6sense vs Seamless.AI

66sense8.8Visit Seamless.AI8.5Visit

Higher score 6 6sense #5 in B2B Contact Data Providers 8.8/10 Pricing on request ✓ 4 of 4 features Visit 6sense

vs

Seamless.AI #8 in B2B Contact Data Providers 8.5/10 Free plan Free plan✓ 4 of 4 features Visit the platform

• 6sense fits best

  Account-based teams with predictive scoring

• Seamless.AI fits best

  Teams prioritizing database scale

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Side by side

Feature	66sense 8.8/10 Visit ↗	Seamless.AI 8.5/10 Visit ↗
At a glance
Editor score	8.8	8.5
Ranking	#5 in B2B Contact Data Providers	#8 in B2B Contact Data Providers
Best for	Account-based teams with predictive scoring	Teams prioritizing database scale
Pricing model	Paid	Free plan + paid
Starting price	—	—
Free plan	—	✓ (best)
Free trial	—	—
Deployment	Cloud, Browser extension	Cloud, Browser extension
Platforms	Web, Chrome extension	Web, Chrome extension
Support	Docs	Email, Live chat, Docs
Compliance	SOC 2, ISO 27001, GDPR	SOC 2, ISO 27001, GDPR
Integrations	15 integrations	6,000+ integrations
Built for	Mid-market, Enterprise	Solo, Small business, Mid-market, Enterprise
Features 6sense 4/4 · Seamless.AI 4/4
Direct-dial data	✓	✓
Intent data	✓	✓
Technographic filters	✓	✓
API access	✓	✓
Specs
Contact database size	4.5e+08 contacts	1.3e+09 contacts (best)
Monthly export limit	Not checked yet	Not checked yet
Our review
Pros	450M-contact database with verified email and direct-dial data Intent, technographic, persona, and buying-group discovery filters APIs plus CRM, sales-engagement, and CSV export options	1.3B listed contacts with real-time search and verification Direct dials, intent signals, enrichment, and job-change intelligence CRM integrations, Chrome extension, and REST API access
Cons	Pricing requires a contact-sales conversation Its broad revenue-intelligence scope may exceed basic lookup needs Predictive scoring and buying-group workflows require a defined ABM process	The Free plan includes only 50 credits Pro and Enterprise pricing requires contact-sales discussions Buyer Intent Data is an add-on for Pro users
Our verdict	6sense is a B2B revenue intelligence and sales intelligence platform for marketing and sales teams running account-based programs. Its Sales Intelligence product combines company and people search with buyer and account data acquisition,… Read the review →	This web-based B2B sales intelligence platform is designed for sales, marketing, recruiting, and revenue operations teams that need to find, verify, enrich, and export prospect data. Its published database size is 1.3B contacts, with… Read the review →

Strengths and trade-offs

• 6sense — where it wins

  • 450M-contact database with verified email and direct-dial data
  • Intent, technographic, persona, and buying-group discovery filters
  • APIs plus CRM, sales-engagement, and CSV export options

  Where it doesn't

  • Pricing requires a contact-sales conversation
  • Its broad revenue-intelligence scope may exceed basic lookup needs
  • Predictive scoring and buying-group workflows require a defined ABM process

• Seamless.AI — where it wins

  • 1.3B listed contacts with real-time search and verification
  • Direct dials, intent signals, enrichment, and job-change intelligence
  • CRM integrations, Chrome extension, and REST API access

  Where it doesn't

  • The Free plan includes only 50 credits
  • Pro and Enterprise pricing requires contact-sales discussions
  • Buyer Intent Data is an add-on for Pro users

• 66sense8.8/10 · Pricing on request

  A data-rich choice for account-based teams that need predictive buying signals.

  Visit 6senseFull verdict →
• Seamless.AI8.5/10 · Free plan

  A large-scale prospecting platform with verified contact data, intent signals, and API access.

  Visit the platformFull verdict →