Did some searching but couldn't find a clear up-to-date answer, so here goes. Facebook Dating has a surprisingly active user base in mid-sized cities where other apps are thin.
Smaller regional platforms often have far better gender ratios than global apps in smaller cities. Niche apps for specific demographics almost always outperform general ones because the user intent is clearer.
Apps already on my radar:
- OkCupid
- Match.com
- eHarmony
- Plenty of Fish