Open alpha · any GM can apply
Castle VTT is a desktop app for the GM. Click “Go online,” send a link, and your players join free in any browser. Built for Pathfinder 2e Remaster and D&D 5e, with fog of war, dynamic lighting and keyboard-first combat.
How it works
Fill in the short form below and confirm your email. Your alpha key arrives in your inbox.
One desktop app bundles the server. No Docker. Activation happens once, and nothing phones home during play.
Click “Go online” and send the invite link. Players open it in a browser and sign in on your server.
What’s in the box
Dynamic lighting with walls, windows and doors, including locked and secret ones. Every token sees with its own senses, such as darkvision and tremorsense. Fog of war is tracked per player and remembers what the party has explored.
Pathfinder 2e Remaster and D&D 5e in the same app. You get the three-action economy, multiple attack penalty, degrees of success, and conditions that actually modify rolls. On the 5e side: true multiclassing, Pact Magic, concentration and hit dice. Dice are rolled on the server.
Peer-to-peer voice and opt-in video run inside the app, with built-in voice changers for your NPCs.
Keyboard-first combat
Select a token, press a number to pick an attack, Tab to the target, Space to confirm. Every shortcut can be rebound under Help → Customize, and conflicts are flagged.
Combat VFX
Procedural combat VFX just landed on the alpha build: crescent melee slashes, ranged strikes as line-beam strokes, fire burst, cone, line, and heal pulse. The clip runs through all eight.
We plan to improve readability (especially melee on lit maps) and add more attack and spell effect variants over time.
And the rest
Guided creation for PF2e and 5e, built from your compendium, with levels 1–20 tracked.
Rolls come straight from the sheet. Spell slots, pact magic, hit dice and concentration track themselves.
Players place their own AoE templates, the ruler counts difficult terrain, and reaction prompts pop up when they trigger.
Import from Foundry, Roll20 and Universal VTT files with a review step. Grids are detected when you upload a map.
Optional AI helpers can run fully on your own machine (for example rules Q&A through Ollama), or stay switched off. An optional AI game master, on request, is coming.
The alpha
What works: lighting, rules math and voice, in real weekly games. We run our own tables on it.
What’s rough: it’s an alpha, so you’ll hit bugs, sometimes mid-session. Fixes arrive as signed updates that the app installs itself.
What we ask: run real sessions and tell us what broke, what dragged and what delighted.
Get your key
Two required fields. Confirm your email and your alpha key is on its way.
No spam, no list. We only email you about your alpha key.
Nothing for alpha key holders: your key comes with lifetime access, and you’ll never be charged. After the alpha, new customers pay the launch price.
Yes. Any GM can apply with the form above. Confirm your email and your key arrives in your inbox.
No, and they never pay. Only the GM runs the desktop app. Players open an invite link in any browser and set up a login on your server. There’s no account with us, no seat limit and no per-player cost.
No. Click “Go online” and you get a shareable link. The app handles the tunnel for you.
Windows, macOS (Apple Silicon) and Linux, and one key covers all three. The macOS build isn’t notarized yet, so the first time you launch it, right-click the app and choose Open.
On your machine. Maps, tokens, journals and campaigns are files you can back up yourself.
Pathfinder 2e (Remaster), D&D 5e, Old-School Essentials, and a generic mode for everything else.
It’s planned, not promised. Every build already updates itself.
