Cal.com vs the usual booking tools for therapist appointments

For a solo therapist choosing a booking tool, Cal.com is the best default: free or low-cost, GDPR-appropriate by default, and embeddable directly on your website. Calendly is more polished but pricier and less flexible on its free tier. Acuity and SimplePractice offer more clinical features, at a cost and complexity that only pays off if you actually need them. This post compares them directly for therapists deciding between tools, rather than explaining what any one of them does. For a fuller walkthrough of how Cal.com itself works, see our dedicated Cal.com guide.

What actually matters when choosing a booking tool

Before comparing tools, it is worth being clear on what a therapy practice specifically needs from one, because this is not the same list a hairdresser or personal trainer would use. You need recurring weekly bookings without rebooking manually each time, intake questions at the point of booking, payment collection upfront to reduce no-shows, a way to set buffers between sessions, and data handling that holds up under GDPR. Anything beyond that is a nice-to-have, not a requirement.

Cal.com

Cal.com is free at its core tier and around €12/month for the pro tier, which adds SMS reminders and a few scheduling extras most solo therapists will not use. It connects to Google Calendar or Outlook, supports recurring bookings, takes Stripe payments directly, and can be embedded as a widget on your own site so clients never leave it to book. Data is stored in the EEA by default and Cal.com provides a Data Processing Agreement, which matters for GDPR.

The honest limitation is intake forms: Cal.com's are functional but basic. If you need branching questions or a signed consent form at the point of booking, you will likely want a separate form tool alongside it. For most solo therapists, that trade-off is worth it for the price and flexibility.

Calendly

Calendly is the most polished tool on this list and the one most people already recognise. The interface is excellent and reliability is strong. For therapists, the practical problems are the free tier's single appointment type limit, US-based data storage by default (GDPR-appropriate configuration exists but requires a paid plan and extra setup), and pricing that starts around €10/month per user and climbs for anything beyond the basics. It is a fine tool, but a therapist gets less for the same money compared to Cal.com.

Acuity Scheduling

Acuity (now part of Squarespace) is built with professional service providers in mind, including HIPAA-compliant intake forms, which matters if you have US clients but is not a GDPR requirement in Ireland or the UK. It handles more sophisticated clinical intake workflows than Cal.com out of the box. That capability comes at a real cost, starting around €20/month and rising, and with more configuration to get right. For a therapist who wants detailed branching intake questionnaires built into the booking flow itself, Acuity's extra complexity is justified. For most solo therapists, it is overhead for a feature they will not use.

SimplePractice

SimplePractice sits in a different category from the other three. It is a full practice management platform, combining booking with clinical documentation, insurance billing, and a client portal, aimed primarily at the US market where insurance billing workflows are central to how practices operate. Pricing starts around $29/month and rises with plan tier. In Ireland and the UK, where insurance billing works differently and is far less central to a typical private practice, most of what you are paying for goes unused. It is worth considering only if you specifically want session notes and booking in the same platform and are comfortable with a US-oriented tool; otherwise it is the most expensive option here for the least relevant feature set.

Which one to actually pick

For the large majority of solo therapists in Ireland and the UK, Cal.com on the free or €12 tier covers what you need: recurring bookings, Stripe payments, GDPR-appropriate data handling, and a widget you can embed directly on your own site. Choose Calendly if you specifically want its interface and are willing to pay more for it. Choose Acuity if clinical-grade intake questionnaires inside the booking flow are a genuine requirement, not a nice-to-have. Choose SimplePractice only if you want clinical notes and booking under one roof and are comfortable with a US-built platform.

Whichever tool you choose, remember it is one piece of a larger system. Booking data is not the same as clinical session notes, which need their own dedicated, GDPR-appropriate platform, covered in our post on client data storage for therapists in Ireland.

How we set this up

When we build a therapist's practice system, we configure Cal.com as the booking layer by default, connected to your calendar, your website, and Stripe, because it is the right fit for the overwhelming majority of solo practices. If your situation genuinely calls for something else, we will tell you that rather than force a default that does not fit. The Karv Web Studio therapist package includes this setup as part of a complete website, booking, payments, and admin system, built in under 30 days.