The site was most popular between 2012 and 2014, often used by owners of feature phones (like Nokia S40/Symbian devices) and early Android phones to bypass the lack of native "offline" features in the YouTube app at that time. Functionality:
Based on recent security scans and user reports across Reddit and tech forums, here is the current status: yaaya mobi youtube downloader extra quality
In the case of , user reports suggest it attempted #1—direct download of available DASH (Dynamic Adaptive Streaming over HTTP) streams. DASH splits YouTube videos into separate audio and video streams. An "extra quality" downloader would merge the best video stream (e.g., 1080p) with the best audio stream (e.g., 192kbps AAC or Opus). The site was most popular between 2012 and