Function Fable
AI chat, coding assistant, and creative companion — everywhere you work. Multi-provider intelligence with 60+ agent tools across macOS, iOS, and Android.
Five Modes for Every Workflow
From passive exploration to fully autonomous operation, Function Fable adapts to how you work.
Explore
Discover and understand codebases. Read files, search patterns, and map architecture without changes.
Review
Analyze code quality, identify bugs, and suggest improvements with detailed reasoning.
Refactor
Restructure and improve code. Rename, extract, and reorganize with confidence.
Implement
Build new features with guided implementation. Write code with full project context.
Autonomous
Full agent mode. Function Fable researches, plans, codes, tests, and commits independently.
Multi-Provider AI Chat
Seamlessly switch between Claude, Gemini, Grok, and OpenAI within a single conversation. Function Fable tracks token usage, calculates costs in real-time, and persists conversations across sessions.
- Provider switching mid-conversation
- Token counting & daily cost tracking
- Conversation persistence & search
- Extended thinking / reasoning across all providers
- Streaming responses with live preview
Intelligent Coding Assistant
Function Fable brings powerful development tools to every platform. Write, refactor, and debug code with AI assistance powered by Riverbane AI — the same multi-provider engine behind Grizzly Brain, our macOS-native coding powerhouse.
- Code editor with syntax highlighting
- Named snippet management with token tracking
- 60+ development tools in agent mode
- Jira, Confluence & GitHub integration
- File system organizer with git integration
Beyond Code: Creative Intelligence
Function Fable is more than a coding tool. It brings AI-powered creativity to storytelling, image generation, and video creation.
Story Reader Mode
Interactive Fiction
Experience interactive fiction powered by AI. Custom system prompts generate branching narratives in real-time. Pairs with Stories Designer for a complete creative workflow.
Creative Generation
Multi-Modal AI
Generate images with GPT Image 1 and Gemini Flash/Pro. Create videos with Veo 3.1. Multi-modal capabilities bring your ideas to life.
Available Everywhere You Work
One app, three platforms. Built with Flutter and Material 3 Expressive theming for a native feel on every device.
macOS
Full desktop experience with agent mode, file system access, and native macOS integration. Complements Grizzly Brain as a lightweight multi-provider alternative.
iOS
AI chat and creative tools on the go. Full conversation sync, image generation, and story reader mode from your iPhone or iPad.
Android
The same powerful AI assistant on Android. Material 3 Expressive theming ensures a polished, native experience on every device.
Your AI Assistant, Everywhere
Function Fable brings multi-provider AI intelligence to every platform. Code, create, and collaborate with autonomous agent tools.