BOOKING, ENGINEERED.
The European booking platform with full UK/EU data sovereignty. All data stored and all infrastructure in the UK and EU. Paid via Mollie and SEPA. Never via Stripe or PayPal.
Entry price
£5/mo
Photon. €6/mo. Half the price of Calendly. Engineered, not subsidised.
Hosted in
EU/UK
Frankfurt + Helsinki. Hetzner Cloud. Not AWS, not Azure. Your data does not cross the Atlantic.
Paid via
Mollie
iDEAL, Wero, SEPA, Bancontact, cards. Never Stripe. Never PayPal.
WHY WE EXIST
EUROPEAN BY CONSTRUCTION, NOT BY MARKETING.
[01]
FULL UK/EU SOVEREIGNTY
All customer data stored in the UK and EU. All infrastructure in the UK and EU. Hetzner Cloud Frankfurt as primary, Helsinki as backup. Your data does not leave the region. Period.
[02]
EU PAYMENT RAILS
Mollie for customer-paid bookings. GoCardless for our subscription billing. iDEAL, Wero, Bancontact, SEPA Direct Debit, cards as fallback. Never Stripe. Never PayPal.
[03]
UK COMPANY
Atomic Engine Ltd, registered in Scotland. UK GDPR. ICO registered. Subject to UK and EU law — not the US CLOUD Act, not FISA 702.
[04]
OPEN SOURCE
Built on cal.diy, the AGPL community fork of Cal.com. Our modifications are public. You can read every line of code that handles your data.
[05]
HONEST CURRENCY
Priced in GBP and EUR using purchasing-power equivalent. £5 = €6, not the lazy 1:1 racket American SaaS uses.
[06]
NO USD
We don't charge in USD because we don't take USD. Our infrastructure is paid in EUR. Our staff are paid in GBP. Our customers pay in GBP and EUR. The whole stack is European.
THE MATHS
CALENDLY COSTS $12/MO. WE COST £5. THE DIFFERENCE IS STRUCTURAL.
We don't undercut Calendly through generosity or venture funding. We undercut them by refusing to use American payment processors. Stripe charges 2.9% + 30¢ per transaction. SEPA Direct Debit costs 1%, capped at £4. That structural saving is the price difference.
CALENDLY'S STACK
via Stripe
- > Booking value
- £100.00
- > Stripe fee (2.9% + 30¢)
- −£3.10
- Net to merchant
- £96.90
ATOMIC BOOKING
via Mollie iDEAL
- > Booking value
- £100.00
- > iDEAL flat fee
- −£0.29
- Net to merchant
- £99.71
Across our expected payment mix, our blended take is 98.7% versus Calendly's 96.9%. That 1.8 percentage points is the margin gap — we don't need to be more efficient anywhere else, we just refuse to use American card rails.
PLANS
FOUR TIERS. HONEST PRICING IN POUNDS AND EUROS.
Same number in GBP and EUR — purchasing-power equivalent, not the lazy 1:1 racket. No USD, because we don't take USD.
FREE
PARTICLE
£0
€0
- 1 paid event type
- Unlimited bookings
- 1 calendar connection
- Wero, iDEAL, SEPA, cards
- Atomic Booking branding
- 1% transaction fee on bookings
// RECOMMENDED · PRO
PHOTON
£5/mo
€6/mo
- Unlimited event types
- Your branding
- All workflows & reminders
- Zero transaction fees
- Priority email support
- All current and future Pro features
LIFETIME
QUANTUM
£129
€149
- Pay once, use forever
- Everything in Photon
- Founder badge
- All future single-user features
- First 500 buyers: £99 / €119
- Capped at 5,000 buyers ever
SQUAD
ELECTRON
£7/user/mo
€8/user/mo
- Round-robin scheduling
- Collective availability
- Team workflows
- Shared event types
- Admin controls & reporting
- Per-seat billing via SEPA DD
COMPARE PLANS
SEE HOW WE STACK UP.
We've put ourselves up against every meaningful booking platform — Calendly, Cal.com, SavvyCal, Acuity, Doodle, TidyCal, YouCanBookMe, Chili Piper, and Microsoft Bookings. Each comparison is a full feature table. No marketing theatre.
LAUNCH · Q3 2026
FIRST 500 QUANTUM BUYERS GET FOUNDER PRICING: £99 FOR LIFE.
Join the waitlist. We'll email you when Photon goes live, and you'll have first dibs on the £99 Quantum tier before the price ratchets to £129.
We'll email you when Photon goes live. We don't spam, sell your address, or use trackers. Your email is stored on a Hetzner server in Frankfurt and you can ask us to delete it any time.
PART OF THE STRAUN GROUP
AN ATOMIC ENGINE PRODUCT. PART OF THE STRAUN GROUP OF COMPANIES.
Straun Group is a multidisciplinary infrastructure and technology group focused on renewable energy, digital transformation, and AI automation. Atomic Booking is the booking platform sibling to Atomic Engine, our AI workforce product.
Existing Atomic Engine customers get 25% off Photon and Electron with a verified linked account.