Know your code before you touch it.
Paste any GitHub repo. Get a deterministic map of risk, complexity, and structural debt — in under a minute. No LLM guesses, just 17 grounded signals across 7 languages.
What you'll find
Blast radius
Click any file or function. See what breaks if you change it — three hops deep across the call graph.
Repo health
Red / yellow / green verdict grounded in 17 deterministic signals — complexity, churn, coverage, dependencies. No AI hallucination.
Architecture canvas
Folder frames + file cards laid out as a packed map. Time-scrub to watch the codebase evolve commit-by-commit.
Untested hotspots
Most-complex production functions with zero test caller. Computed by walking the call graph from test files into production code.
Near-duplicates
Structural AST hashing finds 36 copies of one ARM rewrite pattern in golang/go src/cmd. Across 7 languages.
PR-bot · new
Install the GitHub App. Every PR gets one grounded review comment from the same signal layer. Zero LLM cost, deterministic-only.
Real findings
Near-duplicates found 36 copies of one ARM register-shift rewrite pattern across src/cmd/compile — canonical SSA-rewrite family.
_alter_field has cyclomatic complexity 91 — the schema migration's most complex single method. Two test callers, zero direct tests.
load_dotenv grew +4 cyclomatic complexity between 3.0.3 and 3.1.0 — no tests changed in the same module. Caught at PR time by our rules engine.
Type-aware call resolution resolved 8 ambiguous validate() call-sites to the right overload. Unresolved list is now exclusively stdlib + Spring.
Two surfaces, one signal layer
Map an entire repo
Paste a URL. Get an explorable canvas, blast radius, untested hotspots, near-duplicates, dependency health, and a red / yellow / green verdict grounded in 17 deterministic signals — all under one workspace.
Free account · public repos · sessions saved as JSON · works on monorepo subdirectories
Review every PR
Install the GitHub App on a public repo. On every PR, get one grounded review comment with the top verification signals from the diff — linked back to the workspace for the deep dive.
Private beta · zero LLM cost · find-or-update on every synchronize
See your codebase as a class diagram — automatically.
RepoBaron extracts classes, interfaces, and method relationships from your repo's AST and renders them as a navigable Mermaid diagram. No manual UML, no plugins, no setup — just paste a URL and explore.
- Filter unconnected classes, search by name, scope by folder
- Export Mermaid source — paste into README or mermaid.live
- JavaScript & TypeScript today, more languages rolling out
Roadmap
- May 2026Accounts + workspaceSign up with email or GitHub. Sessions tied to your account, accessible from any device. Connect GitHub from /account to link both sign-in methods.
- May 2026RepoBaron PR-botOne grounded review comment on every PR. Same signal layer as the workspace, zero LLM cost.
- May 2026Architecture diagramsClass diagrams auto-generated from your repo's AST. Across 7 languages, no manual UML, no setup.
- May 2026Near-duplicate detectionAST-hash structural matching. Caught 36 ARM-rewrite copies in golang/go src/cmd.
- NextEmail verificationVerify your email + recover forgotten passwords via Resend. GitHub OAuth currently works as the recovery path.
- SoonPre-PR self-reviewSame signals, on your local branch, before the diff goes public. "Check this before you push."
- SoonCross-PR trend analyticsComplexity, coverage, and hotspot trends across snapshots — see where your codebase is drifting.
- PlannedPrivate reposAnalyze private repos via per-account GitHub permissions. Auth layer is in place; permission model is the missing piece.