Cal.com vs SimplyBook.me vs Acuity Scheduling: Booking Software for Spiritual Practitioners (2026)

A spiritual coach asking whether Cal.com is "really free" is asking the right question. The hosted cal.com product is free for solo practitioners with basic scheduling needs and no monthly cost. But Cal.com's relationship with open source changed in 2025/2026, and the self-hosted version now lives under a separate project. Understanding the distinction matters before building a client booking workflow around either.

This comparison covers real 2026 pricing for three booking tools and a payment note that applies to all of them: every platform in this comparison connects to Stripe for payment at time of booking, and Stripe's September 2024 policy change restricted occult and spiritual services.

Verify current pricing at cal.com/pricing, simplybook.me/en/pricing, and acuityscheduling.com before committing.

Payment Processing Note

Cal.com, SimplyBook.me, and Acuity Scheduling all use Stripe or PayPal for built-in payment collection at the time of booking. Stripe's prohibited merchant category update in September 2024 added occult and spiritual services. If a practitioner's Stripe account is flagged, the booking tool's payment module stops working.

The simplest workaround: use booking tools for scheduling only (all three offer free or low-cost tiers for scheduling without payment), and direct clients to pay separately through Payhip or NowPayments before or after the booking is confirmed. Cal.com's free plan supports this pattern cleanly.

2026 Pricing at a Glance

Cal.com Enterprise: custom. SimplyBook.me Enterprise: custom (multi-location). All prices approximate as of mid-2026.

Cal.com

Cal.com Free (hosted) includes unlimited event types, unlimited calendar connections, and basic payment collection through Stripe or PayPal. For a solo practitioner who needs: clients to book a 60-minute reading, a Google Calendar sync so the slot blocks automatically, and a confirmation email, the free plan handles all of it with no monthly cost.

Important context on open-source status: Cal.com moved its core product to a closed-source model in 2025/2026. The free self-hostable community edition is now a separate project called Cal.diy, which requires technical expertise to deploy and maintain. For practitioners who want to self-host to avoid any third-party dependency, Cal.diy is the path, but it is not a one-click install.

Cal.com Teams costs approximately $12/user/month (annual billing) and adds round-robin scheduling, team availability management, and collective event types. Cal.com Organizations at approximately $28/user/month adds org-level management. Both verified-approximate; confirm at cal.com/pricing.

For a solo practitioner, Cal.com Free handles the entire booking workflow at no ongoing cost. The main reason to upgrade is team scheduling.

Cal.com's built-in integrations include Google Calendar, Outlook, Zoom, and Google Meet. A practitioner can set up a booking page where clients choose between an in-person reading, a video reading via Zoom, and a phone reading, each with different durations and automatic conference link generation. The booking confirmation email is sent automatically; no manual step required. For a solo practitioner handling 5-15 bookings per week, Cal.com Free eliminates the back-and-forth that typically happens over Instagram DMs or email threads.

SimplyBook.me

SimplyBook.me Free allows booking but limits the number of custom features available. The platform's distinctive feature is its "Feature Pod" system: practitioners pick and pay for specific add-on capabilities (recurring appointments, gift cards, package bookings, intake forms, waiting lists) rather than paying for a tier that bundles features they do not need.

SimplyBook.me Basic at $13.90/month is the entry paid tier. Standard at $29.90/month and Premium at $59.90/month expand booking volume, staff/provider count, and the number of Feature Pods included. A 14-day free trial is available.

SimplyBook.me is the most flexible no-code customization tool in this comparison. A multi-service practitioner offering readings, chart consultations, group workshops, and physical product pickups can configure the booking flow differently for each service type without touching code. The Feature Pod model means practitioners pay for what they use.

Pricing depends on booking volume and provider count, not just plan tier. Verify actual cost for your specific configuration at simplybook.me/en/pricing.

A specific use case where SimplyBook.me outperforms the alternatives: a healer who offers individual 60-minute sessions, group healing circles limited to 8 participants, a 4-session package deal, and a gift voucher option. SimplyBook.me handles all four through Feature Pods without requiring separate tools. Cal.com Free handles individual sessions and some group scheduling, but package deals and gift cards require paid plans and third-party integrations. Acuity Growing at $27/month covers packages and group classes, but at a higher monthly base than SimplyBook.me Basic.

Acuity Scheduling

Acuity is a Squarespace product. It has no free plan; the entry tier is Emerging at $16/month. Growing at $27/month adds SMS reminders, package bookings, memberships, and up to 6 staff or locations. Powerhouse at $49/month adds HIPAA compliance, multiple time zone support, and up to 36 staff or locations.

The HIPAA option on Powerhouse is relevant for practitioners who also work in wellness or therapy contexts where client session notes and health disclosures require privacy compliance. No other tool in this comparison offers HIPAA-compliant scheduling at a comparable price.

Acuity's intake form and client management features are mature. Practitioners can collect detailed pre-session questionnaires (birth time, location, current situation) and store responses alongside the appointment record. Integration with Squarespace websites is native; integration with other site builders requires Zapier.

Acuity also handles subscriptions and memberships at the Growing tier: a practitioner can sell a monthly subscription for priority booking access, a discounted session rate, or a set number of sessions per month. Members book using a separate booking link that reflects their subscription entitlements. This removes the need for a separate membership tool for practitioners whose primary membership benefit is session access rather than gated content. Compare this approach against the tools in comparison/memberstack-vs-memberful-vs-outseta to determine whether scheduling-native or content-native membership tools better fit the practice.

Which Should You Choose

Solo practitioner, no budget for booking software: Cal.com Free. Unlimited event types, calendar sync, booking page, no monthly cost. Use a separate payment link for Payhip or NowPayments instead of the built-in Stripe payment module.

Multi-service practitioner, flexible per-feature customization: SimplyBook.me Basic at $13.90/month. The Feature Pod model avoids paying for a tier that bundles features irrelevant to your service type.

Practitioner with a team or multiple staff taking bookings: Cal.com Teams at approximately $12/user/month for round-robin and collective scheduling. SimplyBook.me Standard at $29.90/month for multi-provider no-code configuration.

Wellness or therapy practitioner requiring HIPAA compliance: Acuity Powerhouse at $49/month is the only HIPAA-compliant option in this comparison.

For a broader view of how to structure payments for esoteric services without Stripe dependency, see comparison/calendly-vs-acuity and guides/accept-payments-esoteric-business.

Frequently Asked Questions

Is Cal.com still open source in 2026?

Partially. Cal.com moved its main hosted product to a closed-source model in 2025/2026. A self-hostable community edition called Cal.diy is available for technical users who want to run their own instance. The hosted cal.com product remains free for solo use with no technical setup required.

What are SimplyBook.me's Feature Pods?

Feature Pods are individual add-on capabilities that practitioners can activate on their SimplyBook.me account. Examples include recurring appointments, intake questionnaires, gift cards, and waiting lists. Instead of paying for a higher tier to unlock a feature you need, you activate specific Pods. The number of active Pods allowed scales with the plan tier.

Does Acuity Scheduling require a Squarespace account?

No. Acuity Scheduling is a standalone product. A Squarespace website is not required to use Acuity. Integration with Squarespace is native if you use both, but Acuity works independently with any website via its embed code or booking link.

How do practitioners collect payment without using Stripe in their booking tool?

The straightforward approach: configure the booking tool to require no payment at booking time, then send the client a separate payment link (Payhip product page, NowPayments invoice, Wise request) in the confirmation email or before the session. This separates the scheduling function (where these tools are strong) from the payment function (where Stripe dependency creates risk).