Lettertrace: Open-Source AI Visibility Tracking for Free

Lettertrace is a developer-first, open-source tool designed to measure how often major AI models mention your company. Unlike proprietary solutions, Lettertrace is free end-to-end, allowing users to self-host the application in minutes while maintaining full control over their data and API keys. It helps businesses understand their presence in AI-generated content by tracking visibility, sentiment, and competitor comparisons across platforms like Claude, ChatGPT, and Gemini.

Benefits

Lettertrace offers several key advantages for businesses looking to optimize their visibility in AI answer engines. First, it is completely free to use, with no hidden fees or usage markups. Second, it is open-source and built on an MIT license, giving users the freedom to inspect, fork, and extend the code as needed. Third, it supports self-hosting, which ensures that sensitive data like API keys never leave the user's infrastructure. The tool also automates the process of generating questions people ask AI assistants, saving time on manual prompt engineering. Finally, it provides clear metrics such as brand visibility, share of voice, prominence, and sentiment analysis to help teams make data-driven decisions.

Use Cases

Lettertrace is ideal for marketing teams, SEO specialists, and AEO (Answer Engine Optimization) professionals who want to track how their brand appears in AI-generated responses. For example, a startup selling CRM software can use Lettertrace to monitor how often buyers ask about "best CRM for startups" and see if their brand is mentioned in AI answers. Agencies can track mentions of "email tools for agencies" to gauge their market presence. The tool also allows businesses to benchmark their performance against competitors by comparing share of voice and frequency of mentions. Scheduled monitoring lets users run daily or weekly checks to visualize trends over time and adjust their strategies accordingly.

Pricing

Lettertrace is completely free to use. There are no subscription fees, hidden costs, or usage markups. Users only need to provide their own API keys for services like Anthropic, OpenAI, and Google, which are encrypted and stored securely on their own infrastructure.

Vibes

As an open-source tool, Lettertrace has gained attention from developers and tech-savvy businesses who value transparency and data privacy. Users appreciate its ability to provide actionable insights without the cost of proprietary solutions. While there are no formal reviews or testimonials in the provided information, the tool's design and features suggest it is well-received by those seeking a cost-effective and flexible way to track AI visibility.

Additional Information

Lettertrace is built on an MIT license, which allows users to freely use, modify, and distribute the software. It is designed for self-hosting, with data stored in the user's own Supabase instance. This approach ensures data privacy and avoids vendor lock-in. The platform supports multiple AI models, including Claude, ChatGPT, Gemini, and Google AI Overviews, and is designed to adapt as new answer engines emerge. Setting up Lettertrace is straightforward, requiring only a few terminal commands to clone the repository, install dependencies, and start the development server.