Best Tools for Building a Booking App
iCal sync, multi-property availability, embeddable widgets — the stack that handles all of it
I built BookBed — a multi-tenant booking SaaS with bidirectional iCal sync, embeddable booking widgets, and Stripe subscription billing. Before that, I spent weeks evaluating tools that looked good in demos but fell apart on real requirements. Here's what actually works.
Postgres for availability logic, RLS for multi-property isolation
Booking availability is fundamentally a date-range query problem. Postgres handles it better than any NoSQL alternative — date range exclusion queries, overlap detection, and timezone handling are all first-class SQL. Supabase adds auth and RLS so multiple property owners can't see each other's bookings.
Parse and generate iCal feeds for Airbnb/Booking.com sync
iCal sync is how you prevent double-bookings across Airbnb, Booking.com, and your own platform. The protocol is simple — an `.ics` URL that other platforms poll. `node-ical` handles parsing incoming feeds; generating outgoing ones is straightforward with `ical-generator`. Bidirectional sync requires a scheduled job that polls external feeds and marks blocked dates.
One-time booking payments and platform fee handling
For a booking platform, you need to charge guests and optionally split revenue with property owners. Stripe Connect handles the platform fee model cleanly. Payment intents give you the authorization-then-capture pattern for holds. For simpler setups, Stripe Checkout handles the entire payment flow.
Booking confirmations, owner notifications, reminder sequences
Booking apps need transactional email that's actually reliable — confirmation on booking, reminder 24h before, cancellation notice. Resend handles these with clean React Email templates. The Supabase Edge Function → Resend pattern works well: trigger emails from Postgres events without a separate email service.
Embeddable booking widget + host-facing dashboard in one codebase
An embeddable booking widget is just a Next.js route that can be iframed into any external site. The same codebase serves the widget, the host dashboard, and the admin panel — no separate widget SDK to maintain. CSP and CORS configuration requires care for iframed content.
For a booking app: Supabase (availability queries + RLS) + iCal libraries (sync with Airbnb/Booking.com) + Stripe (payments) + Resend (notifications) + Next.js (widget + dashboard). The iCal sync piece is the one most teams underestimate — plan 3–4 days for bidirectional sync with proper conflict resolution.