Preferred pressure on a 1 to 5 scale, zones to avoid, allergies, notes from the last visit. Reception sees the phone number; the specialist sees the card.

A client who has to repeat 'not so hard on the left shoulder' at every visit does not feel remembered. The card remembers for the whole team, including the new specialist who sees this client for the first time.
Contact details are a separate permission. The owner and reception see the phone; a specialist sees the name and the card. That is how a salon keeps its client base when a specialist leaves.
14 days free. Then €5 a month plus €2 for each extra account during launch. No contract.