Your workplace. Your data. One platform.
Stacular brings mail, calendar, contacts, and messaging into one privacy-first workspace — EU-hosted, per-tenant encrypted, self-hostable.
Enterprise security with the simplicity of a consumer app.
Early access — Stacular is in active development with pilot organizations.
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Everything your team needs. Nothing you don't control.
Stacular is a privacy-first European workplace platform: the collaboration basics your team lives in — mail, calendar, contacts, and messaging — built as one coherent product rather than four tools bolted together.
Built in Europe, hosted in Europe, and designed so your organization's data stays yours — encrypted per tenant, isolated at the database level, with self-hosting on the roadmap for teams that want full control.
We're in early access and onboarding pilot organizations now.
Why Stacular
Private by design
EU data sovereignty isn't a compliance checkbox — it's the architecture. Per-tenant encryption, database-level isolation, audit logs, and no ads, no tracking, no data resale. Ever.
Instant workspace
Sign up and get a working workspace immediately — no weeks of IT setup, no consultants. Start personal, create an organization when your team is ready, and everything works the same in both.
One platform, not twenty tabs
Check your inbox, message a colleague, and share a calendar — in one coherent app on web and mobile, instead of a patchwork of single-purpose tools.
Yours to host
SaaS by default, self-hosted when you need it. Stacular builds on open standards like JMAP, and keeps your mail and messages in your own database — never locked into a proprietary silo.
What's inside
Mail & Calendar
A real mail server under the hood — not a wrapper around someone else's. Mail, calendar, and contacts share one account on an open-source backbone speaking JMAP, an open standard, so standard mail clients keep working too.
Messaging
Team chat built natively into your workspace — real-time, and stored in your own database. Your conversations belong to your organization, not to us.
Enterprise foundations
Organizations, roles, and multi-workspace membership are built in. Audit logs, SSO, and self-hosting are on the path to general availability — with a free tier for small teams as we move out of early access.