Will Spark be a good choice for a micro SaaS app?

Hi, I am developing a really tiny paid web app that will do a really simple thing. I would, I need to allow user registration, creating a team (inviting sub-users to access the same data). The payment will be integrated through Paddle.com It will only give active users a search box and access to the particular database, list some items, sort in the table and export selected data to csv/xls. I was also thinking about something like Sentinel or builder.grafite.ca.

What would you recommend? Thanks a lot.