I have used Tutorhunt, Tutorful and Mytutor.
Tutorhunt was my favourite as I sourced two good long-term tutors there. Both were qualified teachers, local, doing face -to -face tuition (one started online in lockdown then moved to face -to-face when permitted), the other was pre-pandemic so always face-to-face. In both cases I purchased the tutors details and had a direct relationship wuth them rather than booking lessons through tutorhunt. However Tutorhunt seem to be phasing this out now so last time I looked it was only possible to do this with those tutors who have been on tutorhunt for several years.
I sourced one tutor via Tutorful who was not a qualified teacher but seemed promising. I had to pay tutorful directly though and after booking two trial lessons in quick succession in different subjects they raised his hourly rate quite a lot to more than I wanted to pay. I felt somewhat tricked as if I was offering that higher hourly rate I would have been considering that tutor alongside some other tutors I had ruled out on price. The hourly rate seems to go up according to popularity so as I was looking for a long term tutor with whom we might book lots of lessons I did not want to be locked into an ever rising hourly rate that would go up if I booked lots of lessons! He didnt seem that great as a tutor either so I cut my losses and didnt arrange further lessons.
On Mytutor I made contact with an low cost tutor to do drama and singing lessons with my daughter. She was not a qualified teacher but a drama graduate from a top drama school. It never got off the ground as we had various lockdowns and only wanted face-to-face tuition but I thought the website seemed good for finding low cost tutors who were not qualified teachers but had some good skills to offer.