Lettertrace: Monitor how AI talks about your brandSign inInitialize
open-source · bring-your-own-keyTrack your AI visibility, for free.<br>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.<br>Start monitoring: it's freeInstall the CLI<br>works with ChatGPT, Claude & Gemini · self-host in minutes
lettertrace · monitor<br>$ lettertrace run --project acme<br>› querying claude-opus-4-8 across 24 prompts…<br>✓ acme mentioned in 15 / 24 answers<br>share of voice ████████░░░░░░░░ 41%<br>sentiment +0.34 positive<br>top competitor notion · 28%
how it works<br>From a topic to a trend line, automatically.
01<br>Track your topics<br>Add the subjects your buyers ask about, “best CRM for startups”, “email tools for agencies”.
02<br>Auto-generate variations<br>Lettertrace writes the real questions people put to AI assistants, so you monitor how they’re actually answered.
03<br>Trends over time<br>Every run is a datapoint. Watch visibility, prominence, and sentiment move week over week.
04<br>Benchmark competitors<br>Ingest rival brands and see your share of voice, who the models recommend, and how often.
the numbers that matter<br>A data-rich visibility report.<br>Lettertrace turns raw AI answers into the metrics AEO/GEO teams track: visibility, share of voice, prominence, and sentiment, per topic, per model, over time.<br>Brand visibility<br>62%
Share of voice<br>41%
Sentiment<br>+0.34
Competitors
sample answer · claude<br>“For fast-growing startups, a few tools stand out. Acme is a strong pick for teams that want automation without losing their brand voice, while Notion and Linear are popular for docs and issue tracking…”<br>Acme
41%<br>Notion
28%<br>Linear
19%<br>Others
12%
features<br>Everything you need to diagnose AI mentions.
Bring your own key<br>Use your own Anthropic, OpenAI & Google keys. They’re encrypted at rest and never leave your infrastructure.
Multi-model<br>Monitor Claude, ChatGPT, Gemini, and Google AI Overviews side by side. Add more answer engines as they matter.
Variation generation<br>Turn one topic into dozens of natural prompts automatically, no manual prompt-writing.
Sentiment & recommendations<br>Know not just if you appear, but whether the answer speaks well of you, and recommends you.
Share of voice<br>See exactly how often you win the answer versus each competitor you track.
Scheduled monitoring<br>Run daily or weekly on autopilot and build a trend line you can act on.
open source<br>Yours to run, inspect, and extend.<br>MIT licensed, fork it, self-host it, make it yours.<br>Bring your own keys. No usage markup, no middleman.<br>Your data lives in your own Supabase, no vendor lock-in.
self-host<br>$ git clone lettertrace && cd lettertrace<br>$ npm install<br>$ cp .env.example .env.local<br># add Supabase URL + keys<br>$ npm run dev<br>→ http://localhost:3000
Find out what AI says about you.<br>Set up your brand, add a key, and run your first monitor in minutes.<br>Start monitoring, free