Open Access Button was a service for researchers that found legal, freely accessible copies of scholarly articles and helped request papers from...
Pros
- Focused specifically on locating legal open-access copies
- Could request articles directly from authors when no free copy was found
- Supported DOI, title, and browser-based searches
Cons
- Retired and no longer available for active use
- Coverage depended on repository deposits and author responses
- Had less comprehensive scholarly discovery than Google Scholar or Semantic Scholar