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One Calendar

One Calendar

All calendars in ONE place!

21K ratings
831 reviews
📊 Productivity
Free
In-App Purchases

Details

Released
May 1, 2018
Updated
September 19, 2026

Features

Developer

Code Spark
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iphone
ipad
🧾$5.99
In-App Purchase↘︎
📌Ready
Reviews summary↘︎
⭐831
Reviews↘︎
📝23+ tags
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🔄6+ apps
Alternatives↘︎
❓5 answered
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📦~ in 2 weeks
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About

Consolidate all your digital calendars into a single, easy-to-read view. Manage appointments, events, and birthdays from various providers like Google, Outlook, iCloud, and more, all within one application.

✓Integrates multiple calendar providers
✓Easy-to-read overview
✓Manage appointments and events
✓View birthdays
✓Cross-platform availability
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What users say about One Calendar

Reviews of One Calendar are mostly positive: the Productivity app is rated 4.8/5 from 21K App Store ratings. What users like most: easy to use, clean and simple interface. Top complaints: syncing issues, bugs and glitches. Summarized from real user reviews.

Positive things

  • 🚀Easy to use
  • 👍Clean and simple interface
  • 👍Integrates multiple calendars
  • 🚀Syncs across devices
  • 👍Customizable colors and themes
  • 👍Helpful for organizing schedules

Negative things

  • 🐛Syncing issues
  • 🐛Bugs and glitches
  • 🔒Lacks security features
  • 🔋Drains battery
  • 👎Restrictive features in free version
See all reviews

What's New in One Calendar

10.100.11

September 19, 2026

Fix iOS 26/27 freeze/hang issues

1

Subscriptions & In-App Purchases

$5.99

OneCalendar premium

OneCalendar premium license

User reviews

Most RecentHighest RatedLowest Rated

Cross Platforms

Very annoyed that I have to purchase premium usage on each platform I use (ie: paying to use premium on my PC and paying again to use it on my iPhone)
PPPay for every platform

One Calendar app

One of the best calendar apps and it just works. Used many and this bar far works the best with lots of features
JJuniorz2024

Fabulous calendar

This easy to use calendar syncs everywhere and a wonderful way for a family to share a calendar.
Team/App support is unprecedented and beyond amazing.
JHJim Hartman

iOS 27

No longer allows events to be added since iOS 27. Hopefully the developer will release an update soon.
Ffeyuydeghh

Stopped working

Always loved this but hurry up and fix it, won’t work with the new IOS27 I’m now unable to add any appointments
Llozeeb
See 826 more reviews

Developer apps

One Tasks
One Tasks

Manage your tasks & todo lists

📊 Productivity

(274)

Free
See developer apps

User experience

🐞

Reported Bugs

5 issues

Sync errors

Bug

Unresponsive buttons

Bug

Incorrect time zone display

Bug

Duplicate events

Bug

Inability to delete future occurrences of recurring events

Bug
✨

Requested Features

6 requests

Multiple reminders for events

Feature

Ability to edit recurring events

Feature

Option to change event calendar after creation

Feature

Printing support

Feature

More customization options

Feature

Widgets for better visibility

Feature

FAQ

What does One Calendar do?

One Calendar is an application designed to bring all your digital calendars into one centralized and easy-to-read overview. It allows you to view and manage appointments, events, and birthdays from various calendar providers.

Which calendar services does One Calendar support?

The app supports a wide range of popular calendar services including Google, Live, Outlook, iCloud, Exchange, Office365, Yahoo, Nextcloud, Synology, GMX, Mailbox.org, and ownCloud, among others.

Is One Calendar free to use?

The application is free to download and use, with the option for in-app purchases. This means core functionality is available without cost, but certain enhancements or features might require a purchase.

What platforms is One Calendar available on?

One Calendar is designed to be available on all platforms, ensuring users can access and manage their consolidated calendars regardless of their device.

How does One Calendar help manage my schedule?

By integrating all your calendars, it provides a single interface to see all your commitments, appointments, and important dates. This unified view helps prevent scheduling conflicts and simplifies the management of your daily, weekly, and monthly plans.