Bottr offers Free Trial, but Gravity does not.
The starting price of Bottr begins at $29/month, while pricing details for Gravity are unavailable.
Gravity offers several advantages, including Private data security, On-device operation, Data never leaves device, Contextually aware assistance, Accumulates personal knowledge and many more functionalities.
The cons of Gravity may include a Only works on Mac, Optimized for Apple Silicon, No cloud backup, Possible high storage consumption. and Inability to share knowledge