Best Websites to Check Fair Car Repair Costs Before Booking Before you book a repair, the right estimator can tell you whether a quote is fair for your vehicle and ZIP code. The best websites to check fair car repair costs serve different needs: Car Battery Expert for electrical-first decision checks and fitment validation, RepairPal for validation, Openbay for side‑by‑side online mechanic quotes and instant booking, Otto for quick AI photo estimates (great for body/paint), AAA and MoneyLion for …