Find out which Substack writers recommend your brand.

Questions people ask

What is Fully Stacked?

Fully Stacked is a free tool that shows which Substack newsletter writers recommend a brand, which only mention it in passing, and which recommend a competitor instead. Every verdict comes with the writer's own words and a link to the post.

Where does the data come from?

Only public Substack posts. Fully Stacked keeps its own library of newsletters and reads their public feeds every few hours. For each post it keeps the title, link, author, date and a short excerpt, plus a quote of up to 300 characters as proof. It does not store whole articles, and for paid posts it only sees the public preview.

How does it decide whether a writer recommends a brand?

AI reads the paragraphs around each mention and rates it as a top pick, a recommendation or a mention in passing, and as positive, neutral or negative. Ratings can be wrong, so each one links to the original post and signed-in users can report a wrong rating.

What is the difference between the library and a live search?

Every search checks Fully Stacked's own library of newsletters first, because it is quicker. A live search then looks across all of Substack right now. It takes a little longer, about a minute, but it is fresher, and anything new it finds is added to the library. Signed-in users get 2 live searches a day.

Is Fully Stacked free?

Yes. Visitors can run 2 searches without an account. Signing in is free and allows 10 searches a day, plus fit checks, campaign briefs and more.

Can a writer ask to be removed?

Yes, at any time, on the writer opt-out page. Once a request is approved the newsletter is no longer fetched and its posts and mentions are hidden from every search and shared report. Open the opt-out page.

Is Fully Stacked connected to Substack?

No. It is an independent tool that reads public Substack content, and it is not affiliated with Substack.