OneMore – a OneNote Add-in

OneMore is an add-in for OneNote with simple and powerful features that make OneNote a better OneNote.

• Download the latest release
• Read the installation instructions
• See the OneMore Guide for complete feature documentation and Command descriptions

Everything OneNote should have shipped with

A few hundred small conveniences, all built into one add-in. Free, open source, and installs in under a minute.

Key Features

• Use the Command Palette and Quick Palette - 200+ commands and styles without leaving the keyboard
• Custom Text styles and Table themes provide consistent formatting across all notebooks
• Aut-generate Table of Contents for any page, section, or notebook — kept in sync as you edit
• Paste Markdown straight into OneNote, or drop in syntax-highlighted code boxes for snippets
• Pin your most-used pages as Favorites and tag notes with inline #hashtags to find them instantly
• Crop, rotate, and Adjust images without leaving OneNote — plus render Mermaid and PlantUML diagrams
• Save any block of content as a reusable Snippet, then drop it into any page whenever you need it
• No subscription, no telemetry opt-in required, no catch. Built in the open on GitHub since 2018

Popular with Users

Top commands from real usage across the OneMore community:

• Apply Style — 23,902 uses/month
• Paste Text — 9,055 uses/month
• Insert TOC — 8,543 uses/month
• Join Paragraph — 7,670 uses/month
• Insert Code Box — 5,197 uses/month
• Colorize — 5,155 uses/month

See the full OneMore User Guide for complete feature documentation and command descriptions.

Get Started

• Installation Guide — Step-by-step setup instructions
• Feature Documentation — Full user guide and command reference
• Command Line Interface — Automate 40+ commands from the command line

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For Developers

OneMore is a comprehensive OneNote add-in built with C# and the OneNote Object Model. The project is organized into multiple components to support core functionality, testing, and deployment.

Repository Structure

Core Components

• OneMore/ — Primary add-in source code and ribbon UI
• OneMoreCalendar/ — Specialized calendar application for tracking page creation/modification
• OneMoreCli/ — Command-line interface runner for automating OneMore commands
• OneMoreTray/ — System tray application component
• OneMoreProtocolHandler/ — URI protocol handler for deep linking

Setup & Installation

• OneMoreSetup/ — Installation package and setup wizard
• OneMoreSetupActions/ — Custom setup actions and configuration
• OneMoreBundle/ — Bundle packaging utilities

Testing & Quality

• OneMoreTests/ — Unit and integration test suite

Extensibility

• Plugins/ — Plugin architecture for extending OneMore functionality
• Templates/ — Reusable content templates
• Themes/ — UI theme definitions and customization

Documentation & Resources

• docs/ — User documentation, guides, and website source
• Reference/ — Reference materials and specifications
• packers/ — Packaging and distribution utilities

Build & Development

The project uses a Visual Studio solution structure (OneMore.sln) with PowerShell build scripts for compilation and deployment.

Key Technologies

• Language: C# (.NET Framework)
• Platform: Windows Desktop with OneNote Desktop integration
• UI Framework: OneNote Ribbon UI and WinForms/WPF components
• Testing: Unit tests in OneMoreTests

Build Requirements

• Visual Studio 2026 Community Edition
• .NET Framework 4.8.1
• OneNote Desktop Edition

See the Developers Guide for detailed setup instructions and contribution guidelines.

Solution Architecture

The modular architecture allows OneMore to:

• Maintain a stable core add-in (OneMore/) while supporting specialized features
• Provide automation through the CLI runner without bloating the main add-in
• Enable plugin-based extensibility for advanced users
• Separate concerns between UI (Calendar, Tray), backend (Core), and tooling (CLI)

License & Privacy

OneMore is released under the Mozilla Public License 2.0. See the Privacy Policy for information about how we handle user data — we don't collect personal information and remain committed to your privacy.

Contributing

Contributions are welcome! Please see the Developers Guide for information on setting up a development environment and submitting pull requests.

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© 2020 Steven M Cohn. All rights reserved.