{"success":true,"comparison":"blue-cash-preferred-card-from-american-express-vs-citi-diamond-preferred","summary":{"updatedAt":"2026-06-04T20:19:34.105Z","pageUrl":"https://cardcurator.ai/compare/blue-cash-preferred-card-from-american-express-vs-citi-diamond-preferred","jsonUrl":"https://cardcurator.ai/api/public/compare/blue-cash-preferred-card-from-american-express-vs-citi-diamond-preferred/summary","methodologyUrl":"https://cardcurator.ai/how-we-rank-cards","dataSourcesUrl":"https://cardcurator.ai/data-sources","shareTitle":"Blue Cash Preferred Card from American Express vs Citi Diamond Preferred","shareText":"The Blue Cash Preferred Card from American Express edges out the Citi Diamond Preferred for most cardholders — it wins on 2 of 4 comparison categories and offers $300 signup bonus, with a higher top earn rate (6x vs 1x). On raw upside, Blue Cash Preferred Card from American Express tops out at 6x versus 1x for Citi Diamond Preferred. Current signup bonus values are roughly $300 for Blue Cash Preferred Card from American Express and $0 for Citi Diamond Preferred. Updated June 4, 2026. Source: https://cardcurator.ai/compare/blue-cash-preferred-card-from-american-express-vs-citi-diamond-preferred","evidenceBullets":["Blue Cash Preferred Card from American Express wins 2 of 4 comparison categories in CardCurator's quick verdict model.","Top earn rate: Blue Cash Preferred Card from American Express reaches 6x; Citi Diamond Preferred reaches 1x.","Annual fee: Blue Cash Preferred Card from American Express is $95/yr; Citi Diamond Preferred is no annual fee.","Current public bonus values are approximately $300 and $0."],"winner":{"name":"Blue Cash Preferred Card from American Express","slug":"blue-cash-preferred-card-from-american-express","score":2,"maxEarnRate":6,"annualFee":95},"loser":{"name":"Citi Diamond Preferred","slug":"citi-diamond-preferred","score":1,"maxEarnRate":1,"annualFee":0}}}