Infinite dark-fantasy adventures, narrated by your private AI
Play entirely in your browser. Works offline. Your data never leaves your device. Every run is procedurally seeded, fully reactive, and built for permadeath.
Paid-only. Start with a 7-day free trial. Starter $5/mo · Pro $15/mo.
I'll use my last health potion, then swing at the shadow.
The vial shatters against your lips. Warmth floods your veins as you step forward, blade catching the flickering torchlight. The shadow hisses, recoiling from the sudden flare of vitality. Your strike finds its mark—gold clinks softly as it dissolves into ash.
Your private AI Dungeon Master
An infinite dark-fantasy crawl that runs entirely on your device. No servers, no uploads, just pure immersion.
100% On-Device AI
The storyteller runs locally in your browser. Your data never leaves your device, and your campaign stays completely private.
Infinite Procedural Branches
Every run seeds a fresh origin, curse, and goal. The dungeon never repeats, and your choices permanently shape the path ahead.
Vivid Second-Person Prose
Step into atmospheric storytelling that reacts to your vitality, gold, depth, and inventory. The world remembers everything.
Free-Text Action Box
Go beyond three choices. Type literally anything — the AI understands, adapts, and weaves your wild ideas into the lore.
Deep World Memory
Past actions echo forward. Saved allies, cursed artifacts, and broken doors change future rooms. Permadeath makes every decision count.
Play Anywhere, Offline
Download the model once, then dive in. Zero cloud dependency, zero tracking, just your private campaign ready when you are.
Three steps
From the surface to the deepest dark.
Descend
Choose your origin, accept your curse, and step into the branching depths.
Decide
Read the prose, pick a path, or type your own move. The AI DM reacts instantly.
Endure
Survive the ever-changing dungeon, collect lore, and face permadeath. Then begin again.
Simple pricing
Start your 7-day free trial. No commitment, full access to your private AI DM.
For casual explorers
- 7-day free trial included
- Private on-device AI DM
- Generous run cap
- Core world memory
For dedicated delvers
- 7-day free trial included
- Larger, smarter AI storyteller
- Unlimited runs
- Deeper world memory & lore tracking
- Advanced free-text parsing
Frequently asked
Does my data ever leave my device?
Never. Grimhollow runs 100% on-device. Your private AI Dungeon Master processes every choice, tracks your inventory, and stores world memory locally. Zero servers, zero uploads, full offline play. Your data never leaves your device.
Is there a free trial?
Yes. Every plan includes a 7-day free trial so you can test the full experience risk-free. After that, Grimhollow is paid-only: Starter at $5/mo or Pro at $15/mo for unlimited runs and deeper AI memory.
How does the AI Dungeon Master work?
It narrates your dark-fantasy crawl in vivid second-person prose, adapts to your choices, and remembers consequences across runs. Pick from three options or type anything. Permadeath and procedural seeds guarantee infinite replayability.
Do I need to install anything?
Just a modern browser. Download the lightweight model once, then play anywhere offline. No cloud AI, no remote servers, and your data never leaves your device.
Your private AI Dungeon Master awaits.
Start your 7-day free trial. Play offline, keep your data local, and dive into infinite dark-fantasy runs.
Start free trial