Calendar 366 v4.0
Your events and tasks, now ready for iPhone Duo
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Calendar 366 brings events and tasks together in one native app for iPhone, iPhone Duo, iPad, Apple Watch and Mac. It works with iCloud, Google, Outlook & Microsoft 365, CalDAV and Todoist. What makes it different: 13 views, Calendar Sets, natural language input, Siri AI and MCP support for Claude and LM Studio. On the Mac it also lives in the menu bar. New in 4.0: iPhone Duo support, redesigned event and task details, new app icons and more reliable invitations.
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PH · launched Oct 19, 2026 · 1 upvote (top 67%)
- Horizontal
- Workflow automation
- Prosumer
- Not AI
- Commercial product
- iOS
- Productivity
- Calendar
Similar launches
See all 353 similar launches →Could you build this?
Partial Basic calendar apps are common, but syncing cleanly across iCloud, Google, Outlook, CalDAV, and Todoist natively with Apple Watch support and complex views is a massive synchronization challenge.
What it would actually take: A production version requires deep native Swift/SwiftUI development integrating EventKit alongside direct API sync engines for CalDAV, Microsoft Graph, Google Calendar, and Todoist. The hard part is managing complex offline-first conflict resolution, two-way delta syncs, Apple Watch background sync constraints, and multi-protocol parsing.
Competitors
Other products that read as similar to this one : 353 launches clear the similarity bar, closest 8 shown.
Attention rank: #197 of 354 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 325 days after the earliest competitor.
- Calnio · ph · 2026-10-04 · 67 upvotes · similarity 0.57
- TV - Family Calendar · ph · 2026-09-17 · 4 upvotes · similarity 0.54
- CalView Calendar · ph · 2026-10-21 · 1 upvotes · similarity 0.51
- PopTask for Apple · ph · 2026-07-08 · 156 upvotes · similarity 0.49
- Shift Path Work Calendar · ph · 2026-09-06 · 2 upvotes · similarity 0.48
- Tilly · ph · 2026-09-11 · 4 upvotes · similarity 0.47
- Side Calendar for Windows · ph · 2026-10-21 · 2 upvotes · similarity 0.47
- Hetk · ph · 2026-10-13 · 1 upvotes · similarity 0.47
Other launches for this product
- No other launches for this product.