Calendar. Simple Calendars vs One Calendar
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calendar. Simple Calendars
Organize your schedule across Apple devices with a user-friendly interface. Customize with color themes, view week numbers, and use interactive widgets to manage your day, month, and year efficiently.
- Cross-platform sync (Mac, iPhone, iPad)
- Interactive home screen widget
- Customizable color themes
- Week number display option
- Intuitive user interface
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Cross-Platform Convenience: Just Calendar seamlessly integrates with your Mac, iPhone, and iPad, providing a consistent and user-friendly calendar experience across all your Apple devices. Interactive Widget: Say goodbye to the hassle of opening your calendar app just to check the date. With Just Calendar, you can enjoy an interactive widget that allows you to switch between months directly from your home screen. Personalized Color Themes: We understand that everyone has their own style and preferences. Just Calendar offers six vibrant accent colors to choose from, so you can customize your calendar to match your personality or mood. Make your calendar as unique as you are. Week Number Display: Stay organized and plan your weeks effectively with the option to show or hide week numbers. Whether you rely on week numbers for work or simply find them helpful for your personal planning, Just Calendar gives you the flexibility to decide. User-Friendly Design: Just Calendar boasts an intuitive and user-friendly interface that makes managing your schedule a breeze. Whether you're a seasoned calendar pro or just getting started, our app is designed to be accessible and easy to use. Stay Organized, Stay in Control: Just Calendar empowers you to take charge of your schedule and stay organized with ease. Experience the convenience of a cross-platform calendar app that caters to your unique needs.
One Calendar
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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The most popular app to view all your calendars like Google, Live, Outlook, iCloud, Exchange, Office365, Yahoo, Nextcloud, Synology, GMX, Mailbox.org, ownCloud and more. OneCalendar integrates all your calendars into an easy-to-read overview. View and manage all your appointments, events and birthdays. OneCalendar is available on all platforms.
Screenshots
Verdict
The clearest difference is price: One Calendar at Free against Calendar. Simple Calendars's $1.99. One Calendar also leads on ratings volume (21K vs 2) and review sentiment (81% vs 68%). Calendar. Simple Calendars's advantage is in-app purchases (none vs 1) and rating (5.0 vs 4.8). On ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
One Calendar is free to download; Calendar. Simple Calendars costs $1.99 up front. One Calendar sells 1 one-off in-app purchase. Calendar. Simple Calendars asks for nothing beyond the download.
Calendar. Simple Calendars holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: One Calendar has 21K ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 68% of Calendar. Simple Calendars's written reviews are positive against 81% of One Calendar's, so the app with the better star average is not the one people write more warmly about.
Calendar. Simple Calendars ships an update monthly, One Calendar fortnightly. The most recent releases landed on September 17, 2026 and September 24, 2026 respectively.
| Parameter | Calendar. Simple Calendars | One Calendar |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 5.0 (2 ratings) — better | 4.8 (21K ratings) |
| Positive reviews | 68.4% of reviews | 80.7% of reviews — better |
| Number of ratings | 2 | 21K — better |
| Update frequency | Monthly | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Best chart rank | #188 — better | — |
| Devices | iPhone, iPad, iPod, Mac | iPhone, iPad, iPod, Mac |
| Requires iOS | 14.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 7 MB | 89 MB |
| Age rating | 4+ | 12+ |
| Developer | Vitaly Kuz'menko | Code Spark |
Customer experience
Calendar. Simple Calendars
One Calendar
Bugs and requests
Calendar. Simple Calendars
Not enough reviews yet to summarise bugs or requests.
One Calendar
Reported bugs
5 issues- Sync errors
- Unresponsive buttons
- Incorrect time zone display
- Duplicate events
- Inability to delete future occurrences of recurring events
Requested features
6 requests- Multiple reminders for events
- Ability to edit recurring events
- Option to change event calendar after creation
- Printing support
- More customization options
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- Widgets for better visibility
In-app purchases
Calendar. Simple Calendars
No in-app purchases
One Calendar
- OneCalendar premium$5.99
Questions
Is Calendar. Simple Calendars free?
Is One Calendar free?
Which has better reviews, Calendar. Simple Calendars or One Calendar?
Do Calendar. Simple Calendars or One Calendar have ads?
Which is updated more often, Calendar. Simple Calendars or One Calendar?
Other comparisons
