Used For

• +**Your email bounces went from 12% to under 2%** → No more provider penalties, your domain reputation stays clean
• +**You're manually checking 5,000 leads per week for 2 hours** → API does it in 10 minutes with 95% accuracy
• +**Scraped email lists are 40% invalid and wasting $0.01 per send** → Filters out fake addresses before you pay to send
• +Catches typos like 'gmial.com' and suggests 'gmail.com' — saves addresses your competitors lose
• +Risk scoring flags disposable emails and spam traps that other tools miss

Best For

• >Your email campaigns are bouncing 10%+ and your provider is sending angry warnings
• >You're scraping leads or buying lists that turn out to be 40% garbage
• >SendGrid or Mailchimp is charging you penalties for high bounce rates

Not For

• -Teams sending under 10,000 emails per month — the free tier's 100 daily credits won't cover even one client list
• -Enterprises needing SOC2 compliance — you'll want Kickbox or ZeroBounce for the security certifications
• -Anyone wanting set-it-and-forget-it — you'll need monthly re-scans or bounces creep back up to 3-5%

Pairs With

• *Mailchimp (to clean your lists before campaigns so you don't get flagged for high bounces)
• *Klaviyo (for ecommerce email lists that need regular cleaning to maintain deliverability)
• *Lemlist (to verify cold email prospects before outreach so you don't waste sends on dead addresses)
• *Zapier (to auto-clean new leads as they come in, though it doubles your credit usage)
• *HubSpot (to clean imported lists before they poison your sender reputation)
• *SendGrid (to avoid the overage fees that hit when your bounce rate spikes above 5%)

The Catch

• !Credits burn faster than expected — bulk re-verification of a 20k list can hit you with a surprise $50 overage
• !The free tier is too stingy for real work — 100 credits covers one test, then you're paying $13/month
• !Large uploads (50k+) can take 45 minutes and sometimes time out, forcing you to split into smaller batches

Bottom Line

Saves you more in email provider fees than it costs — rare for a SaaS tool.