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Comparison

Common Ninja vs Claspo — Popup Builder

Common Ninja and Claspo — Popup Builder both land on Depends.

Common Ninja versus Claspo — Popup Builder
CompareCommon NinjaClaspo — Popup Builder
VerdictDependsDepends
Best forShopify store ownersSmall stores growing email lists
Who it's not forHigh-traffic sites on the free tierBuyers wanting a proven vendor . no independent reviews found
PrivacyOne known CVE: stored cross-site scripting (CVE-2024-11382) in the free WordPress widgets plugin, disclosed January 2025.11No known public vulnerabilities found in the sources reviewed.
Support qualityUsers report frustration with response timesNo user support evidence found
Public sentimentUsers like the widget variety and no-code setup but complain the free plan is restrictive and pricing gets steep.³No independent user reviews of Claspo surfaced; the one Reddit thread reviewed praises competitor OptiMonk instead.
Biggest gotchaFree tier caps at 300 impressions per widget . a traffic spike breaks your widget²'Free' is the only pricing signal . expect limits on impressions or features once you scale14

Pick Common Ninja when

  • Shopify store owners
  • Small marketing sites
  • Multi-widget bundlers on Wix/Webflow
  • Solo founders avoiding code

When Common Ninja is not a fit

  • High-traffic sites on the free tier
  • Buyers needing just one widget
  • Security-sensitive WordPress sites
  • Teams expecting fast support replies

Pick Claspo — Popup Builder when

  • Small stores growing email lists
  • Marketers testing free popup templates
  • Non-technical site owners

When Claspo — Popup Builder is not a fit

  • Buyers wanting a proven vendor . no independent reviews found
  • Teams needing published pricing before signup
  • Anyone expecting a documented security posture
  • Guess: large CRO teams needing advanced analytics and testing depth

Sources

  1. Common Ninja homepagecommoninja.com
    official
  2. Common Ninja All-in-One . Shopify App Storeapps.shopify.com
    official
  3. Widget providers thread . Reddit r/ecommercereddit.com
    review
  4. Common Ninja Reviews | Trustpilottrustpilot.com
    review
  5. Common Ninja Reviews, Pricing & Alternatives . AmpiFireampifire.com
    review
  6. Best Common Ninja Alternative . Elfsightelfsight.com
    review
  7. Free Common Ninja Alternative . Claspoclaspo.io
    review
  8. I Tested 7 Common Ninja Alternatives . WiserNotifywisernotify.com
    review
  9. I tested 8 Elfsight alternatives . WiserReviewwiserreview.com
    review
  10. Common Ninja AI tool overview . AISPacesaispaces.net
    review
  11. Wordfence vulnerability disclosurewordfence.com
    security
  12. CVE-2024-11382 disclosure . Fusedfused.com
    security
  13. Common Ninja + Webflow integrationwebflow.com
    official
  14. Claspo homepageclaspo.io
    official
  15. 20 Best Popup Apps for 2026 . Maestramaestra.io
    review
  16. Popupsmart homepagepopupsmart.com
    official