GTM Hub
What is ZeroBounce?
Email validation and deliverability API service founded in 2017 (Santa Barbara, CA). Verifies email addresses, cleans contact lists, builds sender reputation, and monitors inbox health with reported 99.6% accuracy.
Key features
Email Validation
Bulk and real-time email validation with detection of invalid, disposable, inactive, and spam trap addresses
AI Email Scoring
1-10 scale scoring system for email quality prediction
Inbox Placement Testing
Tests email delivery across major providers
Blacklist Monitoring
24/7 monitoring across 200+ blacklist databases
Email Warmup
Automation to establish domain trust
DMARC & DKIM Monitoring
Email server authentication testing and fraud detection
Email Finder
Discover professional B2B email addresses
Activity Data
Engagement signals and insights for scored recipients
ZeroBounce pricing
Freemium tier with 100 monthly credits. Subscription and pay-as-you-go options available. Credits expire 2 years after last purchase for accounts created after June 1, 2026.
| Plan | Price | What's included |
|---|---|---|
| Freemium | $0/month | 100 monthly validation credits, 1 inbox test, 1 email server test, 1 blacklist monitor, 10 email finder credits (credits refill monthly, no expiration during free tier) |
| Pay-As-You-Go | Starting at $39 | 2,000 email validations; 15% discount with autopay; unknown results free; 1 credit per email validation |
| ZeroBounce ONE™ | $99/month | Flexible credits (minimum 10K monthly), Activity Data with Gold recipients, Deep deliverability insights, Premium API rate limits, Faster file processing, VIP 24/7 support, Credits never expire during active subscription, 20% savings with annual billing |
Pros & cons
Pros
- + High accuracy in email validation (4.8/5 on Capterra, 4.7/5 on G2 with 1,407 reviews)
- + Excellent customer support (24/7 live support, highly responsive)
- + Clean, intuitive interface with minimal learning curve
- + Fast bulk list processing
- + SOC 2 Type II and ISO 27001 certified
- + Reduces bounce rates significantly (users report <1% vs. 4% previously)
- + Integrates with 40+ tools and API available in 16 languages
- + Free monthly allowance makes it accessible for testing
- + Well-documented API
Cons
- − Higher pricing compared to competitors ($99/month subscription vs. other verifiers)
- − Catch-all email detection lacks granularity and can be slow/expensive
- − Accuracy claims disputed in independent tests (one review found it missed 127 of 500 bad addresses)
- − Email Finder credit cost not always transparent at checkout
- − Does not track previously validated emails (may charge credits twice)
- − Advanced features have steeper learning curve
- − Most sales are final (limited refund policy)
Who is ZeroBounce best for?
- • Enterprise teams needing SOC 2/ISO compliance
- • Sales organizations managing high-volume email lists
- • Marketing teams running email campaigns at scale
- • Anyone sending high volume emails requiring strong sender reputation protection
- • Teams needing integrated deliverability monitoring alongside validation
Frequently asked questions
What accuracy does ZeroBounce claim?
99.6% accuracy with real-time email validation according to their marketing materials, though independent testing has disputed this claim.
Do credits expire?
Free tier credits refill monthly and don't expire. For paid accounts created after June 1, 2026, credits expire 2 years after last purchase. ZeroBounce ONE subscription credits never expire during active subscription.
How much does Email Finder cost?
Email Finder costs 20 credits per successful query.
What is included with ZeroBounce ONE?
Includes flexible monthly credits (minimum 10K), Activity Data with Gold recipients, deepr deliverability insights, premium API rate limits, faster file processing, and VIP 24/7 support.
