If you only test one thing on absolutely free dating sites for people, make it whether you can hold a conversation without paying.
I kept notes for a month on it because I kept losing track of whether the free version is a demo or a product.
Given how how far the free tier actually stretches behaves, I would only recommend the service to someone with patience.
The measure I would actually check on the app is whether 'free' means free to browse or free to talk.
The thing that finally moved the needle on the app was being specific about what the real cost is after the trial.