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One Calendar

One Calendar

4.7
Rating
1,000,000+ Downloads
6.901.0 Version
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Information

  • Category: Productivity
  • Price: free
  • Age Rating: Everyone
  • Available on: /
  • Developer: Code Spark
  • Updated on: Nov 28, 2025
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Introducing the "One Calendar" app, your all-in-one solution for seamless scheduling and organization. Effortlessly integrate multiple calendars, manage events, and set reminders in a user-friendly interface. With customizable features and real-time syncing, stay on top of your commitments whether at work, home, or on the go. Experience the convenience of having your entire schedule at your fingertips, ensuring you never miss an important date again. Simplify your life with One Calendar today!

Features & Highlights

One Calendar is a versatile scheduling tool that brings together various calendar functionalities into a single, user-friendly interface. Here are some of its standout features:

  • Unified Calendar View: One Calendar allows you to sync multiple calendars from different platforms, such as Google, Outlook, and Apple Calendar. This means you can see all your appointments in one place, making it easier to manage your time. For instance, I often juggle work meetings and personal events, and having everything in one view has significantly reduced my scheduling conflicts.
  • Customizable Reminders: The app offers a robust reminder system that lets you set alerts for upcoming events. You can choose how far in advance you want to be notified, whether it’s a day, an hour, or even a few minutes before. I’ve found this feature particularly useful for remembering important deadlines and meetings, ensuring I’m always prepared.
  • Intuitive User Interface: One Calendar boasts a clean and intuitive design that makes navigation a breeze. The layout is straightforward, allowing users to quickly add events or check their schedules without any hassle. I appreciate how easy it is to switch between daily, weekly, and monthly views, which helps me plan my time effectively.
  • Task Management Integration: The app seamlessly integrates task management features, allowing you to create to-do lists alongside your calendar events. This has been a game-changer for me, as I can now prioritize my tasks and schedule them directly into my calendar, ensuring I stay on top of my responsibilities.
  • Color-Coding Options: One Calendar allows users to color-code their events, making it visually easier to differentiate between work, personal, and social commitments. I use this feature to quickly glance at my day and see where my time is allocated, which helps me maintain a balanced schedule.

Real Experience Using "One Calendar"

Application Scenarios

As a busy professional balancing work and personal life, I rely heavily on One Calendar to keep everything organized. For instance, during the week, I use it to track my work meetings, deadlines, and project milestones. On weekends, I switch gears to manage family events, social gatherings, and even my workout schedule. The ability to view everything in one place has been invaluable, especially when planning for busy weeks ahead. I often find myself adding events on the go, whether I’m at my desk or out running errands, and the app’s mobile functionality ensures I never miss a beat.

User Experience

The user interface of One Calendar is one of its strongest points. Upon opening the app, I’m greeted with a clean layout that feels modern and inviting. Navigating through the different views—daily, weekly, and monthly—is smooth, and I appreciate the quick access to add new events. The performance is stellar; I’ve never experienced lag or crashes, even when syncing multiple calendars. Adding events is straightforward, and the customizable reminders ensure I’m always alerted in a timely manner. Overall, my experience has been overwhelmingly positive, as the app has made managing my schedule less stressful and more efficient.

Pricing

One Calendar offers a free version with essential features, which is great for casual users. However, for those who want to unlock premium features like advanced task management and additional customization options, there’s a subscription model available. The pricing is competitive compared to other calendar apps, and I find the investment worthwhile given the productivity boost it provides.

Updates & Support

The developers of One Calendar are proactive in providing updates, which often include new features and performance enhancements. I’ve noticed regular improvements that enhance usability and fix any minor bugs. Customer support is also commendable; I reached out with a question about syncing issues, and they responded promptly with helpful guidance. This level of support gives me confidence in the app’s reliability.

Security & Privacy Review

As an American user, security and privacy are paramount when it comes to using apps like One Calendar. The app is available on both the App Store and Google Play, which adds a layer of credibility. During the registration process, I was required to provide minimal personal data, which I appreciated. The app does not bombard users with ads, and I have not noticed any intrusive tracking behavior, which is a significant plus for me. Overall, I feel secure using One Calendar, knowing that my data is handled responsibly and that my privacy is respected.

Pros
  • One Calendar integrates multiple calendars seamlessly for easy management.
  • It offers customizable views to suit your scheduling needs.
  • Real-time collaboration keeps teams aligned and informed effortlessly.
  • Smart reminders help you stay on top of important events.
  • The user-friendly interface makes navigation simple and intuitive.
Cons
  • Limited integration with other apps can hinder overall productivity.
  • User interface may feel overwhelming for new users.
  • Syncing issues can lead to missed appointments and confusion.
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User Reviews

(64.2K Reviews)
  • Araina Schreckengost
    2026/06/22

    Works well and easy to use. I have been using this for over 5 years and this has been a lifesaver for scheduling appointments. So far it has been better than using a paper calendar. When I have to change a date or time it is easy to go in and make the edits without having to erase or even use whiteout. I like that it gives you the option to have the calendar remind you in advance when your appointment starts or when your event is starting.

  • Jordan Roath
    2026/04/25

    It's a fine calendar, but there are some usability hurdles. When launching the app by clicking on the widget, it will often launch the app in the last place you left off rather than the event you select on the widget. Also there's no assistance when entering addresses onto events. And to open a map with an event's location, you need to be in edit mode on the event.

  • Brent Straley
    2026/05/27

    Definitely the most reliable calendar app out there. Just one thing would make this app way above others. If you were to add a scrollable day slot in month view instead of putting +2 for more events in one of your next up dates, that would be so helpful. Everyday has more than 4 events on my calendar. Having to click on the day spot then having to click out of the day spot makes it easy to miss events because I have to click on everyday to make sure i am not missing any events. 🙏 👍

  • A Google user
    2018/11/19

    Works well to sync Google calendar, Outlook and Windows 10 calendar apps. I haven't tried it with others. Syncs best if you enter the appointment in One calendar first. It doesn't always pick up entries that you put into other calendars. If you have multiple calendar apps on your phone, tablet or computer, it will result in multiple reminders. I don't know how to get around that. For reminders from OneCalendar you have to go into the calendar entry to change the reminder time. I have not found a simple way to delay the reminder when it appears. If you are out of cell coverage, calendar is slow to load because it cannot sync.

  • Noah D (NoahD)
    2024/08/17

    I've been looking for a calendar app that works with my self hosted Nextcloud server (version 29). The app is incredibly easy to use and setup. Very simple GUI which is exactly what I want. I haven't had it long enough to see if the notifications work or not but it does sync without issues to and from my Nextcloud server. Very impressed so far. Also, I looked around the app to see if there is a donate or send me a beer/coffee but didn't see one as I want to send them few bucks.

Review Source: Google Play store public user reviews.

FAQ

Can I submit suggestions or feedback to One Calendar?

Yes, One Calendar encourages users to submit suggestions and feedback through their support channels, allowing for continuous improvement of the app.

Does One Calendar collect my personal data?

One Calendar prioritizes user privacy and does not collect personal data without consent, but users should review the app’s privacy policy for detailed information.

Does One Calendar support offline use?

Yes, One Calendar allows users to access their calendars and view events even when offline, though some features may require an internet connection.

How do I cancel my One Calendar subscription?

Users can cancel their One Calendar subscription through their account settings within the app or by following the cancellation instructions provided in their app store.

How much does a subscription to One Calendar cost?

The subscription cost for One Calendar varies based on the selected plan, typically offering monthly and yearly options at competitive rates.

How to use One Calendar

Can I change my customer number?

Unfortunately, customer numbers cannot be changed. If you have any concerns, please reach out to customer service for further assistance.

Can I update my email address after logging in?

Yes, you can update your email address in your account settings once you are logged in. Ensure to save the changes.

How can I contact customer service for One Calendar?

You can reach our customer service by emailing support

How do I activate my One Calendar account?

To activate your account, click the activation link sent to your email after registration. If you didn't receive it, check your spam folder or contact customer service.

How do I log in to my One Calendar account on a new device?

Simply enter your registered email and password on the One Calendar login page. If you encounter issues, ensure your credentials are correct.

What's New

  • Minor fixes, CalDAV improvements
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