Lettertrace
Show HN: Self-hosted monitoring for AI recommendations (MIT License)
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What is Lettertrace?
Lettertrace is a free, open-source tool that monitors how often AI models (Claude, ChatGPT, Gemini) mention your company in their responses. It provides brand visibility metrics, share of voice benchmarking, sentiment analysis, and competitive insights—with a bring-your-own-key model and self-hosting option for complete data control.
Lettertrace pricing
Pricing model: Freemium
Free (open source, self-hosted)
Lettertrace pros
- Completely free and open source (MIT licensed) with no hidden fees or usage markup
- Bring-your-own-key architecture: API keys are encrypted at rest and never leave your infrastructure
- Multi-model monitoring (Claude, ChatGPT, Gemini) with automatic prompt variation generation from single topics
- Comprehensive metrics: brand visibility, share of voice, sentiment analysis, competitor benchmarking, and trend tracking over time
Lettertrace cons
- Requires technical setup and self-hosting for full data control (though setup is described as quick)
- Depends on valid API keys from OpenAI, Google, and Anthropic—users must manage these separately
- Limited to AI model mentions only; does not monitor traditional search engines, social media, or web mentions
Frequently asked questions about Lettertrace
How much does Lettertrace cost?
Lettertrace is completely free. It's open source (MIT licensed) and uses bring-your-own-key architecture, so there are no subscription fees or usage markups.
Which AI models can be monitored?
Claude, ChatGPT, and Gemini are currently supported, with the ability to add more models as needed.
Is my data private?
Yes. API keys are encrypted at rest and never leave your infrastructure. If self-hosted, your data lives in your own Supabase instance with no vendor lock-in.