# Callisto Calendar — Calendar and Reminders > Intuitive calendar and reminder app with natural language event creation and astronomical data. (iPhone/iPad app by Duraid Abdul.) - Source: https://appshunter.io/ios/app/callisto-calendar/id1497394819 (this page in markdown: same URL + `.md`) - Developer: [Duraid Abdul](https://appshunter.io/developer/1417002529) - Category: Productivity - Price: Free with in-app purchases - Rating: 2.67/5 from 3 App Store ratings · 10 written reviews indexed - Age rating: 4+ - Requires: iOS 16.0 · 11 MB - Languages: English - Released: 2023-01-18 - Data updated: 2026-06-01 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/callisto-calendar/id1497394819/reviews.md ## What is Callisto Calendar? Callisto Calendar is an intuitive and powerful calendar app that helps you plan your month, keep track of reminders, quickly create events, and more! FEATURES • Natural Language Create events using natural language. For example, try "Meeting tomorrow at Starbucks." • Powerful Search Search your events to get results instantly, and apply search keywords like "birthdays" or "holidays." • Event Notes Quickly edit and preview an event's notes and URL without leaving the calendar view. • Calendar Views Quickly switch between a Week or Month view by swiping up. And with Callisto Pro, switch to the Summary View to preview your whole month. CALLISTO PRO Callisto Pro offers even more powerful features that help you get things done, fast. • Summary View Preview your whole month at a glance using the Summary View, which displays your list of events on each day. • Astronomy View the sunset, sunrise and moon phase for any selected day in the calendar. To plan the perfect photo, expand the sun view to reveal azimuth and elevation angles for any selected time. • Reminders Get smart suggestions for reminders when using natural language. For example, typing "Homework due next Friday at 6" to get a reminder suggestion. You can also view and complete reminders inline on the day they are due. ## Key features - Natural language event creation - Powerful event search - Event notes and URL editing - Week and Month calendar views - Smart reminder suggestions - Sunset, sunrise, and moon phase data ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Callisto Pro | Free | one-time | ## Recent user reviews (10 of 10) All indexed reviews: https://appshunter.io/ios/app/callisto-calendar/id1497394819/reviews.md ### 5/5 — Great but crushed *2025-11-29* Some bugs ### 1/5 — Calendar crashes instantly *2025-09-06, version 1.0.3* Just downloaded. Pressed settings, icon, and calendar crashed. Repeat it a couple more times and had same issue ### 1/5 — App Forefits *2024-10-24* When I try to enter settings or add a new event the app automatically quits itself. I can’t even try the app… I have no words… ### 1/5 — crashing *2024-09-18, version 1.0.3* crashing ### 4/5 — Some problems *2024-05-29* Some more improvements. I purchased the pro version of your application but when I change my Apple ID account, the pro version is removed from my mobile!!!!! What is the problem!!? Please solve it as soon as possible. The second problem I face in the application is that when I write new tasks, the application does not allow me to view the tasks within it as long as I have activated all the requests from the application, but when I go to the “Minical” application, everything appears in front of my face. I hope that you will allow the application to fully connect to the calendar applications. In order to use one application, such as the “Minical” app, it is the best app available on the iPhone without dispute. The second is your app, but it needs a lot of improvements. The third problem is that I found it within your app, which is when I type new tasks, the writing appears inside the official Apple application, “Calendar.” I hope you find it A quick solution to this problem should not hurt This is within the app. Just allow the full link to the Apple calendar application and the problem will be solved. I hope that all its problems will be solved as soon as possible. With my regards. ### 5/5 — In an epic quest for a calendar app we faced mythic beasts and lost friends yet arrived triumphant. *2024-01-19* Er… I kind of put so much into the title I didn’t leave much for the actual review. Suffice it to say: the stock Apple calendar is too simplistic and the UI makes me want to stare relentlessly into the midday sun, Fantastical was great for a while, with all the features I needed and such a great user experience, but not worth the price to me. So, long and hard did I search, and for a great many years, yet came up empty handed and bereft. All these calendar apps were MEDIOCRE, dear reader. Not a spark of creativity nor originality among them. I had begun to believe my quest for a replacement calendar app a fool’s errand. Until one sunny summer day (actually it was hooting down) I had recommended to me on App Raven (an august institution of esteemed repute) a certain, unassuming little app called Callisto. I liked it immediately (being named after the outermost of the Galilean moons of Jupiter), and I’m happy to report that further investigation did in no way disappoint. It’s a little beauty of a ripper of an app. ### 3/5 — Untitled *2023-05-09, version 1.0.3* Summaryの表示についてのレビューです。 終日予定と、時間指定予定の区別がつきづらくて分かりずらいです。 あと、2日や3日にわたっての終日予定でも、1日ずつになってしまうので、繋げて欲しいです。 ### 4/5 — Awesome! *2023-01-30* Great calendar app overall, purchased pro, just wish it had a few more options. 1) the ability to show the rest of the week’s events when a day is selected in week view. ie a section that says “later this week” underneath the current day’s events. 2) an “agenda” view that’s just a scrollable list of events in chronological order. 3) widgets 4) remember the previous view upon opening the app. When I open the full screen calendar view and close the app completely, returning should go back to full screen instead of bringing up the toolbar again. 5) ability to create template events with location, name, duration pre-defined ### 5/5 — Hidden Gem! *2023-01-23, version 1.0.1* This app is awesome! I’m super picky with my calendars, but this app has it all. The summary view is everything! Many of the calendars I’ve tried also require monthly subscriptions for the summary view but this app is just a one-time purchase and it comes with family sharing. My whole family switched to this calendar now and everyone loves it. Super intuitive and love the reminders option. Overall great app :) ### 5/5 — Love it! *2023-01-18, version 1.0.1* The UI is perfect! Text prediction while making reminders is on point and my personal favourite feature is getting a summary of your day on the calendar. Overall great app! I 100% would recommend it! 🙂 ## Frequently asked questions about Callisto Calendar ### What is Callisto Calendar? Callisto Calendar is a productivity app designed to help users manage their schedules, create events using natural language, and set reminders. It offers various calendar views and integrates astronomical data. ### How do I create an event in Callisto Calendar? You can create events by typing them in natural language, such as 'Meeting tomorrow at Starbucks.' The app interprets these phrases to set up your event details. ### Does Callisto Calendar offer different calendar views? Yes, Callisto Calendar allows you to quickly switch between Week and Month views by swiping up. The Pro version also includes a Summary View for a monthly overview. ### What are the benefits of Callisto Pro? Callisto Pro unlocks features like the Summary View for a monthly glance, detailed astronomical data (sunset, sunrise, moon phase, sun angles), and smart reminder suggestions. ### Does Callisto Calendar have ads? No, Callisto Calendar does not contain advertisements. It is a free app with optional in-app purchases for premium features. ### What devices is Callisto Calendar available on? Callisto Calendar is currently supported on iPhone devices. ### How often is Callisto Calendar updated? The app was last updated on February 10, 2023, with version 1.0.3. This indicates recent development activity, suggesting potential for future updates. ### What is the user sentiment for Callisto Calendar? Based on the provided data, Callisto Calendar has a rating of 2.7 stars from 3 ratings. This suggests that current user satisfaction may be mixed. ## Version history (last 3 releases) ### 1.0.3 — 2023-02-10 - You can now select which Reminder lists to display. - Fixed issue that prevented reminders from being added when suggested using natural language. ### 1.0.2 — 2023-02-04 - Added option to disable Sunrise/Sunset and Moon Phase. - Fixed an issue that could cause start date to be set incorrectly when creating a new event. ### 1.0.1 — 2023-01-18 No release notes. ## Apps similar to Callisto Calendar | App | Rating | Price | Category | | --- | --- | --- | --- | | [Sun & Moon - Sunrise Sunset](https://appshunter.io/ios/app/sun-and-moon-sunrise-sunset/id1485087619) | 4.7 (173) | Free | Productivity | | [SceneEscape\|StayFocused](https://appshunter.io/ios/app/sceneescapestayfocused/id6457943453) | 5.0 (3) | Free | Productivity | | [Habit Tracker 90 Day Challenge](https://appshunter.io/ios/app/habit-tracker-90-day-challenge/id6504715172) | 5.0 (5) | Free | Productivity | | [Haru : Daily calendar & Memo](https://appshunter.io/ios/app/haru-daily-calendar-and-memo/id6448709147) | 5.0 (3) | $0.99 | Productivity | | [Do - Simple Task Manager](https://appshunter.io/ios/app/do-simple-task-manager/id6479227548) | — | $2.99 | Productivity | | [Calculator History&calc](https://appshunter.io/ios/app/calculator-history-and-calc/id6461774831) | 4.6 (14) | Free | Productivity | --- *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 2026-06-01.*