- Unified view: Combine calendars from multiple providers.
- Cross-platform apps: Available for Android, iOS, macOS and Windows.
- Provider support: Google, Outlook, iCloud, Exchange and CalDAV are listed by the vendor.
- Offline access: The product materials describe offline calendar use.
- Premium features: Premium capabilities are distributed through the relevant app stores.
OneCalendar.nl
Cross-platform calendar app for unified scheduling and offline access
Updated August 11, 2026
OneCalendar.nl Overview
OneCalendar combines Google, Outlook, iCloud, Exchange and CalDAV calendars in one app. It is available on Android, iOS, macOS and Windows, which makes it useful for people who switch between devices or calendar providers.
Users can view and update events from a single interface instead of checking each account separately. Offline access keeps calendar information available when an internet connection is unreliable.
Key Features
Pricing
| Plan | Price | Featured |
|---|---|---|
| Free version | $0 | Cross-platform calendar sync, basic views and widgets |
| Premium | Price varies by app store | Premium features are offered through the relevant store; the current vendor page does not publish one universal numeric price |
OneCalendar offers a free version and sells Premium through app stores. Check the relevant store for the current local upgrade price.
Pricing source: OneCalendar Premium features
Pros
| Compared with | Why this product may fit better |
|---|---|
| Google Calendar | Choosing Google Calendar means taking a different route. OneCalendar can show Google, Outlook, iCloud, Exchange and CalDAV accounts in one interface. That makes it useful for someone whose schedule spans providers and who does not want Google’s own calendar to be the center of every account. |
| Outlook Calendar | Unlike Outlook Calendar, the same OneCalendar app is available across Windows, macOS, Android and iOS while accepting calendars outside Microsoft’s ecosystem. Mixed personal and work accounts can therefore share one view without moving all events into Outlook. |
| Business Calendar 2 | When choosing between Business Calendar 2 and this product, OneCalendar’s provider coverage and desktop apps make it a wider cross-platform aggregator than an Android-focused power calendar. It fits users who value seeing every account consistently more than extensively tuning one phone’s widgets and views. |
| Fantastical | Where Fantastical is the other option, a free starting point lets people test account compatibility before paying for Premium features. That is appealing when the main job is straightforward multi-provider viewing and synchronization rather than a premium scheduling and productivity layer. |
Cons
| Compared with | Where this product may fall short |
|---|---|
| Google Calendar | Google Calendar supplies a mature web app, sharing controls and integrations at no separate calendar charge. OneCalendar adds another synchronization layer and is less compelling when nearly every participant and device already uses Google. |
| Outlook Calendar | Here, Outlook Calendar has the clearer case. Outlook connects calendar work directly to Microsoft email, meetings and organizational accounts. OneCalendar is a weaker option for companies that depend on those large-company processes and need support from an approved Microsoft-centered stack. |
| Business Calendar 2 | Android power users may find deeper phone-specific views and widgets in Business Calendar 2. OneCalendar’s cross-platform consistency can come at the expense of the detailed on-device customization that matters to someone planning almost entirely from Android. |
| Fantastical | Fantastical offers a more ambitious premium experience around natural-language entry and scheduling. OneCalendar should be chosen for practical aggregation, not because its store-based Premium upgrade has been proven to match every higher-end planning feature. |
Reviews
- OneCalendar on Google Play: The listing confirms the Android app, supported distribution and current user-feedback route. Store comments are especially useful for checking account synchronization after OS or provider changes.
- OneCalendar on Trustpilot: The profile showed 3.3/5 from only three reviews. That sample is too small for a broad conclusion, though its complaints about account connections and privacy can still inform a focused trial checklist.
