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Lazyweb vs Good UI

Lazyweb vs Good UI: Best Good UI Alternative for Agentic Design Research

Lazyweb is the stronger pick when the job is giving an AI agent real product references, app-tree context, and screen-version history before designing — free, across 281k+ real app screens. Good UI is the better choice when you want A/B-tested evidence and a documented hypothesis for a specific web conversion pattern (pricing, headlines, forms, checkout) — not a broad library of app screens to browse.

Every claim sourcedHonest verdictFor humans and agents

Updated June 2026

Use Lazyweb if

You want a free, agent-first design research library with 281k+ real app screens, app trees, Design.md-style app files, and screen-version history. [23]

Use Good UI if

Use Good UI when you want A/B-tested evidence and a documented hypothesis for a specific web conversion pattern (pricing, headlines, forms, checkout) — not a broad library of app screens to browse. [1]

Honest Comparison Table

CriterionLazywebGood UI
Best for Use Lazyweb when your AI agent needs to research real product patterns before designing. [23]Use Good UI when you want A/B-tested evidence and a documented hypothesis for a specific web conversion pattern (pricing, headlines, forms, checkout) — not a broad library of app screens to browse. [1]
Pricing Free. [23]Freemium — free browsing layer; paid membership gates results. Solo $72/mo ($60/mo billed annually), Team $144/mo ($120 annual), Expert-Guided ~$1,950/mo annual. Datastories PDFs $289 one-time. [1]
Library depth 281k+ real app screens across iOS apps and marketing pages. [23]Self-reported (June 2026): 141 patterns from 625 searchable A/B tests, plus 112 "Leaks" of competitor experiments, on a stated 143.5M-visitor sample. A curated evidence corpus, not a large screenshot gallery. Figures are unaudited. [1]
Platform coverage iOS apps and marketing pages today; web-app flows are not available yet. [23]Web only — Home/Landing, Product, Listing, Checkout, Pricing, Cart, Signup, Thank You across ecommerce, SaaS, and lead-gen. "Mobile" means responsive web, not native iOS/Android app screens. [1]
MCP / API Agent-first MCP setup across Codex, Claude Code, Cursor, Antigravity, hosted Claude connector paths, and other agentic platforms. [23]No official MCP or public API (verified June 2026). No developer/API page in site nav, no programmatic access in any pricing tier, and no third-party wrapper. Content is human-facing web pages plus PDFs. [1]
Agent readiness Built for agents first, with skills that generate competitive analysis and large research reports. [23]Low for autonomous agents: no MCP, no API, no exportable feed, and the highest-value data (effect sizes, winners, sample sizes) is behind a paid login. The free prose and screenshots are fetchable but unstructured — read page-by-page, not queried. [1]

What Good UI does well

  • Evidence-led: each pattern ties to real A/B tests with a hypothesis, before/after variants, and (for members) measured effect sizes and sample sizes.
  • Unusually honest — publishes losers and flat results, not just winners.
  • Useful free browsing layer: pattern write-ups, test descriptions, and before/after screenshots are readable without paying.
  • Tightly organized for conversion work: filter by screen, tag, metric, and device to find evidence for a specific decision.

Where Good UI is limited

  • No agent-native access — no MCP and no public API, so it can't be queried programmatically.
  • Web-only and conversion-scoped: no native iOS/Android app-screen corpus, no app trees, no per-app design files.
  • The high-value data (effect sizes, winners, sample sizes) is paywalled behind a membership starting at $60/mo annually.
  • Modest, curated scale (141 patterns / 625 tests) optimized for depth of evidence, not breadth of visual reference.

Where Lazyweb shines

  • Free access makes it easy to start without buying a seat before research begins.
  • Agent workflows can pull references, app trees, and structured design context instead of relying on generic taste.
  • Screen-version history lets agents see how a real product's UI evolved over time, not just one snapshot.

Where Lazyweb is limited

  • Lazyweb does not yet have web-app flows; flows are mobile-first today.
  • Human-facing advanced filters are thinner than some paid human-first libraries.
  • The product is intentionally agentic-first, so purely manual browsing may feel less polished than specialist galleries.

What people say

Public sentiment is thin and skews old — the most substantive independent discussion is a ~10-year-old Quora thread and a 2020 Hacker News thread, with no surfaced G2/Capterra/Trustpilot/Product Hunt ratings. Where designers engage, reaction is mixed-to-skeptical: they value an evidence-flavored pattern library that publishes losing and flat tests, but criticize opaque methodology, doubt that one site's result generalizes, and argue "A/B testing is not design." Several note some patterns restate Nielsen-Norman heuristics, and that the public Tests view shows what changed but not the result. Treat sentiment as low-signal.

What people praise

  • Seen as a useful, practical resource for conversion-oriented UI ideas grounded in real experiments
  • Transparency is valued: publishes winners, flat results, and losers rather than cherry-picking
  • Library framing (140+ patterns from 600+ tests, new tests monthly) called a helpful starting point for designers, PMs, and founders
  • Draws an active contributor community sharing their own A/B test results

Common complaints

  • Methodology opacity is the loudest gripe — "only talks about A/B testing and data without explaining their process" (Bowen Li, 93 upvotes)
  • Generalizability: a result from one site isn't a universal rule, which critics say GoodUI never addresses
  • Pushback on the "data-driven design" premise — "A/B testing is not design... a gimmick"
  • Some patterns seen as repackaged Nielsen-Norman prior art
  • Public Tests view shows the change but not the magnitude — "no way of knowing the quantitative results" (gwern, HN)
  • Skepticism that scraped "Tests"/"Leaks" are even controlled experiments (HN)
  • Its own CTA-before-value layout read by some as a "marketing scam"

How people compare it

  • Rarely compared to Mobbin or Refero — it sits in a different category (A/B-test evidence vs. UI screenshot reference), so head-to-head sentiment is essentially absent
  • On G2 it's auto-grouped with full testing platforms (PostHog, VWO, Webflow), not design-reference tools — an apples-to-oranges fit
  • Versus free options: much substance overlaps with free Nielsen-Norman heuristics and the public pattern list is free, so the value question is whether the paid tier adds enough
  • Pricing sentiment sparse: Datastories seen ~$50 historically, ~$289 recently; little independent price/value validation

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Source Notes

  1. 1. GoodUI Join / membership pricing
    Official pricing page · goodui.org · Primary source for current tiers: Solo $72/mo or $60/mo annual ($720/yr); Team $144/mo or $120/mo annual ($1,440/yr); Expert-Guided ~$1,950/mo annual with 1 monthly test review; all include 625+ tests and 30-day guarantee. No mention of API/MCP/export.
  2. 2. GoodUI Tests (all tests)
    Official docs/listing · goodui.org · Confirms 625 A/B tests, filters by screen (Home/Landing, Product, Checkout, Pricing, Signup, etc.), metric, and Desktop/Mobile device; results gated for members.
  3. 3. GoodUI Pricing A/B Tests (sample list)
    Official listing · goodui.org · Shows exactly what's free vs gated for logged-out users: titles, before/after screenshots, and descriptions are visible; effect sizes ('X.X%'), winners and sample sizes require membership.
  4. 4. GoodUI Patterns
    Official listing · goodui.org · Confirms pattern count (#141 latest) and web/conversion scope; full pattern detail/evidence gated.
  5. 5. GoodUI Datastories
    Official product page · goodui.org · Older one-time product: 26 in-depth A/B case studies as PDFs for $289 via Gumroad; cites 1,533 testing days, 92% success, 23% median impact.
  6. 6. Quora — What do UI/UX designers think of GoodUI's ideas?
    Review site · quora.com · Most substantive independent thread (~10 years old). Four on-topic designer answers; mixed-to-critical. Top answer has 93 upvotes. “The whole site rubs me the wrong way... Some of their "ideas" are straight up copied from the Nielson-Norman list... A/B testing is not design. It never will be... the site design is terrible!”
  7. 7. Hacker News — Leaked UI A/B Tests from Major Websites (goodui.org)
    Hacker News · news.ycombinator.com · 2020 thread, 75 points, 16 comments. Skepticism about whether the scraped diffs are real A/B tests and that no quantitative results are shown. “Where is the data on results? ... they moved an action button above the fold (duh). But no details on how much more effective the move was.”
  8. 8. G2 — GoodUI Alternatives & Competitors
    Review site · g2.com · GoodUI is listed but no user reviews/ratings surfaced; auto-grouped with full A/B testing platforms (PostHog, VWO, Webflow), highlighting weak category fit.
  9. 9. GoodUI homepage
    Official product page · goodui.org · States 141 patterns / 625 tests, 143.5M+ visitor sample, '5+ new tests each month,' lists named companies, and shows site navigation (Patterns, Tests, Leaks, A/B Test This, Contribute, Blog, Get Access) with no API/MCP entry.
  10. 10. GoodUI Leaks
    Official listing · goodui.org · Documents real competitor experiments (Amazon, Airbnb, Booking.com, Etsy) observed in the wild — the 'Leaks' feature.
  11. 11. GoodUI Tests — Pricing, Mobile device filter
    Official listing · goodui.org · Live URL that proves 'Mobile' is a responsive-web device facet of the standard web tests (not a native-app corpus). Useful primary evidence for the platformCoverage claim that GoodUI is web-only.
  12. 12. GoodUI Pattern #114: Less Or More Visible Prices
    Official pattern page · goodui.org · Concrete example of a single pattern's detail page (web conversion / pricing scope), useful to illustrate the free-vs-gated structure at the individual-pattern level.
  13. 13. GoodUI — Fountn design resource directory
    Directory listing · fountn.design · Directory listing categorizing GoodUI as an A/B-tested patterns resource for conversion.
  14. 14. GoodUI Fastforward — Product Hunt
    Product Hunt · producthunt.com · Secondary signal: 2018 launch, 7 upvotes, 'No reviews yet'; describes repeatable AB-tested patterns. Indicates thin UGC.
  15. 15. GoodUI: Learn from Real A/B Test Results — DEV.to
    Third-party review · dev.to · Descriptive third-party overview of GoodUI as an evidence-based learning resource.
  16. 16. A Scientific Method to Pick Your Next A/B Test — Convert.com
    Third-party review · convert.com · Confirms Jakub Linowski as founder and the pattern/probability methodology behind GoodUI.
  17. 17. A Conversion Conversation with GoodUI's Jakub Linowski — Experiment Nation
    Third-party review · experimentnation.com · Interview establishing GoodUI's mission and experimentation-driven approach; favorable but not a user review.
  18. 18. Jakub Linowski on patterns in A/B testing — Omniconvert
    Third-party review · omniconvert.com · Secondary signal on founder credibility and the value of pattern-based testing.
  19. 19. Hacker News — comment on a goodui.org post (footer/CTA critique)
    Hacker News · news.ycombinator.com · Older (2013) tangential thread; criticism aimed at GoodUI's own UI/CTA rather than its substance. “If your domain name is goodui.org and you lead with "A Good User Interface ... is easy to use." you'd better be damned serious about user interfaces.”
  20. 20. indefiniteloop — Ever Growing List of Remarkable UI Design Ideas
    Blog · indefiniteloop.com · Positive blog mention listing GoodUI among recommended resources. “GoodUI.org is a great design resource... I instantly took a liking to GoodUI.”
  21. 21. Rodrigo Maués — A/B Tests with GoodUI.org
    Blog · rodrigomaues.com · Positive, but written by a self-described top GoodUI contributor (affiliated, not neutral). “...currently the top contributor on GoodUI.org with 12 patterns and 13 A/B test results shared.”
  22. 22. Mobbin vs Alternatives (Refero, Page Flows, 11FS Pulse)
    Blog · coolcuration.com · Representative of the Mobbin/Refero UI-reference category — notably does NOT include GoodUI, confirming GoodUI sits in a different (A/B-evidence) niche. “Mobbin is the better choice when depth matters... Refero is the better choice when speed and budget matter.”
  23. 23. Lazyweb
    Lazyweb product page · lazyweb.com · Free design research library for agents, screenshots, app trees, and research workflows.
  24. 24. Lazyweb MCP install
    Lazyweb setup page · lazyweb.com · Agentic setup path for Codex, Claude Code, Cursor, Antigravity, and other MCP clients.