Lettertrace
Open-source AI visibility monitoring for brand mentions in AI answers.
At a glance
Price not confirmed · Source review 2026-11-04- Price & billing
No charge fact is recorded. The homepage states Lettertrace is free end-to-end, developer-first, and open source under MIT, with users bringing their own Anthropic, OpenAI, and Google keys; no $0 figure is stated, and the guessed pricing path returns a 404 page, so the free statement is not converted into a $0 fact.
- Free allowance
The homepage states Lettertrace is free end-to-end, developer-first, and open source under MIT, with users bringing their own Anthropic, OpenAI, and Google keys; no $0 figure is stated, and the guessed pricing path returns a 404 page, so the free statement is not converted into a $0 fact.
- Best suited to
Brands and AEO and GEO teams that want to know how often assistants mention them, where they rank, and whether answers speak well of them.; Developers who want an open-source, self-hosted monitor with no usage markup and no vendor lock-in, with data in their own Supabase.; Teams tracking share of voice against competitors such as Notion and Linear over weekly runs.
Fit is editorial guidance, not a measured result.- Platforms
Access: not separately verified. Operating systems not separately verified.
Published-source facts and editorial guidance. No product test is implied. Confirm current conditions before purchase.
No product screenshot is claimed for this listing. Use the official website ↗ to inspect the current interface.
What to know before choosing
Good fit
Brands and AEO and GEO teams that want to know how often assistants mention them, where they rank, and whether answers speak well of them.; Developers who want an open-source, self-hosted monitor with no usage markup and no vendor lock-in, with data in their own Supabase.; Teams tracking share of voice against competitors such as Notion and Linear over weekly runs.
Limits and trade-offs
Users without their own Anthropic, OpenAI, and Google keys, since Lettertrace is bring-your-own-key by design.; Users who want a fully managed hosted dashboard without self-hosting: setup is cloning, installing, configuring Supabase, and running locally.; Teams whose buyers ask assistants outside the listed Claude, ChatGPT, Gemini, and Google AI Overviews set.
Plans and free allowances
No charge fact is recorded. The homepage states Lettertrace is free end-to-end, developer-first, and open source under MIT, with users bringing their own Anthropic, OpenAI, and Google keys; no $0 figure is stated, and the guessed pricing path returns a 404 page, so the free statement is not converted into a $0 fact.
Evidence
Official homepage ↗ (reviewed 2026-11-04)
Official published documentation reviewed; not a product test
Dates: Last reviewed 2026-11-04. Last reviewed is the latest source or editorial review date; it is not a content-change date.
A closer look at Lettertrace
Lettertrace monitors how AI talks about a brand: track a topic, let Lettertrace generate the real prompts buyers put to assistants, ask Claude, ChatGPT, Gemini, and Google AI Overviews, and trace mentions, position, sentiment, and share of voice over time, as open-source, MIT-licensed software that users self-host with their own keys.
Editorial guidance based on published documentation. The workflow below is a suggested starting point, not a measured product result.
When to choose Lettertrace
- Brands and AEO and GEO teams that want to know how often assistants mention them, where they rank, and whether answers speak well of them.
- Developers who want an open-source, self-hosted monitor with no usage markup and no vendor lock-in, with data in their own Supabase.
- Teams tracking share of voice against competitors such as Notion and Linear over weekly runs.
When to choose something else
- Users without their own Anthropic, OpenAI, and Google keys, since Lettertrace is bring-your-own-key by design.
- Users who want a fully managed hosted dashboard without self-hosting: setup is cloning, installing, configuring Supabase, and running locally.
- Teams whose buyers ask assistants outside the listed Claude, ChatGPT, Gemini, and Google AI Overviews set.
A practical starting workflow
- Track a topic with one line about what buyers ask.
- Generate dozens of natural prompts, ask every model, and read each answer for mentions, position, and sentiment.
- Trace the trend run by run, from visibility and share of voice to competitor movement, and act on what moved it.
Check before committing
- The example brand Acme and its 12-week charts are homepage illustrations, not a customer result.
- Model API costs belong to the user’s own keys; Lettertrace itself adds no usage markup, per the homepage.
Common questions
What does Lettertrace measure?
How often Claude, ChatGPT, and Gemini mention a company, with position, sentiment, and share of voice tracked over weekly runs.
Is Lettertrace really free?
The homepage states it is free end-to-end, developer-first, and open source under MIT, with users bringing their own keys and hosting it themselves.
How does a run work?
Track a topic, generate the questions, ask every model, and trace the trend: one run is one datapoint on the visibility line.
Can I self-host it?
Yes. The homepage gives a self-host route with git clone, install, environment configuration, and a local run, with data in the user’s own Supabase.
Compare approaches for this task
- AgentHub — A platform to build and host AI automations with pre-built workflows.
- AIOProductOS — Product teams that want to build what pays, since the platform ties each customer record to feedback, revenue, work and code.; Companies that need enterprise controls, since the pricing page highlights EU and US data residency, BYOK encryption, SAML/SSO on Pro and 150+ compliance controls.
Sources and checks
Last source review is not a date of product testing. No rating or test result is implied by inclusion. Check the current plan and terms before buying.