PND

[PND] - Pro Notes Database

PND is the cross-platform evolution of Protes. Built on .NET 8.0 and Avalonia UI, it brings the same familiar notepad-style experience to Windows, Linux, and macOS — with a modern architecture, full theme customization, and rock-solid AES-256 encryption.

Your notes live in a clean, local database file (.pnd, .db, or .prote)
The Note Editor looks and feels like classic Notepad — clean and distraction-free
Connect to external MySQL / MariaDB databases for multi-device sync
Light and Dark modes with full per-color customization
Double-click a .pnd file to open it instantly

✨ Features

🎨 Custom Themes

Light/Dark modes with full color customization. Every UI element can be tuned to your personal preference.

🔒 Lock & Encryption

Password-protect your databases and encrypt individual notes with AES-256. Encrypted entries appear as [Encrypted Data].

📁 Local First

Stores data locally on your device. Your notes never leave your machine unless you choose to connect externally.

🌐 External Support

Connect to MySQL or MariaDB databases for syncing across devices. Save and switch between multiple connection profiles.

🖥️ Cross-Platform

Runs natively on Windows, Linux, and macOS — powered by Avalonia UI and .NET 8.0.

📝 Simple Editor

Clean, notepad-style note editing experience with word wrap, zoom support, and a distraction-free interface.

🔒 Privacy & Control — Password & Encryption

100% local by default. — your notes never leave your machine unless you choose to connect externally.

Optional MySQL/MariaDB support — sync across devices securely when needed
🛡️ Password/Lock System: Your password is hashed and cannot be recovered. For maximum safety, use Encryption alongside a strong password.
🔑 AES-256 Encryption: Encrypt individual notes (title, tags, and content) with a key derived from your password + salt. Encrypted notes appear as [Encrypted Data] in the UI.
🔐 Transparent security warnings: Clear alerts about the risks of password loss and data recovery limitations.
🧾 Data trail: Encryption state is always visible — never guess whether your data is secure.

🔑 AES-256 Encryption Details

Each note's title, tags, and content are encrypted individually using AES-256 in CBC mode with a unique initialization vector (IV). The encryption key is derived from your password using PBKDF2-HMAC-SHA256 with 100,000+ iterations and a per-database random salt stored in the DB.

No part of your password is ever saved. If you forget it, encrypted data cannot be recovered — by design. USE AT YOUR OWN RISK. Non-sensitive metadata (e.g., timestamps, IDs) remains unencrypted for usability.

🚀 Getting Started

Launch PND
Create or open a database file (.pnd, .db, or .prote)
Start taking notes!

⚙️ Requirements

.NET 8.0 Runtime or SDK
Avalonia UI compatible platform (Windows, Linux, macOS)

🛠️ Technology Stack

Component	Technology
Framework	.NET 8.0
UI Framework	Avalonia UI 11.x
MVVM Library	CommunityToolkit.Mvvm
Local Database	SQLite (Microsoft.Data.Sqlite)
External Database	MySQL / MariaDB (MySqlConnector)
Encryption	AES-256 via System.Security.Cryptography
Dialogs	MessageBox.Avalonia
Serialization	System.Text.Json
Cross-Platform	Windows, Linux, macOS

Architecture Info — Designed in Visual Studio

.NET 8.0 + C# + Avalonia UI — clean, cross-platform, and maintainable
MVVM architecture — powered by CommunityToolkit.Mvvm for a clean separation of concerns
Repository pattern — abstracted data access supports both SQLite and MySQL with zero code duplication
Single-instance enforcement — opening a .pnd file activates the existing app window and prompts to switch databases
Live theme engine — full color customization applied instantly with no restart required

The Next Generation of Pro Notes