LifterLMS
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LifterLMS ships a free core plugin on WordPress.org that already handles course creation, lessons, and basic quizzes, which makes it a lower-commitment entry point than LearnDash's licensed-from-day-one model. Serious functionality, drip content, advanced quizzes, integrations, comes through paid add-on bundles priced from roughly $149 a year upward.
Its membership and community features, tiered access levels, gamified achievement badges, are built in more natively than they are in LearnDash, which leans more toward one-off course sales than ongoing membership relationships. It fits a WordPress site owner who wants both course delivery and a membership-style access structure without stacking a separate membership plugin on top.