Lettertrace

Track how ChatGPT, Claude, and Gemini talk about your company, using your own API keys

Check the priceWe couldn't find a free tier on lettertrace.com on our last check. Confirm the current pricing on the tool's own site before relying on any free tier listed below.

What it is

Lettertrace is an open-source, MIT-licensed tool that tracks how a company actually shows up in AI assistant answers, monitoring Claude, ChatGPT, Gemini, and Google AI Overviews on a schedule. It turns a topic into realistic prompt variations automatically, measures visibility and sentiment over time, and benchmarks share of voice against named competitors. It runs on your own infrastructure using your own API keys, so there's no vendor markup and no third party holding the data it collects.

Tracking whether your brand gets mentioned when someone asks ChatGPT or Claude for a recommendation in your categoryBenchmarking your AI visibility against two or three named competitors over timeCatching a sentiment shift in how an AI assistant describes your product before it shows up in support ticketsDeciding where to focus content efforts by seeing which AI platforms already cite you and which ignore you

Price: Free; free tier available
Free tier: Yes; no card required
Platforms: 2; Web · API

What you get free vs paid

Verdict

Where it wins and loses

Pros

Genuinely free, not a freemium teaser: it's open source and self-hosted, so the software itself never carries a subscription fee
Bring-your-own-key model means you pay providers directly at their own rates instead of a markup on top
Covers four surfaces at once: Claude, ChatGPT, Gemini, and Google AI Overviews
Automatic prompt generation saves the manual work of writing dozens of realistic customer-style questions by hand
API keys are encrypted at rest and never leave your own infrastructure, per the project's own documentation

Cons

Self-hosting means setup work most SaaS competitors skip entirely, expect to spend time on deployment and configuration
Small, young project (MIT licensed, low GitHub star count as of this writing), so support is community-driven rather than a vendor help desk
You still pay each AI provider directly for every query the scheduler runs, so heavy daily monitoring across four models adds up in API costs even though the software is free

Worth setting up if you're comfortable self-hosting and want AI-visibility tracking without a $69-to-$2,500-a-month SaaS bill, but budget real time for setup and ongoing API spend since neither is actually zero.
— QuestLoops verdict

Capabilities

Core features

Multi-model monitoring across Claude, ChatGPT, Gemini, and Google AI Overviews
Automatic prompt generation that converts a topic into realistic query variations
Scheduled daily or weekly monitoring runs to build trend lines over time
Visibility, sentiment, and share-of-voice metrics per topic
Competitor benchmarking side by side against named rivals
Bring-your-own-key architecture with AES-256 encryption at rest
Fully open source and self-hostable under an MIT license

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Common questions

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Is Lettertrace free?

Lettertrace offers a free tier you can use without paying. Browse QuestLoops for verified ways to get more out of it for free.

What are the best alternatives to Lettertrace?

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Community workarounds

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