Session vs Wunderbook
Session and Wunderbook are both free to set up, with no contract. The difference is who pays: Wunderbook adds a 2% fee to your customers’ bookings, while Session charges your venue 0.5% per paid booking, capped each month, and your customers pay the ticket price.
Founder of Session, setting up a community sauna in Cardiff
Updated 29 September 2026
Wunderbook details read on wunderbook.app
Compared on
Who pays the fee
Monthly cap
Private hire
Flexible start times
Per-guest waivers
WHO PAYS
Customers pay the ticket price
Session’s 0.5% is paid by the venue. Wunderbook adds 2% to your customer’s booking.
MONTHLY CAP
Capped every month
Session’s fee stops at US$150, £100, €90 or A$150 a month. Wunderbook doesn’t publish a cap.
FOCUS
Only saunas
Session is built just for saunas. Wunderbook also serves gyms, pilates and yoga studios.
WHAT SESSION ADDS
What Session adds for a sauna
Wunderbook is the closest thing to Session in spirit. These are the places it’s different.
No fee on your customers
Customers pay exactly the ticket price. Session’s fee comes from the venue.
A monthly cap
Session’s 0.5% stops at US$150, £100, €90 or A$150 a month, however busy you get.
Private hire
A private hire price books out the whole session, so nobody else can join it.
Flexible start times
Guests choose how long they stay, and starts that overlap share the sauna’s spaces, so it’s never overbooked.
Per-guest waivers
Each guest signs on their own phone, and staff see who has signed at check-in.
Built only for saunas
The booking page, calendar and check-in are all designed around shared sessions.
AT A GLANCE
Session and Wunderbook side by side
SESSION
WUNDERBOOK
Saunas
Saunas, independent gyms, pilates and yoga studios
Free to set up. 0.5% per paid booking, capped monthly
No monthly fees
The ticket price, with no booking fee
A 2% transaction fee
US$150, £100, €90, A$150
Not published
Stripe, into your own account
Stripe
None
None
Yes, with included sessions, member rates and early access
Yes
Per-guest, checked at check-in
Yes
A private hire price books out the whole session
Not published
Flexible start times
Guests choose a length, and overlapping starts share one set of spaces
Not published
Yes, with who has signed their waiver
Yes
Yes, from one account
Yes
Wunderbook details as published on wunderbook.app on 29 September 2026. “Not published” means we couldn’t find it on the vendor’s own site.
PRICING
The fee difference, plainly
Both are free to start, and both take card payments through Stripe. Wunderbook charges your venue nothing and adds 2% to each customer’s booking. Session charges your venue 0.5% per paid booking, capped each month, and adds nothing for your customer. Larger operators: talk to us about a rate for your size.
See full pricing
On a US$20 session
SESSION
WUNDERBOOK
Customer pays
US$20.00
US$20.40
Platform fee
US$0.10
US$0.40
Monthly cap
US$150
Not published
Stripe’s card fee applies on both. The cap is £100 in the UK, €90 in Europe and A$150 in Australia.
WHERE WUNDERBOOK FITS
When Wunderbook is the better pick
Wunderbook is a friendly tool for independent venues, and for some it’s the better fit.
You’d rather your customers paid the fee
Wunderbook costs your venue nothing, because the 2% is charged on each customer’s booking.
You run a gym or studio as well as a sauna
Wunderbook covers gyms, pilates and yoga as well as saunas, in one tool.
Both are built for independents. The difference is who pays the ongoing fee, how much, and how deep the sauna features go.
“We are a new sauna business in Australia and spent quite a bit of time looking at different booking systems before coming across Session. Once we found it, we honestly haven’t looked at another system since.”
S
Sarah W
Sauna business in Australia
5 countries
Live venues in the UK, Ireland, the US, Australia and New Zealand
Common questions
Is Session or Wunderbook better for a sauna?
Both are free to set up with no contract, so it’s close. Session is built only for saunas, with private hire, guests choosing how long they stay and per-guest waivers checked at check-in, and your customers pay the ticket price. Wunderbook costs your venue nothing but adds a 2% fee to each customer’s booking, and also serves gyms and studios.
Does Session add a booking fee for my customers?
No. Session’s 0.5% is paid by your venue, capped each month in your own currency (US$150, £100, €90, A$150), so customers pay exactly the ticket price. Wunderbook adds a 2% fee to the customer’s booking.
Is Wunderbook free?
Wunderbook has no monthly fees for your venue. It charges a 2% transaction fee to the people booking, so your customers pay it instead. Session is also free to set up, and charges your venue 0.5% per paid booking, capped monthly, rather than charging customers.
Booking software built for saunas
Free to set up. 0.5% per paid booking, capped each month in your own currency.
Last updated: 29 September 2026. Written by Wil Grace, founder of Session. Competitor details are as published on each vendor’s own site that day.