Which customer-facing knowledge base software does your startup use

We (also a startup) are trying to navigate this overwhelming and possibly saturated landscape of support / knowledge base software to find a suitable one as a support / documentation portal on our product for our customers.

Searching for reviews / experiences on said software just results in "reviews" from respective software providers trying to do some not-so-subtle marketing of their own products so I thought I'd try a slightly more unbiased source.

The requirements are simple: - Just a knowledge base software. I know most offerings come with a full arsenal of support services and what's not but we're really not there yet - Sensible pricing plans for a startup - Usability, but that's kinda obvious

What are your experiences in general?