What I would check before committing any time to free serious dating sites:
- if read receipts does anything measurable — worth checking before you commit to serious dating sites
- how the age filter behaves once you actually use serious dating sites
- how the block and report tools behaves once you actually use serious dating sites
On free serious dating sites, what you get without paying is what matters.
If how the location radius behaves once you actually use serious dating sites is not there, I do not bother with serious dating sites at all.
The thing people miss about free serious dating sites is that what the free tier actually allows is the real question.
You can usually spot the difference on serious dating sites by how the account handles a direct question.
Worth a look if you want a comparison point — Datescout handled serious dating sites better than I expected.