A Wee introduction into this software in simple terms is like Ahrefs or Semrush but instead of you having to pay $99 per month you can use their services at $29 which is a very reasonable amount of money to pay since in general for Semrush or Ahrefs majority of people not use for half of the things it does since in normal cases SEO just care about keywords or rankings or traffic or maybe metric or backlinks all other parts of the software does not matter that much overall.
Database of this software in some cases they could have more rankings or backlinks data than Semrush or Ahrefs but it is a younger service than the other two companies. but they do make it bigger every month.
Semrush only provides data for Google and Baidu China but Se Ranking provides data for Google,Yahoo,Bing,Yadex and also Youtube.
The lowest plan allows you add up to 10 websites with a total of 5 different locations and between 250 to 750% keywords per account in total but with Semrush it only allows 5 websites with a extra $70 for there price compared to Re Ranking.
More will be added into this article very soon !