Beta Testing — Windows · Android · Web

The All-in-One
TTRPG Campaign Engine

Build worlds. Generate scenes. Manage your journal.
Run sessions — all from one app, offline-first, on any device.

Explore Modules Sneak Peek Explore Pricing
Windows Android Web iOS (coming)

Four Pillars

Everything a GM needs, unified

L.E.O. is built around four deep, integrated modules. Each works standalone — but together they form a complete campaign engine.

01

World Builder

From seed to civilization — procedurally generated, fully editable worlds.

  • Multiple terraforming algorithms — continent, fractal, pangea & more
  • Multi-layer visualization — heightmap, temperature, rainfall, biomes
  • 3D globe preview with real-time rotation
  • Network system — roads, trails, sea routes
  • Pin sessions, POIs and dungeons to your world timeline
  • Settlements, dungeons, passages & custom POI types
  • Auto-generated names, regions, states, religions & military campaigns
  • Relief icons to naturalize terrain
  • Zoomable atlas maps for fine-print regions
  • Export as .leo or high-res PNG with custom sizing
  • Custom style presets or full manual control
Offline Cross-platform Exportable
02

Scene Generator

Gold-standard procedural scenes — from dungeon to mansion, in seconds.

  • Towns, villages, houses, mansions, caves & dungeons
  • Integrated tile & object editor
  • Custom scene types with premium content support
  • Style presets or fully manual customization
  • Advanced export — PNG, UVTT, sharing links
  • Direct push to Foundry VTT as .uvtt with walls & lights pre-configured
  • Shareable scenes — send to players instantly
  • Seeded generation for reproducible layouts
Foundry VTT UVTT Export Shareable
03

Journal & Lore DB

Your entire campaign knowledge base — NPCs, items, events, all connected.

  • Full personal DB — NPCs, lore, legendary items & more
  • Session & encounter manager with historical logs
  • Event log tied to your world timeline
  • Session notes linked to active world & session
  • Mind map with Bézier canvas — infinite scroll, workspaces, images
  • Procedural map connections directly on the canvas
  • Sound pad — ambient tracks & SFX for atmosphere
  • PDF reader — load your campaign books in-app
  • Integrated bestiary with open D&D data & quick filtering
Offline DB Mind Map D&D Bestiary
04

VTT System

Mobile-first virtual tabletop. Switch from generated scene to live play instantly.

  • Upload any image or switch from generated scene in one tap
  • Auto-generated walls from scene data
  • Multi-token system with fog of war
  • Dynamic lighting — fully dependent on wall system
  • Chat & dice roll system integrated
  • Square, hex & isometric grid modes
  • Pathfinding token movement — 4 algorithm methods
  • Map-aware encounter system
  • Atmosphere sound system
  • Foundry VTT integration — push scenes on demand
Mobile-first Fog of War Live Play

Official Integration

Plays beautifully with Foundry VTT

L.E.O. is officially integrated with Foundry VTT. Export any procedurally generated scene directly as .uvtt — with walls, lighting, and metadata pre-configured. One tap from your phone or desktop, and your scene lands in Foundry ready to run. No re-drawing walls. No manual light placement. Just play.

✓ Universal Battlemap (.uvtt) export
✓ Auto wall alignment from scene data
✓ Pre-configured light sources
✓ High-res WebP compression
✓ Grid-locked scaling
✓ Push from phone or desktop, on demand

Built Different

Offline-first. Mobile-first. Battery-friendly.

No cloud dependency, no forced subscription, no GPU required. L.E.O. is engineered for real hardware and real sessions.

Offline First

All four modules work without internet. Your data lives on your device. No cloud, no lock-in, no data harvesting.

Battery-Friendly

Low-impact rendering techniques designed to not destroy battery life. Runs smoothly on mid-tier phones — no high-end GPU needed.

Mobile-First Design

Every tap counts. Built for phone and tablet with the same experience on desktop — not a mobile afterthought.

Google Drive Backup

One-tap DB snapshot to Google Drive. Switch between Windows, Android, and Web instantly — your campaign travels with you.

Private by Default

Your worlds, maps, and sessions are never uploaded unless you explicitly choose to share them. Your campaign is yours.

Algorithmically Sound

Smart seeded generation — reproducible, valid layouts every time. Zero junk results. Every map feels handcrafted.

Availability

Run it everywhere

Windows Desktop

Full-featured desktop app. Best for prep sessions and running VTT with a big screen.

Available in Beta

Android

Native mobile app, offline-first. Use it at the table as a GM companion or full VTT controller.

Available in Beta

Web App

Browser-based access with no install required. Ideal for players and GMs on any machine.

Available in Beta

iOS

Available unsigned for sideloading now. App Store release depends on community demand — let us know if you want it.

Unsigned / On Demand

Google Drive sync lets you snapshot your DB and restore on any platform — start a campaign on Android, continue on Windows, no friction.

Simple Pricing

Pay once. Play forever.

The full offline toolkit is a one-time unlock. Pay only for online services that actually cost us infrastructure.

Player

Join campaigns as a player

Free forever
  • Mobile companion app
  • Join campaigns & view scenes
  • Standalone scene access
Get Started Free
Most Popular

GM

Full offline campaign toolkit

€19 one-time

No subscription. No expiry. Yours forever.

  • Everything in Player
  • World Builder — full module
  • Scene Generator — all scene types
  • Scene Editor — map editor module
  • Journal & Lore DB — full module
  • Local VTT (offline, same device)
  • High-res local exports
  • Social sharing
  • Print-ready assets
  • Google Drive DB backup
  • 100% offline, fully private
Unlock GM — €19

GM + Live

Online play & advanced features

€6 /month

Requires GM unlock. Covers server & WebSocket infrastructure.

  • Everything in GM
  • Online VTT — remote play
  • Live campaign sync with players
  • WebSocket real-time updates
  • Higher-res exports & sharing
  • Layered Photoshop format
  • Foundry VTT cloud push
  • Device-to-device collaboration
  • Priority support
Add Live — €6/mo

💡 Why is online a subscription? The offline GM toolkit is yours forever for €19. The €6/month only covers real costs — WebSocket servers, file hosting, and bandwidth for live collaboration. No profit-extracting subscription lock-in. If you never play online, you never pay the subscription.

Why L.E.O.?

One app. Four modules. Zero plugins.

Feature L.E.O. GM L.E.O. Live Generic VTT Map app
Procedural world generation✓✓—Some
Procedural scene generation✓✓—Some
Journal / NPC database✓✓Basic—
Mind map + Infinite canvas✓✓——
Open5e compendium✓✓——
VTT (fog, tokens, lighting)Local only✓ Online✓—
Foundry VTT .uvtt export✓✓——
Hex / ISO / Square grid✓✓Varies—
Works fully offline✓Partial—Partial
Android & mobile native✓✓Desktop onlySome
Battery-optimized✓✓—Varies
PDF reader built-in✓✓——
Integrated bestiary (D&D OGL)✓✓Some—
Google Drive backup✓✓——
One-time unlock (no sub)€19+€6/mo online€40+ or subVaries