reddit, YouTube, Facebook, and WhatsApp.
