A/B Testing & Experimentation · Vendor file
GTmetrix
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Verified representative
B4 has approved a representative’s authority to speak for this company. This is not a product endorsement.
GTmetrix is a free tool to test and monitor your page's performance. Using Lighthouse, GTmetrix generates scores for your pages and offers actionable recommendations on how to optimize them.
Categories GTmetrix serves
The B4 Index places GTmetrix in one category. Each category page lays out the build-versus-buy considerations for that decision.
The B4 Index scores every software category on two axes, strategic differentiation and AI feasibility, to
classify it Build, Buy, Bridge, or Beware. Vendor facts here are independent of that call. See the full
methodology.