Ahrefs is very popular tools and used a lot by SEO community for its back link profile feature the most. I assume that you already know what is Ahrefs group buy tool. If you don’t know then let me quickly go over this term; group buy means shared account. This is how it works you buy these premium tools at a very low cost and these tools under group buy option lack some features like you can not add your website to Ahrefs or any other tools, that is only feature I think is useful in if you go for private account that will cost at least $100 a month. If you are looking for cheaper alternative then go for group buy or shared accounts.