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BuilderProof is a community-editable benchmark of AI app builders. We publish our methodology, version-stamp every score, and re-test on a monthly cadence.
Benchmarks measure whether you can leave an AI app builder with your code. Almost none measure whether you can leave with your data. A proposed sixth-family BuilderProof axis with a five-check rubric and preliminary, docs-based reads of five builders.
Four v0 by Vercel alternatives, Lovable, Bolt.new, Replit and Base44, scored on BuilderProof's neutral six-axis 2026 rubric. See which one replaces v0 for a full-stack build, and when to stay on v0.
Four Bolt.new alternatives, Lovable, v0, Replit and Base44, scored on BuilderProof's neutral six-axis 2026 rubric. See which one replaces Bolt for your build, and when to stay on Bolt.
The 2026 prompting guides of Lovable, Bolt and v0 all say prompt wording changes the output. So a single prompt cannot benchmark a builder. Why prompt sensitivity is a validity threat, and what a fixed, versioned prompt suite looks like.
AI app builders swap default models and scaffolding almost weekly. Read from five 2026 vendor changelogs: why an undated benchmark score decays, and the versioning protocol BuilderProof uses to keep scores reproducible.
Three rigorous, independent AI app builder benchmarks now exist: UI-Bench (design), From Prompt to Product (human end-to-end), and BuilderProof's six-axis rubric. What each measures, mapped side by side from the primary sources.
Four Replit alternatives, v0, Bolt, Lovable and Base44, scored on code portability, deploy quality and auth posture with BuilderProof's neutral 2026 rubric. v0 and Bolt only tie Replit at 23/30; none beat it.
As of July 2026 the five builders in our cohort bill in five incompatible units. We propose a sixth BuilderProof axis, Cost-to-Ship, that fixes the workload and measures real dollars to a deployed app. Open for review until August 3, 2026.
We scored v0, Replit, Lovable, Bolt.new and Base44 across six documented axes and summed them into one composite ranking. See the 2026 leaderboard, who wins each axis, and how to reproduce every score.
Every builder now makes pretty output; the code underneath diverges. We score five AI app builders on visual fidelity, code structure, and functional correctness against one fixed brief. Lovable leads at 93/100.
Replit, v0, Bolt and Lovable scored as Base44 alternatives on code portability, deploy quality and auth posture, using BuilderProof's published rubric. Neutral, sourced, and dated July 9, 2026.
Deploying is solved; deploy quality is not. We score five AI app builders on the SEO, accessibility, and performance of the app they actually ship. v0 leads at 9/10.
