DealCheck Defender helps car buyers check the deal in front of them before signing. The mobile-first beta rebuilds the out-the-door price, checks sample APR and loan terms, flags fees and add-ons, explains what to challenge, and creates editable buyer-controlled wording backed by evidence. EV Mode covers battery warranty and health, real-world range, fast charging, recalls/software, replacement risk, FSD ownership, and depreciation. Fictional sample data only—no autonomous dealer contact.