Vector database - which one are you using?

Like most indie-developers, I am excited about LLMs and cannot stop thinking about possible product ideas.

Vector database is a core component of an LLM based app. With ChatGPT's rising popularity, the race for best vector database has started too, with several database projects raising funds in the past month.

I am currently building https://ai.engage.ninja/ and at a cross-roads to choose my vector database.

Fellow devs, which one are you using and why ?