The difference in plans is featured-based:
Flashcards: the Flashcards module only
Learner: includes the Language Learning module, the Flashcard module, but NOT the Bible Reading module
Reader: includes the Bible Reading module, the Flashcard module, but NOT the Language Learning module
Accelerator: includes the Language Learning module, the Flashcard module, and the Bible Reading module (all features)
Key features for each module include:
Language Learning module: lessons, fluency/paradigm drills, and reading comprehension drills
Bible Reading module: Biblical text, built-in dictionary and parsing information, dictionary searching, and Bible index, and auto-generating custom decks based on Bible books/chapters
Flashcard module: preset decks, words that need practice (auto-generated, spaced repetition review), and custom decks
You can learn more about plans, features, and pricing at biblingo.org/plans.