I have indie developed a Matrix iOS client called Nil.
It not only comes with basic features like encryption, rich notifications. But also with:
🐈⬛ Tenor GIF
✨ Local AI (Phi or Llama) to chat with, ask for message summaries, and reply suggestions
🗂️ Message room folders
☕️ Customizable reaction emojis
⌚️Upcoming WatchOS, MacOS, VisionOS app