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Opencals Storefront API
Build custom booking sites on a booking backend
The Opencals Storefront API is now public! It's a clean REST API and typed TypeScript SDK for building fully custom booking websites – browse services, check real-time availability (single slots or date ranges for rentals), filter by staff and location, collect Stripe payments, and manage customer accounts. All the hard parts – double-booking, timezones, multi-staff and multi-location logic – are handled server-side.
Quick version: Opencals is to service businesses what Shopify is to product businesses – booking, staff, locations, payments, deposits, and customer accounts as real operational infrastructure. Today we opened our Storefront API + TypeScript SDK so anyone can build their own booking website on top of it.
Here's the thing we kept running into: most service businesses don't want a generic booking page – not even a "customizable" one. They want a site that's actually theirs. So instead of locking everyone into one hosted UI, we made the whole storefront programmable. Start from one of our free open-source templates, or build something completely custom on the API/SDK, you can even vibe-code it with AI in an afternoon. The booking brain (real-time availability, multi-staff, multi-location, deposits, group bookings, rentals, Stripe) is already handled server-side.
How fast it actually is:
Create an account → get a free API key (no card)
You instantly have a full dashboard with every feature working, seed your store with demo data
Clone a template, deploy to Vercel, paste your key
One question I'd love your take on: if you run (or build for) a service business – what industry should we ship the next free template for? Barbershops, tattoo studios, rentals, fitness/classes…? Tell me and I'll build it.
Happy to go deep on anything – the availability model, the SDK, pricing, or what's next on the roadmap :)
About Opencals Storefront API on Product Hunt
“Build custom booking sites on a booking backend”
Opencals Storefront API was submitted on Product Hunt and earned 4 upvotes and 1 comments, placing #34 on the daily leaderboard. The Opencals Storefront API is now public! It's a clean REST API and typed TypeScript SDK for building fully custom booking websites – browse services, check real-time availability (single slots or date ranges for rentals), filter by staff and location, collect Stripe payments, and manage customer accounts. All the hard parts – double-booking, timezones, multi-staff and multi-location logic – are handled server-side.
On the analytics side, Opencals Storefront API competes within API, Open Source, SaaS and GitHub — topics that collectively have 250.5k followers on Product Hunt. The dashboard above tracks how Opencals Storefront API performed against the three products that launched closest to it on the same day.
Who hunted Opencals Storefront API?
Opencals Storefront API was hunted by Stan. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Opencals Storefront API including community comment highlights and product details, visit the product overview.
Stan
Hey Product Hunt 👋 I'm Stan, founder of Opencals.
Quick version: Opencals is to service businesses what Shopify is to product businesses – booking, staff, locations, payments, deposits, and customer accounts as real operational infrastructure.
Today we opened our Storefront API + TypeScript SDK so anyone can build their own booking website on top of it.
Here's the thing we kept running into: most service businesses don't want a generic booking page – not even a "customizable" one. They want a site that's actually theirs. So instead of locking everyone into one hosted UI, we made the whole storefront programmable. Start from one of our free open-source templates, or build something completely custom on the API/SDK, you can even vibe-code it with AI in an afternoon. The booking brain (real-time availability, multi-staff, multi-location, deposits, group bookings, rentals, Stripe) is already handled server-side.
How fast it actually is:
Create an account → get a free API key (no card)
You instantly have a full dashboard with every feature working, seed your store with demo data
Clone a template, deploy to Vercel, paste your key
Live in ~5 minutes – the same site as the demo
Links to play with:
🔗 Live demo: https://template-haar.vercel.app
💻 Open-source template (MIT): https://github.com/letsopencals/template-haar
📦 SDK on npm: https://www.npmjs.com/package/@opencals/storefront-sdk
📖 API docs: https://api.opencals.com/docs/storefront
One question I'd love your take on: if you run (or build for) a service business – what industry should we ship the next free template for? Barbershops, tattoo studios, rentals, fitness/classes…? Tell me and I'll build it.
Happy to go deep on anything – the availability model, the SDK, pricing, or what's next on the roadmap :)