1Private Calendar

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Private Calendar

End-to-end encrypted

Encrypted calendar. Your appointments remain private.

Each appointment is encrypted on your device before it is synced. The server only stores ciphertext. Only you and the people you share a calendar with can read it.

Start for free → What is encrypted?

31TodaySeptember 2026Week

MON

14

TUE

15

WED

16

THU

17

FRI

18

SAT

19

SUN

20

GMT
+02

Munich Trade Fair

Oktoberfest

09:00

10:00

11:00

12:00

13:00

14:00

15:00

16:00

17:00

18:00

Office

08:00

Dentist

17:00

Standup

08:30

Workshop

09:30

Yoga

12:30

Nursery parents’ evening

16:00

Run

08:00

Customer call

10:00

Taxes

14:00

Physio

16:30

Home office

08:00

Design review

13:30

Climbing

17:30

Standup

08:30

Family doctor

11:00

Drive to Rosenheim

15:00

Beer garden

17:00

Trip to Tegernsee

08:30

Hiking

09:30

Grandma turns 80

15:00

Brunch

10:30

Football

14:00

31TodaySeptember 2026Month

MON

TUE

WED

THU

FRI

SAT

SUN

31

Office

1

Standup

Yoga

2

Customer call

Cinema

3

Home office

Climbing

4

Standup

Dentist

5

Flea market

6

Football

7

Office

Run

8

Standup

9

Workshop

Physio

10

Home office

Choir rehearsal

11

Standup

Drive to Rosenheim

12

Hiking

13

Brunch

Start of school

14

Office

Dentist

15

Workshop

Yoga

Nursery parents’ evening

16

Run

Taxes

Physio

17

Home office

Design review

Climbing

18

Family doctor

Drive to Rosenheim

Beer garden

19

Trip to Tegernsee

Grandma turns 80

20

Brunch

Football

Munich Trade Fair

Oktoberfest

21

Office

22

Standup

Yoga

23

Customer call

Submit taxes

24

Home office

Climbing

25

Standup

Trip to Passau

26

Wedding Anna & Tim

27

Football

Oktoberfest

28

Flight to Split

29

30

1

2

Return flight

3

4

Brunch

Oktoberfest

Holiday Croatia

Day of German Unity

31Today2026Year

Jan

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Ski holiday

Feb

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Carnival holidays

Mar

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Business trip to Hamburg

Apr

1

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Easter holidays

May

1

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Whitsun holidays

Jun

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Whitsun holidays

Berlin Trade Fair

Jul

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Aug

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Summer holidays

Holiday Lake Garda

Sep

1

2

3

4

5

6

7

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10

11

12

13

14

15

16

17

18

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25

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Summer holidays

Munich Trade Fair

Oktoberfest

Holiday Croatia

Oct

1

2

3

4

5

6

7

8

9

10

11

12

13

14

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Oktoberfest

Nov

1

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Autumn holidays

Workshop Vienna

Dec

1

2

3

4

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Christmas holidays

Week view · Tap the phone

Calendar content end-to-end encrypted Hosted in Germany Documented cryptography

31TodaySeptember 2026Week

Week 38

MON

14

TUE

15

WED

16

THU

17

FRI

18

SAT

19

SUN

20

GMT
+02

Munich Trade Fair

Oktoberfest

09:00

10:00

11:00

12:00

13:00

14:00

15:00

16:00

17:00

18:00

Office

08:00

Dentist

17:00

Standup

08:30

Workshop

09:30

Yoga

12:30

Nursery parents’ evening

16:00

Run

08:00

Customer call

10:00

Taxes

14:00

Physio

16:30

Home office

08:00

Design review

13:30

Climbing

17:30

Standup

08:30

Family doctor

11:00

Drive to Rosenheim

15:00

Beer garden

17:00

Trip to Tegernsee

08:30

Hiking

09:30

Grandma turns 80

15:00

Brunch

10:30

Football

14:00

31TodaySeptember 2026Month

MON

TUE

WED

THU

FRI

SAT

SUN

31

Office

1

Standup

Yoga

2

Customer call

Cinema

3

Home office

Climbing

4

Standup

Dentist

5

Flea market

6

Football

7

Office

Run

8

Standup

9

Workshop

Physio

10

Home office

Choir rehearsal

11

Standup

Drive to Rosenheim

12

Hiking

13

Brunch

Start of school

14

Office

Dentist

15

Workshop

Yoga

Nursery parents’ evening

16

Run

Taxes

Physio

17

Home office

Design review

Climbing

18

Family doctor

Drive to Rosenheim

Beer garden

19

Trip to Tegernsee

Grandma turns 80

20

Brunch

Football

Munich Trade Fair

Oktoberfest

21

Office

22

Standup

Yoga

23

Customer call

Submit taxes

24

Home office

Climbing

25

Standup

Trip to Passau

26

Wedding Anna & Tim

27

Football

Oktoberfest

28

Flight to Split

29

30

1

2

Return flight

3

4

Brunch

Oktoberfest

Holiday Croatia

Day of German Unity

31Today2026Year

Jan

1

2

3

4

5

6

7

8

9

10

11

12

13

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New Year

Epiphany

Ski holiday

Feb

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Carnival holidays

Mar

1

2

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5

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10

11

12

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17

18

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Business trip to Hamburg

Holidays

Birthday

Apr

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10

11

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13

14

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18

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Easter holidays

Good Fri.

Easter Mon.

May

1

2

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5

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May Day

Ascension

Whit Sun.

Whitsun holidays

Jun

1

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Whitsun holidays

Corpus Chr.

Berlin Trade Fair

Jul

1

2

3

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5

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Party

Aug

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Summer holidays

Holiday Lake Garda

Assumption

Sep

1

2

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10

11

12

13

14

15

16

17

18

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20

21

22

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25

26

27

28

29

30

Summer holidays

Munich Trade Fair

Oktoberfest

Holiday Croatia

Oct

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

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Oktoberfest

Holiday

Unity Day

Baptism

Nov

1

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5

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10

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12

13

14

15

16

17

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Autumn holidays

All Saints

Workshop Vienna

Dec

1

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Christmas holidays

Xmas Day

Boxing Day

Weekly view

What is encrypted

What makes up your calendar is encrypted.

We also say what the server sees. An account needs an email address and sign-in details – it doesn’t need your appointments.

End-to-end encrypted

Title, location and description
Date, time and recurrence
Tasks and reminders
Calendar and master key (only encrypted on the server)
Links to external iCal subscriptions and their content

Visible to the server in plain text

Your email address
Calendar IDs and which month a block belongs to
When you changed something
Who you share calendars with
Sign-in times with IP address; for Premium, also subscription and billing data

The complete list, including instructions for testing, is under Check encryption yourself.

Features

Everything a calendar needs – without spying on you.

Appointments, tasks and reminders, neatly organized. And underneath, an architecture that treats your privacy not as an option, but as its foundation.

Store and sync end-to-end encrypted

For storage and synchronization, your events are encrypted on your device before being sent to the server. Calendar and master keys reach the server only in encrypted form, never in plain text.

This is how Private Calendar protects your appointments

Encrypted before it leaves your device.

Calendar content is stored as encrypted blocks. With external iCal link subscriptions, the server receives neither the private link nor the source content in plain text.

Encrypted on your device

Every appointment is encrypted locally with AES-256-GCM before it is synchronized.

Sync encrypted

The server only stores calendar content as encrypted blocks. Link subscriptions are loaded directly from a signed-in Android device or iPhone.

Only you have the key

The key stays with you. Without it, the data remains permanently unreadable – for everyone.

Check open source cryptography yourself

The published security modules are open source under Apache 2.0. Source code, specifications and verification steps are available.

Check encryption yourself View source code

Pricing

Start for free. More if needed.

Both plans use the same end-to-end encryption. Premium increases limits and adds iCal subscriptions, which the Android and iPhone apps retrieve directly and encrypt before synchronization.

Free

€0

Permanently free, with no time limit.

2 calendars of your own
Appointments, tasks & reminders
Own/imported content: E2E & Sync
25 MB storage
Export (JSON/ICS)

Start for free

Premium

€18.00 / year

Equivalent to €1.50 per month (introductory price) · or monthly at €2.99 · cancellable with one month’s notice after the initial term.

Up to 25 calendars of your own
Share your own calendars
External iCal subscriptions
Widgets for Android and iPhone
Booking links: share free times, up to 15
500 MB storage
Multiple scheduled reminders*
Task deadlines
Working time counter
Sleep window with sleep reminder
Twilight in the daily and weekly grid

View prices

*Notifications are not guaranteed and should not be the sole control of critical deadlines. Germany: Final prices, payment via Stripe, no VAT under § 19 UStG. Austria, Switzerland, Finland, Denmark, the Netherlands, Ireland and Sweden: The taxes applicable there are added to these prices; payment via Link. The pricing page shows the total price by country selection. New subscriptions only for these eight countries. · 14-day right of withdrawal.

Frequently asked questions

Good to know.

What does “end-to-end encrypted” mean?

Data is encrypted on your device before storage and synchronization. Your calendar and master keys are generated there and reach the server only in encrypted form; your password protects access to them. Events, tasks and their details synchronize as encrypted calendar blocks. Neither the operator nor anyone who obtains the database can read those blocks. Decryption takes place locally on your devices and, for explicitly shared content, on recipients’ devices. This uses AES-256-GCM and local key management whose source code is published for review.

Can the operator read my appointments?

No. The server only receives appointments, tasks and their details as encrypted blocks. The keys are created on your device and only reach the server encrypted. What the server still sees, such as your email address and change times, is listed in full under Check encryption.

What happens if I forget my password?

Then you restore access with the recovery key that you receive when registering. Without a password and recovery key, the data remains unreadable, even for us. So keep it safe.

What encryption is used?

AES-256-GCM for the content, PBKDF2 and HKDF for the key derivation, plus optional two-factor authentication. Cryptography specification and source code are published: View source code.

Can I use Private Calendar for free?

Yes. The free plan includes two calendars of your own and 25 MB of storage, with no time limit. That's enough for tens of thousands of appointments, or ten appointments per week for many decades. Premium is optional, increases limits and adds features such as calendar sharing, iCal subscriptions and booking links.

Platforms

Runs where you are.

One account, the same personal and imported appointments everywhere, synchronized and end-to-end encrypted. The options differ per platform.

Desktop

Windows · macOS · Linux

Fully supported

Runs in current versions of Chrome, Firefox, Edge and Safari. A PWA installation is possible as long as the browser offers it; browser reminders only work when the application is open.

Android

Native app · Android 8 or later

Fully supported

Native app with background sync, reminders and direct updating of external iCal subscriptions. Android, permissions and energy saving rules can delay retrieval and delivery.

GET IT ONGoogle Play

iPhone & iPad

Native app · iOS 17 or later

Fully supported

Native app with background sync, reminders and direct updating of external iCal subscriptions. iOS, permissions and energy saving rules can delay retrieval and delivery.

Your data is encrypted on every device – the key stays with you, whichever device you sign in on.

Ready for a calendar that's yours?

Set up in minutes. Calendar content end-to-end encrypted, no ad trackers. The Android app is available on Google Play and the iPhone app is available on the App Store. Mobile apps update link subscriptions directly.

Start now for free →