Calendar.online

Web · Android · iPhone · API · paid plans from $6.90/mo

Freedom report

Three barsScore 7.3

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely3 of 6 device platforms
DocumentedPlans, terms and facts published

Calendar.online is ranked #43 of 197 in calendar apps on Freedom251, made by Calendar.online (Düsseldorf, Germany). It runs on Android, API, iOS, Web. There is a free plan. Paid plans start at $6.90/mo.

Calendar.online plans and pricing

All plans

Basic Free Free forever 6 sub-calendars · 3 access links · 1 booking product/link · 1 year historical data calendar.online · 22 Sept 2026

Plus $6.90/mo Prices include VAT 20 sub-calendars · 10 access links · 5 booking products/links · 5 years historical data calendar.online · 22 Sept 2026

Premium $14.90/mo Prices include VAT Unlimited sub-calendars · Unlimited access links · Unlimited booking products/links · Unlimited historical data calendar.online · 22 Sept 2026

Basic Free Free forever Up to 6 sub-calendars · Up to 3 access links · Unlimited users · 1 booking product/link · 1 year of historical data calendar.online · 9 Oct 2026

Plus $6.90/mo 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 calendar.online · 9 Oct 2026

Premium $14.90/mo 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 calendar.online · 9 Oct 2026

Compared on calendar apps

Free plan: Yes
Shared calendars: Yes
Scheduling links: Yes
Calendar sync: one_way
Mobile apps: ios and android

Best Calendar.online alternatives

See all 20

Three bars Mozilla Thunderbird Free tierOpen source No. 1Free9.0 Two bars Microsoft Outlook Calendar Free tier No. 2$1.67/mo8.2 Two bars Lark Free tier No. 3Free8.2 Two bars EGroupware Open source No. 4€21.90/mo8.2 One bar Proton Calendar Free tier No. 5Free8.0 Two bars Teamup Free tier No. 6$12/mo8.0

The record

Purpose: Calendar.online is presented as a calendar for teams and groups to organize, plan, and share appointments.
Access and sharing: Users can access calendars through links without logging in, with individually configurable permissions such as read or write.
Sub-calendars: Calendars can be organized into colored sub-calendars, with readable and writable sub-calendars configured for each access link.
Booking: The booking function lets interested parties and customers book appointments in the calendar, offering only available time slots.
Reminders: The service offers appointment reminders by email or text message, plus daily or weekly agenda reminders by email.
Imports and exports: Calendar.online supports event import and export, including iCalendar, and import intervals vary by subscription from daily to every fifteen minutes.
Website integration: The Basic plan includes integration into a user's own website.
API and integration: The Premium API can connect Calendar.online to other systems, with Make.com (Integromat) given as an example.
Security: The maker says access links use 20-character hexadecimal codes, unauthorized access is recorded, and corresponding IP addresses are blocked.
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.
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.
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.
Support contact: The maker lists [email protected] as its contact email.
Founded: 2020
Price from: $6.90/mo

Where it ranks on Freedom251

Best Calendar Apps in 2026#43 of 197

Is Calendar.online yours?

Claim it for free: prove the domain, then correct facts, plans and screenshots. An editor reviews every change.

Claim it free Promote Calendar.online

Sources

calendar.online· checked 9 Oct 2026
calendar.online/c/pricing· checked 9 Oct 2026
calendar.online/c/documentation/api· checked 9 Oct 2026
calendar.online/c/about· checked 9 Oct 2026
calendar.online/c/pricing· checked 22 Sept 2026