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


InviteOnce is described as 'In-the-funnel scheduling solution designed to move prospects faster through the funnel by optimizing scheduling for each meeting scenario' and is a appointment scheduler in the office & productivity category. There are more than 25 alternatives to InviteOnce for a variety of platforms, including Web-based, SaaS, iPhone, Android and Android Tablet apps. The best InviteOnce alternative is Thunderbird Appointment, which is both free and Open Source. Other great apps like InviteOnce are Doodle, Supercal, Calendly and TidyCal.
Thunderbird Appointment makes it easy to find a time to meet. So you can ditch the admin and streamline your day.


Doodle is the worlds leading online scheduling tool with a rapidly growing user base of more than three million unique visitors per month across the globe. It takes the pain out of finding the right date and time for a group of people to meet and makes scheduling virtually...



Coordinate meetings by emailing an AI assistant that syncs with up to 6 calendars, supports group or one-on-one events, creates unlimited custom booking links, gathers meeting details through forms, manages timezones, and sends automated reminders.


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.




Topmate is a tool that connects creators and experts with their audience through one-on-one sessions, allowing users to share knowledge and monetize their time. Users create a personal link, list services, set availability, and establish charges, which followers can use to book...




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.



MyMeet.io simplifies scheduling, payments, and meeting handling for both professionals and clients, streamlining the entire process.




Appointment scheduling/booking application that aims to be super-simple, and open source!




Schedule meetings in an easy way Planist can connect with your google calendar to automatically check availability and help you connect with your best contacts, prospects, and clients.




SimplyMeet.me is a super simple, clean looking and effective meeting scheduling solution. It can integrate with your Gmail, iCAL, Offfice365 or CalDav calendars, your favorite Video platform, Stripe to accept payments and more.


