Simple Calendar

Review by eFreeware

Simple Calendar is a free Android calendar from Simple Mobile Tool, a developer whose name promises exactly what this app tries to be: a scheduler that stays out of the way. The pitch is an offline monthly calendar with a customizable widget, and that is the main reason to consider it. Plenty of calendar apps try to be hubs for tasks, notes and email; this one is built around events and reminders.

The app has been around a long time, arriving in June 2016, and the install figures back up its staying power: over 10 million installs and a 4.4 average from more than 184,000 ratings. It is free to download and supported by ads and in-app purchases, so the cost of entry is low. If you want a calendar that works without a connection, this is the kind of app worth a closer look.

What the app actually does

At its core, Simple Calendar is a monthly calendar with an agenda view, and it works offline: no internet access is required, which supports privacy and stability. You can create events with times, durations, reminders and repetition rules, and switch between daily, weekly, monthly, yearly and list views depending on how much you want to see at once. That range of views matters more than it sounds, because a list of upcoming events answers a different question than a grid of the month.

The app also supports syncing through Google Calendar and other services that use the CalDAV protocol, including Microsoft Outlook, Nextcloud and Exchange. That suits people who keep their schedule in one place and want a simple way to view it. It can also import holidays, contact birthdays and anniversaries, which saves the tedious work of entering recurring dates by hand.

The look is material design, with a dark theme as the default. The developer calls it open source and says it has been translated into more than 45 languages. For a free app, that is a broad reach, and it suggests the project has been maintained rather than left to drift.

The widget and how you can shape it

The calendar widget is the headline feature, and customization is broad: event reminders, notification appearance, a small calendar widget, and the overall look. Reminder sounds, looping, audio stream and vibration can all be adjusted. If you have ever wanted a calendar to look a certain way on your home screen, this is the part of the app that speaks to you.

Themes and colorful calendars are mentioned as part of the personalization, so you can distinguish different calendars by color. That is a small thing, but it helps when you are juggling work, family and personal events in one place. The app offers a broad range of themes and widget sizes.

There is also a sharing angle: the app lets you share events quickly through social media, email and similar channels. That is useful for coordinating plans without retyping details, and it fits the family-organizer role the app aims for.

Moving your data in and out

Simple Calendar supports exporting and importing events as .ics files, which is the standard format most calendar programs understand. If you are moving from another calendar, or you want a backup you can keep, that is the feature that makes it possible. The app also lets you export settings to a .txt file so you can bring them to another device, which is a nice touch if you have spent time arranging things the way you like.

Between CalDAV syncing, .ics files and settings export, the app gives you several ways to avoid starting from scratch. None of this requires an internet connection for the calendar itself, though syncing with an online provider obviously depends on that provider. The developer's emphasis on offline use is about the calendar working on its own, not about syncing being unnecessary.

The practical result is that you can keep a local schedule and still move it around when you need to. That combination is less common than you might expect in free calendar apps, and it is one of the stronger arguments for this one.

What it asks of you

The app is free, but it contains ads and offers in-app purchases. The developer also makes a point of saying there are no complicated features, which is a claim about restraint rather than a promise of depth.

The offline design is the headline trade-off in the other direction: because the app is built to work without internet access, anything involving syncing or sharing depends on the services you connect. If you want your calendar to pull from Google Calendar or Exchange, you will need to set that up. If you want a purely local schedule, the app is happy to be that.

The customization is also a double-edged feature. A widget with many options takes some time to arrange, and the flexibility on offer means you will likely spend a few minutes deciding what you want before it looks right. That is not a flaw so much as the nature of a configurable tool.

Who it fits

This app is built for people who want a calendar and not much else. If your days are a mix of recurring appointments, birthdays, anniversaries and one-off meetings, and you want them visible on a home screen widget, the feature set lines up well. The repetition rules and reminder options cover the scheduling most people actually do.

It also suits anyone who cares about keeping their schedule local. The developer's offline framing and the open-source note will appeal to users who prefer not to hand their calendar to a service. The CalDAV support means you can still sync if you want to, but you are not required to.

Families and small teams are another fit, given the event sharing and the family-organizer focus. The ability to duplicate events and share them quickly is the sort of thing that helps when several people need the same information. The 45-plus language translations widen that reach further.

A dependable pick for a local schedule

Simple Calendar does one job and does it with a reasonable amount of control. The combination of offline operation, CalDAV syncing, .ics import and export, and a customizable widget covers the basics well, and the 4.4 rating across a large number of reviews suggests it has held up for a lot of people. The developer's updates in February 2026 indicate the app is still being worked on.

The app is ad-supported and includes in-app purchases. The app is also deliberately simple, so anyone hoping for more than scheduling will not find it here. That narrowness is the point.

If you want a free Android calendar that works offline, syncs when you ask it to, and lets you shape the widget to your taste, this is a sensible choice. If you need a full productivity suite in one app, it is not trying to be that. For the audience it targets, it looks like a dependable pick.