What Does It Cost to Develop a Booking App?

Booking apps look simple: a calendar, a few time slots, a button. But underneath sits the logic that decides the whole project’s cost – resources that can’t get double-booked, rules for canceling and rebooking, reminders that need to go out at the right time. Most booking apps land between SEK 500,000 and 1.5 million, and where you fall in that range mainly depends on how much of that logic gets built from scratch.

Price ranges by level

The calendar and resource logic is the core

What sets a booking app apart from an ordinary content app is that it makes promises: that the time you booked is yours, that no one else got it at the same moment, and that you’ll get reminded. Three areas drive the complexity:

• Double bookings. When two users want the same slot at once, only one can succeed. It sounds obvious but is a genuine concurrency problem that has to hold up even when a hundred people are chasing canceled slots after a mass notification.
• Cancellation rules. How late can someone cancel? With or without a fee? What happens to the payment, and does the slot get released to the queue automatically? Each rule is simple – the number of combinations is not.
• Reminders. Notifications and texts at the right time, accounting for time zones, rebookings, and cancellations. Mistakes here show up immediately as no-shows – or irritated customers.

The more resource types that interact – rooms, staff, equipment, group sizes – the more logic is needed. A hair salon with five chairs is a simpler world than a facility with courts, coaches, and equipment that all need booking together.

Build your own, or an app on top of a booking SaaS?

The biggest budget question is whether the booking engine should be built at all. Mature booking SaaS services exist that handle calendars, rules, and payments; the app then becomes a shell that gives you a branded experience, push notifications, and quick access, while the service does the heavy lifting.

The trade-off is classic: SaaS gives you a low starting cost but ongoing fees – often monthly, sometimes per booking – plus the service’s limits. A custom build costs more now but gives full control and a lower marginal cost per booking. A reasonable rule of thumb: start with the SaaS route if your needs are standard and volume is still unproven, and build your own once the fees start approaching what a custom solution would cost in maintenance – or when the service’s limits start holding your business back.

Also factor in the exit cost in both directions: leaving a SaaS means data migration and rebuilding what the service did, leaving a custom-built engine means someone has to maintain it in the meantime. The choice is rarely forever, but the direction should be a conscious one from the start.

A worked example

A padel facility with three halls wants an app where members book courts, pay with Swish, and get notified when slots open up. With a ready-made booking engine behind the app: around SEK 600,000–800,000 and 3–4 months. If they choose custom booking logic instead – to package memberships, dynamic pricing, and corporate bookings the SaaS service doesn’t support – the project lands closer to SEK 1–1.3 million.

The difference, a few hundred thousand kronor, is the price of full control over the business logic. Sometimes it’s worth it, sometimes not – but that’s exactly the question that should get settled before development starts, not after.

Getting the right price

Describe your resources, rules, and volumes as concretely as possible – that’s what gets priced in the quote. Ask the vendor to justify the choice between a SaaS foundation and a custom build in kronor, not opinions. And require the payment flow to be specified separately – advance payment, cancellation fees, and refunds are where booking apps tend to hide their extra hours. At Weapp we’ve built booking flows in both models and are happy to give you a price range for your scenario: read about our services or get in touch.