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

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

• 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

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.

• 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

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.

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

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.

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)

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.

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

© 2020 Steven M Cohn. All rights reserved.