Calendar

284 open source Calendar apps

Widget for Trello™
APK
Widget for Trello is an android home screen widget. Choose and display lists from your Trello boards on your home screen for a quick glance at your cards.
F-DroidGitHub
WiseRadar
APK
View live weather radar imagery from the Canadian government. The weatherdata is available under a non-commercial license. With GPS integration in addition to all the features available at Environment Canada's website WiseRadar removes all the hassle from checking up on the latest storm front. This app was designed for minimal headaches and just to-the-point radar imagery. Key features include: * All radar locations Canada wide! * Pinch zoom on images to see just how close the storm is to your home * Show your exact location on the image using your device's GPS sensor!
F-DroidGitHub
Work Tracker
APK
Work Tracker is a comprehensive and user-friendly app designed to help you keep a record of your work hours. With its intuitive interface, you can effortlessly log in and out of your shift, no matter where you are. Whether you’re clocking in at the office or logging your hours from home, the app has got you covered.The app accurately tracks the time you spend working and generates detailed reports on your work hours, so you can keep a record of your daily, weekly, and monthly hours worked. With Work Tracker, you’ll never have to worry about losing track of your hours or misplacing manual time sheets.
GitHubIzzyOnDroid
WorkTimer
APK
WorkTimer is an app that helps you to structure your work time and to stay productive by applying the Pomodoro Technique®. You can set the duration of your work sessions, short breaks, long breaks and the ratio of breaks to work sessions. The app notifies you when a session is over and can even enable Do Not Disturb mode to prevent distractions. It also reminds you to drink water and can keep the screen on while in use.
F-Droid
Working Time Account
APK
Working time account is used to record your personal working hours and time off and to prepare them clearly. What can the working time account do? - Record working hours - Calculate overtime - Document absences (sick, vacation, etc.) - Record any additional values (work locations, notes, expenses, travel times, etc.) and include them in the calculation of earnings and hours - Manage vacation days - Various overviews (year, month, week and day). Manage vacation days - Display various overviews (year, month, week and day) with working time calculation in the app - Generate configurable reports as PDF, CSV and iCal files and forward them to printer, mail or messenger apps - Manage multiple workstations, projects or clients - Create data backups (also autom. two shift models (alternating shift and partial shift) - several working time models (rolling week, monthly hours, 5-day week, 6-day week, x-day week) - stamp hours with NFC - Import public holidays from .ics files and enter them automatically in empty days The app includes a manual as a PDF file, which explains all the app's functions and provides an introduction to working time calculation. What the app can't do - display advertising - display cat videos or pictures - pass on your data to third parties - place orders online - save the world Thanks to - everyone who helped me with bug reports, suggestions and criticism - Freepik.com & dr. Web for the Human Pictos - the team "Code-Troopers" for their project "BetterPickers" - the teams of IzzySoft and F-Droid for their support in publishing Required permissions - writing files to save the reports and database backups - reading files to restore backups Please note that I am not liable for the correct functioning of the software or the entered/calculated times. In case of malfunctions or other oddities, please contact me (askanimus@gmail.com) so that we can find a solution together.
F-DroidIzzyOnDroid
Working Time Alert
APK
Enter when you started working, how long was your break and see how long you have been working and when it's time to leave.
F-DroidGitHub
World Clock v2
APK
World Clock is a Flutter app that displays the current time and weather for various cities. The app uses the Material You theme to provide a modern and unique user experience.Feel free to suggest features, ideas or new cities to add over GitHub issues!Features:Displays the current time for selected cities (>180)Shows the current weather (temperature, weather conditions) for the selected cityDynamic Material You theme, adapts to the color scheme of the systemHighly customizable settingsHomescreen Widget which uses the same Material color and displays the selected city
GitHubIzzyOnDroid
W
World Weather
APK
Displays current weather and forecasts from OpenWeatherMap. Two kinds of forecast are available: 14-day daily weather and 5-day three-hourly weather. You can select any of the 200,000 cities supported by OpenWeatherMap. NonFreeNet: OpenWeatherMap service is not open.
F-DroidGitHub
WriteOn: Simple Notepad
APK
WriteOn is a note-taking app designed with simplicity and usability at its core — perfect for students and everyday use. 🛠️ Key Features: • ☁️ Backup & Restore notes (offline & WebDAV supported) • 👁️ Screen protection (prevents screenshots & previews) • 🖋️ Markdown support for rich text formatting • 🎨 Customizable themes for light/dark comfort • 📶 Works both offline and online • 🔒 Privacy-respecting – no access to your personal data • 📝 Export notes to .txt format and more • 📷 Attach and view images inside notes • 📅 Built-in calendar for instant checking • 📌 Pin notes to your notification panel (requires notification permission) • 🌈 Visually calming and intuitive interface • 🧮 Built-in calculator for easy access • 🎓 Flashcard mode for studying and others This app is a fork of Easynotes. Updates and new features are driven by user feedbacks. With more improvements coming soon.
F-DroidGitHub
YA Habit Tracker
APK
YA Habit Tracker is a simple and effective tool to help you build and maintain positive habits. It helps you track your progress and stay motivated. Features: * Create and customize habits * Track your progress with a simple interface * View your streaks * Minimalist and user-friendly design * No ads and completely free to use
F-DroidGitHubIzzyOnDroid
Yatoo
APK
Never waste time thinking about what you could do next. Yatoo's filter system shows you only what is relevant at the moment. It lets you get things done efficiently. Your todo list will stop growing infinitely. This is still in a very early stage of development. Lots of planned features are not available yet!
F-DroidGitHub
Yeeemp
APK
Yeeemp — simple tag-based event tracker used to keep track of things you do and experience. You can make different queues for movies, books, meals, or whatever you want to track. Features: - Multiple Queues: Organize events into different queues. - Detailed Records: Add tags, descriptions, and a date for each event. - Privacy Focused: Your data stays on your device. - Backup & Restore: Easily save and restore your data from a backup file.
F-DroidGitHub
YtAlarm
APK
YtAlarm is a simple alarm application using youtubedl-android. It makes be possible to wake up with a video/music which you like. This application does not use Google's developer services or service-dependent APIs such as YoutubeAPI, so it will work without problems on any Android device that meets the supported Api level(probably). Also, you do not need an account for each service to use this application.
F-DroidGitHub
Zensuren
APK
Organize teaching, manage classes, schedules, homework and grades.
F-DroidGitHub
Zest
APK
Tired of task chaos? Zest keeps you in control. 📱📅✅Zest offers a range of features to streamline your task management process:✨ Creating Categories: Organize your tasks by creating categories that make sense to you.✅ Creating Tasks in Categories: Add tasks within categories for a structured approach.📋 Sorting of Tasks: Easily categorize your tasks as completed or unfulfilled.📦 Category Archiving: Keep your workspace clean by archiving categories.📊 View Statistics: Gain insights into your productivity with task statistics.📆 View Tasks by Day: Stay on top of daily tasks and deadlines.📝 Editing: Make changes to your tasks with ease.🔔 Notifications: Receive reminders to never miss an important task.🌐 Localization: Choose your preferred language from multiple options.📂 Backup: Safeguard your data with backup functionality.🔄 Data Recovery: Restore your information in case of mishaps.🗑️ Delete All Data: Clear your slate with a single button.🎨 Beautiful DesignOur app not only enhances productivity but also offers an intuitive and visually pleasing experience. Enjoy the best of both worlds!
GitHubIzzyOnDroid
jtx Board journals|notes|tasks
APK
Elevate the power of the iCalendar standard to the next level, use the potential of the combination of journals (VJournal), notes (VJournal) and tasks (VTodo) out of one app and use DAVx5 to synchronize your entries with a CalDAV-server of your choice! iCal standard compliant Using the iCal standard ensures compatibility and interoparability with other apps and services independent of a dedicated provider or infrastructure. Journals and Notes are compliant to the definition of the VJOURNAL component, Tasks are compliant to the VTODO component. Future features will also include import and export functionalities to and from .ics files :-) Combine journals, notes & tasks Instead of using separate apps for journals, notes & tasks you can use them out of one hand, combine and link them to each other, e.g. create meeting minutes and link your tasks to them. Sync with DAVx5 Synchronize your entries with any compatible CalDAV server by using DAVx5. By using DAVx5 you are free to choose your preferred provider for CalDAV, you can even use your local server to store and synchronize your data. Note: DAVx5 is an independent app and must be acquired separately. Open Source Your data can contain private and sensitive data by their nature. We believe that individuals and companies should be able to be in full control of their own data. This means the freedom to choose where and how the data are stored, and freedom in choice of software. That is why we chose DAVx5 as a Sync Adapter to synchronise your data between your phone and any compatible CalDAV-server. The source code for jtx Board is publically available - find out more on https://jtx.techbee.at ! What does VJournal and VTodo mean? VJournal and VTodo are calendar components defined in the international standard RFC-5545, the Internet Calendaring and Scheduling Core Object Specification (iCalendar), see https://datatracker.ietf.org/doc/html/rfc5545 . This standard also defines the VEvent component, which is the standard definition for calendar event entries. jtx Board is using the VJournal component according to this iCalendar standard for journal entries and tasks. VJournals can have a defined start date, but they cannot have a duration or an end date. VJournals with a defined start date are considered journals entries in jtx Board, VJournals without start date are interpreted as notes. The VTodo component as defined in the iCalendar standard defines the technical specification of tasks, which can have a scheduled start, due and completed date as well as a progress and a completed status (amongst others). The VEvent definition is widely used, the VTodo component also found some implementations in Apps, but the VJournal component remained in the dark almost not being implemented at all by other apps and services. With jtx Board we would like to revive the usage of this standard and empower it with the possibilities to link and combine VTodos with VJournals - and in the future also VEvents! :-) Find out more on https://jtx.techbee.at
F-DroidGitHub
plees-tracker
APK
Plees Tracker is a simple sleep tracker for your Android phone. This is meant to be a very simple open source clone of PrimeNap, i.e. just track sleep start/stop times and count the average / day. Features: - It literally does nothing while you sleep, causes no battery drain. - Stores past sleeps, counts stat from them (average). - Exports/imports sleep data to/from CSV. - Can show past sleeps, can selectively edit and delete individual sleeps.
F-DroidGitHub
reReminder
APK
reReminder helps you stay focused and mindful with simple, recurring notifications. Whether you need a nudge to correct your posture, take a break, or practice mindfulness, reReminder has you covered. Features: Customizable Intervals: Set reminders for any interval, from minutes to hours. Flexible Notifications: Choose between a standard notification sound or have the reminder text read aloud with Text-to-Speech. Personalized Alerts: Customize the notification title, text, and vibration pattern to fit your needs. Simple Interface: A clean, intuitive interface built with Jetpack Compose makes setting up reminders effortless. Dark Mode: The app respects your system's theme for comfortable use in any lighting.
F-DroidGitHub
toodoo
APK
Features of toodoo Tasks: You can create, change and delete tasks. Each task has a name, a category, a priority (HIGH, MEDIUM, or LOW), and a completion-status (i.e. it is either OPEN or DONE). Optionally, each task can also have a description (arbitrary text), a due_date and a due_time. In order to avoid unintentional deletion, a task can only be deleted if it is DONE. Categories: You can create as many categories as you need. The category a task belongs to can be changed. A category can be renamed. This will affect all tasks that belong to that category. Unused categories can be deleted. I.e. deletion is only possible if the category has no tasks, and if it is not used in the current filter. Filtering tasks: It is possible to restrict the tasks displayed in the list, e.g. completed tasks only, or tasks with low priority only, etc. In general, the tasks to be displayed in the list can be filtered by * completion_status * due_date/due_time * priority * category or any combination of these. For due_date there are several predefined filter options, e.g. TODAY, CURRENT_WEEK, OVERDUE, TASKS_WITHOUT_DATE, etc. For priority and category, it is possible to filter with more than one option. E.g. you can choose to show tasks with priorities HIGH or MEDIUM. Or you can display all tasks that have either category "Family" or "Friends". Sorting tasks: The task list can be sorted by: * completion_status * due_date/due_time * priority * category * name Any sort order is possible. E.g. first by due_date/time, then by completion status, category, priority and name. Or any other order you prefer. Searching tasks: Tasks can be searched by text. The search text you enter can be applied to the task name, the task description, or both. Case-sensitive search is possible. In the list of search results, when displaying details of a task, the search string is highlighted in the task name and / or description. Convenience: There are shortcuts for often used actions. E.g. * From the context menu of a category you can jump to a list of all tasks for that category. * From the context menu of a task you can change its completion_status, set it to DONE (or OPEN respectively), or set its due date to today or tomorrow. * When the task list is filtered by "tasks due TODAY", you can easily move to the previous / next day by swiping right / left. * Similarly, by swiping you can easily move to the previous / next week (when the task list is filtered by "tasks due CURRENT_WEEK"), or to the previous / next category (when all tasks for a category are displayed). Display: Tasks due in the past, today, or in the future have different background colors, so they are easily discernible. The color scheme adapts to the display mode of the underlying android. I.e. if dark mode is selected (provided your android does support dark mode), a dark color scheme is used also for toodoo. Import / Export: All user data (i.e. tasks, categories, filters and sort criteria) can be exported to an external file (xml-format). Vice versa, data can be imported from an external file. Technical: Your data is stored locally on your device. No connection to the internet needed. No ads. No tracking. Restrictions toodoo is minimalistic. It focuses on managing, categorizing, filtering, and sorting tasks (however, more features may be added in future releases.) Thus, there are some restriction, i.e.: * The user interface is in English only. * Name of folder and file for export data are fixed (i.e. /Download/toodoo/toodooData-yyyy-mm-dd-hh-mm-ss) * Settings are currently fixed, e.g. - date format is yyyy-mm-dd, time format is 24 hours. - first day of week is Monday. - within a day, tasks without due_time are sorted behind tasks with due_time.
F-Droid
vikingGTD
APK
Inspired by the great book Getting Things Done by David Allan. This is a program I wrote because I badly needed it in order to organize my own time. I failed to find anything, on any platform, that satisfied my requirements:FreePreferably Open SourceDesigned after the principles in "Getting Things Done"Safe; no unnecessary app privileges, no enforced integration with Google (or any other) services in order to work.Fast and efficient to work withSafeguards against losing data by accidents in stressful environments (for example by cancelling a half edited task by hitting the Android back button).These requirements became my blueprint when I built VikingGTD. VikingGTD is free of eye candy and animations – but in stead very fast and responsive, also when the number of tasks grows during real use by busy people. (The database on my device has more than 8000 actions).VikingGTD implements what I believe is the most essential part of David Allens Getting Things done system: To be able to put all the stuff in your life into a system (lists) you can trust 100%.It's not a full blown GTD application - a lot of people (me included) are not ready to jump into that in one step. This application is for people who has grown out of the simple "to do apps" and "task managers" and need something a little better.Features:Any number of actions in one of any number of lists.Each action can be configured with when, where, how and at what priority. These parameters can then be used to easily sort trough and re-organize the actions.Search in lists and actions.Fast access to main functions and frequently used featuresEasy to schedule an action to any time, date, week, month, or year.Easy and fast to reschedule one or more actions.Export to / import from xml on the sdcard for backup and move to other devices. (I use Nextcloud for backing up my app data).Flexible automatic repeat of completed actions for reoccurring tasks (from "Feed the cat" the next day to "years into the future).
GitHubIzzyOnDroid
おやつ Oyatsu
APK
Display and Japanese clock time (seasonal time) calculated by location * 和暦 - Japanese calendar * 和風月名 - Japanese-style month names * グレゴリー日付 - Gregorian date * 和時計時刻(不定時法) - Japanese clock time (seasonal time) * 二十四節気 - 24 solar terms * 干支 - Chinese zodiac signs * 和時計 - Japanese clock (seasonal time) * おやつ時通知 - Notice Oyatsu-doki
F-DroidGitHub
🌜 LunaTracker 🌛
APK
Parenting can be tough. You get home from the hospital, exhausted, with this little fragile unknown thingy that has no user manual and a single way to let you know something's not ok: crying. You have to react fast, even if it's 4 AM and you have no idea of the reason behind the cries. This app is meant to log all the relevant events (diaper change, breastfeeding, baby bottle feeding, etc.), so you can always remember what was done last time and when. It supports syncing the data between different devices (using your WebDAV server for the best privacy) so that when the baby needs attention, the dad can step in, leaving the mom sleeping peacefully. Dedicated to my daughter Luna. A HUGE thanks to all our contributors. See https://git.ichibi.eu/penguin86/luna-tracker/src/branch/master/README.md NOTE: The content on this app is for informational or educational purposes only and does not substitute professional medical advice or consultations with healthcare professionals. Feature graphic ("Baby and baby milk bottle. Baby feeding."): © Vyacheslav Argenberg / http://www.vascoplanet.com/, CC BY 4.0 , via Wikimedia Commons
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