Hello @sean2masaaki, I hope you are well.
I am faisalamin developer and witness of SteemPro. I am also the core developer of SteemMobile and actively maintaining the app.
These both projects are also open-source.
SteemPro GitHub
https://github.com/faisalamin9696/steempro-next
SteemMobile GitHub
https://github.com/rme-phantom/steemmobile
We are also planned to add more features in both Web and Mobile app. You support will definitely encourage us to push our boundaries in a good direction.
You can support the project by casting the witness vote for @faisalamin
You can also use SteemKeychain to sign the transaction via SteemPro. Wish you all the best of luck 👍. Looking forward