Best Calendar Software for Startups
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Compare the Top Calendar Software for Startups as of October 2026
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What is Calendar Software for Startups?
Calendar software helps individuals and organizations schedule, organize, and manage events, appointments, meetings, and tasks through digital calendars. These platforms provide tools for event creation, reminders, recurring schedules, availability management, and calendar sharing to improve time management and coordination. The software often includes features such as meeting scheduling, resource booking, notifications, synchronization across devices, and integrations with email, collaboration, and productivity applications. Many calendar solutions support team calendars, room reservations, workflow automation, and AI-powered scheduling assistance to streamline planning and collaboration. By centralizing scheduling and improving visibility into commitments, calendar software helps users increase productivity, reduce conflicts, and manage time more effectively. Compare and read user reviews of the best Calendar software for Startups currently available using the table below. This list is updated regularly.
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1
Proton Mail
Proton AG
Proton Mail is the simplest way to protect your communications with built-in end-to-end encryption. Prevent data breaches, stay compliant with regulations like GDPR and HIPAA, and earn client trust. Protected by Swiss privacy laws and trusted by over 50,000 businesses, Proton Mail keeps your business data confidential and under your control. With Proton Mail and Calendar, your team can securely manage their inbox and schedule, while your organization maintains a professional presence with support for custom email domains and personalized branding. And with the Easy Switch tool, migrating from Google or Microsoft is seamless, no IT expertise required.Starting Price: $6.99/user/month -
2
Google Workspace
Google
Google Calendar helps you stay organized by allowing you to schedule and manage events seamlessly across devices. Create and share calendars, set reminders, and invite participants with a few clicks. Integrated with Gmail, Calendar automatically adds events from your inbox and syncs with Google Meet for easy meeting scheduling. Whether coordinating with teams or managing personal appointments, Google Calendar makes it simple to stay on top of your schedule and collaborate effectively.Starting Price: $7/user/month -
3
Bordio
Bordio
Bordio is a comprehensive project management software that integrates team management software, task management tools, and a project planning calendar all in one platform. It brings together everything teams need to get their work done, from setting up projects with a project planner and organizing tasks on a kanban board, to collaborating with team members using a task board. The platform provides a clear view of what needs to be done each day with its online calendar, making overwhelming to-do lists a thing of the past. With features for scheduling tasks on specific days and keeping track of progress with color-coded statuses, Bordio keeps teams focused and acts as an effective project tracker and task tracker. You can invite guests like clients or freelancers into projects at no extra cost and work together seamlessly. The inclusion of a team task planner and team tracker ensures that every member’s efforts are synchronized and visible.Starting Price: $5.99 per user per month -
4
Microsoft Outlook
Microsoft
Microsoft Outlook is the all-in-one email, calendar, and contact management platform designed to keep you organized and connected across your digital life. With Outlook, you can manage multiple accounts—including Gmail, Yahoo, and iCloud—within one unified inbox. Intelligent scheduling tools and shared calendars help you stay on top of meetings, events, and personal reminders. The built-in Microsoft Copilot assists with writing emails, summarizing long threads, and managing tasks to boost productivity. Outlook also offers enterprise-grade security, filtering out spam, phishing, and malware to keep your data safe. Whether on desktop, mobile, or web, Outlook helps you manage communication and time with clarity and confidence. -
5
Calendly
Calendly
Calendly is a scheduling automation platform that helps individuals, teams, and enterprises book meetings without the back-and-forth emails. Share custom booking links, set availability preferences, and automate reminders, follow-ups, and calendar syncing. Calendly supports one-on-one, group, collective, and round robin scheduling, with smart features like buffer times, time zone detection, and meeting caps. Integrate with Google, Outlook, Office 365, Zoom, Microsoft Teams, HubSpot, Salesforce, Slack, and more to embed scheduling into your existing workflow. Calendly helps entrepreneurs, sales, marketing, recruiting, customer success, and professional services teams save time, reduce no-shows, and improve the client experience. Built for flexibility and scale, Calendly offers admin controls, reporting, and enterprise-grade security. Sign up for free and simplify your scheduling today—no credit card required.Starting Price: $10 per user per month -
6
Google Calendar
Google
Google Calendar is an AI-powered online calendar platform designed to help individuals and teams schedule events, organize tasks, and manage time more efficiently. The platform integrates seamlessly with Google Workspace applications such as Gmail, Meet, and Tasks, allowing users to coordinate meetings, track responsibilities, and manage schedules from one centralized location. Google Calendar includes AI-powered scheduling tools through Gemini that help users quickly find meeting times, add events from emails, and simplify appointment booking. Users can share calendars, attach files to events, set working hours and locations, and collaborate with teams more effectively across projects and meetings. The platform also supports automatic reminders, task synchronization, multiple calendar views, and video conferencing integration with Google Meet for smoother communication and planning.Starting Price: $0 -
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Thunderbird
Mozilla Foundation
Thunderbird is a free email application that’s easy to set up and customize - and it’s loaded with great features! Thunderbird makes email better for you, bringing together speed, privacy and the latest technologies. Focus on what matters and forget about complexity. Multiple features, such as built-in Do Not Track and remote content blocking, work together to ensure your safety and privacy, so you can have peace of mind. With Add-ons (Extensions & Themes) and many more features you can change the look and feel of Thunderbird in an instant. Organize your schedule and life’s important events in a calendar that’s fully integrated with your Thunderbird email. Manage multiple calendars, create your daily to do list, invite friends to events, and subscribe to public calendars. Thunderbird is an open source project, which means anyone can contribute ideas, designs, code, and time helping fellow users. -
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