It can be used to display multiple alerts of your choice. In my case, I've been using it to show WhatsApp notifications and the currently playing track on Spotify.
It relies on the Tasker application for Android, which reads notifications from both applications and sends a GET request to the ESP32 with the message. That's all!
- ssd1306 library: https://github.com/squix78/esp8266-oled-ssd1306. You can install it from Arduino IDE, search for ssd1306 by thing pulse.