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


Breely is described as 'The most flexible online booking system, allowing you to build the exact appointment and class scheduling, forms, and workflows for your business' and is an app in the office & productivity category. There are more than 10 alternatives to Breely for a variety of platforms, including Web-based, SaaS, Android, iPhone and Self-Hosted apps. The best Breely alternative is Thunderbird Appointment, which is both free and Open Source. Other great apps like Breely are Notion Calendar, Cal.com, Lunacal and OurCal.
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.




Open-source scheduling tool offering self-hosted or hosted deployment, complete white-label branding, API-driven customization, data ownership, online booking management, flexible embedding, privacy, and integration for business meetings, seminars, and more.




Cloud-based scheduling platform featuring customizable booking pages, synchronization with major calendars, automated SMS and email reminders, team scheduling, support for paid sessions, location and service management, CRM connectivity, and GDPR compliance.




This app is tailored for families, couples, friends, and groups, providing end-to-end encryption for secure data, seamless calendar creation, syncing, private chats, and widgets for easy access, ensuring you never miss an event.




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.




Easy!Appointments is a highly customizable web application that allows your customers to book appointments with you via the web. Moreover, it provides the ability to sync your data with Google Calendar so you can use them with other services.




zcal is all-in-one scheduling solution built for speed. It’s beautiful, easy to use, and fully integrated with Google, Office 365, and Outlook calendars. Sign up for free today!



Undock is a scheduling platform that integrates with Gmail, Outlook 365, Superhuman, LinkedIn, and Twitter. It functions as a calendar assistant, allowing you to share times or your entire calendar. It also enables instant meeting scheduling without checking your calendar.



Online platform providing 24/7 self-service booking for virtual classes, staff and resource scheduling, automated reminders, online payments, marketing automation, social media integration, deals, reviews, analytics, and calendar sync for engagement.



Check out Calday for the most flexible appointment scheduling app for service-based business! Easily manage your appointments with hassle-free scheduling.



