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The headline analyzer scores a single headline on five axes: length (chars and words), word balance (common, uncommon, power, emotional), type (how-to, list, question, statement), readability of the headline itself, and platform-tuned ideal length.
Power and emotional word lists are drawn from public-domain marketing lexicons. Words that match neither power nor emotional are tagged as "common" (everyday) or "uncommon" (interesting / unfamiliar).
The composite score is heuristic, not a prediction. Use it as a first-pass filter, then A/B test in production.