# Alto Shared Time Calendar — For couples, family & friends > Shared busy/free calendar summary from all linked calendars. (iPhone/iPad app by System Operator LLC.) - Source: https://appshunter.io/ios/app/alto-shared-time-calendar/id6670268848 (this page in markdown: same URL + `.md`) - Developer: [System Operator LLC](https://appshunter.io/developer/1847669767) - Category: Lifestyle, Utilities - Price: Free - Rating: 5.00/5 from 2 App Store ratings - Age rating: 4+ - Requires: iOS 18.0 · 3 MB - Languages: American English - Released: 2024-08-29 - Data updated: 2026-09-19 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/alto-shared-time-calendar/id6670268848/reviews.md ## What is Alto Shared Time Calendar? Share when you are free, without showing what you are doing. alto.calendar builds one Busy/Free calendar out of the calendars you already keep. It carries only the blocks: when you are busy, and when you are not. No titles, no locations, no guests, no notes. Then you share that one calendar with your partner, your family or a friend, using Apple's own calendar sharing. They see when you are free. They never see what you were doing. They can make one too, so you can both see when everyone is actually free. - one Busy/Free calendar, built from any calendars you pick - event details never leave your device: only the blocks are shared - see today and tomorrow as a summary or a timeline, with everyone's blocks merged - declined invitations and anything marked free are ignored, so you are not shown as busy when you are not - all-day events are ignored by default, and you can turn that on - refreshes in the background as your calendars change - no account, no sign-up, no server. Your calendars stay in iCloud, where they already are Free. ## Key features - Create summary Busy/Free calendar - Share availability with others - View others' availability - Integrates all your calendars - Coordinate plans easily ## Frequently asked questions about Alto Shared Time Calendar ### What is alto.calendar? alto.calendar creates a summary calendar showing your busy and free times, compiled from all your existing calendars. This allows you to easily share your availability with others or see theirs. ### How does alto.calendar help me coordinate plans? By sharing a consolidated busy/free calendar, you and your contacts can quickly see when everyone is available, simplifying the process of finding a time to meet or connect. ### What devices does alto.calendar support? Currently, alto.calendar is available for iPhone devices. ### Is alto.calendar free to use? Yes, alto.calendar is completely free to download and use, with no in-app purchases or advertisements. ### How often is alto.calendar updated? The app was last updated on December 2, 2024, with version 1.13. This indicates active development and regular improvements. ### What is the age rating for alto.calendar? alto.calendar has an age rating of 4+, making it suitable for a wide range of users. ### What do users like about alto.calendar? Based on its rating of 5.0 stars from 2 reviews, users likely appreciate its straightforward functionality for sharing availability and its ease of use. ### Does alto.calendar have ads? No, alto.calendar is ad-free, providing an uninterrupted user experience. ## Version history (last 5 releases) ### 2.4 — 2026-09-15 A new icon, and a widget that says until when. - a new app icon for the iOS 26 home screen, drawn like the built-in apps - the Everyone widget now says until when each person is free, and on which day - the Someone and Together widgets say the day too, so "free until 4:00 AM" is never a surprise - one button switches Today between list and timeline ### 2.3 — 2026-09-13 A small update. - your "show their time" setting now carries over to each person after the update, instead of being lost - new screenshots on the store page, showing the app as it is today ### 2.2 — 2026-09-11 Three widgets, and the app can now tell you when you are both free. - three widgets instead of one: Someone, Everyone, and Together, which answers when you and one person are both free - a notification for that moment, set per person, entirely on your phone - each person now has their own settings: a nickname, their local time, and whether to tell you - link a person to a contact for their photo, and message them the invite in one tap - see when someone's calendar last updated, so a stale week no longer looks like a free one - your own calendar is rebuilt overnight and from the widget, so it stays current - a new icon ### 2.1 — 2026-09-10 A widget, a clearer Today, and a new icon. - a home screen and lock screen widget: who is free, right now, without opening the app - Today now says who is free AND who is busy, and counts you in: "You and Sarah are free right now" - the timeline draws each person in their own colour, with a line for the current time - when everybody has time, the app says so in your own words - the invite flow tells you who has not shared their calendar back yet - a new icon ### 2.0 — 2026-09-09 A new icon, and a much more careful calendar. - declined invitations and events marked free no longer show you as busy - all-day events are ignored by default, and there is now a setting for it - fixed a bug where building your Busy/Free calendar could alter the events it was reading - new Settings tab - in-app feedback, so you can tell us when something is wrong ## More apps by System Operator LLC - [Alto Daily Habit Tracker](https://appshunter.io/ios/app/alto-daily-habit-tracker/id6478018751) - [Original.me](https://appshunter.io/ios/app/originalme/id6756148804) - [tinydot: websites, wiki & CMS](https://appshunter.io/ios/app/tinydot-websites-wiki-and-cms/id6756752551) - [bloodywork](https://appshunter.io/ios/app/bloodywork/id6757708871) - [Wander: Markdown Editor](https://appshunter.io/ios/app/wander-markdown-editor/id6791206855) All apps by System Operator LLC: https://appshunter.io/developer/1847669767 --- *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 2026-09-19.*