SessionZero is a free and open-source TTRPG "companion" application for managing characters, templates, data, and game sessions. It allows you to utilize any TTRPG system by being completely data-driven with user-generated content.
Features
Offline-First, No Strings Attached
By default, SessionZero works completely offline. Your data is stored locally on your machine. No account required. No phoning home. You have total ownership over your data.
Build Your Own Universe
You're the architect. Create templates for character sheets, define custom stats, and build your own collections (Datasets) of items, spells, monsters, or anything else your game needs. All data is stored in a human-readable format (SZF) that you can easily export, share, and back up.
Run Your Game, Your Way
Use SessionZero for your private, offline session notes, or host a live online game for your friends. As a Game Master, you can manage NPCs, track turns, and make real-time updates to character sheets. Players can join with their own characters and keep private session journals.
Open Source and Transparent
SessionZero is open-source software. We believe in the right to see what's going on behind the scenes and contribute to the project. No AI chatbots, no ads, no bloat. We promise.
The SessionZeroDB
SessionZero includes access to the SessionZeroDB, a free online repository of user-created templates and datasets. When online, the application can automatically find and download required content for you.
Online Play & Pricing
The core SessionZero application is, and always will be, free. For online play, you have two options:
Self-Hosted Server (Free)
For those who like to be in control, you can host our open-source server backend yourself. This allows you to create and join online sessions for free with your friends. You can connect to any unofficial server and never need to connect to the official servers or pay a fee.
Official SessionZero Servers (Subscription)
For convenience, you can connect to the official SessionZero servers. Hosting and joining sessions on the official servers requires a simple monthly subscription that helps us maintain the service and continue development.
Who Is This For?
- Players who want total control over their character sheets and game data
- Game Masters who want to run any system whether it's a popular RPG, niche indie game, or their own homebrew content
- Anyone who's tired of apps that feel bloated, hard to learn, restrictive, or designed to constantly sell you something
The Bottom Line
SessionZero is about freedom, flexibility, and respecting your game. It's not here to sell you a bunch of digital add-ons or lock your data in a vault. It's a tool built to help you play.
Ready to Get Started?
No account required. No installation needed. Just start playing.