Owl20

Owl20 is a browser extension that bridges Beyond20 dice roll data to Owlbear Rodeo iframes. It connects D&D Beyond character sheets to Owlbear Rodeo VTT by capturing roll data from the Beyond20 extension and sending it to the Owl20 Owlbear Extension. This free tool enables seamless integration between D&D Beyond and Owlbear Rodeo, allowing players to roll dice on D&D Beyond and have the results automatically appear in their virtual tabletop sessions. Perfect for D&D 5e games, D&D 5.5e campaigns, and any tabletop RPG using Owlbear Rodeo as their VTT platform.

Install Owl20 from your browser's extension store: Microsoft Edge (available now), Google Chrome (available now), or Mozilla Firefox (available now). You must also have the Beyond20 browser extension installed and configured first. The installation process is simple - just search for "Owl20" in your browser's extension marketplace, click install, and follow the setup instructions. This extension works with D&D Beyond integration and requires Beyond20 to function properly.

Open Beyond20 settings, navigate to 'More Options' > 'Advanced Options', find 'List of custom domains to load Beyond20', and add 'https://www.owlbear.rodeo/*' to the list. Save your settings. This configuration allows Beyond20 to work with Owlbear Rodeo domains, enabling the dice roll integration. If you're having trouble finding the settings, look for "Advanced Options" or "Custom Domains" in the Beyond20 extension popup. This step is crucial for D&D Beyond dice rolls to appear in your Owlbear Rodeo VTT sessions.

Follow the instructions at https://extensions.owlbear.rodeo/guide for adding a custom extension. Use the installation link: https://owl20.FriendlyMimic.com/manifest.json. Only the DM needs to install and enable the OBR extension.

Open your Owlbear Rodeo room as the DM, click the 'Extensions' button in the toolbar, find 'Owl20' in your installed extensions, and toggle it ON for your room. The extension must be enabled in each Owlbear Rodeo room.

Check that Owl20 browser extension is installed and enabled, verify 'https://www.owlbear.rodeo/*' is in Beyond20's custom domains list, ensure the DM has Owl20 Owlbear extension enabled in the room, reload both pages, try opening Owlbear in a new tab, and check browser DevTools (F12) for 'Owl20:' messages. Common issues include: Beyond20 not configured for Owlbear domains, OBR extension not enabled by DM, browser permissions blocked, or network connectivity problems. Try refreshing both D&D Beyond and Owlbear Rodeo tabs, and ensure you're using a supported browser (Chrome, Edge, or Firefox).

Owl20 supports Chrome (Manifest V3), Edge (Chromium-based), Firefox (WebExtensions API), Opera (Chromium-based - install from Chrome Web Store), and other Chromium-based browsers with Manifest V3 support.

Yes. Install from the Chrome Web Store.

Yes. Install from the Edge Add-ons store.

Yes. Install from Firefox Add-ons.

Yes. Since Opera is based on Chromium, you can install Owl20 from the Chrome Web Store.

Yes, Beyond20 is required for Owl20 to work. You must have the Beyond20 browser extension installed and configured first. Owl20 bridges the data from Beyond20 to Owlbear Rodeo.

Players need: Beyond20 browser extension + Owl20 browser extension. DM needs: Beyond20 browser extension + Owl20 browser extension + Owl20 OBR extension (enabled in each room). Only the DM needs the OBR extension.

Player makes a roll in D&D Beyond → Beyond20 processes the roll and sends it to custom domains → Owl20 browser extension receives the Beyond20_Roll event and sends to OBR extension → Owl20 Owlbear Rodeo extension receives the data and displays it to all room participants. The technical flow uses JavaScript event listeners, JSON data transmission, and iframe communication protocols. This creates a seamless bridge between D&D Beyond's dice rolling system and Owlbear Rodeo's virtual tabletop interface, enabling real-time dice roll synchronization for online D&D games.

To connect D&D Beyond to Owlbear Rodeo, you need both Beyond20 and Owl20 extensions. First install Beyond20 and configure it for Owlbear Rodeo domains, then install Owl20 browser extension, and finally have your DM install the Owl20 OBR extension. This creates a complete bridge between D&D Beyond character sheets and your Owlbear Rodeo virtual tabletop, enabling automatic dice roll integration for D&D 5e and 5.5e games.

Yes, Owl20 works with both D&D 5e and D&D 5.5e (2024 edition). Since Owl20 bridges dice roll data from D&D Beyond to Owlbear Rodeo, it works with any D&D edition that D&D Beyond supports. The extension captures roll data regardless of the specific D&D ruleset being used, making it compatible with traditional D&D 5e games, the new D&D 5.5e rules, and any future D&D Beyond updates.

Beyond20 is the original extension that connects D&D Beyond to various virtual tabletops like Roll20, Foundry VTT, and others. Owl20 is a specialized extension that specifically bridges Beyond20's data to Owlbear Rodeo. Think of Beyond20 as the foundation - it captures dice rolls from D&D Beyond. Owl20 builds on top of Beyond20 to extend that functionality to Owlbear Rodeo VTT. You need both extensions for the complete D&D Beyond to Owlbear Rodeo integration.

Ensure you're using a supported browser (Chrome, Edge, or Firefox), try disabling and re-enabling the extension, check for browser updates, and review extension permissions.

Yes, Owl20 is completely free. It's available at no cost from the browser extension stores.

Visit the GitHub Issues page at https://github.com/mvoncken/owl20-owlbear/issues for help or to report bugs. You can also join the Starry Shores D&D Community Discord servers for support.

Owl20 focuses purely on data transmission - it listens for Beyond20 events and passes the raw JSON roll data to iframes without any visual display. It uses CustomEvent for same-origin iframe communication and postMessage for cross-origin iframe communication.

Owl20 has minimal permissions - only requires scripting permission and Owlbear host access. It doesn't collect personal data or require extensive permissions.