Lettertrace

Lettertrace is an open-source tool that tells you how often AI assistants like Claude, ChatGPT, and Gemini mention your company. It answers questions like: "Does Claude recommend my product?" and "What sentiment does ChatGPT have about my brand?" You give it a topic or brand name, and it runs the same queries across multiple AI models, then shows you a clear report with visibility, share of voice, and sentiment scores. The whole thing is free — you only pay for the API keys you bring.

How does it work? You add a topic your buyers care about (like "best CRM for startups"), and Lettertrace automatically turns it into dozens of natural-sounding prompts. It sends those prompts to the AI models you choose, using your own API keys. The results are compiled into a dashboard that tracks brand visibility, prominence, sentiment, and how often you appear compared to competitors. You can schedule runs daily or weekly, so you can watch trends over time. The tool is MIT-licensed, runs on your own Supabase, and stores no data on third-party servers. Standout features include multi-model support (Claude, GPT, Gemini, and Google AI Overviews), auto-generated prompt variations, and sentiment analysis that tells you if the AI speaks well of you.

This tool is made for brand managers, SEO teams, and anyone working in AI engine optimization (AEO) or generative engine optimization (GEO). If you're a startup trying to understand how AI chatbots perceive your product, or a marketing team tracking competitor mentions, Lettertrace gives you concrete data instead of guesswork. Developers will appreciate the self-hosted, open-source setup and the CLI option. Use cases include monitoring brand sentiment across AI platforms, benchmarking against competitors, and identifying which topics drive positive AI recommendations.