{"product_id":"newsletter-subject-line-generator","title":"Newsletter Subject Line Generator","description":"\u003cdiv\u003eGenerates 50 newsletter subject lines across 8 open-rate-driven strategies, each paired with matching preview text and labeled by psychological trigger and length, then ranks the top 8 for A\/B testing. Use when writing subject lines for an email newsletter issue, improving open rates, or building a subject line test batch.\u003c\/div\u003e\u003cdiv\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cem\u003eThis skill is delivered as a \u003ccode\u003e.zip\u003c\/code\u003e archive containing the skill in a named folder, matching the Anthropic SKILL.md format. Extract directly into your Claude Code skills directory (\u003ccode\u003e~\/.claude\/skills\/\u003c\/code\u003e) to install — or open and paste the contents into Claude.ai, ChatGPT, or any other AI tool.\u003c\/em\u003e\u003c\/div\u003e","brand":"penguin tree ai","offers":[{"title":"Default Title","offer_id":52289660322094,"sku":"newsletter-subject-line-generator","price":5.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0982\/4203\/6014\/files\/newsletter-subject-line-generator_1264e8fc-08be-43f2-8037-50bceff1136b.png?v=1783640926","url":"https:\/\/penguintree.ai\/products\/newsletter-subject-line-generator","provider":"penguin tree ai","version":"1.0","type":"link"}