Helsinki Bikes is an easy to use app that helps you find HSLs City Bikes around central Helsinki. It shows all the bike stations near you or anywhere in the map with a realtime update of available bikes and free parking spaces in the stations.
Helsinki Bikes can also give you notifications when your free ride time is about to end or when you are charged certain amount of extra money. In addition to that it also calculates the extra charge that is due depending on the time.
The app is made using the open data provided by HSL and is not in anyway affiliated with HSL.
More info about city bikes from https://www.hsl.fi/en/citybikes .