Well done for scratching your own itch, highly commendable.
A few traps for young players to watch out for:
As Steve mentioned the insurance thing is important, are you licensed/qualified to be providing personalised "real-time advice"? If not then you'll need appropriate disclaimers to save you from people blaming you if they follow your suggestions and don't like the outcomes.
The legal thing is important to get right for a couple of reasons. First off you want to be able to distance your own finances from what happens with the product, so run it through a company or similar to prevent you personally getting sued or whatever.
Secondly Exact is a pretty common usage word. A quick trademark search returned nearly 1,000 registered US trademarks containing the word. Chances are pretty good some of them will be software or finance related. Any of those could be a patent/trademark troll that decides to opportunistically sue you for infringing their trademark, or hit you with a cease and desist to stop using "their" name. They mightn't be in the right, but chances are you couldn't afford to defend the action either way. If that happens now it would be inconvenient, if it happens in 12-18 months time when you've paid out a bunch of money to build your brand and advertise then it would really ruin your day.
You'll have some privacy and data protection obligations to meet, these will vary by the markets you operate in. For example as soon as you sign up European folks like Divnomics and Lars-Christian you would become subject to the European GDPR regulations that come into effect next May, exposing yourself to fines of up to 4% of your global turnover each time you suffer a data protection breach. Today that might be the price of a happy meal, but in a couple of years time when your product is wildly successful it could be quite a big number.
In summary: seek professional advice on the legals front.
Position your product for what it stands for, what it does, not as a clone of some other product that you have personally found wanting.
Tell your target audience why they should entrust you with their (very) sensitive internet banking/brokerage login details. If the likes of LinkedIn, Target and Yahoo can't keep their customer's details safe from hackers or opportunists then why are you any better?
Finally figure out why you're doing this long term. If it is really "100% free" and you're not intending to sell your list to financial advisors "You own your email, not us. You have our anti-spam email promise." or include advertising (the thing you hated about a competing product), then how are you planning to cover your AWS hosting costs + insurance + not to mention the value of your own time and effort?