Approach Zero is described as '“Math-aware” means you can add math expression(s) as some of your keywords to have search engine help you find similar expressions and return those documents/topics that you may find relevant to your query. In short, a typical search engine plus math search' and is an website in the online services category. There are 2 alternatives to Approach Zero, not only websites but also apps for. The best Approach Zero alternative is SearchOnMath, which is free.
SearchOnMath is a search engine specialized in formulas and text from several domains with math content, including arXiv, Stack Exchange, Wikipedia, and others.
SearchOnMath is the most popular Web-based alternative to Approach Zero.
SearchOnMath is the most popular free alternative to Approach Zero.
Uniquation is designed to search for mathematical information on the Internet. To find information about some mathematical object you should enter its representation in TeX format and press ‘Search’.
