Disclaimer: I'm the creator of Fritter
Could you say a little about how Fritter works without an API key? Is it just because it isn't designed for posting or interacting with Twitter, just reading/viewing it? Why/how does Fritter still work when Twitterrific etc. are dead? Are you just, like, scraping the website? Isn't Twitter making it harder to read tweets from the open web when you're not logged in?
But none of it holds a candle to TweetBot or Twitterific.
no connection / satisfied user
[0] https://apps.apple.com/us/app/userscripts/id1463298887
[1] https://github.com/insin/tweak-new-twitter#tweak-new-twitter