There are many ways of access the SAP HANA database. The SAP HANA Cloud platform is a commonly used solution for SAP HANA app development. It is offered as a PaaS (platform as as service) HANA system and you can create and run your applications using this platform.
HANA studio and client are mostly used to access the database. Administrators use these tools to monitor the database. They permits you to connect with the HANA instance through a PC and build your application. SAP HANA Cockpit is another tool that you can use to access the database. Using any browser, you can acces it to develop an application on HANA and administrate the database.