{
  "schema_version": "1.1",
  "id": "cloudflare-google-optimize-share-fell-14-to-4-percent",
  "slug": "cloudflare-google-optimize-share-fell-14-to-4-percent",
  "url": "https://groundedkit.com/claims/cloudflare-google-optimize-share-fell-14-to-4-percent/",
  "api_url": "https://groundedkit.com/api/claims/cloudflare-google-optimize-share-fell-14-to-4-percent.json",
  "claim": "Google Optimize's share among A/B testing tools fell from 14% to 4% after it was shut down in 2023 (Cloudflare, 2025)",
  "commonly_cited_as": "\"Which A/B testing tool do sites use?\"",
  "verdict": "verified",
  "verdict_definition": "Primary source found; it says the same thing, the scope matches, and it is reasonably current.",
  "confidence": "medium",
  "rating": {
    "value": 5,
    "best": 5,
    "worst": 1
  },
  "origin": {
    "publisher": "Cloudflare Radar",
    "title": "Cloudflare Radar 2025 Year in Review",
    "year": "2025"
  },
  "quote": "Among A/B testing tools, VWO ’s share grew by eight percentage points year-over-year, extending its lead over Optimizely , while Google Optimize , which was sunsetted in September 2023, saw its share fall from 14% to 4%.",
  "method": "Cloudflare detection of third-party tools on sites it serves, 2025 vs 2024.",
  "drift": [
    "Share of detected A/B testing tools on Cloudflare-served sites, not of all websites",
    "Remaining 4% is likely leftover code from a discontinued product"
  ],
  "interest": "Cloudflare sells network and security services.",
  "safe_rephrasing": "Cloudflare's 2025 data show Google Optimize, discontinued in September 2023, fell from 14% to 4% of detected A/B testing tools, while VWO extended its lead over Optimizely.",
  "sources": [
    {
      "title": "Cloudflare Radar 2025 Year in Review",
      "url": "https://blog.cloudflare.com/radar-2025-year-in-review/",
      "primary": true
    }
  ],
  "kind": "reference_fact",
  "as_of": "2025 (year to date, through early December)",
  "last_checked": "2026-10-17",
  "stale": false,
  "date_reviewed": "2026-10-17",
  "license": "CC BY 4.0",
  "license_url": "https://creativecommons.org/licenses/by/4.0/"
}