Lettertrace
Track your AI visibility for free (using your own API keys!)
In plain words
Lettertrace is an open-source monitoring tool that tracks how often Claude, ChatGPT, and Gemini mention a company in their responses. Users supply their own API keys to monitor specific topics and search queries, tracking visibility, sentiment, and trends over time. The tool generates realistic questions that buyers ask AI assistants and benchmarks results against competitors to measure share of voice. It is free, developer-focused, and designed for companies seeking to understand their presence in AI assistant outputs.
written from the facts on this page · September 2026
From the sources
Lettertrace measures how often Claude, ChatGPT, and Gemini mention your company. But there's a catch: it's free, developer-first, bring-your-own-key, and open source.
Open-source, bring-your-own-key monitoring for how your brand shows up in AI assistant answers. Track topics, generate prompt variations, watch trends, and benchmark competitors.
Lettertrace measures how often Claude, ChatGPT, and Gemini mention your company. But there's a catch: it's free end-to-end, developer-first, and open source. Add the subjects your buyers ask about, “best CRM for startups”, “email tools for agencies”. Lettertrace writes the real questions people put to AI assistants, so you monitor how they’re actually answered. Every run is a datapoint. Watch visibility, prominence, and sentiment move week over week. Ingest rival brands and see your share of voice, who the models recommend, and how often. Lettertrace turns raw AI answers into the metrics AEO/GEO teams track: visibility, share of voice, prominence, and sentiment, per topic, per model, over…from lettertrace.com
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