The Opencals Storefront API is booking infrastructure for builders — a REST API for services, real-time availability, carts, checkout, and payments, so you can build a fully custom booking experience on any stack.
Opencals is a standalone-first booking platform: the dashboard runs your scheduling, staff, services, and payments, and the Storefront API exposes all of it over REST so you can build the customer-facing side yourself — your own booking page, your own stack, your own design.Think of it as booking infrastructure for builders. Opencals handles the scheduling engine, payments, and conflict prevention — you keep full control of the front end.
If you’d rather start from working code, Opencals publishes free open-source booking templates built on this exact API — browse them at opencals.com/docs/open-source/templates.
Last modified on August 31, 2026
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