So you have a paid service to calculate a persons taxes. This is offered on https://www.bitcoin.tax . They have a free version that someone can submit their taxes on and also they have a paid version. Also, they can refer you to tax professionals (they deal with happy tax). What advantage do you have over this?
I just used bitcoin.tax to calculate my 2017 returns, it has a terrible UX and also does not offer a real time portfolio monitoring service. They also have grander ambitions to offer a portfolio investment service.
The main difference comes down to user experience — it is much easier & simpler to use CoinTracker. Additionally, we offer free portfolio tracking so you can verify for yourself that we are actually doing everything accurately & try before you buy.