Opencals
The booking engine for real service businesses
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Stan

Opencals - The booking engine for real service businesses

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Most booking tools treat services as simple calendar appointments. Real service businesses are far more complex. Opencals is service commerce infrastructure that models services as operational inventory - computing availability across staff, locations, capacity, and rules. Bookings become real transactions tied to orders, payments, and customers, enabling multi-location operations, rentals, group services, and complex scheduling without workarounds.

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Stan
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Hey Product Hunt 👋

I’m Stan, the founder of Opencals.


For the past year I’ve been building booking system for service businesses. One thing became obvious very quickly:

Most booking tools assume a service is just 1 customer + 1 provider + 1 time slot.

But real service businesses are far more complex. They deal with things like:
• multiple locations
• rotating staff schedules
• services that last hours or days
• capacity-based bookings (rooms, equipment, facilities)
• multiple attendees per booking
• deposits, cancellations, rescheduling rules


Most tools flatten all of this into a simple calendar. Opencals takes a different approach.


Instead of treating bookings as calendar events, it treats services as operational inventory - where availability is computed dynamically across staff, locations, services, and business rules.


That means bookings, orders, payments, and scheduling all live in the same system.

Opencals started as a native Shopify app (~2,000 installs), but we eventually realized service businesses need something that works everywhere they sell services, not just inside one platform.

So we built Opencals as a standalone service commerce platform.

If you want to try it:
• Visit opencals.com
• Create a store
• Configure your services and start accepting bookings

Quick spoiler 👀 We’re working on an MCP and SDK so Opencals can become booking infrastructure developers and AI systems can plug into. Stay tuned!

I’d love to hear from founders or operators running service businesses: where did existing booking tools break for you?

I’ll be here all day answering questions and collecting feedback.