HenkSuiteTL;DRThe best calendar app with tasks built in is the one where you can drag a task onto a time slot without copy-pasting. HenkSuite is the only fully native, offline-first option with Calendar and Tasks in one app. Fantastical and Notion Calendar layer tasks on top of cloud calendars. Sunsama and the Todoist plus Google Calendar combo work but require two services.
Quick answer: the unified pick
For years, calendars and to-do lists lived in different apps, synced poorly, and forced people to manually move tasks onto time slots. In 2026 that's finally changing. A handful of apps now do real drag-and-drop between tasks and calendar - some as a layer on top of Google Calendar, some as a single native app.
Here's a no-fluff comparison of the five options worth your time, and the criteria that actually matter once you start using them daily.
Why a unified calendar plus tasks setup matters
The two-app tax
Running tasks in one app and the calendar in another sounds fine until you live with it for a month. You triple-check whether Tuesday's deadline is on the calendar. You forget to time-box important tasks. You copy task titles by hand. The friction compounds, quietly, until you stop trusting either system.
Drag, don't paste
The single feature that defines the category is drag a task onto the calendar to schedule it. If your current setup requires you to copy a title and create a calendar event by hand, you don't have a calendar-tasks app. You have two apps in the same browser tab.
What separates a real calendar-tasks app
One-way vs two-way sync
One-way sync shows tasks as calendar events but doesn't update the task when you drag the event around. Two-way sync updates both. Two-way is the version you actually want - one-way is mostly a visual overlay.
Offline support
Most cloud calendar apps fall over without an internet connection. Native local-first apps don't. If you travel, fly, or work from cafes, this matters more than any feature comparison chart.
Native drag-and-drop
Native drag-and-drop with proper hit targets, smooth resizing, and full undo separates serious tools from demos. Web-based drag-drop is often janky and breaks on touch devices.
The 5 best calendar apps that sync with tasks
HenkSuite - native unified calendar and tasks
HenkSuite ships Calendar and Tasks as two modules of the same native app, backed by a single local SQLite database. Tasks can be dragged onto any calendar slot, resized, and converted back to undated tasks. Because everything is one app with one data store, sync isn't a feature - it's an architectural property.
- ✓Native drag-and-drop in both directions
- ✓Fully offline-first - works on flights and during outages
- ✓One local SQLite file holds tasks, events, and time tracking
- ✓One-time license instead of monthly subscription
- ✕No real-time multiplayer for shared calendars
- ✕Two-way Google Calendar sync is read-first
- ✕Designed for individuals and small teams, not enterprises
Fantastical - the polished Apple-native option
Fantastical is the gold standard for calendar UI on macOS and iOS. It pulls tasks from Apple Reminders, Todoist, and Google Tasks, and lets you drag them onto the calendar. The natural language event entry (“lunch with Sam Tuesday 1pm”) is still industry-leading.
- ✓Beautiful native macOS and iOS app
- ✓Best natural-language event creation
- ✓Excellent Apple Reminders integration
- ✕Apple-only - no Windows, no Linux
- ✕Subscription required for full feature set
- ✕Tasks are a layer, not a first-class module
Google Calendar plus Todoist - the integration combo
Todoist's calendar integration shows tasks as calendar events and lets you drag them around. It's the default free-ish option for Google Calendar users who want a tasks layer without leaving their browser.
- ✓Free tier is genuinely useful
- ✓Works on every platform with a browser
- ✓Massive plugin and integration ecosystem
- ✕Two apps, two inboxes, two mental models
- ✕Cloud-only - no offline experience worth using
- ✕Drag interactions sometimes fight each other
Notion Calendar - lightweight calendar layer
Notion Calendar (formerly Cron) is a slick calendar app that ties into Notion databases. It surfaces Notion tasks alongside calendar events and lets you do basic time-blocking. It's more polished than ambitious.
- ✓Beautiful interface, fast keyboard shortcuts
- ✓Tight integration with Notion databases
- ✓Free for personal use
- ✕Useful only if you already live in Notion
- ✕Limited task management features
- ✕Cloud-only and Notion-dependent
Sunsama - daily planning ritual
Sunsama pulls tasks from a dozen sources (Asana, Trello, Jira, Gmail) and walks you through a daily planning ritual where you place each task on the calendar. It's less of a calendar app and more of a daily commitment ceremony.
- ✓Best-in-class daily planning workflow
- ✓Deep integrations with task managers
- ✓Promotes intentional, calm planning
- ✕$20/month - the most expensive in the list
- ✕Web-app feel - not fully native
- ✕Probably overkill if you already plan well
Best fit ifYou want one native app where Calendar, Tasks, Notes, and Time Tracking share the same database and work offline - take HenkSuite for a test drive.
How they compare on the things that matter
- Native drag-and-drop: HenkSuite, Fantastical, Sunsama (web).
- Two-way sync: HenkSuite (internal), Fantastical via Reminders, Sunsama via integrations.
- Offline-first: Only HenkSuite is offline by default.
- Cross-platform (macOS, Windows, Linux): HenkSuite, Sunsama (web), Notion Calendar (mostly).
- One-time license: Only HenkSuite. The rest are subscriptions.
FAQ: calendar plus tasks apps
What does "two-way sync" really mean?
It means a change in either app updates the other. Drag a task on the calendar, and the task's due date changes too. Many apps advertise sync but only push tasks one direction. Always test by editing on both sides before you commit to a setup.
Which apps work on an airplane?
HenkSuite is the only one in this list that's designed to be fully usable offline. The others depend on cloud syncing for most operations. Fantastical caches recent data and is the second-best option here.
What about team calendars?
For small teams, HenkSuite supports shared projects and a unified team view. For large enterprises with hundreds of users and real-time co-editing, Google Workspace or Microsoft 365 are still the right answer. The category is converging - small teams get more options every year.
The bottom line
The best calendar app for tasks is the one that lets you drag, replan, and trust the system. The two-app combo works but adds a tax. Layered cloud apps work but disappear when your connection does.
If you want a native, offline, one-time-license option where Calendar and Tasks are the same app, give HenkSuite a try. Install, drag a task onto Tuesday at 2pm, and notice that the whole pattern just works.
About the author
Emilia is the founder of HenkSuite. She builds productivity tools because the internet has 47 of them and none of them feel fast, private, or finished.