Serenity

Decentralized Application

End-to-end encrypted, offline-first collaborative notes app using CRDTs (secsync architecture); relay never sees plaintext

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Details

License Open source client (github.com/serenity-kit); secsync library open source
Dev Status 🟢 Active
Dev Status Detail Released (active, small-team; secsync beta)
Owner Nik Graf / Naisho GmbH (serenity-kit)
Governing Body Company-controlled (Naisho GmbH)
Country Austria
Start Year 2019
Stack TypeScript + React Native
Funding NGI Assure (via NLnet, grant for secsync Aug 2021 — Aug 2024)
Last Investigated Mar 9, 2026

Topology view

This tool in the centre and the things it is directly related to. Each line names the kind of relationship.

Topology view: SerenityThis tool in the centre and the things it is directly related to. Each line names the kind of relationship.SerenityYjs (Built on)YjsMatrix (Inspired by)Matrix
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Use Case Domains

Communication Group Formation & Governance

Affordances

Consent-based audiences Composable groups

Decentralized Application Attributes

Origins E2E encrypted notes; inspired by Signal/Matrix encryption applied to collaborative documents
Database CRDTs (Yjs via secsync; encrypted snapshots + updates)
Query Language N/A
Data Formats Custom (encrypted CRDT snapshots + updates; secsync protocol)
Collaborative Live Editing Yes (CRDT-based, E2EE via secsync; cursor awareness)
Rich Text Editing Yes
Mobile Support Yes (iOS native; Android in development)
Web Support Yes
Native Apps Yes (macOS via React Native)
Terms Self-hosting + Freemium SaaS
Funds NGI Assure grant (undisclosed amount; run by Nikolaus Graf / Naisho GmbH)
Based On secsync (E2EE CRDT relay architecture) built on Yjs
Use Case Category Note-taking + Collaboration
User Interface Type Document-centric
Offline Capabilities Full functionality offline (local-first; secsync designed for offline-first)
Collaboration Features Real-time editing (E2EE), sharing via contacts, cursor awareness
Data Portability Partial (CRDT document data portable; not yet implemented in prototype)
Integration Ecosystem N/A
Web2 Data Export N/A
Prosocial Coherence N/A
Economic Flows N/A
Governance & Decision Making Company-controlled (Naisho GmbH, small team)
Media / Publishing No
Knowledge Management No
Sensemaking No
Project Management No
Data Sovereignty Full (E2E encrypted on device; relay never sees plaintext; user-controlled keys)

Relationships

How this tool connects to other tools and organizations, from relationships reviewed by the OpenHaven data steward. They describe how projects connect, not how good they are.

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