Ever feel like your calendar knows a little too much about you?
Between work meetings, doctor’s appointments, and personal plans, your calendar holds a surprisingly detailed map of your life. And if you’re using a typical calendar app, all that sensitive info might be sitting on someone else’s servers—unprotected, unencrypted, and potentially exposed.
That’s why more people are turning to private calendar apps. These tools focus on privacy-first features, like end-to-end encryption, local data storage, and zero-tracking policies. Whether you’re managing a packed schedule or just trying to keep your plans private, there’s a growing list of calendar apps built with security in mind.
We’ve rounded up some of the best private calendar mobile apps that put your privacy front and center, without sacrificing functionality or design.
Let’s jump in. 🏃
10 Best Private Calendar Apps for Secure & Encrypted Scheduling
What Should You Look for in Private Calendar Apps?
Most people think privacy just means slapping on ‘end-to-end encryption’ and calling it a day. But truly private calendar apps go way deeper than that.
Here’s what actually matters and what most other calendar apps miss 👇
- Local-only data storage: If your calendar entries live exclusively on your device (and not in someone’s cloud), you’re already ahead. A good encrypted calendar should give you the option to store everything locally or use your own cloud provider, with no forced syncing with Big Tech
- Metadata protection: Sure, your events are encrypted, but what about the metadata? That includes titles, times, invitees, and locations. Many web apps encrypt the contents of the event but leave metadata exposed. Look for a private calendar app that encrypts everything, not just the notes
- Granular sharing controls: If you’re using shared calendar apps, ensure they don’t force you to open your entire schedule. The best calendar apps let you share one calendar, one event, or even just your availability window, without revealing who you’re meeting or why
- No data harvesting for ‘smart features’: Some calendars offer AI or ‘smart suggestions’ by scraping your data. If it’s pulling context from your inbox or location history to ‘help’ you schedule, that’s a red flag. Useful? Maybe. Private? Absolutely not
- Interoperability without compromise: Need to sync with other calendars (like Google or Outlook) but still care about privacy? Look for a private calendar app that sandboxes third-party access so you can view events from outside platforms without giving up control of your personal calendar
💡 Pro Tip: Don’t want clients or teammates knowing where you are? Set your calendar to a fixed time zone (e.g., UTC) to avoid revealing travel patterns or real-time presence. This is especially useful for journalists, whistleblowers, or digital nomads.
Best Private Calendar Apps at a Glance
| Tool | Best For | Key Features | Pricing |
| All-in-one project management with calendar integration | Time tracking, Calendar View, Automations, Workload View, Brain, Role-based sharing | Free plan available; Customization available for enterprises | |
| Proton Calendar | Encrypted scheduling and private event management | End-to-end encryption, ECC Curve25519, encrypted invites, metadata protection | Free plan available; Customization available for enterprises |
| Tuta Calendar | Cross-platform access and zero-knowledge privacy | Quantum-safe encryption, open-source, no personal data required, advanced repeat rules | Free plan available; Customization available for enterprises |
| Any.do | Unified task and calendar management across devices | Multi-view layouts, task-calendar sync, alerts, drag-and-drop rescheduling | Free plan available; Customization available for enterprises |
| Cal.com | Open-source scheduling with deep customization | Self-hostable, modular setup, 65+ integrations, group booking pages | Free plan available; Customization available for enterprises |
| Apple Calendar | Seamless cross-device sync for Apple users | Natural input, Siri integration, shared calendars, iCloud sync | Free |
| TimeTree | Shared calendars between families, couples, or teams | Shared events, in-event chat, shared memos, notifications | Free plan available; Customization available for enterprises |
| Etar Calendar | Open-source calendar with offline access for Android users | Offline support, multiple views, ICS file import/export | Free |
| Nextcloud Calendar | Privacy-focused teams needing a self-hosted tool | CalDAV sync, self-hosting, tool integrations, color-coded events | Free |
| Joplin Plugin | Organizing Joplin notes visually | Date-linked note view, keyboard navigation, visual timeline of notes | Free |
| EteSync | Encrypted cross-device calendar and data syncing | E2EE sync, change journaling, DAVx⁵ support, cross-platform | Free plan available; Customization available for enterprises |
| Zoho Calendar | Offline access for Android users seeking an open-source calendar | Group calendars, resource booking, multiple views, recurrence & RSVP | Custom pricing |
The Best Private Calendar Apps to Use
Now that you know what to look for, here are the best private calendar apps that combine strong encryption, thoughtful design, and real control over your data:
1. (Best all-in-one project management tool with calendar integration)
First on the list is (the everything app for work)—because juggling project deadlines, personal tasks, and team schedules shouldn’t mean sacrificing privacy.
Most project management calendars are either too rigid or too leaky (great for collaboration, not so great for controlling who sees what). But Crobust powerful project management software gives you granular visibility settings and user permissions.
For starters, the Calendar integrates deeply with your tasks, docs, and workflows while offering tight-knit privacy controls.
Even better, there’s time tracking, infinite horizontal scroll, and visibility into work locations and hours for enhanced team communication. You can also safely share calendars using private or public links.
📌 Getting started with Calendar:
- Connect your existing calendar: Click on the calendar icon at the top to link your current calendar
- Explore the interface: Familiarize yourself with the task hub in the sidebar and the daily snapshot feature
- Start scheduling: Use the ‘Meet with’ feature to schedule meetings effortlessly
- Add tasks: Start adding your tasks to the calendar and use the automatic time blocking feature
Add a task to your priority list, and will suggest the best time to work on it based on your schedule. If you miss a task, will re-block time for it. No manual rescheduling, no forgotten to-do lists.
With Brain, get real-time updates on recent and upcoming tasks, and block time for anything pending or important.
📮 Insight: 18% of our survey respondents want to use AI to organize their lives through calendars, tasks, and reminders. Another 15% want AI to handle routine tasks and administrative work.
To do this, an AI needs to be able to: understand the priority levels for each task in a workflow, run the necessary steps to create tasks or adjust tasks, and set up automated workflows.
Most tools have one or two of these steps worked out.
However, has helped users consolidate up to 5+ apps using our platform! Experience AI-powered scheduling, where tasks and meetingefficientlybe easily allocated to open slots in your calendar based on priority levels. You can also set up custom automation rules via Brain to handle routine tasks. Say goodbye to busy work!
For further planning and prioritizing tasks, Calendar View gives you a visual layout of everything you need to get done, organized by day, week, or month.
It’s perfect for dragging, dropping, and adjusting tasks as timelines shift, helping you stay productive without losing clarity.
To get started quickly, use the Calendar Planner Template—perfect for beginners and ready to go in seconds.
best features
limitations
- It may come with a learning curve due to the vast number of features
pricing
free forever
Best for personal use
Free Free
Key Features:
unlimited
Best for small teams
$7 $10
Everything in Free Forever plus:
business
Best for mid-sized teams
$12 $19
Everything in Unlimited, plus:
enterprise
Best for many large teams
Get a custom demo and see how aligns with your goals.
Everything in Business, plus:
* Prices when billed annually
ratings and reviews
- G2: 4.7/5 (10,000+ reviews)
- Capterra: 4.6/5 (4,000+ reviews)
What real-life users are saying about ?
Here’s what Heath Hayden, Professional Development Coordinator, Tacoma Community College, had to say.
2. Proton Calendar (Best for encrypted scheduling and private event management)
Proton Calendar is a privacy-first task scheduling tool built by Proton Mail. It uses end-to-end encryption to protect everything from event titles to attendee names, so even Proton can’t read your data.
With open-source code, it’s designed for anyone who wants complete control over their calendar privacy without sacrificing usability. It is ideal for professionals, teams, and privacy-conscious users who want secure, no-compromise scheduling.
Proton Calendar best features
- Secure event data with high-performance encryption in real time using elliptic curve cryptography (ECC Curve25519)
- Keep attendees in the calendar app private with encryption that hides participant identities, even from Proton itself
- Verify invites with cryptographic signatures, ensuring the authenticity of the sender and preventing data tampering
Proton Calendar limitations
- Some have said it doesn’t support offline appointment creation, which limits flexibility on the go
- Others report frustrations with basic features like search, autofill for locations, and travel time planning
Proton Calendar pricing
- Free Forever
- Mail Plus: $4.99/month
- Proton Unlimited: $12.99/month
- Proton Duo: $19.99/month
- Mail Essentials: $7.99/month per user
- Mail Professional: $10.99/month per user
- Proton Business Suite: $14.99/month per user
Proton Calendar ratings and reviews
- G2: 4.4/5 (100+ reviews)
- Capterra: 4.6/5 (100+ reviews)
3. Tuta Calendar (Best for cross-platform access and zero-knowledge privacy)
Tuta Calendar (previously called Tutanota) is a zero-knowledge calendar app that uses quantum-safe encryption to ensure your appointments, reminders, and recurring events remain completely private.
Tuta also ensures anonymity by not requiring any personal data for sign-up and running on fully open-source infrastructure. It’s also built entirely in-house (no third-party trackers or closed-source components).
Tuta Calendar best features
- Use features like detailed event creation, customizable reminders, and advanced repeat rules
- Protect against future quantum threats with next-gen encryption protocols like Kyber-1024 and x25519
- Monitor and remotely close calendar sessions from any device, with IPs encrypted and auto-deleted after a week
Tuta Calendar limitations
- Some have said the search functionality is limited and doesn’t deliver fast or comprehensive results
- Others report that the lack of offline access makes it harder to view or edit calendars on the go
Tuta Calendar pricing
- Free Forever
- Revolutionary: $3.29/month
- Legend: $8.76/month
- Essential: $8.14/month/user
- Advanced: $10.85/month/user
- Unlimited: $16.27/month/user
Tuta Calendar ratings and reviews
- G2: Not enough reviews
- Capterra: Not enough reviews
What real-life users are saying about Tuta Calendar?
A G2 review says,
4. Any.do (Best for unified task and calendar management across devices)
Any.do’s calendar syncs with Google, Outlook, and iCloud to unify your schedule and task list into one cohesive space. You get a single interface where your to-dos live right next to your meetings, making it easier to manage both work and personal life.
Plus, it offers multiple calendar views to help you focus on today or zoom out to see the week or month ahead. All changes are reflected in your external calendar, but you can manage them inside this private calendar app with drag-and-drop rescheduling, quick edits, and built-in alerts.
Any.do best features
- Switch between daily, 3-day, weekly, and monthly views depending on your planning needs
- Update due dates, times, recurrence, and details right from the calendar.
- Easily share calendars across family or team using synced accounts or subscription links
Any.do limitations
- Users must create separate calendar events to visually represent task durations, which adds extra steps
- While the iPhone app supports iCloud, the Mac desktop version lacks Apple Calendar support, limiting cross-device syncing
Any.do pricing
- Free Forever
- Premium: $7.99/month
- Family: $9.99/month (for 4 members)
- Teams: $7.99/month per member
Any.do ratings and reviews
- G2: 4.2/5 (190+ reviews)
- Capterra: 4.4/5 (180+ reviews)
5. Cal.com (Best for open-source scheduling with deep customization)
Cal.com is an open-source calendar scheduling tool built for individuals, teams, and businesses who want complete control over their booking experience. Instead of layering features over a fixed system, it gives you a modular structure to build your own.
It’s also privacy-focused, self-hostable, and integrates with 65+ tools—from Stripe to Google Calendar—making it a flexible choice for both personal and professional use.
Cal.com best features
- Set daily limits, buffers before and after meetings, minimum notice periods, and working hours
- Use round-robin logic, group booking pages, and routing forms to simplify coordination
- Add scheduling blocks to your website or product without redirecting users elsewhere
Cal.com limitations
- Users report that the booking embed doesn’t auto-resize to containers, breaking layouts on many sites
- Others say that calendar invites are basic and non-customizable, leading to poor display, especially for Microsoft 365 users
Cal.com pricing
- Free Forever
- Teams: Starts at $15/month/user
- Organizations: Starts at $37/month/user
- Enterprise: Custom pricing
Cal.com ratings and reviews
- G2: 4.3/5 (30+ reviews)
- Capterra: Not enough reviews
What real-life users are saying about Cal.com?
A G2 review says,
6. Apple Calendar (Best for Apple ecosystem users who want seamless sync across devices)
Apple Calendar is a built-in scheduling app for macOS, iOS, and iPadOS. It’s tightly integrated with the Apple ecosystem—meaning it works seamlessly with Mail, Siri, and even apps like Maps and Reminders.
All events are synced automatically across all Apple devices via iCloud, so if you add an appointment on your Mac, it’ll instantly appear on your iPhone or Apple Watch.
Apple Calendar best features
- Add locations, alerts, notes, and invitees directly to events with natural language input
- Create shared calendars with family or teams and manage permissions easily
- Use Siri voice commands to add events hands-free and get reminders
Apple Calendar limitations
- Only available on Apple devices—no official Android or Windows support
- Lacks built-in scheduling links or polling options for group meetings
Apple Calendar pricing
Apple Calendar ratings and reviews
- G2: Not enough reviews
- Capterra: Not enough reviews
🧠 Fun Fact: Contrary to popular belief, Monday mornings are not unfavorable for meetings. Studies have shown that 11 AM on Mondays is the time slot with the highest booking rate, as employees prefer to manage meetings early in the week.
7. TimeTree (Best for shared calendars between families, couples, or small teams)
TimeTree is a collaborative calendar app built for people who plan together. Instead of siloing individual schedules, TimeTree lets multiple users view, add, and edit events on shared calendars from any device.
In fact, users can add notes, comments, and photos to events, turning each entry into a conversation hub. It’s lightweight, intuitive, and built for the kind of everyday planning most calendar apps overlook.
TimeTree best features
- Comment directly on events to discuss plans, updates, or logistics within the calendar
- Receive event reminders as push notifications, emails, or in-app alerts for better coordination
- Use the Shared Memo space for ongoing conversations unrelated to specific events
TimeTree limitations
- Shared lists can be harder to access after recent updates, with bugs preventing direct access and causing unsaved changes
- The homepage widget has display issues in dark mode, making text unreadable due to poor color contrast
TimeTree pricing
- Free Forever
- Premium: $4.49/month
TimeTree ratings and reviews
- G2: Not enough reviews
- Capterra: Not enough reviews
What real-life users are saying about TimeTree?
A Google Playstore review says,
8. Etar Calendar (Best for Android users seeking an open-source calendar with offline access)
Etar Calendar is a free, open-source calendar application for Android devices. It is designed to provide a user-friendly and privacy-respecting alternative to proprietary calendar apps. Emphasizing simplicity and adherence to modern design principles, Etar offers a range of features to help users manage their schedules effectively.
Etar Calendar best features
- Choose from month, week, day, and agenda views to visualize events and appointments
- View upcoming events directly on the home screen with a widget
- Share calendars via ICS files and import and export calendar data to and from an SD card
Etar Calendar limitations
- Some say the app frequently asks for access to contacts and background activity, which can be frustrating for users who prefer tighter control
- Some known bugs have remained unresolved for a long time, which affects usability
Etar Calendar pricing
Etar Calendar ratings and reviews
- G2: Not enough reviews
- Capterra: Not enough reviews
9. Nextcloud Calendar (Best for privacy-focused teams wanting a self-hosted scheduling tool)
Nextcloud Calendar is a free, open-source calendar app that works with the broader Nextcloud ecosystem. It’s a self-hosted tool, so you keep full control of your schedule and data on your own server. You can sync it with other devices using CalDAV and manage all your events in one place.
This simple calendar app connects easily with other Nextcloud tools like Contacts and Talk, making it great for coordinating with teams or families. And since everything stays on your server, it offers strong privacy without relying on third-party services.
Nextcloud Calendar best features
- Sync your calendar across devices and apps that support CalDAV, like Thunderbird, Apple Calendar, or Android apps
- Integrate Nextcloud Contacts, Talk, Mail, and Tasks for a unified scheduling experience
- Manage personal, work, and shared calendar apps in one dashboard with color-coded event separation
Nextcloud Calendar limitations
- Users say the interface can feel laggy at times, especially when managing larger calendars or shared views
- Some have said their data was lost due to server issues, highlighting the risks of unreliable self-hosting setups
Nextcloud Calendar pricing
Nextcloud Calendar ratings and review
- G2: 4.4/5 (100+ reviews)
- Capterra: 4.6/5 (400+ reviews)
What real-life users are saying about Nextcloud Calendar?
A G2 review says,
10. Joplin Calendar Plugin (Best for organizing Joplin notes visually)
Joplin Calendar Plugin adds a simple calendar view inside the Joplin note-taking app, allowing you to see notes organized by their creation or last modified date. You can click on any date to quickly pull up all notes linked to that day, making it easier to manage your writing or journaling timeline.
It’s especially helpful if you use Joplin for daily logging, meeting notes, or time-based planning, since it gives you a clear visual reference of your note activity over time.
Joplin Calendar Plugin best features
- View which days have notes created or modified, with visual indicators for volume
- Navigate the calendar and notes list using intuitive key commands for faster control
- Optionally show notes that include the selected date in their title (based on Joplin’s date format)
Joplin Calendar Plugin limitations
- Related notes are still an experimental feature and may slow down performance in large notebooks
- Some have said that date-based related note searches are limited to a 120-day range
Joplin Calendar Plugin pricing
Joplin Calendar Plugin ratings and reviews
- G2: Not enough reviews
- Capterra: Not enough reviews
11. EteSync (Best for encrypted cross-device calendar, contact, task, and note syncing)
EteSync is an end-to-end encrypted sync solution for calendars, contacts, tasks, and notes. Unlike most sync services, which store data in plain text on cloud servers, EteSync encrypts everything before it leaves your device.
You can use it across devices with support for Android, iOS, desktop apps, and even browser extensions. It works with CalDAV-compatible apps and integrates with open-source tools like DAVx⁵. All changes are journaled, meaning you can track every edit or restore deleted entries if needed.
EteSync best features
- Securely sync calendars, contacts, tasks, and notes, with zero-knowledge architecture and end-to-end encryption
- Work with any apps that are DAVx⁵ and CalDAV/CardDAV-compatible, including Etar and Tasks.org
- Keep a tamper-proof history of every update with encrypted change journaling
EteSync limitations
- Users have reported severe usability and reliability issues across various platforms, including synchronization conflicts
- Due to iOS restrictions, EteSync cannot create new accounts on the device and can only sync to existing ones
EteSync pricing
- Free Forever
- Personal: $2/month (billed yearly)
- Supporter: $4/month (billed yearly)
- Organization: Custom pricing (for medium and large organizations)
EteSync ratings and reviews
- G2: Not enough reviews
- Capterra: Not enough reviews
What real-life users are saying about EteSync?
A Google Playstore review says,
12. Zoho Calendar (Best for internal team scheduling and syncing across the Zoho ecosystem)
Zoho Calendar is a collaborative online calendar designed for organizing personal and professional schedules. It allows users to create events, invite participants, manage permissions, and set reminders.
The application offers multiple views as well and facilitates team collaboration through features like group calendars and resource booking.
Zoho Calendar best features
- Visualize schedules across various views like Day, Week, Month, Agenda, and Year
- Book meeting rooms and other resources directly within the calendar when scheduling events
- Create events with options to invite attendees, set recurrences, manage RSVPs, and add conferencing details
Zoho Calendar limitations
- Users say inviting internal groups doesn’t show individual availability, making team planning difficult
- Some have noted that event notifications don’t reliably reach mobile numbers, causing missed alerts
Zoho Calendar pricing
Zoho Calendar ratings and reviews
- G2: 4.4/5 (50+ reviews)
- Capterra: Not enough reviews
Schedule Meetings Securely With
When it comes to managing your time and protecting your data, you must pick tools carefully.
Whether you’re a freelancer keeping personal commitments private or part of a remote team juggling meetings across time zones, a private calendar app can give you back control, without sacrificing functionality.
And if you’re looking for an all-in-one solution that combines scheduling, task management, AI assistance, and airtight security? makes a strong case. It’s not just a calendar—it’s your tasks, reminders, deadlines, docs, and team collaboration, all in one secure place.
Privacy matters. Productivity does, too. With , you don’t have to choose.
Sign up today!
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