Track your AI visibility for free (using your own API keys!)
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.
Mathew here. I'm the founder of The Letter Company.
Today, we're debuting one of my favorite things that we've ever built. You've likely heard of AEO. Or GEO. Or AI Search. It's a popular space rife with tools. But there's been a big problem: it's pay-to-play. Even to find out how you're doing on AI Search, you need to fork over something crazy like $250/mo.
And I beg.... for what? AI search is effectively measured by a crafty cron job that orchestrates a bunch of model provider calls.
No more $250/mo fees. Now, it's free. Lettertrace is a BYOK telemetry tool for measuring how you're doing on AI search. It's open source. MIT license. Free even on our hosted version. There are no paid tiers. None. Nada. You'll never put down a credit card. We're moving beyond that. It's time we get telemetry on our GEO, just like we had on our SEO, without having to pay for it.
Lettertrace is super easy to use. Like SO easy. Why? Cause it's got an amazing CLI. Just install it, give Claude Code or Codex access, and your coding agent will go to town. It'll add the topics your buyers actually ask about ("best CRM for startups"). It'll generate realistic prompt variations and run them against Claude, ChatGPT, Gemini, and other major LLMs. It'll track visibility, share of voice, prominence, and sentiment.
npm install lettertrace. claude code. prompt. That's it. Or, if you're non-technical, sign-up traditionally.
And it's actually open source. Not open core, none of those gimmicks. A clean MIT license. Bring your own key. You pay the model providers directly, no markup on top. You'll spend ... maybe $3? If you're just paying to measure AI search, you're getting ripped off and we're putting an end to that.
Three things I'd genuinely like feedback on. First, which answer engines matter enough to add next. Second, whether the generated prompt variations read like questions real people ask, because that's the piece I'm least sure about. Third, did the video effectively explain our purpose as a company?
“Track your AI visibility for free (using your own API keys!)”
Lettertrace launched on Product Hunt on August 12th, 2026 and earned 219 upvotes and 42 comments, earning #2 Product of the Day. 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.
On the analytics side, Lettertrace competes within Open Source, Analytics, Marketing and GitHub — topics that collectively have 750.3k followers on Product Hunt. The dashboard above tracks how Lettertrace performed against the three products that launched closest to it on the same day.
Who hunted Lettertrace?
Lettertrace was hunted by fmerian. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Lettertrace including community comment highlights and product details, visit the product overview.
fmerian
Hey Product Hunt!
Mathew here. I'm the founder of The Letter Company.
Today, we're debuting one of my favorite things that we've ever built. You've likely heard of AEO. Or GEO. Or AI Search. It's a popular space rife with tools. But there's been a big problem: it's pay-to-play. Even to find out how you're doing on AI Search, you need to fork over something crazy like $250/mo.
And I beg.... for what? AI search is effectively measured by a crafty cron job that orchestrates a bunch of model provider calls.
No more $250/mo fees. Now, it's free. Lettertrace is a BYOK telemetry tool for measuring how you're doing on AI search. It's open source. MIT license. Free even on our hosted version. There are no paid tiers. None. Nada. You'll never put down a credit card. We're moving beyond that. It's time we get telemetry on our GEO, just like we had on our SEO, without having to pay for it.
Lettertrace is super easy to use. Like SO easy. Why? Cause it's got an amazing CLI. Just install it, give Claude Code or Codex access, and your coding agent will go to town. It'll add the topics your buyers actually ask about ("best CRM for startups"). It'll generate realistic prompt variations and run them against Claude, ChatGPT, Gemini, and other major LLMs. It'll track visibility, share of voice, prominence, and sentiment.
npm install lettertrace. claude code. prompt. That's it. Or, if you're non-technical, sign-up traditionally.
And it's actually open source. Not open core, none of those gimmicks. A clean MIT license. Bring your own key. You pay the model providers directly, no markup on top. You'll spend ... maybe $3? If you're just paying to measure AI search, you're getting ripped off and we're putting an end to that.
Three things I'd genuinely like feedback on. First, which answer engines matter enough to add next. Second, whether the generated prompt variations read like questions real people ask, because that's the piece I'm least sure about. Third, did the video effectively explain our purpose as a company?
Code: github.com/letterstory/lettertrace