Forkpath

Overview

Change one moment in history and watch the consequences branch out. An AI writer maps what happens next, event by event, across parallel storylines, and puts a likelihood on every fork.

Alternate history is usually told as one story, but real history is a tree of things that almost happened. Forkpath keeps the whole tree, runs a realism check before every event so outcomes are not tidy by default, and keeps your timelines on your machine.

Highlights

• Branching alternatives with likelihoods, path odds and a Most likely view
• Parallel streams for regions or programs, with influence links and merges
• Realism check on incentives, capabilities and base rates, plus an on-demand plausibility review
• Edit, regenerate or branch any event; later events are marked stale
• Runs on a Claude Code session or any Anthropic or OpenAI-compatible API, including local models
• Cost tracking, prompt caching and thousand-node timelines kept smooth by a layout worker