SilentSuite – Encrypted PIM Sync

End-to-end encrypted sync across web, Android, Apple Calendar, Thunderbird, and self-hosted servers. Everything is encrypted on your device before it syncs.

Self-host with the source

CalendarTasksContacts

Today

Wed, 29 Apr

Today · 4 events

09:00

Team Standup

Work · 1h

11:00

1:1 with Alex

Work · 1h

12:30

Lunch · Sarah

Personal · 1h

14:00

Q1 Planning Review

Work · 1h 30m

Tomorrow

10:00

Coffee with Sarah

Personal · 1h

16:00

Family call

Family · 1h

CalendarTasksContactsSettings

app.silentsuite.io

April 2026

MTWTFSS

123456789101112131415161718192021222324252627282930

My calendars

Personal

Work

Family

Calendar

Tasks

Contacts

Settings

TodayApr 27 to May 3, 2026

Synced

WeekMonth

New event

Mon

27

Tue

28

Wed

29

Thu

30

Fri

1

Sat

2

Sun

3

08:00

09:00

10:00

11:00

12:00

13:00

14:00

15:00

16:00

17:00

Team Standup

09:00

1:1 with Alex

11:00

Lunch · Sarah

12:30

Team Standup

09:00

Q1 Planning Review

14:00

Coffee with Sarah

10:00

Family call

16:00

Demo Day

16:00

tim@silentsuite.io · End-to-end encrypted

8 events this week

Today

Wed, 29 Apr

Today · 4 events

09:00

Team Standup

Work · 1h

11:00

1:1 with Alex

Work · 1h

12:30

Lunch · Sarah

Personal · 1h

14:00

Q1 Planning Review

Work · 1h 30m

Tomorrow

10:00

Coffee with Sarah

Personal · 1h

16:00

Family call

Family · 1h

CalendarTasksContactsSettings

Encrypted sync active

See real screenshots from every platform

End-to-end encrypted

Open source

Self-hostable

No ads or behavioral profiling

Readable on your devices. Unreadable on the server.

Calendar events, tasks, and contacts stay useful on your devices. The server in the middle only sees changing ciphertext.

Calendar

Field 1

Dentist appointment

Field 2

Tue 14:00

Field 3

Maple Street clinic

Task

Field 1

Renew passport

Field 2

Due Friday

Field 3

Personal list

Contact

Field 1

Sarah Lindqvist

Field 2

+31 6 2345 8890

Field 3

Private note

Server

Ciphertext only

Nothing readable

Calendar

Zk3q9WvLxT18JmA4c7RfPnYw2sHdK6gB0eUoiC5N

Task

H5nRw7YbG2kM9dQe0VfC4xJa8LpZ1sTuO6iEmX3K

Contact

Q8mDf2XcV5tK0aWyE9rLb1PzS7uNj4HgT3oIkR6M

Calendar

Field 1

Dentist appointment

Field 2

14:00 today

Field 3

Personal calendar

Task

Field 1

Renew passport

Field 2

Open task

Field 3

Due Friday

Contact

Field 1

Sarah Lindqvist

Field 2

Mobile number

Field 3

Address book

Your private life is visible through tiny sync records.

A calendar invite, one phone number, and a recurring task can reveal more than a profile page. SilentSuite treats those records as private data by default.

No data mining

Most productivity clouds can turn calendars, contacts, and tasks into a profile of your habits, relationships, and intent.

SilentSuite syncs encrypted records. The server gets ciphertext, not behavioral material.

No vendor lock-in

Big ecosystems make your planning data depend on one account, one app family, and one export path.

SilentSuite keeps standard formats, self-hosting, and export paths open for calendars, contacts, and tasks.

No readable sync

Many services encrypt the connection but still read your data once it lands on their servers.

SilentSuite encrypts before upload, so hosted sync never needs plaintext.

SilentSuite focuses on the daily records that reveal the most: calendars, tasks, and contacts. Use them normally. Sync them privately.

Calendars

Other clouds can read when you travel, meet, or take time off. SilentSuite syncs encrypted events the server cannot inspect.

Tasks

Contacts

Android app

Web app

Offline-first

Export anytime

Open source

Today

Wed, 29 Apr

Today · 4 events

09:00

Team Standup

Work · 1h

11:00

1:1 with Alex

Work · 1h

12:30

Lunch · Sarah

Personal · 1h

14:00

Q1 Planning Review

Work · 1h 30m

Tomorrow

10:00

Coffee with Sarah

Personal · 1h

16:00

Family call

Family · 1h

CalendarTasksContactsSettings

Encrypted sync you barely notice.

Use SilentSuite on the web or Android, or keep the desktop apps you already like through the local bridge. Your trusted device decrypts locally. The hosted server still only sees ciphertext.

One private sync path

SilentSuite, native apps, and open source clients share the same encrypted basket.

Plaintext stays on trusted devices

Native Android sync plus supported desktop bridge paths

ICS, VCF, and ZIP export paths stay open

Supported apps on Android and desktop

The native Android app and supported desktop or open-source clients share encrypted sync without sharing one bridge topology.

Apple MailAddress book

Microsoft OutlookCalendar and contacts

GNOME EvolutionOpen source desktop

KDE KontactOpen source PIM

Tasks.orgOpen source tasks

CalDAV/CardDAVOpen standards

Get SilentSuite for Android

Choose Google Play, F-Droid, an independent updater, or a signed direct release.

Google PlayInstall and update through Google PlayZapstoreOpen app store; releases may arrive laterObtainiumReceive updates from GitHub ReleasesF-DroidOfficial F-Droid repositoryInstalling elsewhere?Scan for every Android option.

Prefer a signed APK?Direct APK

Privacy by design. Not a privacy policy promise.

SilentSuite uses the Etebase protocol with XChaCha20-Poly1305 and Argon2id so the server can sync your data without reading it.

Open source and auditable

No ads or behavioral profiling

GDPR-conscious hosting

Self-host if you prefer

Learn more about security

Local encryption first

Events, contacts, and tasks are encrypted on your device before they sync.

Keys stay with you

Password-derived keys never need to leave your trusted clients.

Server sees ciphertext

Hosted sync stores encrypted blobs, not readable calendar or contact data.

Hosted encrypted sync at one clear price, or self-host the open-source server for free.

Hosted encrypted sync for your calendars, contacts, and tasks. Discounted pricing stays locked while you keep the plan.

Your Early Adopter price stays locked while you keep the plan.

Calendar, contacts, and tasks sync

End-to-end encryption

Unlimited devices

Web app, Android app, and desktop Bridge

Email support

Early adopter price lock

Get started for free7 days without a card or 30 days with a card

Self-hosted

Run the open-source server yourself with every feature unlocked.

Open-source server under AGPL

Docker one-line deploy

Community support

Full data sovereignty

View documentation

Future Standard hosted pricing is €4 per month, billed €48 annually. Early adopters keep their discounted rate.

Try 7 days without a card, or add a card for 30 days. No charge during the trial.

Cancel anytime

No lock-in contracts. Export your data whenever you want.

Your data stays yours

The payment model funds the service, not surveillance.

Pricing in EUR. The 7-day trial needs no card. The 30-day trial requires a card but is not charged during the trial. Crypto payments are prepaid annually. Cancel anytime, no lock-in.

The server syncs ciphertext. Your chosen apps turn it back into the daily context you need.

Calendar eventsFamily calls, project reviews, dentist appointments.Web, Android, Bridge, desktop calendar appsTasksRenew passport, follow ups, recurring errands.Web, Android, Bridge, compatible task clientsContactsNames, numbers, addresses, private notes.Web, Android, Bridge, desktop address booksSee real screenshots from every platform

Today

Wed, 29 Apr

Today · 4 events

09:00

Team Standup

Work · 1h

11:00

1:1 with Alex

Work · 1h

12:30

Lunch · Sarah

Personal · 1h

14:00

Q1 Planning Review

Work · 1h 30m

Tomorrow

10:00

Coffee with Sarah

Personal · 1h

16:00

Family call

Family · 1h

CalendarTasksContactsSettings

app.silentsuite.io

April 2026

MTWTFSS

123456789101112131415161718192021222324252627282930

My calendars

Personal

Work

Family

Calendar

Tasks

Contacts

Settings

TodayApr 27 to May 3, 2026

Synced

WeekMonth

New event

Mon

27

Tue

28

Wed

29

Thu

30

Fri

1

Sat

2

Sun

3

08:00

09:00

10:00

11:00

12:00

13:00

14:00

15:00

16:00

17:00

Team Standup

09:00

1:1 with Alex

11:00

Lunch · Sarah

12:30

Team Standup

09:00

Q1 Planning Review

14:00

Coffee with Sarah

10:00

Family call

16:00

Demo Day

16:00

tim@silentsuite.io · End-to-end encrypted

8 events this week

Follow the beta without giving up your inbox.

Product updates, release notes, and practical privacy tips for encrypted calendars, contacts, and tasks.

Still have questions? Reach us at info@silentsuite.io

Yes. Your calendar, contact, and task data is encrypted on your device before it ever leaves it. The server only stores encrypted blobs and has no way to read the contents. This is enforced by design, not policy.

iCloud and Google calendar and contact sync can give the provider access to readable data. SilentSuite encrypts records on your device so the hosted server only receives ciphertext. The source is public for inspection, but SilentSuite has not yet completed an independent security audit.

SilentSuite provides a hosted web app, an Android app, and CalDAV/CardDAV bridge support for compatible desktop clients. iOS is on the roadmap, coming soon, and is not currently supported.

Your data remains yours. You can export calendars as ICS, contacts as VCF, or everything as a ZIP. Hosted access ends according to the account terms, so export anything you need before account deletion.

Yes. The SilentSuite server, bridge, web app, and self-hosting code are open source under the AGPL-3.0-only license. The Android client retains its intentional GPL-3.0 licensing from its DAVx5 lineage.

Hosted data is stored on SilentSuite infrastructure, but calendar, contact, and task contents are encrypted on your device first. The server receives ciphertext and operational metadata needed to provide the service. You can self-host for infrastructure control.

Yes. You can start with a 7-day trial without a card, or add a card for a 30-day trial. You are not charged during the trial and can cancel before the first paid period.

SilentSuite uses the Etebase protocol with XChaCha20-Poly1305 for record encryption and Argon2id for password-based key derivation. Keys are derived and used on trusted devices rather than on the hosted server.

Self-hosting is a first-class option. Run the open-source server on infrastructure you control, then connect using supported SilentSuite clients and the bridge. Follow the current documentation because deployment and compatibility details can change during beta.

Private Sync, By Design. End-to-end encrypted calendars, contacts, and tasks, open source and self-hostable.

Product

Screenshots

Releases

Docs

GitHub

Company

About

Blog

Contact

Trust

Security

Privacy Policy

Terms

© 2026 silentsuite.io. All rights reserved.

Built for privacy. Open source. Your data, your control.