Sure, Im just a user of the app but happy to share what I know.
Official Website: https://www.icon-fi.com/
Twitter: https://twitter.com/ICONFiWorld
They have an android and iOS App. Im using iOS
Three Steps after signing up consist of 1) Depositing BTC then 2) Selecting flexible vs fixed savings 3) Start
Percentages would be the yield after 1 year of saving, hence Annual.
I started with .015 BTC and the 20% fixed rate limited to 7 days gave me .00005752 BTC at the end of it.
Then i rolled it into a 90 day 7.5% fixed rate.