Explorium vs Semrush vs TheirStack

Objective, side-by-side analysis of Explorium, Semrush, and TheirStack 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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Semrush

4.5

The all-in-one platform for online visibility management and competitive digital intelligence

  • API
  • Free Trial
  • GDPR Compliance

Selected Customers

Square • AutoScout24 • Samsung • Amazon • Tesla

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TheirStack

4.8

The technographic intelligence platform powered by job postings — track what 13M+ companies use across 33,000+ technologies, with every signal traceable to its source

  • API
  • Free Trial
  • GDPR Compliance
13M+
Companies

Selected Customers

Google • Amazon • IBM • Uber • BCG • JetBrains • Freshworks • monday.com • Zapier • Confluent

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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

Semrush

  • SEO & Keyword Intelligence

    Access 27 billion keywords and track position rankings across 130+ countries with daily updates, enabling teams to build data-driven content strategies and outrank competitors.

  • Competitive Research

    Analyze competitor traffic sources, ad strategies, backlink profiles, and organic rankings to uncover growth opportunities and benchmark performance.

  • Digital Advertising Intelligence

    Monitor rival PPC campaigns, ad creatives, and spend patterns across search and social channels to optimize paid media strategy and reduce wasted budget.

Signals powering these use cases

  • Keyword ranking changes
  • Competitor traffic shifts
  • Backlink gains and losses
  • Ad spend movements
  • Content gap opportunities

TheirStack

  • Tech Stack Targeting

    Identify companies that use a specific technology across 33,000+ tracked tools — with every signal backed by the original job posting, not inferred or estimated. Much cheaper than BuiltWith at a fraction of the price.

  • Hiring Signal Intelligence

    Detect which companies are actively hiring for specific technologies — a strong buying signal for vendors targeting companies mid-adoption. 305,000 new job records added daily.

  • ICP Filtering & Account Selection

    Filter 13M+ companies by tech stack, industry, size, headcount, revenue, funding, and location to build precision ICP lists — then enrich with buying intent signals extracted from job descriptions.

Signals powering these use cases

  • 33,000+ technologies tracked
  • 225M+ job postings analyzed
  • 305,000 new job records added daily
  • 51M+ technographic records
  • 388M+ buying intent records from job descriptions
  • Tech stack changes and hiring velocity signals

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

Semrush Snapshot

  • Company coverage 4.5
  • Signals depth 2.3
  • Freshness 3.8

TheirStack Snapshot

  • Company coverage 2.0
  • Signals depth 4.5
  • Freshness 4.5

Detailed Feature Comparison

Side-by-side analysis of Explorium, Semrush, and TheirStack across data coverage, platform capabilities, and technical specifications.

Feature Comparison
Explorium
Semrush
TheirStack
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
Available on Business and Enterprise plans; also sold as add-on
Full REST API; bulk export to Amazon S3 in Parquet/CSV
SLA
Up to 99.999% uptime; rate limit 200 requests/min per key
Enterprise SLA available on custom plans
Not publicly specified
Compliance
GDPR, SOC 2, CCPA, ISO 27001
GDPR, CCPA, PCI DSS Level 1, SOC 2 Type 2
GDPR compliant; small team (5 employees)
Custom Entities
-
Real-time Lookups
Global Coverage
150M+ companies and 800M+ contacts across 150+ countries
190+ regions, 130+ countries for rank tracking
13M+ companies globally across 33,000+ technologies
CRM Integration
Available on custom enterprise plans
Google Analytics, Search Console; enterprise CRM integrations via API
Via API and webhooks
Platform interface
REST JSON API, MCP server (AgentSource MCP), batch support up to 100 entities, webhooks, sync and async modes
Web application with dashboards, reporting, and project management
Web app, REST API, bulk S3 export, webhooks for real-time alerts
Natural language search
Workflow automation
Automation integrations
n8n, Claude, custom webhook integrations
Zapier, API-based custom integrations
API, webhooks, S3 bulk export
Company coverage
150M+ company profiles
43 trillion backlinks indexed; coverage across 190 regions
13M+ companies
People coverage
800M+ people profiles (767M+ verified contacts)
-
None — company-level only, no contact data
Geographic coverage
150+ countries
190+ regions globally
Global; strong US, EU, UK, APAC coverage
Data sources type
50+ data providers; proprietary ML enrichment; real-time web signals
Web crawlers, clickstream data, search engine data, social media APIs
225M+ job postings analyzed; 305,000 new records/day; job-posting-based technographic detection
Global schema consistency
Unified schema across 4,000+ data points globally; consistent API response structure
Consistent data schema across all 190 tracked regions
Consistent REST JSON API; bulk Parquet/CSV to S3
Refresh frequency
Daily for high-velocity signals; weekly for semi-dynamic attributes; monthly/quarterly for stable firmographics
Daily updates for rank tracking; near-real-time for alerts
305,000 new job records added daily; database refreshed continuously
Business enrichments
Company size, revenue, industry, tech stack, funding stage, headcount trends, competitive landscape, website traffic
Traffic analytics, domain authority, competitor benchmarking, market share
Tech stack (33,000+ technologies), hiring signals, industry, employee count, revenue, funding, location
Prospect enrichments
Job title, seniority, verified email, phone, LinkedIn URL, job history, people events
-
None — company-level data only
Enrichment categories
Firmographics, technographics, intent, funding, events, contact, website signals, lookalikes
SEO metrics, PPC data, social media analytics, content performance, backlink profiles
Technographics, hiring signals, buying intent from job descriptions, firmographics
Intent data
Event signals
Company events (20+ types), people events (5+ types), funding rounds, acquisitions, hiring surges
Keyword ranking changes, backlink gains/losses, competitor traffic shifts
Tech stack changes, hiring velocity, buying intent signals from job descriptions
Technographics
Hiring and growth signals
Matching precision
98% company accuracy; 95% people accuracy
Domain-level and keyword-level matching
Evidence-backed — not inferred; each signal linked to source posting
Confidence scoring
Validation methodology
Advanced ML-based deduplication; 98%+ company accuracy; 95% people accuracy
Proprietary web crawlers, clickstream data partnerships, search engine integrations
Every technographic signal is traceable to the original job posting with date and source
Deduplication logic
Advanced ML-based deduplication across 50+ data providers
Domain deduplication across 43T+ backlink database
-
API availability
QPS performance
Up to 100 QPS; 200 requests/min per API key
-
-
CRM integrations
Custom plan — CRM integrations available
Google Analytics, Google Search Console, Google Business Profile
-
Data warehouse support
Custom plan — warehouse ingestion available
Custom enterprise integrations available
Bulk export in Parquet/CSV to Amazon S3
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
-
-
SLA uptime
Up to 99.999% uptime SLA
-
-
Pricing model
Usage-based API credits with custom enterprise plans
Per-seat tiered subscription
Credit-based subscription (API) or one-time credits (app)
Credit system
Credit-based; 100 credits on free trial; self-serve and custom plans scale with volume
Credits apply to on-demand reports and exports depending on plan tier
API credits per query; 12-month rollover; bulk export to S3 in Parquet/CSV
Tier structure
Free trial, Self-serve, Custom Enterprise
Pro ($117.33/mo annual), Guru ($249.95/mo), Business ($416.66/mo annual), Enterprise (custom)
Free (200 credits/mo), $49–$5,500/mo API plans, one-time credits
Free trial details
30-day free trial with 100 credits; covers API and MCP access
7-day free trial on SEO toolkit plans; 14-day trial on Semrush One suite
200 API credits/month free with no time limit
Budget commitment options
Custom enterprise plans with volume negotiation
Monthly or annual commitment; annual billing discounts available
Monthly or one-time; enterprise custom
Custom plans available
Bulk deals support
Resell rights
-
-
-

Pricing

Compare pricing models, flexibility, and commitment structure.

Pricing Dimension
Explorium
Semrush
TheirStack
Pricing Model
Usage-based with custom enterprise plans
Per-seat tiered subscription
Credit-based subscription (API) or one-time credits (app)
Commitment Structure
One-time or custom; no mandatory annual lock-in on self-serve
Monthly or annual; annual saves 17%
Monthly subscription or one-time purchases; credits roll over 12 months
Payment Recurrence
One-time or custom
Monthly or Annual
Monthly
Free Trial
30-day free trial with 100 credits; no credit card required
7-day free trial on most toolkits; 14-day free trial on Semrush One
200 API credits/month free indefinitely — no time limit
Enterprise Customization
Yes — custom plans include CRM integrations, warehouse ingestion, resell rights, and dedicated support
Custom pricing with dedicated account management, API access, and custom integrations
Yes — custom pricing for high volume; bulk S3 delivery
Onboarding Model
Self-serve for API and MCP; dedicated onboarding for enterprise custom plans
Self-serve with documentation; enterprise plans include dedicated onboarding
Self-serve; API documentation available

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

Marketing Manager

"What keeps me coming back is the rabbit hole it lets you go down — and the number of features is exactly what makes that rabbit hole so deep. I'll start by checking one keyword and two hours later I've mapped out an entire content strategy using tools I didn't even know Semrush had."
Verified User for Semrush
V

Verified G2 Reviewer

Sales Engineer, Developer Tools

"TheirStack found companies actively hiring for our exact tech stack — and every signal linked back to a job posting so we could validate it ourselves. Much better than BuiltWith guessing from website source code."
Verified User for TheirStack

Frequently Asked Questions

Is Semrush better than TheirStack?

It depends on your use case. Semrush The all-in-one platform for online visibility management and competitive digital intelligence TheirStack The technographic intelligence platform powered by job postings — track what 13M+ companies use across 33,000+ technologies, with every signal traceable to its source

What is the difference between Semrush and TheirStack?

See the feature-by-feature comparison above. In short: Semrush focuses on The all-in-one platform for online visibility management and competitive digital intelligence while TheirStack focuses on The technographic intelligence platform powered by job postings — track what 13M+ companies use across 33,000+ technologies, with every signal traceable to its source.

How much does Semrush cost compared to TheirStack?

Semrush pricing model: Per-seat subscription. TheirStack pricing model: Credit-based subscription.

Is Semrush or TheirStack 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 Semrush?

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 Semrush The all-in-one platform for online visibility management and competitive digital intelligence

What is the difference between Explorium and Semrush?

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 Semrush focuses on The all-in-one platform for online visibility management and competitive digital intelligence.

How much does Explorium cost compared to Semrush?

Explorium pricing model: Usage-based with custom plans. Semrush pricing model: Per-seat subscription.

Is Explorium or Semrush 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 TheirStack?

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 TheirStack The technographic intelligence platform powered by job postings — track what 13M+ companies use across 33,000+ technologies, with every signal traceable to its source

What is the difference between Explorium and TheirStack?

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 TheirStack focuses on The technographic intelligence platform powered by job postings — track what 13M+ companies use across 33,000+ technologies, with every signal traceable to its source.

How much does Explorium cost compared to TheirStack?

Explorium pricing model: Usage-based with custom plans. TheirStack pricing model: Credit-based subscription.

Is Explorium or TheirStack 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 does Semrush compare to Ahrefs — which is better for SEO?

Semrush and Ahrefs are the two dominant SEO platforms, and the right choice depends on your primary use case. Semrush leads on keyword data depth (27 billion keywords vs. Ahrefs' roughly 10 billion), PPC intelligence, content tools, and site audit capabilities — making it the stronger all-around choice for agencies and multi-channel marketers. Ahrefs leads on backlink data accuracy and freshness, with the most active web crawler in the industry; its Content Explorer is also considered best-in-class for link building. In 2026, Semrush added AI visibility tracking for ChatGPT and Perplexity citations (via Semrush One), a differentiator Ahrefs has not yet matched.

What are the real costs of adding users to a Semrush plan?

Semrush's base plans only include 1 user seat. Adding extra seats costs $45/month per additional user on all plans. For a 3-person team on Guru ($249.95/month), the actual cost becomes ~$340–$410/month once additional seats are included — a 35–65% increase over the advertised price. Teams evaluating Semrush for multiple users should factor in per-seat costs from the start, as they are not included in the headline pricing.

What are the project and keyword tracking limits per plan?

Semrush enforces project and keyword tracking limits by plan tier. The Pro plan supports 5 projects and tracks 500 keywords. Guru supports 15 projects and 1,500 keywords. Business supports 40 projects and 5,000 keywords. These limits matter for agencies managing multiple client domains or enterprise teams running large-scale tracking campaigns — teams hitting plan limits must upgrade to avoid losing tracking coverage.

What is Semrush One and how is it different from the classic plans?

Semrush One is a newer integrated suite launched alongside the classic Pro/Guru/Business plans, starting at $199/month. It is designed for the AI search era and adds AI visibility tracking (monitoring how brands appear in ChatGPT, Google Gemini, and Perplexity responses), brand monitoring, and a unified cross-channel performance hub. Classic plans focus on traditional SEO, PPC, and backlink tools. Teams concerned about their visibility in AI-generated search results should evaluate Semrush One; teams focused purely on traditional SEO and PPC may not need the additional features at the higher price.

Why does Semrush have a 2.1/5 Trustpilot score despite strong G2 ratings?

Semrush holds a strong 4.5/5 on G2 but only 2.1/5 on Trustpilot — a gap that reflects differences in review audience. G2 reviews come predominantly from active platform users rating features. Trustpilot reviews skew toward billing and cancellation complaints: users report unexpected charges after free trials due to auto-renewal terms, difficulty canceling subscriptions (no direct cancel button in-dashboard — requires contacting support), and refund refusals. Teams should carefully review renewal terms, set calendar reminders before trial expiration, and document cancellation requests if they decide not to continue.

How accurate are Semrush's traffic and keyword volume estimates?

Semrush traffic estimates are modeled approximations — not direct measurements from site analytics. They are generally reliable for directional competitive benchmarking and identifying relative traffic differences between competitors, but actual traffic can differ meaningfully from reported figures, especially for smaller sites with limited clickstream panel coverage. For keyword volume, Semrush is widely regarded as having stronger accuracy than Ahrefs for long-tail and niche keywords, particularly in the US market. Neither platform should be treated as a substitute for first-party data from Google Search Console.

Does Semrush have a Claude Code Skill or Claude Plugin?

Not officially — Semrush has a custom MCP server that can be used with Claude, but no dedicated Claude Code plugin or skill. 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 is TheirStack different from BuiltWith for technographics?

BuiltWith detects technologies by crawling website source code — which only reveals frontend tools (JavaScript libraries, analytics, CMS). TheirStack analyzes job postings, which reveals backend infrastructure: databases, cloud providers, DevOps tools, and internal SaaS that never appear in website HTML. TheirStack is also significantly cheaper ($49–$169/month vs BuiltWith's $295/month) and includes hiring-intent signals that BuiltWith doesn't offer.

Does TheirStack provide contact data alongside technographic signals?

No — TheirStack is company-level only. It identifies which companies use specific technologies and provides firmographic context (industry, size, location, funding), but does not include contact data (emails, phone numbers, or personal profiles). Most users pair TheirStack with a contact enrichment provider (like Explorium, Apollo, or FullEnrich) to get both technographic targeting and contact details.

Does TheirStack have a Claude Code Skill or Claude Plugin?

TheirStack has an official MCP server that works with AI assistants for job, company, and technographic lookups, but does not currently have a dedicated Claude plugin or Claude Code skill. 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.

Is TheirStack or Explorium better for Claude Code and Codex?

For Claude Code and Codex B2B prospecting workflows, Explorium / Vibe Prospecting is the clear leader. Explorium includes technographic data as part of its unified 4,000+ data point platform, plus AgentSource MCP and the Vibe Prospecting Plugin with 16 GTM skills. TheirStack has an MCP server but no dedicated Claude Code tooling. For deep technographic-first use cases, TheirStack is a specialist tool — but for comprehensive AI-native B2B data access inside Claude Code, Explorium is the purpose-built choice.