Introduction
VoilaNorbert is an email finder that also offers verification as an add-on. BillionVerify is a dedicated email verification service. This comparison focuses on what happens when you only need verification β not finding β and why those two use cases lead to very different costs and performance outcomes.
If your goal is to verify existing email lists, clean databases, or validate signups in real time, read on. If you need both finding and verification, the calculus changes and we address that at the end.
Core Verification Features
| Feature | BillionVerify | VoilaNorbert |
|---|---|---|
| Primary Purpose | Dedicated email verification | Email finder (verification is an add-on) |
| Syntax Validation | RFC 5322 compliant, IDN and special character support | Standard RFC validation |
| Domain Validation | Real-time DNS lookup with caching | Basic DNS check |
| MX Record Checking | Deep MX analysis with priority and backup MX detection | Standard MX verification |
| SMTP Verification | Multi-threaded with greylisting detection and retry logic | Standard SMTP check |
| Accuracy Rate | 99.9% | 98% (verification module) |
| Processing Speed | 50K emails/hour | 15K emails/hour |
| API Response Time | <300ms average | ~800ms average |
VoilaNorbert's verification module was built as a supplement to its finder product. That origin shows: the verification API is thinner, slower, and less documented than tools built for verification from day one.
Advanced Detection Capabilities
| Detection Type | BillionVerify | VoilaNorbert |
|---|---|---|
| Disposable Email Detection | 50,000+ domain database with real-time ML updates | Basic disposable detection, smaller database |
| Catch-All Domain Detection | Multi-address testing, pattern recognition, risk scoring, 95% accuracy | Limited catch-all support |
| Role-Based Email Detection | Categorized: generic, support, admin, sales role accounts | Basic role detection |
| Spam Trap Detection | 1M+ identified traps, ISP partnerships, real-time updates | Minimal spam trap coverage |
| Greylisting Handling | Automatic retry logic with intelligent delays | Limited greylisting support |
| International Domains | Full IDN support | Partial support |
Pricing Comparison
VoilaNorbert bundles lead finding and verification into a single subscription. If you only need verification, you pay for features you do not use.
| Volume (verification only) | BillionVerify | VoilaNorbert | You Overpay |
|---|---|---|---|
| 2,000/month | $2 (PAYG) | $49/month (min plan) | $47 (2,350%) |
| 5,000/month | $5 | $99/month | $94 (1,880%) |
| 10,000/month | $10 | $249/month | $239 (2,390%) |
| 50,000/month | $45 | Custom enterprise pricing | Significant |
BillionVerify is pay-as-you-go with no monthly commitment. Credits never expire. View complete pricing details.
If you need email finding too: VoilaNorbert's bundled plans may make sense. The finder feature is their core strength and it works well. But for pure verification workflows β cleaning lists, validating signups, API integration β BillionVerify is purpose-built and substantially cheaper.
API Performance
BillionVerify's email validation API is built for real-time use. VoilaNorbert's API was designed primarily for the finder product, with verification as a secondary endpoint.
| Metric | BillionVerify | VoilaNorbert |
|---|---|---|
| Average Response Time | <300ms | ~800ms |
| Speed Difference | Baseline | 2.6x slower |
| Uptime SLA | 99.99% | No published SLA |
| Infrastructure | Global CDN (15+ regions) | Standard cloud hosting |
| Rate Limit | 100 requests/second | Limited; not publicly documented |
| API Documentation | Full verification API docs with examples | Thin verification-specific documentation |
| Code Libraries | JavaScript, Python, PHP, Ruby, Go, Java | Limited SDK support |
| Webhook Support | Full async processing | Not available for verification |
The 2.6x speed difference matters for real-time validation flows. At 800ms, form validation feels sluggish. At 300ms, it's invisible to users.
Integration Ecosystem
| Category | BillionVerify (25+ integrations) | VoilaNorbert |
|---|---|---|
| Email Marketing | Mailchimp, SendGrid, HubSpot, ActiveCampaign, Klaviyo, ConvertKit | Limited direct integrations |
| CRM | Salesforce, Pipedrive, Zoho CRM | Zapier-based connections |
| Automation | Zapier, Make (Integromat), n8n | Zapier available |
| E-commerce | Shopify, WooCommerce, Magento | Not available |
| Verification-specific | Native bulk email verification workflows | Not available |
Feature Comparison
| Feature | BillionVerify | VoilaNorbert |
|---|---|---|
| Customer Support | 24/7 live support | Email support only |
| Credit Expiration | Never expires | N/A (subscription model) |
| Free Trial | 100 free verifications daily (ongoing) | 50 free lead searches (one-time) |
| Primary Product | Email verification | Email finding |
| Bulk Upload Formats | CSV, Excel, TXT, JSON | CSV |
| Real-time API | Full-featured, documented | Basic, thin documentation |
| GDPR Compliance | Yes | Yes |
| Uptime SLA | 99.99% | Not published |
Pros and Cons
| Aspect | BillionVerify | VoilaNorbert |
|---|---|---|
| Verification Accuracy | 99.9% | 98% |
| Processing Speed | 50K/hour | 15K/hour (3.3x slower) |
| API Response | <300ms | ~800ms (2.6x slower) |
| Pricing for Verification | From $1/1K emails | $49+/month regardless of volume |
| Free Tier | 100 verifications/day (ongoing) | 50 lead searches (one-time) |
| 24/7 Support | Yes | No |
| Email Finding | No | Yes (core feature) |
| API Documentation | Comprehensive | Thin for verification |
| Integration Count | 25+ | Limited |
| No Monthly Commitment | Yes (PAYG) | No (subscription required) |
| Credits Expire | Never | N/A |
Migration Guide
Switching from VoilaNorbert verification to BillionVerify takes under 20 minutes.
| Step | Task | Time |
|---|---|---|
| 1 | Create free BillionVerify account at billionverify.com β no credit card required | 2 min |
| 2 | Go to API Settings and generate your API key | 1 min |
| 3 | Replace VoilaNorbert verification endpoints with BillionVerify | 10 min |
| 4 | Test with 100 free daily credits | 5 min |
| 5 | Update bulk upload workflows if applicable | 5 min |
Before (VoilaNorbert verification):
After (BillionVerify):
BillionVerify returns more data per verification call: disposable status, catch-all flag, role account flag, and spam trap risk β without extra cost.
Customer Reviews
Marcus Chen, Head of Growth at SaaSFlow 5/5 stars "We used VoilaNorbert for email finding, but paid $249/month and only used the verification features. Switching to BillionVerify for verification cut that cost to about $80/month for the same volume. VoilaNorbert is great at finding emails β just don't use it as your primary verifier."
Priya Anand, Email Operations Lead at RetailReach 5/5 stars "The API response time difference is real. VoilaNorbert's verification endpoint was consistently around 700-900ms. BillionVerify is under 300ms. For our signup form validation, this made a noticeable difference in perceived load time."
Tom Baxter, CTO at LeadFlow Agency 5/5 stars "VoilaNorbert is good at what it's built for: finding emails. But we needed bulk verification for 200K contacts per month, and paying their subscription rate was unsustainable. BillionVerify processed our entire list 3x faster and at a fraction of the cost."
Which Service Is Right for You?
Choose BillionVerify If:
| Scenario | Why BillionVerify |
|---|---|
| You already have email lists to verify | You need verification, not finding β BillionVerify is built for this |
| You need real-time signup validation | 300ms API response vs 800ms makes a difference in form UX |
| You want to avoid monthly subscriptions | PAYG pricing, credits never expire, no commitment |
| You verify high volumes | 50K/hour processing vs 15K/hour β 3.3x faster |
| You need 24/7 support | VoilaNorbert only offers email support |
| Budget matters | At 5K emails/month, BillionVerify costs $5 vs $99 for VoilaNorbert's next tier |
Choose VoilaNorbert If:
| Scenario | Why VoilaNorbert |
|---|---|
| You need email finding | VoilaNorbert's core product β find emails by name and company |
| You want finding and verification bundled | One subscription covers both workflows |
| Your volume is under 2K emails/month | The $49 plan includes finding, which you may need anyway |
| You do outbound prospecting | Building email lists from scratch is VoilaNorbert's strength |
Frequently Asked Questions
Is VoilaNorbert an email verification service?
VoilaNorbert is primarily an email finder. Verification is an add-on feature, not the core product. This distinction matters: verification tools built from the ground up for that purpose tend to be faster, more accurate, and better documented for verification use cases.
How much cheaper is BillionVerify for verification-only use cases?
At 2,000 verifications per month, BillionVerify costs $2 (PAYG) versus VoilaNorbert's minimum $49/month plan. At 5,000/month, it's $5 versus $99. At 10,000/month, it's $10 versus $249. The gap is enormous because BillionVerify's per-email cost is $0.001 while VoilaNorbert charges fixed subscription tiers designed to bundle finding with verification.
Can I keep VoilaNorbert for finding and use BillionVerify for verification?
Yes, and many businesses do exactly this. Use VoilaNorbert's finder to discover email addresses, then run those addresses through BillionVerify to verify deliverability before sending. This combination costs less than using VoilaNorbert for both.
How does the accuracy difference affect my campaigns?
A 1.9% accuracy gap (99.9% vs 98%) means 1,900 additional invalid emails per 100K verified. For a 100K cold email campaign, those 1,900 bounces could damage your sending domain reputation. Most ESPs suspend accounts that exceed 2% bounce rates.
Does BillionVerify detect disposable emails as well as VoilaNorbert?
BillionVerify maintains a database of 50,000+ disposable email domains with real-time ML updates. VoilaNorbert's disposable detection uses a smaller, less frequently updated database. For disposable email detection, BillionVerify catches more.
Does BillionVerify offer catch-all domain detection?
Yes. BillionVerify tests catch-all domains with multi-address probing, pattern recognition, and risk scoring at 95% accuracy. See the catch-all verifier for details. VoilaNorbert has limited catch-all support.
What happens if I need to scale verification quickly?
BillionVerify processes 50K emails/hour with a 100 requests/second API rate limit. VoilaNorbert processes 15K/hour. If you need to verify 500K emails, BillionVerify finishes in 10 hours versus VoilaNorbert's 33 hours.
Do BillionVerify credits expire?
No. Credits never expire. You buy when you need and use them at your own pace. VoilaNorbert uses a monthly subscription model, which means unused verifications are lost at the end of each billing period.
Can I verify role-based emails like info@ or support@?
Yes. BillionVerify's role-account detection identifies and categorizes role-based addresses β generic (info@, contact@), support (help@, support@), admin (admin@, webmaster@), and sales (sales@, business@) β so you can filter them from campaigns that need personal engagement.
Is there a free trial?
BillionVerify gives you 100 free verifications every day with no credit card required. VoilaNorbert offers 50 free lead searches as a one-time trial. BillionVerify's daily free credits let you test and run small workflows continuously at no cost.
Conclusion
| Metric | BillionVerify | VoilaNorbert | Winner |
|---|---|---|---|
| Verification Accuracy | 99.9% | 98% | β BillionVerify |
| Processing Speed | 50K/hour | 15K/hour | β BillionVerify (3.3x faster) |
| API Response Time | <300ms | ~800ms | β BillionVerify (2.6x faster) |
| Cost at 5K/month | $5 | $99/month | β BillionVerify (95% cheaper) |
| Free Tier | 100/day ongoing | 50 searches one-time | β BillionVerify |
| 24/7 Support | Yes | No | β BillionVerify |
| Email Finding | No | Yes | VoilaNorbert |
| API Documentation | Comprehensive | Thin for verification | β BillionVerify |
| No Monthly Commitment | Yes | No | β BillionVerify |
Verdict: For pure email verification, BillionVerify is the clear choice. It is faster, more accurate, better documented, and dramatically cheaper for verification-only workloads. VoilaNorbert is a solid email finder β if that is what you need, it is the right tool. But paying $99-249/month for a subscription when you only use the verification module is hard to justify when BillionVerify handles the same job for $5-10.
Start with 100 free verifications daily at billionverify.com β no credit card required.