Stop paying $99–$410/month and losing credits on "Unknown" or greylisted results. Get 99%+ 7-Layer Smart SMTP accuracy, native Multi-Sheet Excel (.xlsx) cleaning, and unused credit rollover starting at $19.
Slide to your monthly email verification volume to see your exact savings:
| Feature / Metric | ⚡ KaijuVerifier | ZeroBounce |
|---|---|---|
| 10,000 Verifications | $19 / mo (or $19 for 5k Non-Expiring Pack) | $99 – $129 |
| 50,000 Verifications | $49 / mo | $390 – $410 |
| 250,000 Verifications | $149 / mo | $1,375 |
| Recurring Free Tier | ✅ 100 / month forever (Full Smart SMTP) | 100 / mo (business domain required) |
| Unknown / Greylisted Billing | ✅ $0 (100% Free — never deducted) | ❌ Charged (1 credit deducted) |
Multi-Sheet Excel (.XLSX) |
✅ Native Multi-Tab Upload & Export | ❌ CSV only (strips Excel sheets) |
| Unused Credit Rollover | ✅ Monthly Rollover + Never-Expiring Packs | ⚠️ Pay-As-You-Go only (subscriptions expire) |
| Disposable Email Registry | ✅ 1,000,000+ domains updated daily | ~250,000 domains |
| Pre-DNS Consumer Typo Guard | ✅ Auto-suggests gmial.com → gmail.com ($0 cost) |
⚠️ Basic syntax only |
| Included Free Deliverability Suite | ✅ B2B Email Finder + 360° SPF/DKIM/DMARC/DNSBL Audit | ❌ Paid add-on or not included |
ZeroBounce is a strong fit if you need bundled DMARC monitor subscriptions, inbox placement seed testing, or SOC 2 Type II enterprise procurement.
For 95% of SaaS products, growth agencies, cold outreach teams, and e-commerce stores, KaijuVerifier delivers identical 99%+ SMTP accuracy at up to 88% lower cost.
Read our in-depth editorial breakdown →Instant client-side pre-scan (0 credits) + live 5-email Smart SMTP sample check before you even sign up.
Compare our real-time latency, composite 0–100 score, and catch-all/typo detection against ZeroBounce — free and without signup:
At 10,000 emails/month, KaijuVerifier Starter costs $19 vs ZeroBounce at $99–$129 (saving 81%–85%). At 50,000 emails/month, KaijuVerifier Growth costs $49 vs ZeroBounce at $390–$410 (saving 88%).
No. ZeroBounce deducts credits for unknown and catch-all checks. KaijuVerifier only charges for definitive Valid or Invalid SMTP verdicts — unknowns, duplicates, and syntax errors are 100% free.
Yes. KaijuVerifier provides a RESTful JSON API (/api/v1/verify-single, /api/v1/verify-batch, and async /api/v1/jobs) with Bearer and X-API-Key authentication, plus HMAC-SHA256 webhooks.