Overview
MxToolBox
Email Security & DNS Diagnostic Tools
MxToolBox specializes in email deliverability tools including MX lookups, blacklist monitoring, SPF/DKIM/DMARC validation, and DNS diagnostics.
Limited free lookupsWhoAPI
Established Domain Availability & WHOIS API
WhoAPI provides domain availability checking and WHOIS lookup APIs with a focus on accuracy and bulk operations.
10,000 welcome creditsPricing Comparison
| Pricing | MxToolBox | WhoAPI |
|---|---|---|
| Free Tier | Limited free lookups | 10,000 welcome credits |
| Paid Plans | From $99/month | From $23/month |
| Enterprise | Enterprise plans available | Custom enterprise plans |
| TLD Coverage | All domains supported | 1,500+ TLDs |
Feature Comparison
| Feature | MxToolBox | WhoAPI |
|---|---|---|
| Free Tier | Limited | Limited |
| API Access | Included | Included |
| Bulk Operations | Included | Included |
| Real-time Data | Included | Included |
| WHOIS Data | Not Included | Included |
| DNS Lookup | Included | Limited |
| Domain Valuation | Not Included | Not Included |
| Brand Monitoring | Included | Not Included |
| MCP/AI Integration | Not Included | Not Included |
Which is Better?
Choose MxToolBox if you need
- Best-in-class email diagnostics
- Blacklist monitoring
- SPF/DKIM/DMARC validation
Choose WhoAPI if you need
- Established since 2011
- Comprehensive WHOIS parsing
- Good for bulk availability checks
Consider DomScan Instead
DomScan offers the best of both worlds with comprehensive features and developer-friendly pricing.
- ✓ Free tier: 10,000 credits/month (no credit card)
- ✓ 1,500+ TLDs supported
- ✓ MCP integration for AI assistants
- ✓ Domain valuation, brand monitoring, OSINT
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