Codebase Time Machine - Know Why Not Just What

Git tells you what changed. We tell you why. Every codebase has a memory problem. Senior engineers leave, and their context leaves with them. PR descriptions say "fix." Slack threads vanish. New hires lose two to four weeks asking, "Why is this like this?" before they ship their first meaningful change. Codebase Time Machine reads a repository's entire Git history with IBM Bob (watsonx.ai Granite) and turns it into an interactive, queryable brain. Paste any GitHub URL, wait about a minute, and you get five tools sharing one indexed history: • Why Engine — a RAG chat that answers natural-language questions with citations linking directly back to the commits, PRs, and ADRs it learned from. • Time Travel — scrub through any file's evolution with AI-generated summaries at every significant commit, including risk scoring and authorship attribution. • Auto-Generated ADRs — Architectural Decision Records extracted from commit patterns, with context, decision, and consequences written by Bob. • Ghost Author — chat with AI-synthesized personas of contributors who left, built from their commit history, code style, and domain expertise. • Knowledge Graph — an interactive D3.js force-directed visualization of files, authors, commits, and decisions, showing how they connect. The product was pair-programmed end-to-end with IBM Bob: every architectural call, every Supabase migration, every shader is checked in under bob_sessions/. We didn't just use AI, we built with it. Free forever for public repos. No credit card required. ~60 seconds to your first answer.