description RedLine13 Overview
Redline13 is an open-source tool that measures website loading speed by simulating a real browser’s connection and rendering process, providing detailed metrics on waterfall analysis and resource timing for optimization.
insights Why this score
RedLine13 ranks #26 of 39 in the Web Pagetest ranking, behind WAPT, ahead of Site Relic.
help RedLine13 FAQ
How good is RedLine13?
RedLine13 scores 5.66/10 (Mediocre) on Lunoo, making it rated in the WebPageTest category.
What are the best alternatives to RedLine13?
See our alternatives page for RedLine13 for a ranked list with scores. Top alternatives include: WAPT, The Grinder, Bitcatcha Server Speed Checker.
How does RedLine13 compare to WAPT?
See our detailed comparison of RedLine13 vs WAPT with scores, features, and an AI-powered verdict.
Is RedLine13 worth it in 2026?
With a score of 5.66/10, RedLine13 is a solid option in WebPageTest. See all WebPageTest ranked.
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