# Opencals

> Opencals is a standalone-first booking platform and booking infrastructure for service businesses. It provides a complete booking system (dashboard, payments via Stripe, order management, customizable storefront) plus a public REST Storefront API and typed TypeScript SDK so developers and agencies can build fully custom booking websites on any stack. Shopify is supported as one integration among many — Opencals itself is platform-independent.

Key facts: multi-store, multi-location, multi-staff scheduling; group appointments; add-ons; deposits and cancellation policies; open-source booking website templates (Next.js); REST Storefront API with 50+ endpoints; webhooks (planned Q3 2026); npm package `@opencals/storefront-sdk` (v0.2.0).

## Developer Platform

- [Developers overview](https://opencals.com/developers): Booking infrastructure for builders — REST API, typed SDKs, webhooks, embeddable components
- [Developer documentation](https://opencals.com/docs): Full developer docs — quickstart, guides, interactive API reference, open-source templates
- [Quickstart](https://opencals.com/docs/quickstart): First booking API call in under 5 minutes
- [Authentication](https://opencals.com/docs/authentication): API keys (sfk_…) and customer JWTs explained
- [Interactive API reference](https://opencals.com/docs/api-reference/introduction): Try every endpoint in-browser — no API key needed to browse
- [OpenAPI 3.0 specification (JSON)](https://opencals.com/docs/api-reference/openapi.json): Machine-readable OpenAPI spec — 50+ endpoints across appointments, cart, checkout, products, staff, locations, add-ons, payments
- [Storefront SDK on npm](https://www.npmjs.com/package/@opencals/storefront-sdk): Type-safe TypeScript SDK (v0.2.0) — generated from OpenAPI spec, includes Zod schemas and formatting helpers
- [Build a booking page — tutorial](https://opencals.com/docs/guides/build-a-booking-page): End-to-end Next.js walkthrough: services → staff → availability → cart → checkout
- [TypeScript SDK guide](https://opencals.com/docs/guides/storefront-sdk): Full SDK documentation — setup, services, error handling
- [Webhooks guide](https://opencals.com/docs/guides/webhooks): Planned event catalog for appointment and order lifecycle events
- [Changelog](https://opencals.com/docs/changelog): Release notes — API, SDK, templates
- [Open source on GitHub](https://github.com/letsopencals): Free booking website templates and SDK source
- [Storefront API & SDK announcement](https://opencals.com/blog/introducing-the-opencals-storefront-api): What the API enables and how to get started

## Templates (open source, MIT)

- [Open-source templates overview and docs](https://opencals.com/docs/open-source/templates): Gallery of free Next.js booking website templates built on the Storefront API
- [Haar — salon booking template](https://opencals.com/blog/templates/haar): Free beauty salon booking website — services, staff, multi-location, Stripe checkout, customer accounts. Next.js 15, TypeScript, MIT
- [Frisor — barbershop booking template](https://opencals.com/blog/templates/frisor): Free barbershop booking website — services, staff, multi-location, Stripe checkout, customer accounts. Next.js 15, TypeScript, MIT

## Product

- [Features](https://opencals.com/features): Full feature list — scheduling, add-ons, deposits, notifications, analytics, Shopify integration
- [Industries](https://opencals.com/industries): Booking solutions by industry — beauty, fitness, medical, classes, rentals, hotels
- [Pricing](https://opencals.com/pricing): Plans and pricing — Elastic pay-as-you-go ($0.99/booking) or custom monthly from $15/mo
- [Agencies](https://opencals.com/agencies): Opencals for agencies building client booking sites
- [Shopify App Store](https://apps.shopify.com/opencals): Install Opencals as a native Shopify booking app
- [Blog](https://opencals.com/blog): Comparisons, guides, and product announcements

## Developer Guides (blog)

- [What is a headless booking system?](https://opencals.com/blog/headless-booking-system): Architecture overview — headless vs traditional, when to use each, building on the Opencals API
- [Booking API for developers](https://opencals.com/blog/booking-api): Practical integration guide — authentication, availability, cart, checkout, TypeScript examples
- [How to build a booking website](https://opencals.com/blog/build-a-booking-website): Three approaches compared — SaaS platform, Shopify app, headless API
- [Best open-source booking systems](https://opencals.com/blog/open-source-booking-system): Self-hosted platforms vs MIT templates vs open-source SDKs, 2026
- [How to add booking to Shopify](https://opencals.com/blog/shopify-booking-app): Complete guide — apps, setup, checklist before going live
- [Best Shopify appointment apps](https://opencals.com/blog/best-shopify-appointment-apps): Opencals vs Tipo vs Cowlendar vs Sesami — ranked for service businesses
- [How to sell services on Shopify](https://opencals.com/blog/sell-services-on-shopify): Complete setup guide for service businesses on Shopify
- [Online booking system for small business](https://opencals.com/blog/online-booking-system-for-small-business): Buyer's guide for service business owners

## Comparisons

- [Best hair salon booking systems](https://opencals.com/blog/best-hair-salon-booking-software)
- [Opencals vs Calendly](https://opencals.com/blog/compare/calendly)
- [Opencals vs Acuity Scheduling](https://opencals.com/blog/compare/acuity)
- [Opencals vs Sesami (Shopify)](https://opencals.com/blog/compare/sesami)
- [Opencals vs Mindbody](https://opencals.com/blog/compare/mindbody)
- [Opencals vs SimplyBook.me](https://opencals.com/blog/compare/simplybookme)