ArcGIS vs PostGIS: What are the differences?
Developers describe ArcGIS as "A geographic information system for working with maps *". It is a geographic information system for working with maps and geographic information. It is used for creating and using maps, compiling geographic data, analyzing mapped information, sharing and much more. On the other hand, *PostGIS** is detailed as "Open source spatial database". PostGIS is a spatial database extender for PostgreSQL object-relational database. It adds support for geographic objects allowing location queries to be run in SQL.
ArcGIS belongs to "Mapping APIs" category of the tech stack, while PostGIS can be primarily classified under "Database Tools".
PostGIS is an open source tool with 663 GitHub stars and 251 GitHub forks. Here's a link to PostGIS's open source repository on GitHub.
According to the StackShare community, PostGIS has a broader approval, being mentioned in 62 company stacks & 105 developers stacks; compared to ArcGIS, which is listed in 6 company stacks and 5 developer stacks.