Genuine question about which free dating sites with unlimited messaging from someone who's tried the obvious routes. Every time unlimited comes up, it is worth checking the share of verified profiles before you look at how slick the interface looks. For unlimited in particular, how far the free tier gets you is the number worth watching, not star ratings from strangers.
Nothing about unlimited changes the fact that the practical move is to screenshot the pricing page in case it changes. The unlimited angle is worse, because what decides it is the churn on new sign-ups, not the price tag.
Unlimited sites is where I would start, since the platform buries the cancellation flow, so it pays to keep a note of what you actually spent. There is a pattern with which free dating sites with unlimited messaging: you get further if you screenshot the pricing page in case it changes. If you have been through the unlimited messaging version of this, I would rather hear the unglamorous account.