{"id":"mkt-ab-test-ad-variants","audience":"marketing","category":"social-content","technique":"context","title":"Write A/B ad variants that test only one thing","free":true,"task":"You're setting up an A/B test of Talkwise's Facebook ad, and the test plan says only the headline changes. Write exactly 4 plain-text lines labeled \"A headline:\", \"A body:\", \"B headline:\" and \"B body:\", nothing else. Headline A leads with the 10-minutes-a-day benefit, headline B leads with the current price, and the two body lines must be word-for-word identical. Keep the whole thing under 60 words. Write a prompt that gets those variants.","materialLabel":"Test plan (attached to your prompt automatically)","material":"TALKWISE - Facebook ad test plan, November\n\nProduct: Talkwise, an app with short daily Spanish and French lessons you practice out loud.\n\nAudience: adults 30-50 in the US who \"always meant to learn a language\" and say they don't have time.\n\nHypothesis: people who say they don't have time care more about the time cost than the money cost. A headline that leads with \"10 minutes a day\" will beat one that leads with the price.\n\nWhat we're measuring: click-through rate on the ad. Run for 14 days, 50/50 split, same image (the woman ordering coffee in Madrid).\n\nFacts we can use:\n- Lessons take about 10 minutes a day.\n- Spanish and French. (Italian is coming next year, not announced, don't mention it.)\n- You speak out loud and get feedback on your pronunciation.\n- Cancel anytime.\n- Price: $9 a month.\n\nPRICING UPDATE (Nov 2, from finance): the monthly price is now $11 a month for all new subscribers. Update every ad. The $9 price is gone.\n\nLast quarter's winning body copy: \"Order dinner in Spanish by spring. Short lessons you say out loud.\"\n\nCTA button (set in Ads Manager, not in the text): Start learning","rules":[{"type":"maxWords","max":60},{"type":"plainText"}],"mistakes":[{"title":"Not telling it what's being tested","why":"Asked for \"two versions\", the AI rewrites everything, so you can't tell which change made the difference.","fix":"Add: \"Only the headline changes. Both body lines must be word-for-word identical.\"","checks":["r0"]},{"title":"Leaving the headlines vague","why":"Without the hypothesis, the AI writes two similar clever headlines, and it may use the old $9 price.","fix":"Add: \"Headline A: the 10-minutes-a-day benefit, no price. Headline B: leads with $11 a month.\"","checks":["r1"]},{"title":"Not giving the layout","why":"AI adds a test summary, bold labels and tips on running the test.","fix":"Add: \"Exactly 4 lines labeled A headline:, A body:, B headline:, B body:. Nothing else, plain text.\"","checks":["r2","plainText"]},{"title":"Trusting the AI to count words","why":"AI is bad at counting. Ask for \"under 60 words\" and it often lands well over.","fix":"Cap each part: \"each headline under 8 words, the body under 15 words.\"","checks":["maxWords"]}],"promptHints":[{"label":"Says what's being tested","patterns":["only the headline","identical","same body","one (variable|thing)","hypothesis"]},{"label":"Defines each headline","patterns":["10 min","benefit","price"]},{"label":"Uses the updated price","patterns":["\\$?11","update","nov(ember)? 2","current price"]},{"label":"Gives the exact layout","patterns":["a headline","label","4 lines","four lines"]},{"label":"Sets a word limit","patterns":["\\d+\\s*words","word (limit|count)"]}],"hint":"An A/B test only teaches you something if one thing changes. Tell the AI what's being tested, what each version leads with, which price is current, and the exact layout you need.","rubricLabels":["The A body line and the B body line are word-for-word identical, so only the headlines differ","Headline A leads with the 10-minutes-a-day benefit and does not mention price; headline B leads with the price stated as $11 a month (never $9); nothing mentions Italian","The reply is exactly 4 lines, labeled in this order 'A headline:', 'A body:', 'B headline:', 'B body:', with no intro, headings or notes"]}