Lettertrace
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 launched on August 12, 2026 with 377 votes, #45 of 23,274 launches that month and more than 99% of that year's launches.
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.
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. Lettertrace writes the real prompts people put to assistants, dozens per topic. Claude, ChatGPT and Gemini answer. Each answer is read for mentions, position and sentiment. Every run is a datapoint. The line tells you whether it’s working. Every answer in your category, split between you and the brands you track. Watch your share grow, and see what moved it. Use your own Anthropic, OpenAI & Google keys. They’re encrypted at rest and never leave your infrastructure. Monitor Claude, ChatGPT, Gemini, and Google AI Overviews side by side.…from lettertrace.com
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