Calendar.online
What Calendar.online is
Calendar.online is a shared calendar for teams, families, clubs, schools, practices, companies, and duty rosters. Calendars are opened through links, so people can view or edit without logging in; each link can have its own read or write permission. Colored sub-calendars help separate schedules, with access configured for each link. A booking function shows visitors only available appointment slots. Email or text reminders can cover appointments, while daily or weekly agenda reminders arrive by email. Events can be imported and exported, including iCalendar files. Depending on the subscription, imports run from once daily to every fifteen minutes. The Basic plan includes integration with a personal website, and the Premium API can connect the service to other systems such as Make.com. Calendar.online offers web access, iOS and Android apps, one-way calendar sync, shared calendars, and scheduling links. The maker is based in Düsseldorf, Germany, and presents the service as GDPR compliant, with German servers and anonymous IP storage.
Who it suits
It suits groups that need shared schedules, link-based permissions, appointment booking, and reminders. It also fits organizations wanting website integration or API connections.
What it does well
- Free plan available forever
- Shared calendars with configurable link permissions
- Booking shows only available time slots
- iOS and Android apps
- Email and text appointment reminders
What to know first
- Basic limits sub-calendars and access links
- Calendar sync works one way
- Premium API requires Premium plan
- Paid plans billed monthly
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Basic | Free forever · Up to 6 sub-calendars · Up to 3 access links · Unlimited users · 1 booking product/link · 1 year of historical data | Free |
| Premium | Per calendar per month, including VAT; $11.92/month for annual payment · Unlimited sub-calendars · Unlimited access links · Unlimited booking products/links · Unlimited historical data | $14.90 a month |
| Plus | Per calendar per month, including VAT; $5.52/month for annual payment · Up to 20 sub-calendars · Up to 10 access links · 5 booking products/links · 5 years of historical data | $6.90 a month |
As calendar.online lists them, read 9 Oct 2026. The maker's own page has the final word.
Verdict
Calendar.online combines shared calendars, booking links, reminders, and permission controls in one service. The free Basic plan covers smaller setups, while Plus and Premium expand calendar, link, booking, and history limits.
Facts from Calendar.online's own pages
- Access and sharing
- Users can access calendars through links without logging in, with individually configurable permissions such as read or write. · calendar.online, 9 Oct 2026
- API and integration
- The Premium API can connect Calendar.online to other systems, with Make.com (Integromat) given as an example. · calendar.online, 9 Oct 2026
- Booking
- The booking function lets interested parties and customers book appointments in the calendar, offering only available time slots. · calendar.online, 9 Oct 2026
- Calendar sync
- one_way · calendar.online, 22 Sept 2026
- Company history and location
- The maker says it founded German-language Kalender.digital in 2019 and Calendar.online in 2020; its contact information lists Düsseldorf, Germany. · calendar.online, 9 Oct 2026
- Founded
- 2020 · calendar.online, 28 Sept 2026
- Free plan
- Yes · calendar.online, 22 Sept 2026
- Headquarters
- Düsseldorf, Germany · calendar.online, 28 Sept 2026
- Imports and exports
- Calendar.online supports event import and export, including iCalendar, and import intervals vary by subscription from daily to every fifteen minutes. · calendar.online, 9 Oct 2026
- Intended users
- The maker describes the calendar as suitable for individuals and groups including families and teams, and lists uses such as company, practice, club, school, and duty-roster calendars. · calendar.online, 9 Oct 2026
- Mobile apps
- Apps are available for Android, iOS, and macOS, with appointment synchronization between the apps and web version. · calendar.online, 9 Oct 2026
- Privacy and compliance
- The maker states that Calendar.online is GDPR compliant, its servers are in Germany, IP addresses are stored anonymously, and data is not passed to or sold to third parties. · calendar.online, 9 Oct 2026
- Purpose
- Calendar.online is presented as a calendar for teams and groups to organize, plan, and share appointments. · calendar.online, 9 Oct 2026
- Reminders
- The service offers appointment reminders by email or text message, plus daily or weekly agenda reminders by email. · calendar.online, 9 Oct 2026
- Scheduling links
- Yes · calendar.online, 22 Sept 2026
- Security
- The maker says access links use 20-character hexadecimal codes, unauthorized access is recorded, and corresponding IP addresses are blocked. · calendar.online, 9 Oct 2026
- Shared calendars
- Yes · calendar.online, 22 Sept 2026
- Sub-calendars
- Calendars can be organized into colored sub-calendars, with readable and writable sub-calendars configured for each access link. · calendar.online, 9 Oct 2026
- Support contact
- The maker lists [email protected] as its contact email. · calendar.online, 9 Oct 2026
- Website integration
- The Basic plan includes integration into a user's own website. · calendar.online, 9 Oct 2026
Where Calendar.online stands on Freedom251
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