cale-dev.de

What It Is

Calendar.online is an online shared calendar designed for teams, families, and organizations. Its biggest differentiator is that members do not need to register or log in. Instead, they access the calendar through different links, with read, edit, and admin permissions controlled per link. This makes it well suited to lightweight collaboration scenarios where you do not want to create accounts for every participant.

Core Features and Collaboration Permissions

The product supports color-coded sub-calendars for distinguishing projects, people, rooms, or business categories. Each access link can also be configured with separate read and write access to specific sub-calendars. The system offers link modes such as administrator, editor, and reader, and password protection is available from the Plus plan onward. For reminders, it supports email, SMS, daily/weekly agendas, and change notifications. Its booking feature lets customers directly select available time slots, making it useful for clinics, classes, venue reservations, and service appointments.

Integrations, Deployment, and Security

Calendar.online is a cloud-based SaaS product; the source text does not mention self-hosting. It supports website embedding, as well as import and export with Outlook, Google Calendar, and Apple Calendar via iCalendar feeds/ICS files, though synchronization depends on the refresh behavior of the third-party calendar service. On security and compliance, the service states that it is GDPR-compliant, uses servers located in Germany, stores IP addresses anonymously, and does not sell or pass on data. Access links are 20-character random strings, and the system can log unauthorized access attempts and block related IP addresses. The Premium plan includes API access, but no further developer details are disclosed.

Pricing, Pros, and Cons

The Basic plan is permanently free and supports up to 6 sub-calendars, 3 access links, and unlimited users, offering strong value. Plus costs US$6.90 per calendar per month and adds stronger password protection, reminders, and more frequent imports. Premium costs US$14.90 per calendar per month and unlocks unlimited links, attachments, Excel features, SMS, white labeling, custom logos, and API access. Its strengths are ease of use, reasonably granular permissions, and a usable free tier. Downsides include the concentration of advanced features in Premium, the need to manage link-based access carefully, and the fact that external calendar sync is not fully real-time or entirely under the product’s control.

Who It’s For and Access from China

Calendar.online is suitable for small and midsize teams, families, schools, clubs, clinics, duty rosters, holiday planning, room scheduling, course timetables, and similar use cases. The source text does not provide information on access from mainland China, and payment methods are not disclosed. If access or payment is limited, local alternatives such as Feishu Calendar, WeCom schedules, and Tencent Meeting schedules may be worth considering, alongside international tools such as Google Calendar, Outlook Calendar, and Calendly.