# One Calendar — All calendars in ONE place!

> Unified calendar app for managing multiple online calendar accounts. (iPhone/iPad app by Code Spark.)

- Source: https://appshunter.io/ios/app/one-calendar/id1238379385 (this page in markdown: same URL + `.md`)
- Developer: [Code Spark](https://appshunter.io/developer/1238379384)
- Category: Productivity
- Price: Free with in-app purchases
- Rating: 4.80/5 from 20,539 App Store ratings · 825 written reviews indexed
- Age rating: 12+
- Requires: iOS 15.0 · 90 MB
- Languages: American English, Catalan, Czech, Danish, Dutch, French (France), German (Germany), Hindi, Italian, Japanese and 6 more
- Released: 2018-05-01
- Data updated: 2026-08-28
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/one-calendar/id1238379385/reviews.md

## What is One Calendar?

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.

## Key features

- Integrates multiple calendar providers
- Easy-to-read overview
- Manage appointments and events
- View birthdays
- Cross-platform availability

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| OneCalendar premium | $5.99 | one-time |


## What do users think of One Calendar?

Overall sentiment: positive

**Pros**

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

**Cons**

- 🐛 Syncing issues
- 🐛 Bugs and glitches
- 🔒 Lacks security features
- 🔋 Drains battery
- 👎 Restrictive features in free version

**Commonly reported bugs**

- Sync errors
- Unresponsive buttons
- Incorrect time zone display
- Duplicate events
- Inability to delete future occurrences of recurring events

**Most requested features**

- Multiple reminders for events
- Ability to edit recurring events
- Option to change event calendar after creation
- Printing support
- More customization options
- Widgets for better visibility

## Recent user reviews (10 of 825)

All indexed reviews: https://appshunter.io/ios/app/one-calendar/id1238379385/reviews.md

### 1/5 — Does not sync

*2026-08-18, version 10.0.100*

It will not sync with all of my calendars, though it says it does. This has caused me to miss important appointments. Do not waste your time on this calendar.

### 3/5 — Have to pay for Premium for each device

*2026-08-11, version 6.910.3*

This is the first app I’ve used that wants you to pay for each device you want to use the Premium version either Android or Apple. It would be nice to pay once and use on both iPhone and iPad. I haven’t tried adding new events, but it at least got my multiple calendars displayed correctly from the start. I hope there will be an option to change the widget theme soon.

### 5/5 — Simple. Helpful.

*2026-07-21, version 6.910.3*

I just needed everything in one place - one calendar does that and more. Worth a look!

### 5/5 — MUCH MORE VISUALLY PLEASING

*2026-07-19, version 6.910.3*

Much prefer this to Apples App. You can see more and it’s more customisable.

### 3/5 — NOT Fair, free for Mac $5.99 for iOS..

*2026-06-28, version 6.901.0*

This seems like a nice capable calendar app but there is no capability to easily transfer your account access from one platform to another, you have to manually enter access codes, not a show stopper but annoying.. 
When I started working this on MAC, I liked it. Little did I know that when I wanted to use it on my iPhone it’s free to download but there are some very necessary features that you have to pay for like changing calendar colors (if you have more than one persons calendar displayed).

### 4/5 — Hate that they always ask for a review

*2026-06-24, version 6.901.0*

Above reasons

### 5/5 — Love It So Far

*2026-06-07, version 6.901.0*

I like this calendar a lot. Very easy to schedule appointments.

### 4/5 — Just missing widgets

*2026-05-28, version 6.901.0*

Great app but I can’t find any widgets for my MacBook.

### 4/5 — Some widget stopped working

*2026-05-28, version 6.901.0*

I have a paid subscription since I really like this calendar. For some reason, the widgets don’t always work. I have tried to delete it restart my phone reloaded it and synced it but it’s still happening. Other than that, it’s a great app.

### 5/5 — Can't restore license

*2026-05-25, version 6.901.0*

I love this app I previously brought it but it won't let me restore its saying I have never purchased which I have... It's a good app but I need help please

## Frequently asked questions about One Calendar

### 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.

## Version history (last 5 releases)

### 10.0.100 — 2026-08-11

Upgrade to NET10

### 6.910.3 — 2026-07-10

Upgrade to iOS 26 (XCode)

### 6.901.0 — 2025-12-12

Minor fixes

### 6.900.3 — 2025-11-04

Minor fixes

### 6.900.2 — 2025-10-29

Minor fixes

## Apps similar to One Calendar

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Calendars: Schedule Planner](https://appshunter.io/ios/app/calendars-schedule-planner/id608834326) | 4.7 (121,097) | Free | Productivity |
| [Google Calendar: Get Organized](https://appshunter.io/ios/app/google-calendar-get-organized/id909319292) | 4.5 (131,463) | Free | Productivity |
| [minical - Planner & Calendar](https://appshunter.io/ios/app/minical-planner-and-calendar/id1558953048) | 4.8 (5,706) | Free | Productivity |
| [TickTick:To-Do List & Calendar](https://appshunter.io/ios/app/ticktickto-do-list-and-calendar/id626144601) | 4.9 (45,223) | Free | Productivity |
| [Tiny Calendar: Planner & Tasks](https://appshunter.io/ios/app/tiny-calendar-planner-and-tasks/id514917848) | 4.6 (20,601) | Free | Productivity |
| [Simple Calendar - SimpleCal](https://appshunter.io/ios/app/simple-calendar-simplecal/id1227579630) | 4.7 (16,132) | Free | Productivity |

## More apps by Code Spark

- [One Tasks](https://appshunter.io/ios/app/one-tasks/id1455000420)

All apps by Code Spark: https://appshunter.io/developer/1238379384

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*