Your Calendar & ContactsEncrypted. Yours.
Sync your calendar, contacts and tasks with end-to-end encryption. As easy as iCloud. As private as Signal.
One product, one account, three views.
The same encrypted store powers calendar, contacts, and tasks. Use them in our web and Android apps, or surface them in Apple Calendar and Thunderbird via the bridge.
- 09:00Team StandupWork · 1h
- 11:001:1 with AlexWork · 1h
- 12:30Lunch · SarahPersonal · 1h
- 14:00Q1 Planning ReviewWork · 1h 30m
- 10:00Coffee with SarahPersonal · 1h
- 16:00Family callFamily · 1h
Your personal data shouldn't belong to Big Tech
Calendars, contacts, and tasks reveal the most personal details of your life: who you meet, where you go, what you plan. Unlike Google Calendar or Apple iCloud, SilentSuite encrypts everything on your device before it ever reaches a server. Not even we can read it.
Data mining
Google scans your calendar and contacts to build advertising profiles. With SilentSuite, your data is encrypted. There's nothing to mine.
Vendor lock‑in
Once your life lives inside one ecosystem, leaving becomes painful. SilentSuite uses open standards (ICS, VCF) and lets you export everything, anytime.
No real encryption
Most services claim security but still have access to your information in plaintext. Real privacy requires end‑to‑end encryption, where only you hold the keys.
Everything you need. Nothing you don't.
SilentSuite replaces iCloud and Google sync with an open, encrypted alternative that just works.
Calendar sync
Keep your calendar in sync across all your devices with zero-knowledge encryption. Nobody can read your events but you.
Contact sync
Your address book, synced and encrypted. Names, numbers, emails, all private by default.
Task management
Sync your to-dos across devices. Plan your day without handing your goals to a data broker.
Cross-platform
Web, iOS, and Android. Installable as a PWA on any device for a native app experience.
Offline-first
Your data is always available locally. Sync happens in the background when you reconnect.
Data export
Export your calendars (ICS), contacts (VCF), or everything (ZIP) at any time. No lock-in, no data hostage.
Self-hosting
Run the SilentSuite server and PostgreSQL on your own infrastructure. Connect via app.silentsuite.io or the mobile apps.
Open source
Fully auditable code. Self-host or use our managed service. Your choice.
Your encrypted calendar, in the apps you already use.
SilentSuite ships a standalone bridge that exposes your encrypted calendars and contacts to Apple Calendar, Thunderbird, and DAVx5 on Android over standard CalDAV / CardDAV.
The bridge runs locally and holds your decryption key. Plaintext never leaves your machine. Our server only ever sees ciphertext. You get the integration of an open protocol with the privacy of zero-knowledge encryption.
- Side-by-side with iCloud, Google, and Exchange calendars.
- Native macOS, Windows, Linux. Open source under AGPL-3.0.
- Per-device choice — install only on devices you trust.
Privacy by design. Not even we can read your data.
SilentSuite is built on a simple principle: your personal data should remain yours. Calendars, contacts and tasks are encrypted on your device before they ever reach the server. Built on the Etebase encryption protocol.
End‑to‑end encryption
Your data is encrypted locally using XChaCha20-Poly1305 before syncing. The server stores encrypted blobs and cannot read the contents. By design, not just policy.
Zero‑knowledge architecture
Your encryption keys are derived from your password using Argon2id and never leave your device. The server has zero knowledge of your data contents.
No tracking, ever
No ads, no trackers, and no behavioral profiling. The service is funded by subscriptions, not surveillance. Your data stays under your control, protected by strict privacy laws (GDPR).
Simple, honest pricing
No ads. No data harvesting. You pay for the service, and the service works for you. Early adopters get discounted pricing locked in for life.
Standard
/month, billed yearly
Save €10/year vs monthly
Everything you need for private sync across your devices.
- Calendar, contacts & tasks sync
- End-to-end encryption
- Unlimited devices
- Web, iOS & Android apps
- Email support
Early Adopter
/month, billed yearly
Save €7/year vs monthly
Limited time pricing for early supporters. Locked in for as long as you stay.
- Calendar, contacts & tasks sync
- End-to-end encryption
- Unlimited devices
- Web, iOS & Android apps
- Email support
- Price locked forever
Self-hosted
forever
Run the server yourself. Full control, zero cost. Optional €4/mo to support development.
- Open-source server (AGPL)
- Docker one-line deploy
- Community support
- Full data sovereignty
- No usage limits
Pricing in EUR. All plans include a free trial. Card payments support annual billing. Crypto payments are prepaid annually. Cancel anytime, no lock-in.
Safe payment
Pay by card via Stripe, or prepaid annual crypto via BTCPay.
Cancel at any time
No lock-in contracts. Cancel your subscription whenever you want.
Your data, your control
Encrypted on your device. Zero-knowledge architecture means only you can access your data.
Free trial included
Try SilentSuite free for up to 30 days. No commitment required.
One encrypted store. Every surface you use.
The same ciphertext lives on our server. Decryption happens wherever you choose to install a SilentSuite client or run the CalDAV/CardDAV bridge.
- 09:00Team StandupWork · 1h
- 11:001:1 with AlexWork · 1h
- 12:30Lunch · SarahPersonal · 1h
- 14:00Q1 Planning ReviewWork · 1h 30m
- 10:00Coffee with SarahPersonal · 1h
- 16:00Family callFamily · 1h
- 09:00Team Standup
- 11:001:1 with Alex
- 14:00Q1 Planning Review
- 16:00Pick up groceries
Common questions
Still have questions? Reach us at info@silentsuite.io