# One Calendar

> All calendars in ONE place!

Canonical page: [https://chrome-stats.com/d/id1238379385](https://chrome-stats.com/d/id1238379385)

## Overview

- **ID:** `id1238379385`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Code Spark
- **Category:** Productivity
- **Rating:** 4.80 / 5 (20,630 ratings)
- **Version:** 10.0.100
- **Last updated:** 2026-08-11
- **First published:** 2018-05-01
- **Size:** 90 MB
- **Data as of:** 2026-09-19
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/one-calendar/id1238379385)
- **Website:** [http://www.onecalendar.nl](http://www.onecalendar.nl/)
- **Privacy policy:** [http://www.onecalendar.nl/onecalendar/privacy-policy](http://www.onecalendar.nl/onecalendar/privacy-policy)

## Description

One Calendar aggregates all your calendars—Google, Outlook, iCloud, Exchange, Yahoo, and more—into a single, easy-to-read view. It makes it simple to see all your events at a glance.

This Chrome extension brings cross-platform syncing and management to one place, letting you view and edit appointments, events, and birthdays on all platforms.

## Rankings

- #11,363 — Overall
- #12 — button for google calendar
- #14 — google calendar
- #19 — calendar

## Review summary

One Calendar is praised for its clear, clean design and strong cross-device/calendar syncing. Reviewers highlight reliable syncing across Apple devices and with Google/Outlook, plus customization options (themes, colors, views) and high-quality widgets. It’s seen as easy to use, with no mandatory subscription and good family/business support. Common concerns focus on widget reliability and gaps on iOS (reloads after Pro, limited widget controls versus Android), customization limits behind paywalls (color/emoji options, backgrounds), and occasional bugs in the interface (invites tab disappearing, repeating events shifting). Overall, it's highly functional with targeted areas for improvement.

### Pros

- Clear, clean, and user-friendly interface that's easy to navigate.
- Excellent cross-device syncing across Apple devices and with Google/Outlook.
- Strong calendar integrations (Outlook, Gmail, Google Calendar, iCalendar) with reliable data across calendars.
- Rich customization options (themes, personal colors, views) and ability to tailor appearance.
- High-quality widgets and strong widget support, including detailed views.

### Cons

- Widget reliability on iOS is problematic (reloads after Pro purchase and limited widget controls compared with Android).
- Customization options are limited by paywalls (color coding, emojis, backgrounds); users want more colors, fonts, and to-do features.
- Bugs and stability issues (minor interface bugs, invites tab disappearing, and a repeating-event shift bug).

## Similar extensions and apps

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- [Caffeinated Calendar](https://chrome-stats.com/d/id6759939966)
- [Calendar All-In-One Planner](https://chrome-stats.com/d/id1437153734) — 4.30 / 5
- [OneCalendar: All in AI Planner](https://chrome-stats.com/d/id1127164793) — 4.00 / 5
- [Our Calendar - Shared calendar](https://chrome-stats.com/d/id6742693416)
- [CalendarSync](https://chrome-stats.com/d/id6760324878)
- [MajestiCal](https://chrome-stats.com/d/id6478199061) — 5.00 / 5
- [MirrorCal](https://chrome-stats.com/d/id6759610113)
- [CalUnity](https://chrome-stats.com/d/id6760173746)
- [NuCal Calendar Planner](https://chrome-stats.com/d/id6467134209)
- [Mana Calendar](https://chrome-stats.com/d/id6504821320) — 5.00 / 5

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Source: [Chrome-Stats](https://chrome-stats.com/d/id1238379385)