Startup exhibitorShopify for
service businesses.
Merchants launch a booking storefront with no code. Developers and agencies build custom booking products on our public API. We're in Lisbon to meet the people who'll build on it.
Doors open in
Web Summit Lisbon 2026
Opencals is exhibiting at Web Summit Lisbon.
Web Summit is one of the largest tech conferences in the world, bringing founders, investors, developers and press to Lisbon every November. We're there as a startup exhibitor to meet builders, partners and investors.
Opencals on Web SummitPick your path
Who are you meeting in Lisbon?
Developers & agencies
Build custom booking sites and products for your clients on our API and open-source templates. Your design, our booking engine.
See what you can buildPartners
AI receptionists, vertical SaaS, marketplaces, payments. Plug a real booking and checkout engine into your product instead of building one.
Partnership ideasInvestors
We're raising a pre-seed round to build the commerce layer for service businesses. Let's grab 20 minutes in Lisbon.
Why OpencalsThe idea
Everything Shopify gives products, built for services.
Shopify ships default themes, and almost nobody uses them. Merchants hire developers to build something that fits their brand. Booking has been stuck on generic widgets. Opencals works like Shopify for service businesses: sign up with no code on day one, go fully custom when you're ready.
For developers & agencies
Booking infrastructure you can build on.
Every screen in Opencals has an API equivalent. You bring the product and the design, we run the booking engine, payments and dashboard your client logs into.
AI receptionists that book for real
Your voice or chat agent handles the conversation. Opencals holds the availability, staff, payments and confirmations.
Vertical booking products
Padel clubs, clinics, salons, studios. Build the niche UX, skip building scheduling, checkout and invoicing.
Service marketplaces
List many providers, each with their own calendar, rules and payouts, on one engine.
Custom client sites
Agencies ship a branded booking site per client from our templates instead of embedding a generic widget.
Start from an open-source template
MIT-licensed Next.js storefronts wired to the Storefront SDK. Clone, restyle, ship.
For partners
You bring the users.
We bring the booking engine.
If your customers are salons, clinics, studios, clubs or any business that sells time, there's probably something we can build together.
AI voice & chat agents
You answer the call. We give the agent live availability and a place to write the booking, with payment and reminders handled.
Payments & fintech
Every Opencals booking is an order with a payment and an invoice. Service businesses are a payments audience that books every day.
CRM, messaging & loyalty
Bookings are the event your product reacts to. Signed webhooks push every booking change to you as it happens.
Website builders
Add a real booking and checkout flow to the sites you generate, instead of linking out to a third-party page.
For investors
The commerce layer for businesses that sell time.
Opencals is founder-built in Warsaw, live since 2024, with 150+ businesses on the platform and a public API shipped. We're raising a pre-seed round and would love to walk you through it in person.
Commerce, not a calendar
Every booking is an order with a payment, invoice and customer record. We're building the commerce layer for businesses that sell time, the way Shopify did for businesses that sell products.
Free for builders, forever
Development stores are free for life, with every endpoint and feature. Developers build and demo a client's site before the merchant pays anything, so each new builder brings merchants with them.
Open at the edges, owned at the core
Templates and SDK are MIT-licensed and pull developers in. The engine, payments and merchant data stay on our platform.
One engine, any service
Appointments, rentals, classes, multi-day courses and stays run on the same core. Configured, not rebuilt per vertical.
Let's meet
See you in Lisbon.
I'm Stan, the founder. Pick a day, tell me what you're working on, and I'll send a time and a spot at Web Summit. Coffee is on me.
