SEO tools that show the math behind the result
The market is full of expensive dashboards that work as black boxes: you enter data, they return a colorful chart and never say which calculation they ran. Here I publish what I use in diagnostics and in class, with the calculation and the model in plain sight. They run in your browser, ask for no sign-up and do not send me your answers. If you want to check how I work before you reach out, start here.
Available now
Three tools and two open collections
Diagnosis
The recognizable brand x-ray
Eighty checks across six symptoms, each one with the source that supports it, to run on your own site. Your answers stay stored in your browser.
Original framework
Cognitive Architecture of SEO
The five layers that support how a page is read, from crawlability to the decision. Click a layer to see what it supports and what breaks when it fails.
Calculator
Cosine similarity
Paste two texts and see the angle between them, with the dot product, the norms and the terms that weigh the most. Useful for investigating cannibalization between two URLs.
Library
Books I recommend
An annotated collection on SEO, information architecture, search and AI. Each entry says why to read it, who it is for and includes the reference ready to copy, with filters by topic and level.
Sources
Links I keep
Official documentation, studies and tools I use as sources in consulting and in class. Each entry says what the source solves and when I last checked that it was still up.