This is something I started building a while back and finally launched yesterday after seeing Elon’s tweet about freeing up Twitter handles.
https://twitter.com/elonmusk/status/1601124219009409024
It works for Twitter, Instagram, Reddit, and Snapchat.
It did have Facebook, YouTube, and TikTok but they recently introduced more restrictions for automated checks.
Show HN: Get notified when a Twitter handle becomes available
available.fyi