Collaborative platform to build immersive roleplay worlds with AI characters
Agent wiki and visual workspace for Claude Code, Codex and other AI coding agents
Stage
Startup
Not given
Founded
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Based in
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Pricing model
Freemium
Freemium
Pricing
Free: $0/month with unlimited characters and messages using free AI models. Plus: $10/month including everything in Free, unlimited public and private worlds, $10 model credits monthly, more detailed personas, more slots, and priority support.
Free: Nimbalyst app and personal wiki. Wiki Teams: $20 per user per month or $200 per user per year (currently free during beta).
Key features
World editor with visual interface for characters, backstory, and locations
Characters know each other and develop memories
Auto-vector embedding for content retrieval in chat
Advanced prompt customization for system prompts and LLM parameters
GitHub-like collaboration with world forking and change proposals
WYSIWYG markdown editor with AI-assisted editing
Red/green inline diffs for AI changes approval
Visual editors for mockups, diagrams, and drawings
Parallel agent session management
File and session linking
Persistent searchable session history
Pull request review in Developer Mode
MCP server support
What makes it different
Prevents AI hallucinations through interconnected world lore and character context
Complete control over prompt engineering and AI behavior customization
Private roleplay data not used for AI model training
Agents write the wiki as they work, eliminating manual documentation
Open source and local-first: your data stays on your machine
Built by Evergage founders who scaled to $250M ARR
One unified workspace instead of multiple disconnected tools
OpenRP
Nimbalyst