Apps with 'Built-in Calendar' feature

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Thunderbird
Free • Open Source
Email Client
Calendar App
Mac
Windows
Linux
BSD
AppImageHub
Snapcraft
Flathub
PortableApps.com
Haiku
Homebrew
Chocolatey
93 alternatives to Thunderbird
Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox.
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Thunderbird Features
1. Extensible by Plugins/ExtensionsThunderbird can be extended with add-ons, plugins and extensions.
2. Multiple Account supportThunderbird support multiple accounts without the need to logout and login
3. Calendar IntegrationThunderbird lets you sync your tasks and events with your calendar application.
4. Email OrganizerThunderbird allows you to take control of your inbox by filtering and control tools.
5. Dark ModeThunderbird supports dark mode for comfortable usage in low light conditions.
6. Import/Export OPML FeedsImport and export your feed subscriptions into OPML format with Thunderbird.
7. PortableThunderbird can be used from a USB stick or similar with no prior installation.
8. Support for ThemesYou can use themes and templates to change the look and feel of Thunderbird.
9. Integrated Password ManagerThunderbird lets you access all the passwords you’ve saved across your different devices.
IMAP Support
SMTP Support
FOSS
Built-in RSS reader
Add-ons
Intuitive
Graphical User Interface
POP3 Support
Customizable
Built-in Calendar
Top 3 alternatives
Microsoft Office Outlook
Paid • Proprietary
Email Client
Calendar App
Mac
Windows
Online
Android
iPhone
Android Tablet
Windows Phone
iPad
Apple Watch
Android Wear
135 alternatives to Microsoft Office Outlook
Microsoft Outlook, part of the Microsoft 365 (Office) (not to be confused with Microsoft Outlook Express), is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.
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Microsoft Office Outlook Features
1. Email OrganizerMicrosoft Office Outlook allows you to take control of your inbox by filtering and control tools.
2. Calendar IntegrationMicrosoft Office Outlook lets you sync your tasks and events with your calendar application.
3. Support for @mentionsMicrosoft Office Outlook supports the use of mentions through @ to a particular user, who will be notified personally.
4. Calendar ViewMicrosoft Office Outlook has a built-in calendar view to have a clear overview of your content over time.
5. Support for AliasesMicrosoft Office Outlook supports aliases, so you can receive email without exposing your main email address
6. Unified inboxView e-mails (or similar) from all accounts in one unified view with Microsoft Office Outlook.
7. Multiple Account supportMicrosoft Office Outlook support multiple accounts without the need to logout and login
8. Works OfflineMicrosoft Office Outlook can be used without the need to connect to the internet.
9. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
Exchange
Native application
Contacts
Built-in Calendar
Onenote Desktop Integration
Address book integration
Dropbox integration
Gmail integration
Office 365 integration
Onedrive integration
Top 3 alternatives
Microsoft To Do
Free • Proprietary
Todo List Manager
Task Management Tool
Note-taking Tool
Mac
Windows
Online
Android
iPhone
Android Tablet
Windows Phone
iPad
Microsoft Office Outlook
178 alternatives to Microsoft To Do
Microsoft To-Do is a simple and intelligent to-do list that makes it easy to plan your day. Whether it's for work, school or home, To-Do will help you increase your productivity and decrease your stress levels.
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Microsoft To Do Features
1. Dark ModeMicrosoft To Do supports dark mode for comfortable usage in low light conditions.
2. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
3. Recurring TasksMicrosoft To Do supports scheduling a task to recur at any frequency, such as daily or weekly.
Periodic Reminders
Built-in Calendar
Sharable lists
Offline mode
Sync notes
Save Attachments
Share notes
Top 3 alternatives
Posteo
Paid • Open Source
WebMail Provider
Email Client
Calendar App
Online
62 alternatives to Posteo
Posteo is an independent email service provider. Based in Berlin since 2009. With focus on security, privacy, and sustainability. They offer ad free paid email accounts for individuals and businesses.
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Posteo Features
1. Privacy focusedPosteo is considered a privacy friendly alternative.
2. Calendar IntegrationPosteo lets you sync your tasks and events with your calendar application.
3. PGP EncryptionPosteo supports PGP, an encryption system used for sending encrypted emails and files.
4. End-to-End EncryptionPosteo has E2E Encryption, for entire or parts of the app.
5. Dark ModePosteo supports dark mode for comfortable usage in low light conditions.
6. Ad-freePosteo doesn't contain any form of external advertising.
7. Email OrganizerPosteo allows you to take control of your inbox by filtering and control tools.
8. Spam FilterPosteo can detect unsolicited, unwanted and virus-infected emails, calls, files, etc.
9. Two-factor AuthenticationPosteo supports two-factor authentication (2FA).
Encrypted mail and contacts
Security focused
Transparency
Encrypted Email
Built-in Calendar
IMAP Support
Top 3 alternatives
Mailbox.org
Paid • Open Source
WebMail Provider
Email Client
Calendar App
Online
70 alternatives to Mailbox.org
Mailbox.org offers a secure e-mail account for home and business use. The domain name, me@mailbox.org, is easy to remember and can be understood anywhere in the world. They have been operating e-mail accounts for more than 20 years and are a highly reliable service provider.
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Mailbox.org Features
1. Privacy focusedMailbox.org is considered a privacy friendly alternative.
2. PGP EncryptionMailbox.org supports PGP, an encryption system used for sending encrypted emails and files.
3. No TrackingMailbox.org will not track you or use your personal data.
4. Calendar IntegrationMailbox.org lets you sync your tasks and events with your calendar application.
5. Automatic BackupMailbox.org will automatically back up your data periodically.
6. Two-factor AuthenticationMailbox.org supports two-factor authentication (2FA).
7. Spam FilterMailbox.org can detect unsolicited, unwanted and virus-infected emails, calls, files, etc.
8. Real time collaborationMultiple users can work together in Mailbox.org simultaneously.
9. Support for AliasesMailbox.org supports aliases, so you can receive email without exposing your main email address
Custom Domain
Encrypted Email
Built-in Calendar
IMAP Support
File Storage
Contacts
CalDAV Support
CardDAV Support
Support for SFTP
Supports XMPP
Top 3 alternatives
Microsoft Teams
Freemium • Proprietary
Group Chat App
Video Calling App
Team Collaboration Tool
Mac
Windows
Linux
Android
iPhone
Windows S
Android Tablet
iPad
Microsoft Office 365
230 alternatives to Microsoft Teams
Microsoft Teams is the chat-based workspace in Office 365 that integrates your team's people, content, and tools to be increase engagement and efficacy.
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Microsoft Teams Features
1. Calendar ViewMicrosoft Teams has a built-in calendar view to have a clear overview of your content over time.
2. Real time collaborationMultiple users can work together in Microsoft Teams simultaneously.
3. RemindersMicrosoft Teams allows you to set reminders for tasks, events or actions, based on parameters of time, place or condition.
4. Live Captions TranslationMicrosoft Teams can add captions to a video call, audio messages or multimedia file and translate them in real time.
5. VoiP CallsMicrosoft Teams allows you to make voice calls over Internet using the Voice over Internet Protocol (VoIP).
Microsoft Office integration
Planner
Sharepoint integration
Trello integration
Team Messaging
Azure DevOps integration
Shared Calendar
Google Drive integration
Team work
Access Control
Top 3 alternatives
Simple Calendar
Freemium • Open Source
Calendar App
Android
Android Tablet
F-Droid
97 alternatives to Simple Calendar
A simple calendar with optional CalDAV synchronization. You can easily create recurring events and setup reminders, it can also display week numbers.
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Simple Calendar Features
1. No TrackingSimple Calendar will not track you or use your personal data.
2. RemindersSimple Calendar allows you to set reminders for tasks, events or actions, based on parameters of time, place or condition.
3. Works OfflineSimple Calendar can be used without the need to connect to the internet.
4. Dark ModeSimple Calendar supports dark mode for comfortable usage in low light conditions.
5. Privacy focusedSimple Calendar is considered a privacy friendly alternative.
6. Ad-freeSimple Calendar doesn't contain any form of external advertising.
Notifications
WebDAV Support
Customizable
Built-in Calendar
Top 3 alternatives
Buffer
Freemium • Proprietary
Social Media Management Tool
Social Media Analytics
Online
Android
iPhone
Android Tablet
iPad
Google Chrome
Safari
Firefox
161 alternatives to Buffer
With Buffer all you do is put a few tweets in your Buffer and the app schedules them for you throughout the day.
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Buffer Features
1. IFTTT IntegrationYou can connect different services to automatically trigger actions within Buffer using IFTTT.
Social Media Automation
Twitter Automation
Social media integration
Schedule Instagram Posts
Time Scheduling
Safari extension
Social media calendar
Built-in Calendar
Twitter Integration
Schedule Tweets
Top 3 alternatives
Fastmail
Paid • Proprietary
WebMail Provider
Calendar App
Mail Server
Online
Android
iPhone
Android Tablet
iPad
61 alternatives to Fastmail
Fastmail provides one of the most secure and reliable email environments in the industry. Rock Solid Reliability. More safety.
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Fastmail Features
1. Support for AliasesFastmail supports aliases, so you can receive email without exposing your main email address
2. Ad-freeFastmail doesn't contain any form of external advertising.
Integrated Spam Protection
File Storage
Privacy
SMTP Support
JMAP
GDPR Compliant
CalDAV Support
IMAP Support
Sieve filtering
Built-in Calendar
Top 3 alternatives
Spike
Freemium • Proprietary
Email Client
Group Chat App
Team Collaboration Tool
Mac
Windows
Online
Android
iPhone
Chrome OS
Android Tablet
iPad
Software as a Service (SaaS)
Oculus Rift
62 alternatives to Spike
Bring your workspace together into one unified app. It’s everything your team has been looking for in a productivity and messaging app, but easier, and all with your email. Welcome to the shortest path to done.
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Spike Features
1. Unified inboxView e-mails (or similar) from all accounts in one unified view with Spike.
2. Dark ModeSpike supports dark mode for comfortable usage in low light conditions.
3. Email OrganizerSpike allows you to take control of your inbox by filtering and control tools.
4. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
5. Multiple Account supportSpike support multiple accounts without the need to logout and login
6. RemindersSpike allows you to set reminders for tasks, events or actions, based on parameters of time, place or condition.
7. Real time collaborationMultiple users can work together in Spike simultaneously.
8. Live PreviewInstantly see what your files and documents look like as you create them.
Built-in File Manager
Send later
Read confirmation
Snooze reliability
Web-Based
Tagging
Undo send
Priority Inbox
Threaded Conversations
Bulk actions
Top 3 alternatives
glimpses
Paid • Proprietary
Windows
184 alternatives to glimpses
Start writing your thoughts and memories and have them synced and backed up in the cloud. glimpses use Dropbox syncing capabilities to sync all your entries. It stores your data at Dropbox service. Just authorize with Dropbox and you're ready to go.
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glimpses Features
1. Ad-freeglimpses doesn't contain any form of external advertising.
2. Support for MarkDownglimpses supports MarkDown for document formatting.
Sync with Dropbox
Built-in Calendar
Tag based
Timeline-based
Shared links
Export to PDF
Distraction-free Writing
Discontinued
discontinued
Top 3 alternatives
Leantime
Free • Open Source
Task Management Tool
Project Management Tool
Todo List Manager
Online
Self-Hosted
468 alternatives to Leantime
Leantime is a project management system for small teams and startups. Designed to help you manage your projects from ideation to delivery. Leantime's Idea Manager allows you to store ideas, communicate them with team members, discuss and move them from idea to validation.
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Leantime Features
1. Kanban BoardLeantime allows you to organize your workflow by moving cards with drag-and-drop functionality between multiple columns.
2. Gantt-chartsLeantime allows you to visualize your project plan through a timeline with schedule bars and keep track of the work done.
3. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
Strategy planning
Built-in Calendar
Project Dashboard
User Roles
Idea evaluation
Backlog management
Milestones
Agile roadmap
Time Sheet Entry Against Assigned Tasks
Retrospective Analysis
Top 3 alternatives
Woelkli
Freemium • Open Source
Cloud Storage Service
Mac
Windows
Linux
Online
Android
iPhone
Android Tablet
iPad
78 alternatives to Woelkli
woelkli is a service that provides secure cloud storage hosted in Switzerland. Save, view, edit and share your files from anywhere in the world, from any device
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Woelkli Features
Built-in Calendar
Contacts
Top 3 alternatives
Hitask
Freemium • Proprietary
Task Management Tool
Project Management Tool
Team Collaboration Tool
Online
Android
iPhone
Android Tablet
iPad
Software as a Service (SaaS)
119 alternatives to Hitask
Hitask is the project planner for getting tasks done. Assign, prioritize, and remind tasks to your team with lists. Check progress of each project on the go and see what your organization is working at.
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Hitask Features
1. Sync with Google CalendarHitask can be synchronized with Google Calendar
2. Recurring TasksHitask supports scheduling a task to recur at any frequency, such as daily or weekly.
3. Calendar IntegrationHitask lets you sync your tasks and events with your calendar application.
4. Task Time TrackingKeep a record of time spent on a task with Hitask.
5. Works OfflineHitask can be used without the need to connect to the internet.
6. Unlimited storageHitask offers a solution with unlimited cloud storage.
Shared Calendar
Automatic time tracking
Task assignments
Android Sync
Task Tracking
Built-in Calendar
Web-Based
Outlook integration
Zapier integration
Visual Tagging
Top 3 alternatives
GoalEnforcer Hyperfocus
Freemium • Proprietary
Task Management Tool
Mac
Windows
Android
31 alternatives to GoalEnforcer Hyperfocus
Innovative Visual Goal Planner Software that brings a whole new concept of focused mind maps to goal setting, project management and task tracking. GoalEnforcer not only helps you set your goals, but it also helps you find out how to achieve your goals by combining brainstorming...
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GoalEnforcer Hyperfocus Features
1. Goal Setting GoalEnforcer Hyperfocus can set individual or group goals to meet over a particular period.
2. Gantt-chartsGoalEnforcer Hyperfocus allows you to visualize your project plan through a timeline with schedule bars and keep track of the work done.
3. Goal TrackingGoalEnforcer Hyperfocus can be used for tracking progress toward personal or business goals.
4. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
HTML reports
Status monitoring
Built-in Calendar
Export to Word
Task Scheduling
Brainstorm mode
Visual-thinking
Outlook integration
Freemind integration (export/import)
Integrated FTP client
Top 3 alternatives

Thunderbird Features

Top 3 alternatives

Microsoft Office Outlook Features

Top 3 alternatives

Microsoft To Do Features

Top 3 alternatives

Posteo Features

Top 3 alternatives

Mailbox.org Features

Top 3 alternatives

Microsoft Teams Features

Top 3 alternatives

Simple Calendar Features

Top 3 alternatives

Buffer Features

Top 3 alternatives

Fastmail Features

Top 3 alternatives

Spike Features

Top 3 alternatives

glimpses Features

Top 3 alternatives

Leantime Features

Top 3 alternatives

Woelkli Features

Top 3 alternatives

Hitask Features

Top 3 alternatives

GoalEnforcer Hyperfocus Features

Top 3 alternatives