Ask HN: Anybody used Retool for production, user-facing app?

Bootstrapped founder here.

I'm planning to build a SaaS product loosely in the B2B logistics space - it needs to be relatively low cost to build/maintain, look slick and be extensible.

It would be customer facing, meaning each customer would need a login/account (or perhaps many, if a whole team is using our product).

I've looked at Retool and it looks quite epic but it looks like it's designed primarily for internal apps.

Has anybody used, or attempted to use Retool for a production, user-facing app?

Would really appreciate advice, war stories or recommendations.