Self-hosted · open infrastructure

Your Obsidian vault, everywhere — and yours alone.

SyncAgain is an Obsidian plugin that keeps every note in sync across all your devices in real time. End-to-end encrypted, conflict-aware, and synced through a server you control.

Create your account See how it works

Open source · End-to-end encrypted · Works on desktop & mobile Obsidian

My Vault — Obsidian

Vault

📄 Daily Note

📄 Project Ideas

📁 Research

📄 Reading List

Synced

💻 Desktop

📱 iPhone

💻 Laptop

Project Ideas

🔒 end-to-end encrypted · synced just now

⚡ Pushed from iPhone → 3 devices updated

Why SyncAgain

Everything a serious note-taker needs

Built for people who treat their vault as a second brain — and refuse to hand it to someone else's cloud.

Zero-trust encryption

Flip on optional AES-256-GCM and the plugin encrypts every note on your device before it leaves. Your passphrase never goes to the server — it stores only ciphertext it can't read.

End-to-end

Real-time sync

A persistent connection pushes changes the instant another device edits a file — no polling, no waiting. Edit on your phone and watch it land on your laptop seconds later.

Live push

Volume awareness

MD5 diffing means only the bytes that actually changed get transferred — never the whole vault. Light on bandwidth, light on your data plan, fast even on huge vaults.

Bandwidth-light

Conflict-aware writes

Coordinated locks serialize concurrent edits so two devices never clobber each other mid-upload. When a new device joins, a first-sync resolver walks you through any divergence cleanly.

Safe writes

Multi-vault & multi-device

One account, any number of independent vaults, synced to unlimited desktop and mobile devices. Each vault stays fully isolated, with its own encryption setting.

Unlimited

Offline-first

Keep writing with no connection — the plugin queues every change locally, then reconnects automatically and syncs the moment you're back online. Nothing is ever lost.

Auto-reconnect

Zero-trust architecture

The server holds your notes. It never holds your secrets.

With end-to-end encryption enabled, the plugin derives your vault key on-device from your passphrase and never transmits it. Every file is sealed with AES-256-GCM and authenticated before upload. To the server, your second brain is just indistinguishable noise.

✓ Keys derived locally — your passphrase never leaves your device
✓ Per-file integrity checks, so tampering is detectable
✓ Toggle encryption on or off with a safe, guided re-sync
✓ CAPTCHA + OTP protected recovery — no plaintext password ever stored

PLAINTEXT note on device

↓ AES-256-GCM + HMAC

CIPHERTEXT → uploaded

↓ synced to your server

CIPHERTEXT 🔒 opaque to server

↓ pulled & decrypted on-device

PLAINTEXT on your other devices

Up and running in minutes

How it works

Install the plugin, point it at your server, and your vault syncs itself from then on.

Install the plugin

Add SyncAgain to Obsidian, enable it, and enter your sync server URL in the plugin settings. Works the same on desktop and mobile.

Sign in & secure it

Create your account from the plugin, then optionally turn on end-to-end encryption with a passphrase only you know.

Just write

Edit anywhere. Changes push in real time, conflicts are handled for you, and every device stays effortlessly in sync.