Tweetbot - Sync your timeline across your iPhone, iPad, and Mac. Mute tweets by user, hashtag, tweet source, or keywords (including regex). 3rd Party support for image, video, read later, and timeline sync services.
Twidere - Tired of seeing ads and promotions in your timeline, being disrupted by tweets from bots and people...
Twitterrific - Twitterific is an app that offers several functions and fun features for your Twitter account.
Hyperspace Mastodon client - Hyperspace offers a clean, fast and responsive client for the Mastodon social network
X (Twitter) - Connect with your friends and other fascinating people. Get in-the-moment updates on the things that interest you. And watch events unfold, in real time, from every angle.
Pinafore - An alternative web client for Mastodon, focused on speed and simplicity.