Small tools I built because I needed them and could not find the right version.
Web app · v0.91
A free two-way learning app for American English and Brazilian Portuguese. It starts with useful words, sound and situations, then lets grammar catch up with practice.
Version 0.91 includes 2,774 learning items, 5,954 audio clips and 1,110 visual vocabulary cards. No account or API key is required.
Open course · 2026
A free course for learning how language models and the systems around them actually work, from the basic mechanism to RAG, infrastructure, and a working implementation.
Five courses, 103 lessons, 213 knowledge checks, 8 visual study maps and 172 primary sources. Available in American English and Brazilian Portuguese, with no account required.
