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On BuilderProof's six-axis rubric, Replit and Bolt tie 44 to 44 in 2026. Replit wins first-build stability and deployment breadth; Bolt wins output coherence and default-on credential hygiene. A reproducible, documentation-sourced head-to-head.
A reproducible, documentation-based head-to-head: Lovable vs Bolt scored against BuilderProof's six published axes, with an honest per-axis verdict. July 2026, community-editable.
We timed two clocks for each builder: speed-to-first-paint (prompt to first rendered preview) and time-to-working-app (prompt to all acceptance checks passing). v0 by Vercel was fastest to first paint at a median 9 seconds; Base44 and Bolt.new followed. The ranking shifts for time-to-working-app, where full-app builders pay an upfront cost but reach a runnable result with fewer manual edits. We report medians of five cold runs on a fixed network profile, with the full distribution and caveats below.
We gave seven AI app builders one identical brief and scored the output on visual fidelity, code structure and functional correctness using a published, double-rated rubric. Lovable led on overall output quality (93/100), with v0 close behind on component fidelity and Bolt.new strong on framework breadth. Differences were largest in code structure, not visuals: every builder produced something that looked right, but maintainability and correctness diverged sharply. This page documents the brief, the rubric and the per-builder results, with every figure sourced.
