Partiko is a mobile app for Steem which is available on both Android and iOS. I started using Partiko just few days back and I am totally loving it, it is fast and user friendly.
You can try out the App here
Not only this, they have an internal point system where you can earn points by doing simple tasks such as upvoting, commenting and posting through Partiko app. These points can then be redeemed to get upvotes.
Partiko is running their delegation program where Steemians can delegate a portion of their SP and will receive rewards in terms of upvotes and Partiko points, you can read more about it here.
I decided to delegate 500 SP to Partiko as I believe this app will help in the mass adoption of Steemit by allowing even new users to earn money on the platform and its internal reward system will encourage community engagement. I believe this is just the beginning, there are a lot of good things in store.