Koydo Meridian
Koydo's quality-gated curriculum layer — bronze, silver, and gold concepts that have been peer-reviewed and cross-source corroborated.
Koydo Meridian is the quality-gated curriculum certification system used inside the Koydo learning platform. It distinguishes which concept content has been corroborated by multiple authoritative sources and reviewed by a subject specialist.
All Koydo plans
What the tiers mean
Bronze tier: concept content is published and ready for adaptive practice, sourced from at least one authoritative reference. Silver tier: concept content has been cross-referenced against multiple authoritative sources and any conflicts have been resolved. Gold tier: concept content has been peer-reviewed by a subject specialist in addition to cross-source corroboration.
The tier is shown in the lesson interface when a learner reviews a concept. Marketing claims about coverage breadth and depth reference the tier breakdown.
What Meridian is not
Meridian is not a separate product or subscription. It is a quality layer that applies to all Koydo plans. Every Koydo learner sees the tier indicator on Meridian-classified concepts regardless of plan.
Meridian does not replace the standard Koydo catalog. It is an evaluation layer on top of it. Legacy catalog content that has not yet been Meridian-evaluated is still served at the same baseline quality bar as before Meridian shipped.
How content moves between tiers
Content is promoted up the tiers as Koydo's curriculum team completes verification cycles. Demotion is rare and happens only when new sources contradict existing content or when a subject specialist flags an error during review.
The tier counts are re-audited on a recurring cadence; the latest counts are published as research notes under /research/.
Published by Koydo Lyceum · last updated May 15, 2026.