Most of them are also owned by a single company. Match Group inc. Some of the more notable ones are:
- Her
- Hinge
- Match.com
- OkCupid
- Plenty of Fish
- Tinder
As well as most of the _ People Meet apps. Ie:
- Black people meet
- Democratic people meet
- Republican people meet
- Latino people meet
- etc
So it is no coincidence that these apps suck.