# ONE Calendar — All in one

> ONE Calendar — All in one (iPhone/iPad app by junichiro ono.)

- Source: https://appshunter.io/ios/app/one-calendar-all-in-one/id6793808541 (this page in markdown: same URL + `.md`)
- Developer: [junichiro ono](https://appshunter.io/developer/6793808543)
- Category: Productivity, Business
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 6 MB
- Languages: American English
- Released: 2026-09-13
- Data updated: 2026-10-12

## What is ONE Calendar?

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.

## Is ONE Calendar safe?

Not enough ratings yet to assess ONE Calendar.

## Is ONE Calendar legit?

ONE Calendar — All in one has limited verification signals. The AppsHunter Legitimacy Score for ONE Calendar is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-09-13

No release notes.

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## Related topics

[onecalendar free](https://appshunter.io/ios/topics/onecalendar-free) · [onecalendar](https://appshunter.io/ios/topics/onecalendar)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-12.*