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  • ONE Calendar — All in one screenshot 1
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About ONE Calendar — All in one

One calendar. Every commitment. ONE is a smart scheduling app built for people who manage multiple calendars across work, business, and personal life. Whether you're an entrepreneur, freelancer, consultant, or part of multiple teams, ONE gives you a single view of your availability by syncing your calendars from Google Calendar and Microsoft Outlook. Stop switching between calendars. Stop double-booking. Spend less time coordinating schedules and more time getting work done. Key Features • Sync multiple calendars Connect Google Calendar and Microsoft Outlook to manage all your schedules in one place. • See your true availability ONE automatically combines your calendars so you always know when you're actually free. • Schedule with confidence Share your availability and coordinate meetings without manually checking multiple calendars. • Built for multi-project professionals Perfect for entrepreneurs, freelancers, consultants, investors, creators, and anyone balancing multiple commitments. Why ONE? Modern work isn't tied to a single company or a single calendar anymore. ONE helps you stay organized across every project, team, and organization—so your time stays aligned wherever you work. Download ONE and make scheduling simple.

App privacy

The developer, junichiro ono, reported these privacy practices to Apple.

Data Linked to You

The following data, which may be collected and linked to your identity, may be used for the following purposes:

  • Contact Info: Email Address, Name, Other User Contact Info
  • User Content: Customer Support
  • Identifiers: User ID, Device ID

Used for: App Functionality

Alternatives to ONE Calendar — All in one

Looking for apps like ONE Calendar — All in one? Here are 6 similar apps on the App Store. The highest rated is One Tasks (4.8/5), and all 6 are free to download.

ONE Calendar — All in one vs. alternatives
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ONE Calendar — All in one – Free September 13, 2026
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Pine Assistant 4.4 / 5 (148) Free Oct 30, 2026 Compare
One Tasks 4.8 / 5 (276) Free Nov 2, 2026 Compare

Compare ONE Calendar — All in one with the top alternatives: ratings, updates, ASO score and keyword gaps →