Codex Localis — Your Campaign's Co-GM
A local-first AI assistant that reads your sourcebooks and thinks in your system.
CoLoci (Co-low-key) indexes your RPG PDFs — stat blocks, character creation, item tables — and gives you setting-informed, system-aware answers on demand. It handles the scaffolding. You bring the world to life.
What CoLoci Is — And Isn't
Being a great GM isn't about knowing every stat or building every NPC from scratch — it's about being present at the table and making the world breathe. CoLoci takes the grind off your plate so you can pour your energy where it actually matters.
How It Works
Point CoLoci at your sourcebooks. It reads character creation chapters, stat blocks, item tables, and bestiary entries — understanding your system's structure, not just its text.
Type your prompt the way you'd ask a fellow GM. "Build me a Shadowrun fixer with ties to the Yakuza." CoLoci searches your indexed library and generates a system-aware answer using the model you choose.
Tweak, export, or drop directly into your notes. Everything stays on your machine — no cloud, no subscription, no sending your campaign to someone else's server.
Truly Local. Genuinely Private.
CoLoci runs on Ollama — an open-source local model runner. You choose the model. You own the hardware. Nothing is ever sent to a remote server.
Deep PDF Understanding
Most tools treat a PDF like a wall of text. CoLoci understands the structure of RPG sourcebooks — where character generation lives, how stat blocks are formatted, what the item tables mean for your system.
Generation in Seconds
No more generic stat blocks. CoLoci generates NPCs, encounters, and items grounded in your indexed sourcebooks — abilities and power levels drawn from your books, with the right flavour for your setting.
System Knowledge
CoLoci has specialist knowledge of these systems — not just their text, but their structure, their math, and the way their sourcebooks are organised.
More systems coming soon — your sourcebooks, your call.
Who It's For
Whether you're cracking open a new mystery tonight or threading a three-year epic, CoLoci meets you where you are.
You've got a mystery to run Friday and no time to build a custom move, an antagonist, and three supporting NPCs from scratch. CoLoci generates a complete, playable mystery frame — locations, the monster's countdown, Bystander motivations — in minutes. You add the details that make it yours, and arrive at the table ready to be fully present.
Three years in, your world has history. CoLoci indexes your session notes alongside your sourcebooks so generated content fits the continuity you've already built. Need a new faction NPC who respects the politics you've established? It reads the room — because you taught it your world.
Pricing
No subscriptions. No cloud. Download the full app, use it for your first 50 generations on us — then buy a lifetime license when you're ready.
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Questions
Download CoLoci, index your books, and see what prep feels like when the scaffolding is handled — so you can spend your energy on the part only you can do.