Stop paying Mailchimp, HubSpot, or Klaviyo every month for dead, unengaged, and invalid subscribers. Clean up your email list in minutes and boost inbox placement back above 99%.
Drag & drop .CSV, .XLS or Multi-Sheet .XLSX. Instant duplicate removal ($0) + 5-email live SMTP preview.
See how much you save cleaning 5,000 to 100,000 emails with KaijuVerifier:
| Provider | 5,000 Emails | 10,000 Emails | 50,000 Emails | Unknowns Charged? | Multi-Sheet .XLSX |
|---|---|---|---|---|---|
| ⚡ KaijuVerifier | $19 (Never Expires) | $19/mo (Rollover) | $49/mo (Save 88%) | ✅ $0 (100% Free) | ✅ Native Multi-Tab |
| ZeroBounce | $45 | $99 | $390 | ❌ Charged | ❌ CSV only |
| NeverBounce | $40 | $50 | $250 | ❌ Charged | ❌ CSV only |
| Bouncer (UseBouncer) | $40 | $60 | $250 | ✅ Refunded | ❌ CSV only |
| Emailable | $38 | $60 | $225 | ✅ Refunded | ❌ CSV only |
| EmailListVerify | $15 | $27 | $169 | ⚠️ Manual ticket | ⚠️ Single-sheet |
Even 100% opt-in lists accumulate dead weight every month. Cleaning up your email list removes five toxic categories that silently drag down your sender score:
Employees who left their company and consumers who abandoned old Yahoo/AOL/Hotmail inboxes that now return 550 5.1.1 Hard Bounce codes.
Over 1,000,000 temporary domains (10MinuteMail, Mailinator, Yopmail, GuerrillaMail) used to grab lead magnets without ever reading your emails.
Typos like @gmial.com or @gnail.com (which we auto-correct for free) and shared role inboxes (abuse@, postmaster@, compliance@) that trigger spam complaints.
For active newsletter and CRM lists, clean up your email list every 90 days. For cold outreach exports (Apollo, LinkedIn, scraped directories), always clean 100% of the list immediately before launching a sequence.
Archiving 15%–25% of invalid and disposable contacts typically saves $30 to $250/month on ESPs like Mailchimp, Klaviyo, and HubSpot — paying for a $19 KaijuVerifier cleanup many times over in the first month alone.