US-incorporated open-source Calendly alternative (Cal.com Inc, SF) founded by EU developers; production code moving closed-source in 2026.
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A single roll-up of ownership and CLOUD Act exposure.
Brno-based Czech booking platform (Reservio s.r.o., ABUGO Group), 500k+ businesses, freemium with branded customer apps.
Reservio, in the Calendar booking category, is a European service with Czechia as its hosting location and at most minor, transient US exposure under the CLOUD Act.
Reservio s.r.o. (Brno, Czech Republic; incorporated 6 November 2012; member of the ABUGO Group) is a Czech online booking platform serving 500,000+ businesses and 21M+ clients annually with a freemium model: scheduling calendar, POS, client and team management, branded customer apps, and SMS / email reminders. CDN delivery via CDN77 (Czech-incorporated CDN provider, ultimately owned by Datacamp Limited in Cyprus) keeps the asset layer EU-domiciled. Signal mix: EU-owned (Czech B2B holding group, no PE/VC chain visible), CLOUD Act flag at minor; gaps: the underlying customer-data hosting provider, a publicly accessible DPA artefact, and a named sub-processors list are not captured at audit; vendor outreach required before procurement-grade listing.
How exposed customer data is to US authorities under the CLOUD Act (Clarifying Lawful Overseas Use of Data Act).
Where ultimate control over the operating company sits.
Reservio is a Brno-headquartered Czech online appointment-scheduling platform operated by Reservio s.r.o. and a member of the ABUGO Group. Incorporated on 6 November 2012, the company has scaled to 500,000+ businesses on the platform with 21M+ clients and 20M+ bookings per year, large enough to be a serious B2C booking marketplace in Central and Eastern Europe alongside being a B2B scheduling tool. The product surface covers scheduling calendar, online booking website, POS, client management, team management, mobile apps (iOS/Android), SMS and email reminders, online payments, and an optional branded customer app (white-label mobile app) for businesses on higher tiers. The freemium model unlocks the scheduling calendar, booking website, client management, team coordination, and integrated POS without payment.
For an EU-sovereignty audit Reservio is a clean Czech ownership story: no PE / VC chain visible, member of the ABUGO Group (Czech corporate holding), 10–19 employees with about a third remote. CDN delivery is via CDN77 (a Czech-incorporated CDN provider, ultimately part of Datacamp Limited in Cyprus); Czech and Cypriot incorporations are both inside the EU so the asset layer is EU-domiciled. Where the listing weakens is procurement-grade documentation: the customer-data hosting provider, a unified DPA artefact, and a named sub-processors list are not directly captured at audit; vendor outreach is needed to surface the canonical URLs before publishing for procurement-led buyers.
Best fit: Czech, Slovak, Polish, Hungarian, and broader CEE small and medium service businesses (beauty salons, fitness clubs, language schools, medical practices, equipment rentals); EU SMBs that benefit from Reservio's white-label customer-app option; multilingual booking pages across the CEE language belt. Procurement-grade EU-only buyers requiring formal contract documents should request the DPA, sub-processors list, and hosting region directly before signing.
US-incorporated open-source Calendly alternative (Cal.com Inc, SF) founded by EU developers; production code moving closed-source in 2026.
Nottingham UK developer-API-first calendar / scheduling platform (Cronofy, founded 2013), ISO 27001 + SOC 2; Wise / GoCardless / Indeed customers.
Swiss group-scheduling pioneer (Doodle AG, Zurich, 2007), owned by TX Group (SIX-listed Swiss media holding); SOC 2 + GDPR + HIPAA.