What is the Pathbuilder 2e application, how does it work?

According to the introduction of David Wilson (Redrazors), Pathbuilder 2e is a Entertainment app on the Android platform. There is currently a 22 version released on Nov 19, 2018, you can see the details below.

Pathbuilder 2e is a character planner and sheet for the new PFRPG 2e playtest. You can plan out your characters and then either export them as a PDF character sheet or use the app itself as a character sheet.

Added Lost Omens Legends, Agents of Edgewatch Player's Guide, AP 157
Improved filters and info for weapons.
Added quick buttons to the hp dialog.
Added multi buy option for gear.
Fixes for v94 (optional flaw warning and invisible weapon traits).