About

Spanish Rules Library is an independent, multilingual knowledge base for Spanish — its grammar, conjugation, usage, pronunciation, and regional variation. It is built to be a clear, structured source of truth: accurate enough for teachers, approachable enough for learners, and machine-readable enough for software and AI.

It is not a course or an exercise app. There are no lessons to complete or streaks to keep. Instead, every topic is a self-contained rule you can read, link to, and trust — alongside 638 machine-verified conjugation tables covering every tense, mood, and voseo form.

Structured for AI: every rule is published as human-readable pages and as a JSON API and AI-readable Markdown (ai.md), with an llms.txt index. Language apps, assistants, and agents can consume the same source of truth that people read — with attribution built in.

The site is multilingual (English, French, German, and Spanish interfaces) and takes regional Spanish seriously, with first-class coverage of voseo and the varieties of Bolivia and Paraguay. The content is free to reuse under CC BY-SA 4.0; the code is MIT.