Unlike other commentators I don't think you need a free trial, but I think you need a couple of free searches per day for example. Let me try my brand and maybe a competitors, see the results and then if I try to get one more, or if I want to export the results or whatever let me know this and many other nice things are available for registered users.

Also I'd like to know how I'll be alerted, will I get an email for every single mention or is there the possibility to have hourly/daily/weekly digests ?

Either way I think this is a good alternative to the other services out there and I could probably see myself using that on a side-project soon as the fairly low price isn't a barrier to me at all ! $7 is like free except you get money, unlike the limited free trials that get very expensive for the lowest plan available.

Nice work, bookmarking and eager to see actual results !