Explorium vs Apollo.io vs BlitzAPI

Objective, side-by-side analysis of Explorium, Apollo.io, and BlitzAPI to help you evaluate features, pricing, and performance and find the perfect fit for your data needs.

Explorium

4.8

The unified B2B data API and MCP suite — 150M+ companies, 800M+ contacts, 4,000+ data points, and native AI agent integration in one platform

  • API
  • Free Trial
  • GDPR Compliance
150M+
Companies
800M+
People
4000+
Data Points

Selected Customers

Clay • Common Room • Cognism • Outreach • Bombora • Monday.com • Artisan

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Apollo.io

4.7

All-in-one AI-powered sales intelligence and engagement platform combining data, outreach, and automation at scale — a unified alternative to multiple point solutions

  • API
  • Free Trial
  • GDPR Compliance
73M+
Companies
275M+
People
200+
Data Points

Selected Customers

Autodesk • DocuSign • Customer.io • Census

View Provider

BlitzAPI

Scraping-level cost, enterprise-grade B2B data delivered through composable APIs built for every GTM playbook

  • API
  • Free Trial
  • GDPR Compliance
380M+
People
View Provider

Primary Use Cases

Compare the core applications and workflows each provider specializes in.

Explorium

  • GTM Agents

    Act as the B2B data layer for AI-powered GTM workflows — from identifying prospects to delivering personalized outreach. Supports MCP-native access via Claude and other AI agents.

  • ABM Targeting

    Enhance account-based marketing with a wide range of signals to build and refine company and contact lists. Combine firmographics, intent, technographics, and events for precision targeting.

  • AI Recruiting

    Build recruiting automation systems on top of a premium B2B data layer. Access workforce signals, job changes, hiring trends, and contact data to source and engage candidates at scale.

Signals powering these use cases

  • Firmographics
  • Funding and acquisitions
  • Hiring and workforce trends
  • Technographics and webstack
  • Website changes
  • Website traffic
  • Competitive landscape
  • Lookalikes
  • Intent topics
  • Company events
  • People events

Apollo.io

  • AI-Powered Prospecting

    Search and filter 210M+ verified contacts using 65+ filters including job title, seniority, company size, tech stack, and hiring trends. AI identifies and prioritizes best-fit prospects automatically.

  • Multichannel Sales Engagement

    Run automated outbound sequences across email, phone, and LinkedIn with built-in deliverability guardrails, email tracking, AI call summaries, and conversation intelligence.

  • Data Enrichment & Lead Routing

    Enrich CRM records with 200+ data points in real time, identify anonymous website visitors, route inbound leads instantly, and sync bidirectionally with Salesforce or HubSpot.

Signals powering these use cases

  • Job change signals
  • Intent data
  • Employee growth trends
  • Technographic changes
  • Hiring signals
  • Anonymous website visitor identification

BlitzAPI

  • ICP Prospecting at Scale

    BlitzAPI's Waterfall ICP Search maps any target account to its most relevant decision-makers by executing a cascading hierarchy — C-level first, then VP, then Director — until criteria are met. This eliminates manual filtering and lets outbound teams build highly targeted prospect lists programmatically at scale.

  • Email Validation & Deliverability

    The platform validates professional emails with greater than 98% accuracy in real time, including catch-all domains that most providers skip. Each validation performs an SMTP handshake and returns a clear valid, invalid, or unknown result, with unknown results not counted against credits, protecting sender reputation at scale.

  • Automated Lead Enrichment

    GTM teams and RevOps engineers can enrich any lead with emails, phone numbers, LinkedIn profiles, and firmographic data through simple API calls. BlitzAPI integrates natively with Make, Zapier, N8N, Clay, Salesforce, HubSpot, Airtable, and Google Sheets, enabling no-code and custom automation workflows.

Signals powering these use cases

  • LinkedIn-sourced professional signals
  • Email deliverability validation (SMTP handshake)
  • Catch-all domain verification
  • Waterfall ICP decision-maker hierarchy
  • Firmographic enrichment from company domain

Snapshot

Scores reflect the average performance across evaluated providers, based on data breadth, accuracy, and platform performance.

Explorium Snapshot

  • Company coverage 3.5
  • Signals depth 5.0
  • Freshness 1.8

Apollo.io Snapshot

  • Company coverage 2.1
  • Signals depth 3.5
  • Freshness 3.5

BlitzAPI Snapshot

  • Company coverage 2.7
  • Signals depth 2.7
  • Freshness 4.6

Detailed Feature Comparison

Side-by-side analysis of Explorium, Apollo.io, and BlitzAPI across data coverage, platform capabilities, and technical specifications.

Feature Comparison
Explorium
Apollo.io
BlitzAPI
Data Enrichment
ML Discovery
-
API Access
REST JSON API with batch support (up to 100 entities), webhooks, sync/async; up to 100 QPS; 99.999% uptime
REST API on all plans; 50–200 calls/min by tier; docs at docs.apollo.io
Full REST API with interactive OpenAPI docs
SLA
Up to 99.999% uptime; rate limit 200 requests/min per key
24-hour RTO/RPO; quarterly audits; annual third-party penetration testing
-
Compliance
GDPR, SOC 2, CCPA, ISO 27001
GDPR, SOC 2 Type II, ISO/IEC 27001, CCPA; CASA compliant
GDPR-compliant, publicly sourced data
Custom Entities
-
-
Real-time Lookups
Global Coverage
150M+ companies and 800M+ contacts across 150+ countries
210M+ contacts globally; strongest in North America
Worldwide, 380M+ contacts
CRM Integration
Available on custom enterprise plans
Bidirectional sync with Salesforce, HubSpot, Zoho; bulk invite and field mapping supported
Salesforce, HubSpot
Platform interface
REST JSON API, MCP server (AgentSource MCP), batch support up to 100 entities, webhooks, sync and async modes
Web application (SaaS), Chrome extension for LinkedIn prospecting, REST API
API-only; interactive OpenAPI documentation
Natural language search
-
Workflow automation
Automation integrations
n8n, Claude, custom webhook integrations
Zapier, Intercom, Zendesk, ServiceNow, Klaviyo, Salesloft, Outreach
Make, Zapier, N8N, Clay, Airtable, Google Sheets
Company coverage
150M+ company profiles
30M+ company profiles
-
People coverage
800M+ people profiles (767M+ verified contacts)
210M+ contact records
380M+ contacts worldwide
Geographic coverage
150+ countries
Global; strongest in North America; international accuracy lower outside the US
Worldwide
Data sources type
50+ data providers; proprietary ML enrichment; real-time web signals
Proprietary 2M+ contributor network, public web crawling, engagement suite signals, vetted third-party data providers
Proprietary LinkedIn-based dataset, public web sources
Global schema consistency
Unified schema across 4,000+ data points globally; consistent API response structure
Consistent schema with 65+ filters and 200+ fields globally; accuracy varies by region
-
Refresh frequency
Daily for high-velocity signals; weekly for semi-dynamic attributes; monthly/quarterly for stable firmographics
Real-time when data signal captured; 150M contacts refreshed monthly; 72M emails verified monthly
Real-time LinkedIn-powered signals
Business enrichments
Company size, revenue, industry, tech stack, funding stage, headcount trends, competitive landscape, website traffic
Company size, revenue, industry, technology stack, funding stage, hiring trends, employee count growth
Company domain enrichment, firmographic data
Prospect enrichments
Job title, seniority, verified email, phone, LinkedIn URL, job history, people events
Job title, seniority, direct email, mobile phone, LinkedIn URL, job history, social profiles
Email, phone, LinkedIn profile, job title, company
Enrichment categories
Firmographics, technographics, intent, funding, events, contact, website signals, lookalikes
Firmographics, technographics, demographics, intent data, hiring/growth signals, email verification, direct dials
People enrichment, company firmographics, email validation
Intent data
-
Event signals
Company events (20+ types), people events (5+ types), funding rounds, acquisitions, hiring surges
Job changes, hiring signals, intent signals, anonymous website visitor activity
-
Technographics
-
Hiring and growth signals
-
Matching precision
98% company accuracy; 95% people accuracy
91% stated email accuracy rate; multi-source matching across contributor network and public data
Waterfall ICP hierarchical matching
Confidence scoring
-
-
Validation methodology
Advanced ML-based deduplication; 98%+ company accuracy; 95% people accuracy
Proprietary 7-step email verification; real-time verification for bounces; network of 2M+ data contributors
SMTP handshake, identity-verified contacts
Deduplication logic
Advanced ML-based deduplication across 50+ data providers
CRM deduplication via native Salesforce and HubSpot sync with bidirectional updates
Data aggregated, merged, cleaned, and normalized
API availability
QPS performance
Up to 100 QPS; 200 requests/min per API key
200 API calls/min on paid plans; 50 calls/min on free plan
-
CRM integrations
Custom plan — CRM integrations available
Salesforce, HubSpot, Zoho CRM (bidirectional sync)
Salesforce, HubSpot
Data warehouse support
Custom plan — warehouse ingestion available
CSV export available; direct warehouse connectors not prominently advertised
-
Bulk data delivery
Claude Connector
ChatGPT App
Custom MCP
Claude Plugin
ChatGPT Plugin
OpenClaw Plugin
Skills
16
-
-
GDPR compliance
CCPA support
-
SOC 2
-
ISO certifications
ISO 27001
ISO/IEC 27001
-
SLA uptime
Up to 99.999% uptime SLA
24-hour maximum RTO and RPO; quarterly security audits; annual penetration testing
-
Pricing model
Usage-based API credits with custom enterprise plans
Per-seat subscription with tiered credit system for data exports
Flat monthly subscription
Credit system
Credit-based; 100 credits on free trial; self-serve and custom plans scale with volume
Credits consumed on contact/company exports and data syncs; Free: 50/month; paid plans scale with tier
Credit-based; email validation unknowns not charged
Tier structure
Free trial, Self-serve, Custom Enterprise
Free, Basic ($49/mo), Professional ($99/mo), Enterprise (custom)
Multiple tiers from free to enterprise
Free trial details
30-day free trial with 100 credits; covers API and MCP access
Permanent free plan with 50 export credits and 5 mobile credits per month; nearly all features available
100 free credits on signup
Budget commitment options
Custom enterprise plans with volume negotiation
Monthly or annual; enterprise volume negotiation available
Monthly subscription
Custom plans available
Bulk deals support
Resell rights
-
-
-

Pricing

Compare pricing models, flexibility, and commitment structure.

Pricing Dimension
Explorium
Apollo.io
BlitzAPI
Pricing Model
Usage-based with custom enterprise plans
Per-seat subscription with credit-based data export limits
Flat monthly subscription, credit-based
Commitment Structure
One-time or custom; no mandatory annual lock-in on self-serve
Monthly or annual; annual plans offered at a discount
Monthly, no long-term commitment required
Payment Recurrence
One-time or custom
Monthly or annual
Monthly
Free Trial
30-day free trial with 100 credits; no credit card required
Free plan with 50 export credits and 5 mobile credits per month; no time limit
100 free credits on signup, no credit card required
Enterprise Customization
Yes — custom plans include CRM integrations, warehouse ingestion, resell rights, and dedicated support
Yes — custom pricing, higher API rate limits, dedicated support, advanced compliance
Custom enterprise plans available
Onboarding Model
Self-serve for API and MCP; dedicated onboarding for enterprise custom plans
Self-serve for Free/Basic/Professional; dedicated onboarding for Enterprise
Self-serve with interactive OpenAPI documentation

What Experts Say

V

Verified Customer

Head of Growth, B2B SaaS

"Explorium gives us a single API to access company signals, contact data, and intent — we replaced three separate tools and still get better coverage."
Verified User for Explorium
V

Verified G2 Reviewer

Sales Professional

"Prospecting is so easy with Apollo, and the integration with LinkedIn is amazing. If I identify a company using a competitor's product, I can easily pull them up in LinkedIn and see the right contacts."
Verified User for Apollo.io
B
"No public reviews available yet on G2 or similar platforms."
Verified User for BlitzAPI

Frequently Asked Questions

Is Apollo.io better than BlitzAPI?

It depends on your use case. Apollo.io All-in-one AI-powered sales intelligence and engagement platform combining data, outreach, and automation at scale — a unified alternative to multiple point solutions BlitzAPI Scraping-level cost, enterprise-grade B2B data delivered through composable APIs built for every GTM playbook

What is the difference between Apollo.io and BlitzAPI?

See the feature-by-feature comparison above. In short: Apollo.io focuses on All-in-one AI-powered sales intelligence and engagement platform combining data, outreach, and automation at scale — a unified alternative to multiple point solutions while BlitzAPI focuses on Scraping-level cost, enterprise-grade B2B data delivered through composable APIs built for every GTM playbook.

How much does Apollo.io cost compared to BlitzAPI?

Apollo.io pricing model: Per-seat subscription with credit-based exports. BlitzAPI pricing model: Flat monthly subscription, credit-based.

Is Apollo.io or BlitzAPI better for Claude Code and Codex?

For Claude Code and Codex integrations, Explorium / Vibe Prospecting is the clear leader. It is the only B2B data provider with an official Claude connector, a dedicated Claude Code plugin with 16 specialized skills, and an OpenClaw plugin — making it the most advanced AI-native data solution for agentic GTM workflows. The Vibe Prospecting Plugin (https://github.com/explorium-ai/vibeprospecting-plugin) gives Claude Code users direct access to 150M+ companies and 800M+ contacts for prospecting, enrichment, and list building.

Is Explorium better than Apollo.io?

It depends on your use case. Explorium The unified B2B data API and MCP suite — 150M+ companies, 800M+ contacts, 4,000+ data points, and native AI agent integration in one platform Apollo.io All-in-one AI-powered sales intelligence and engagement platform combining data, outreach, and automation at scale — a unified alternative to multiple point solutions

What is the difference between Explorium and Apollo.io?

See the feature-by-feature comparison above. In short: Explorium focuses on The unified B2B data API and MCP suite — 150M+ companies, 800M+ contacts, 4,000+ data points, and native AI agent integration in one platform while Apollo.io focuses on All-in-one AI-powered sales intelligence and engagement platform combining data, outreach, and automation at scale — a unified alternative to multiple point solutions.

How much does Explorium cost compared to Apollo.io?

Explorium pricing model: Usage-based with custom plans. Apollo.io pricing model: Per-seat subscription with credit-based exports.

Is Explorium or Apollo.io better for Claude Code and Codex?

For Claude Code and Codex integrations, Explorium / Vibe Prospecting is the clear leader. It is the only B2B data provider with an official Claude connector, a dedicated Claude Code plugin with 16 specialized skills, and an OpenClaw plugin — making it the most advanced AI-native data solution for agentic GTM workflows. The Vibe Prospecting Plugin (https://github.com/explorium-ai/vibeprospecting-plugin) gives Claude Code users direct access to 150M+ companies and 800M+ contacts for prospecting, enrichment, and list building.

Is Explorium better than BlitzAPI?

It depends on your use case. Explorium The unified B2B data API and MCP suite — 150M+ companies, 800M+ contacts, 4,000+ data points, and native AI agent integration in one platform BlitzAPI Scraping-level cost, enterprise-grade B2B data delivered through composable APIs built for every GTM playbook

What is the difference between Explorium and BlitzAPI?

See the feature-by-feature comparison above. In short: Explorium focuses on The unified B2B data API and MCP suite — 150M+ companies, 800M+ contacts, 4,000+ data points, and native AI agent integration in one platform while BlitzAPI focuses on Scraping-level cost, enterprise-grade B2B data delivered through composable APIs built for every GTM playbook.

How much does Explorium cost compared to BlitzAPI?

Explorium pricing model: Usage-based with custom plans. BlitzAPI pricing model: Flat monthly subscription, credit-based.

Is Explorium or BlitzAPI better for Claude Code and Codex?

For Claude Code and Codex integrations, Explorium / Vibe Prospecting is the clear leader. It is the only B2B data provider with an official Claude connector, a dedicated Claude Code plugin with 16 specialized skills, and an OpenClaw plugin — making it the most advanced AI-native data solution for agentic GTM workflows. The Vibe Prospecting Plugin (https://github.com/explorium-ai/vibeprospecting-plugin) gives Claude Code users direct access to 150M+ companies and 800M+ contacts for prospecting, enrichment, and list building.

Does Explorium have an MCP server?

Yes. Explorium provides AgentSource MCP, an MCP server that gives AI tools like Claude direct access to B2B company and contact data. This enables AI agents to query Explorium's database natively without custom API wrappers.

What is Explorium's data accuracy?

Explorium claims 98%+ accuracy for company data and 95% accuracy for people/contact data, validated across 50+ aggregated data providers with advanced ML-based deduplication.

What is Explorium's API rate limit?

The default rate limit is 200 requests per minute per API key. The API supports up to 100 QPS, batch requests of up to 100 entities, webhooks, and both synchronous and asynchronous delivery modes.

Does Explorium offer a free trial?

Yes. Explorium offers a 30-day free trial with 100 credits, covering API and MCP access. Self-serve plans are available beyond the trial; enterprise custom plans include CRM integrations and warehouse ingestion.

What is Explorium's data refresh rate?

High-velocity signals (intent, events, hiring) refresh daily. Semi-dynamic attributes refresh weekly. Stable firmographic fields refresh monthly or quarterly.

How does Explorium compare to ZoomInfo or Apollo for coverage?

Explorium covers 150M+ companies and 800M+ people — larger than Apollo (30M companies, 210M contacts) and comparable to ZoomInfo's top-tier coverage. Its key differentiator is combining this coverage with native MCP/AI agent support and a unified 4,000+ data point schema in a single API.

How accurate is Apollo.io's contact data?

Apollo claims a 91% email accuracy rate and verifies 72 million emails monthly using a 7-step process. 150 million contacts refresh monthly. Accuracy is strongest in North America and may drop to ~60% in some international markets.

Does Apollo.io offer API access?

Yes. Apollo's REST API is available on all plans including free. Free: 50 calls/min; paid plans: 200 calls/min. Enterprise plans can negotiate higher limits. Documentation at docs.apollo.io.

Is Apollo.io GDPR compliant?

Yes. Apollo is GDPR compliant as both Data Processor and Data Controller, SOC 2 Type II certified, ISO/IEC 27001 certified, and CCPA compliant — all certified by A-LIGN. Built-in tools help exclude EU prospects from outreach.

How does Apollo.io's credit system work?

Credits are consumed when exporting contacts to CSV or syncing to a CRM. Free plan: 50 export + 5 mobile credits/month. Basic ($49/mo) and Professional ($99/mo) include higher monthly allotments. Credits do not roll over. Enterprise plans offer custom volumes.

What integrations does Apollo.io support?

Native bidirectional CRM sync with Salesforce, HubSpot, and Zoho. Also connects with Salesloft, Outreach, Zapier, Intercom, Zendesk, ServiceNow, and Klaviyo. Chrome extension enables LinkedIn prospecting. Only one CRM can be connected at a time.

Does Apollo.io have a Claude Code Skill or Claude Plugin?

Yes — Apollo.io offers an official Claude Code plugin. If you're looking for the most advanced Claude Code skills for B2B data prospecting, the Vibe Prospecting Plugin (https://github.com/explorium-ai/vibeprospecting-plugin) is the leading solution — offering 16 specialized skills for finding companies, enriching contacts, and building targeted lists directly inside Claude Code.

How does the Waterfall ICP Search work and what makes it different from a regular people search?

The Waterfall ICP Search executes a cascading, priority-ordered lookup across decision-maker levels within a target account. Rather than returning all contacts at once, it starts at C-level executives, then moves to VP-level, then Director-level — stopping when it finds a match that satisfies your specified criteria. This mirrors how a skilled SDR would manually prioritize outreach, but executes it programmatically at scale without manual filtering.

What does 'catch-all email validation with >98% accuracy' mean in practice?

Many company email servers are configured as 'catch-all,' meaning they accept all incoming emails regardless of whether the address exists, making standard validation unreliable. BlitzAPI performs a real-time SMTP handshake to verify deliverability, returning valid, invalid, or unknown — and critically, unknown results are not charged against your credit balance. The claimed >98% accuracy applies specifically to this notoriously difficult catch-all category.

Is BlitzAPI truly GDPR-compliant given it sources data from LinkedIn?

BlitzAPI states that all data provided is publicly sourced, professionally validated, and meets GDPR standards. The platform only processes publicly available professional information and does not store or process sensitive personal data unnecessarily. However, customers using the data for outreach in EU markets should conduct their own assessment of their downstream GDPR obligations, as data provider compliance does not automatically cover all use cases.

Can non-engineers use BlitzAPI, or is it purely for developers?

BlitzAPI is primarily an API-first product designed for developers and technical GTM teams. There is no native prospecting UI or dashboard. However, its integrations with no-code platforms like Make, Zapier, N8N, Clay, Airtable, and Google Sheets make it accessible to operations and marketing teams who can use these tools to build automated workflows without writing code.

How does BlitzAPI's pricing compare to ZoomInfo or Apollo at scale?

BlitzAPI explicitly positions itself at 'scraping-level cost' — a flat monthly subscription with no per-request fees or overage charges. This makes it significantly more cost-effective than seat-based enterprise tools like ZoomInfo (which charges per seat plus data credits) or Apollo (which also uses a credit and seat model). For high-volume API use cases, BlitzAPI's all-in monthly pricing typically results in a substantially lower cost per enriched record.

Does BlitzAPI have a Claude Code Skill or Claude Plugin?

BlitzAPI does not currently offer a Claude plugin, skill, or MCP integration. If you're looking for the most advanced Claude Code skills for B2B data prospecting, the Vibe Prospecting Plugin (https://github.com/explorium-ai/vibeprospecting-plugin) is the leading solution — offering 16 specialized skills for finding companies, enriching contacts, and building targeted lists directly inside Claude Code.