Thunderbird Appointment makes it easy to find a time to meet. So you can ditch the admin and streamline your day.


The best Appointment Scheduler alternative to Calendar.online is Thunderbird Appointment, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to Calendar.online and ten of them are Appointment Schedulers so hopefully you can find a suitable replacement. Other interesting Appointment Scheduler alternatives to Calendar.online are Notion Calendar, Amie, Calendly and TidyCal.
Thunderbird Appointment makes it easy to find a time to meet. So you can ditch the admin and streamline your day.


Experience a fully integrated calendar with Notion, syncing events from Google Calendar, offering built-in scheduling, time zone support, and the ability to connect multiple accounts. Manage all events, personal and work, with a modern design, light and dark modes, and Lock Screen support for iOS 17.




Amie is a productivity application that facilitates task, event, and contact management, integrating a scheduling feature for task and event time allocation, and effectively transforming the calendar into a todo list, with color-coding for improved organization and visual...




Calendly can connect with up to six of your calendars to automatically check availability and help you connect with your best contacts, prospects and clients.




Web-based scheduling platform offering unlimited meeting booking types, seamless calendar, video conferencing, and payment integrations, cross-timezone support, easy setup, embeddable booking pages, API automations, mobile-friendly interface, and notifications.




Modern, design-focused scheduling offers branded booking with image or video backgrounds, integrates with Google and Outlook, prevents double-bookings, auto-generates meet links, and features reminders, multiple durations, custom fields, and high-end visuals for creative professionals.




Tymeslot is an open-source meeting scheduling platform built with Elixir and Phoenix LiveView. Deploy it on your own infrastructure or let us run it for you — either way, your data stays yours.



Use your time efficiently by speaking to people when it is convenient for both of you, without scheduling a meeting. TAG allows you to make and receive calls only when you actually have the time to do so.




Open your office 24/7 and manage your appointments with a solution tailored for agents and agencies. Share booking link with potential buyers, track visits, and never miss an opportunity.



Bookable is a powerful scheduling platform designed to make appointment management effortless for small businesses, freelancers, and professionals. With its intuitive interface and seamless integration with popular calendar tools like Google Calendar, iCloud Calendar, and...
