A smarter map for every learning path.
Meridian connects subjects, concepts, skill relationships, sources, and age-aware pathways so each learner can move from one clear step to the next.
Quick answer
Koydo Meridianis Koydo’s quality-gated curriculum layer. Concepts in the Koydo catalog are tiered bronze, silver, or gold based on how thoroughly they have been verified. Bronze means the concept is published with at least one authoritative source. Silver means it has been cross-referenced against multiple sources with conflicts resolved. Gold means it has been peer-reviewed by a subject specialist in addition to cross-source corroboration. Meridian is not a separate product or subscription — the tier indicator shows on every concept across all Koydo plans. Marketing claims about Koydo coverage depth cite Meridian counts. For the full methodology see /methods/meridian.
For learners
Concepts become guided choices, practice, stories, songs, labs, and review.
For partners