Is marketplace MFA an alternative to Auth0's own?

Hi,

I’m on the free account currently. I note that Auth0 offers MFA on the Professional package, but that’s a big step up in price. Then I noticed that there are MFA providers in the marketplace.

Are these alternatives to Auth0’s own MFA, or are they a way to achieve MFA while on the free account? (Though I understand the marketplace provider will charge me for their service.)

Thanks in advance.