carparts.comvsrockauto.com

Rockauto edges out Carparts significantly on homepage messaging, 64 to 39. Here's where the gap comes from.

Rockauto is clearer about what it does (33 vs 7 on clarity). Carparts has stronger CTAs (75 vs 50). Rockauto is better at saying who it's for (ICP: 45 vs 15). Rockauto's targeting is decent, while Carparts's is generic. Carparts has a much stronger pricing page (15 vs 0). Rockauto doesn't have a detectable pricing page at all.