DiffGuardian

DiffGuardian is a desktop app that provides spoken and written walkthroughs of pull requests and codebases while highlighting code and rendering visual graphs.

DiffGuardian is a desktop application for macOS, Windows, and Linux that helps engineers and product managers review codebases and pull requests. Users can speak their questions or type to receive spoken or written explanations, while the app automatically scrolls to and highlights the relevant code. The tool indexes repositories into a code knowledge graph and constructs live visual call graphs and dependency blast-radius diagrams from diffs. Code stays local, allowing users to bring their own API keys for Anthropic, OpenAI, Gemini, and OpenRouter, or run local models via Ollama, LM Studio, llama.cpp, and vLLM. Spoken audio uses OpenAI, ElevenLabs, or system voices.

DiffGuardian at a glance

Best for: Software engineer, Product manager
Runs on: macOS, Windows, Linux
Pricing: Free basic tier forever; paid Pro, Team (minimum 3 seats), and Enterprise tiers available without specific price numbers listed.
Released: October 2026
Category: AI coding tool
Website: diffguardian.ai

Key features

Spoken code walkthroughs triggered by holding the Space key
Live code highlighting that auto-scrolls into view as explanations play
Repository indexing into code knowledge graphs and live visual call graphs
Trace It written guided tours breaking PRs down feature by feature
Diff blast-radius dependency graph generation prior to merging
Support for fully local models via Ollama, LM Studio, llama.cpp, and vLLM
Bring-your-own-key support for Anthropic, OpenAI, Gemini, and OpenRouter
Integration with MCP servers

Use it for

Reviewing large pull requests by listening to an audio summary of feature changes
Asking questions out loud to understand architecture and call flows across an entire repository
Assessing the blast radius and module dependencies of incoming changes before merging
Reading feature-by-feature written walkthroughs of AI-generated pull requests

Alternatives to DiffGuardian

What The Diff — It automatically writes pull request descriptions and summarizes code changes.
Diffblue — Generates verified, production-ready unit tests across entire repositories.
logPhase — Translates complex pull requests into visual user journeys for fast review.
jevgrep — Reduces coding agent costs by providing targeted, relevant repository context.
Diff Tour — Generates guided reviews of git branches with read-only LLM permissions.
Diffity — Review local or agent code changes like a pull request and let agents fix them.
GitGuardian — Detects leaked secrets and insecure machine identities across your entire stack.
Diffle — Review git diffs in the browser and send comments to GitHub or agents.
guides.show — Explains code diffs in order of importance through portable, encrypted links
Freebuff — Access multiple coding AI models for free without subscriptions.
New Relic — Unified visibility across applications, infrastructure, and AI models.
Google Antigravity — It allows local management and parallel execution of autonomous coding agents.

All DiffGuardian alternatives