Calendar
284 open source Calendar apps
Reservator
APK
Displays the availability status of meeting rooms along with the free/busy-time. Requires a Google-Account for schedules. Reservator is an open source meeting room display system for tablets. Mount your tablet next to your meeting rooms door, install Reservator and you're good to go! Reservator uses your Google calendar's resources for booking so you can use it, for example, for conference rooms, classrooms or for lending a video projector. While using Reservator, you can still book rooms normally through Google Calendar. You can also use the application for reserving other meeting rooms within your company. Features: * Integration: Reservator works with Google apps. * Booking: You can instantly book a meeting room with Reservator. You can also view the rooms calendar and book a meeting somewhere in the future. Simply pick the time and enter your name and it's booked. * Traffic lights: The display will be green if the room is available, yellow if a meeting is about to start soon and red if it's reserved. With this information you can quickly decide what conference room you want to use by just walking around.
F-DroidGitHub
RomanDigital
APK
The RomanDigital app provides a clock of unique style that can be used to repurpose an old device or to display time on a current model. For more personal use, the RomanDigital widget makes a distinctive addition to a device's Home screen. RomanDigital includes features expected in an ordinary digital clock, such as: * Choice of 12 or 24 hour format * Optional AM/PM indicator (uniquely integrated into the time display) * Option to keep display on when app is in the foreground * Display in either portrait or landscape RomanDigital also includes: * Independent configuration of app and widgets. * Selectable app and widget time display typeface (monospace, sans-serif, or serif). * Variable widget background opacity that can be set from 0% to 100% by tens. * Selectable widget time zone. * Selectable widget layouts to add a time zone label. * Selectable app time display color. For more detailed information including a FAQ list, please see the README.md file accompanying the RomanDigital source code. Source code for RomanDigital is available at: https://github.com/dfyockey/RomanDigital
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Roto
APK
Roto is an offline, privacy-first way to keep any rotating schedule on-device. Load a JSON rota, pin the widget, and check today or tomorrow at a glance—no accounts or trackers. - Works fully offline; optional refreshable download from a user-provided HTTPS link - Handles repeating week cycles (Week 1/Week 2/Week 3...) anchored to real calendar Mondays - Supports per-date overrides without editing the base cycle - Flexible slots with labels, tags, and notes for menus, shifts, or duties - Homescreen widget for today/tomorrow - Ships with sample rotas and an AI-friendly prompt to generate your own JSON quickly All data stays local; dependencies are open source and F-Droid friendly.
F-DroidGitHub
Routine Tracker
APK
Routine Tracker is a planner that aims to simplify managing activities that you need to perform consistently. It combines features of a planner calendar app and a habit tracker allowing you to keep all your activities in one place.Features:Flexible schedules: The app supports daily, weekly, monthly, and alternate-day schedules. You're free to choose specific days or inform the app how many times you wish to complete the task within a period.Adaptive schedule that changes automatically based on your progress: When you fail to complete your routine, you’ll be suggested to sort out the backlog on the next non-due day. And vice versa, when you over-complete your routine, the next scheduled occurrence will be canceled. This behavior can be altered in the settings.Adequate streaks: Streaks do not only form out of multiple completions in a row. Non-due days are included in the streak as well. Your streak will remain unbroken as long as you complete the habit the planned number of times within a given period.Plan ahead: The routine calendar displays completions, streaks, and planning dates to help you visualize your progress and plan your future time effectively. View a clean and organized agenda for any date, eliminating visual clutter.Modern UI: Enjoy a visually appealing and modern interface, following the principles of the Material You design. The application supports both light and dark modes, landscape orientation, and dynamic color on Android versions 12 and later.Completely free app with no limitations: Track as many habits as you wish. Routine Tracker is entirely free and contains no ads or in-app purchases.Works offline and respects your privacy: Routine Tracker operates independently without needing an internet connection or online account registration. Your confidential data always remains on your device. Neither the developers nor any third parties can access your information.More to come, so stay tuned…
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RxDroid
APK
A simple medication reminder. Also keeps track of your pill count and required refills. Help with translating RxDroid to your language at crowdin.com!
F-DroidGitHub
Salat Times
APK
The app can use GPS to find your location, although you can enter geographic coordinates. It calculates prayer times, gives notifications and has a Qibla for showing the direction of Mecca.
F-Droid
Screen Time
APK
Displays your screen time in a permanent notification. By making screen time more prominent, you can get a better sense of how much of the day you spend on your phone. Without judgement. Just so you know. This is open source: https://github.com/markusfisch/ScreenTime
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Scrum Chatter
APK
Time members while they speak at meetings. See who chatters the most in meetings. View average and total speaking time of members for all recorded meetings. Share the stats for one meeting or for all meetings. Export to Excel so you can add your own lovely charts and graphs as you see fit. You can export and import the database. Note: this app does NOT use the microphone to automatically detect when a person is speaking. You must press on a "play" button when a team member speaks.
F-DroidGitHub
Self Attendance Tracker
APK
Using Self Attendance Tracker, students can track their class attendance on their own. They can 1. See the classes they have to attend today 2. List of course for which attendance is being tracked and see presents, absents and cancelled classes per course 3. Create schedule for the week so that these schedule classes are repeated weekly 4. Create extra classes that are additional to the weekly schedule classes 5. See marked attendance record for a specific course
F-DroidGitHub
Shake Alarm Clock
APK
Tired of pressing the power button/swiping the screen every time an alarm rings? No worries! With this app, you can simply shake your phone and dismiss the alarm.Salient features:Works offline.No advertisements.Completely open-source app.Alarms are unique by alarm time. This means that you cannot have two alarms at the same time, even if they are on different dates.Each alarm is independent of other alarms. This means that the alarm volume, ringtone, etc. will not be carried over to another alarm unless you do so manually.Inbuilt dark theme, even in phones that do not support it.Snooze your alarm as many times as you want with custom snooze options.When updates are released, you will be notified within the app itself.The alarm is handled by a service which has almost no dependency on the UI. So, even if your UI freezes, the alarm will ring and can be dismissed.Uses latest Android Room database for storing alarms.Actively maintained app. Bug reports will be worked upon with high priority.
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ShiftCal
APK
ShiftCal A FOSS Shift Calendar. Features: - Create your Shifts - Set an Alarm for the Shifts - Enable DoNotDisturb while Working - Select individual colors - View them in the calendar - Simple material design
F-Droid
ShiftSwift
APK
ShiftSwift is the ultimate app for managing your work shifts, designed to make your life easier and more organized. Whether you're working irregular hours or just need to stay on top of your schedule. Key Features: * Shift Blocks: Save time by adding multiple shifts at once. Predefine a group of shifts and schedule them in one go. * Shift Alarm: Never miss a shift again! ShiftSwift comes with a built-in alarm that wakes you up when your shift is about to begin, ensuring you're always on time. * Automatic Do Not Disturb Mode: No more interruptions during your shifts! ShiftSwift automatically activates and deactivates your phone’s "Do Not Disturb" mode based on your shift schedule. * Calendar Synchronization: Easily sync your work shifts with your regular calendar to keep all your events and appointments in one place. * Statistics Tracking: Stay informed with statistics on your shifts, hours worked, and more. * Modern Design: ShiftSwift features a clean and modern design, offering an intuitive and visually appealing experience. The easy-to-navigate interface ensures you can manage your shifts with minimal effort. * Family Sync: Keep your loved ones in the loop by sharing your shift schedule with family or friends. They’ll always know when you're working and when you're free. * PDF Export – Easily generate and export your shift schedule as a PDF file. Developed by a Nurse. Yes i do use it.
F-Droid
Shorey
APK
Shorey is a simple note app which is built with Flutter 2 and supports both Android/iOS platforms. It provides me full experience of interacting with Flutter and in the meantime I hope it can be your knowledge/memory transition tool, and yes, there still much work to do. Features: * Google Material UI * Lightweight, only 10mb * Retrospect everyday to organize information faster * Concise note-taking * Set the mantra to inspire yourself * Set the main goal to stay focus * Keep track of the Heat map * Supports simple Chinese and English
F-DroidGitHub
Simple Deadlines
APK
A simple and easily readable deadline manager. A daily notification allows you to organise your day. It is aimed towards simplicity and is very lightweight.
F-DroidGitHub
Simple Time Tracker
APK
Simple Time Tracker helps you track how much time you spend during the day on different activities. Start new activities with one click. View previous records and statistics over time. The app is free and open source. Also widgets, backups, notifications and dark mode. Also supports watches with Wear OS and has complication. • Simple interface App has a minimalistic interface that is very easy to use. • Widgets Track your activities directly from your home screen. • Works offline and respects your privacy App doesn't require an Internet connection or account registration. Your data never leaves your phone. Neither the developers nor any third-parties have access to it. • Free and open source There are no advertisements, in-app purchases or intrusive permissions. The complete source code is also available.
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SimpleReminder
APK
Something to remember crosses your mind and an alarm or a note is the best solution you know of? Then you haven't tried SimpleReminder yet! This app lets you set up a scheduled reminder in very few steps: 1. Click "Add Reminder" on your home screen or use the Quick Settings Tile 2. Enter a message and select a time (and date) 3. Click OK A notification with your message will pop up at the time selected! Features • Use the specific launcher icon or the Quick Settings tile (Android 7.0+) to directly reach the "Add Reminder" dialog • Easily add a reminder within the next 24 hours by using just a clock widget • Choose a custom date for a reminder with "+"/"-" buttons or in a calendar • When a reminder is due, a notification is shown (customizable via notification settings) • Clear breakdown on due, upcoming and past reminders • Reschedule or edit a reminder by clicking on the notification or its entry in the list • Nagging reminders: repeat notifications in a given interval until dismissed See the website for many more planned features!
F-DroidGitHub
SkillApp
APK
SkillApp is a simple skill tracker that doesn't clutter your mind with unnecessary features, allowing you to focus entirely on your productivity. The app does not collect your data, does not connect to the internet, and does not contain ads. Features: • Completely offline: the app doesn't even have the INTERNET permission • Organize related skills into groups • Various measurement units: Hours, Kilometers, Times, Pages, Reps, Steps, Calories • Set your goals and achieve them • See your productivity at a glance with statistics • Local backup into a folder of your choosing • Stay productive at any time of day with the Dark mode
F-DroidGitHub
Sleep Timer
APK
Sleep Timer helps you fall asleep while listening to music or podcasts. When the timer stops, audio playback is gradually lowered then paused. 1. Add the Tile in the Quick Settings panel. 2. Tap the Tile to start a timer. 3. Extend, reduce or cancel the timer with the notification actions. Note: Don't look for a launcher icon, this app only provides a Quick Settings Tile. Open Source project hosted on GitHub: https://github.com/SimonMarquis/SleepTimer
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SleepTimer
APK
SleepTimer is a timer, like the ones in TVs an Hifi systems. After a specified time the devices standby mode is activated, as if the power button was shortly touched. It doesn't matter if a video or audio stream is played or another app tries to prevent the standby mode. Reactivating is possible by a short press of the power button. Features: - permanent notification showing the remaining time until standby - possibility to use Androids quick settings for pausing and resuming a countdown
F-Droid
Smoke Reducer
APK
First of all Smoke reducer (and stopper) records the distance between two times you are smoking. Then, it lengthens that time between each cigarette by telling you when to smoke. If you click the Sleep button, the time that you sleep isn't counted to the time between each alarm
F-Droid
Snaptick
APK
Introducing Snaptick – Your Simple and Free Daily Task Planner!Snaptick is a user-friendly app designed to boost your productivity by helping you organize and achieve your daily plans effortlessly. With a clean and easy-to-use interface, this app offers essential features like task creation and editing, task prioritization, a built-in Pomodoro Timer, sorting options, task analysis, and reminder notifications.******************************Features******************************📝 Create and Edit Tasks⏲️ Pomodoro Timer💾 Offline Backup🔄 Sort Tasks⏰ Analyze Free Time😴 Set Sleep Time🗓️ Manage tasks in Calendar View🎨 Material Dynamic Theme Support🔁 Repeatable Tasks with Notification🎬 Smooth Animations🎨 Modern UI with Cool Themes🌐 Available in 15+ Languages🧩 Create WidgetsDownload Snaptick now and simplify your daily planning. Boost your productivity with a clutter-free, ad-free, and efficient task planner that adapts to your unique style. Start your journey to increased productivity today!Credits App Logo Icon created by "icon_small" from www.flaticon.com
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Snow
APK
Snow is a simple, beautiful, no non-sense, cross-platform mobile app which gives reminders about upcoming programming contests. It supports 10+ platforms including codeforces, hackerrank, hackerearth etc.Features:View upcoming and ongoing contests from supported platforms10+ supported platforms, including At Coder, Codeforeces, Hacker Earth etc.Favorite a contest to receive reminders before its start timeDynamic, Dark, and Light theme supportBeautifully designed with Material3 (You) design specPrivacy focused as all data is stored on deviceEasy registrations: tap a contest's name to directly open its webpageChoose a custom accent color and express yourselfIf you're running version 1.3.0 or a prior one, you will have to uninstall the old version and install the new version, as the signing key changed (see https://github.com/sahej-dev/Snow/issues/13). Apologies for the inconvenience!
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Sobriety
APK
Track your addictions and maintain sobriety! Sobriety, the free and open source addiction tracker, is designed to be simple: You input a starting date and time, as well as a name for the addiction, and it tells you how long it's been since you last logged a relapse. You can keep notes on your recovery, track milestones, log how much time or money (or anything else) you're saving by staying sober, and view your relapse history all from one easy to use app.
F-DroidGitHub
Spickerrr
APK
A party conference is coming up and you don't want to have to constantly search for motions in the wiki? Then the Spickerrr is just right for you. Icon partially made by flaticon.com/authors/madebyoliver from www.flaticon.com
F-DroidGitHub