Saturn Calendar

Review by eFreeware

Most calendar apps are built for one person keeping their own life in order. Saturn Calendar takes a different starting point: it is designed around friends, family and the plans you make together, with the personal side of scheduling handled alongside. If your week involves coordinating with other people as much as it involves tracking your own commitments, that framing is likely to feel more natural than a standard productivity calendar.

The app is free, carries no ads and offers no in-app purchases, which matters for a tool you might open several times a day. It has been installed more than 500,000 times and holds a 4.3 average across 4,482 ratings, figures that suggest a settled audience rather than a novelty. It first appeared in April 2024 and was still being updated in October 2026.

What you get is a day view that gathers classes, events, to-dos and what is coming up in one place, plus the tools to compare schedules with the people you actually make plans with. There is also a clear student angle: bell schedules, class periods and assignment tracking are treated as first-class features rather than an afterthought.

A calendar built around other people

The feature that defines Saturn is schedule comparison. You can see what your friends have going on and work out where your free time overlaps, and the developer notes that this happens without exchanging email addresses. That last part is the detail I find most interesting, because the usual friction in coordinating a group is not the planning itself but the setup: adding contacts, sharing links, granting access to a calendar you would rather keep private.

Shared calendars extend the same idea to groups with a longer horizon. You can set one up for a team, a club, a household or a trip, then add events and invite the people involved so everyone is working from the same information. For a household splitting responsibilities or a club running a season of fixtures, that is a lighter arrangement than a group chat where decisions disappear up the scroll.

The audience this fits is fairly specific. It is for people whose calendar is genuinely shared property: students coordinating with classmates, friends who plan trips together, families keeping track of who is where. If your scheduling is mostly solitary and private, the social layer is simply extra surface area you would not use.

Your own day, classes and to-dos

On the personal side, Saturn shows your day at a glance, combining classes, events, to-dos and upcoming items in a single view. To-dos carry due dates, which makes the app usable for homework and everyday tasks rather than only for appointments. That combination is what separates a calendar you check from one you actually run your week out of.

Google Calendar can be connected so your existing calendars come together in one place, which avoids the awkward choice between running two apps or abandoning the one you have.

The student tooling is more developed than I expected from a general scheduling app. You can load your school's timetable, which covers setups such as A/B days, lunch waves, block schedules and rotating periods, then add your classes and see what is happening now and what comes next. For anyone whose day is chopped into periods that change from one day to the next, that is the part that saves the most mental arithmetic.

College is another audience the developer has in mind, with classes, assignments and plans in one place. The same structure that handles a high school timetable scales reasonably to a semester with irregular lecture times and deadlines scattered across courses.

Snapchat, Bitmoji and birthdays

Saturn connects to Snapchat, which does two things: it helps you find friends who already use Saturn, and it brings your Bitmoji into your profile. Friends' birthdays also appear alongside your plans, so you are not relying on a separate reminder to notice them.

This is the piece of the app that will divide people. If Snapchat is already where your social life happens, the connection removes a step and gives the calendar a familiar face. If it is not part of how you communicate, the feature is easy to ignore, but it does explain who the app was designed around.

I would not treat the social features as decoration. They are the reason the app exists in this form, and they shape how the rest of it is organized, from how events are shared to how free time is found.

What it costs, and what it asks of you

Saturn Calendar is free to download and use, with no ads and no in-app purchases. That is unusual for a scheduling app with a social layer, and it removes the usual questions about whether a useful feature sits behind a paywall or whether the free version is deliberately limited.

The trade-off is not financial but practical: the parts of Saturn that make it distinctive depend on other people joining in. Comparing schedules only works if your friends use it too, and shared calendars only work if the people you invite accept. Used alone, it is a competent calendar with class timetables and to-dos; used with a group, it becomes something harder to replicate.

The app is rated for Everyone, and the developer has kept it current, with recent work covering bell schedule submissions, clearer error prompts when an event is missing a title or has an invalid end time, an "Ended" label on past events, and a handful of bug fixes around classes, reminders and bug reports.

How it compares with the alternatives

The obvious comparison is a general-purpose calendar tied to an operating system or a productivity suite. Those tend to be stronger on personal organization and weaker on coordination: sharing a calendar usually means granting access to the whole thing, and comparing availability across several people is rarely the point.

A shared calendar service built for teams is the other direction. Those handle group scheduling well but are usually aimed at workplaces, with the structure and tone that implies. Saturn sits between the two, closer in spirit to a group chat than to a project management tool, and it is the student features that give it a distinct reason to exist.

A dedicated timetable app is worth considering if your only need is following a rotating bell schedule. Those tend to go deeper on period patterns and less far on the social side. Saturn's advantage is that the timetable, the to-dos and the shared planning live in one place rather than three.

A calendar worth adopting with your group

Saturn Calendar is a well-judged app for a specific situation: you are a student, or part of a close group of friends or family, and coordinating with other people is a routine part of your week. The free, ad-free model means there is little cost to trying it, and the class schedule support is detailed enough to be useful on its own.

The condition is participation. Its best features are only as good as the people you bring with you, and someone scheduling alone will find a capable calendar rather than a transformative one. If your group is willing to move across together, the combination of shared planning, birthdays and class timetables is hard to match in a single app.

For students and tightly knit groups, it is worth installing and testing with the people you actually plan with.

What's new in version 3.47.00.1830

What's new • Class times missing for your school? Send us a photo of your bell schedule right from Add Class or a class period. • Creating an event now points out a missing title or invalid end time without losing your details. • Past events show "Ended" instead of RSVP options. • Opened event stacks keep equally wide cards and a steady highlight. Fixed: classes missing from your profile, reminders from a deleted shared calendar, and bug reports attaching the wrong screenshot.