
$79/mo Free tier Free trial
Why it comes up: RB2B is a person-level US visitor ID pixel, not a credit-priced agent that also sequences LinkedIn and email.
Stands out: US person-level visitor ID with a forever-free company-level rung, with HubSpot, Salesforce, Slack, Clay, and Zapier named.
Watch out: Person-level starts at Starter $79. Pro is $149 and Pro+ $199. This is US-centric; do not expect EU personal identification.
Best for
- US inbound teams who want to know which person is on the site
- HubSpot or Salesforce shops
- Clay and Instantly users turning visits into outbound
Read the RB2B write-up · Swan AI vs RB2B

€79/mo 14 day free trial MCP API
Why it comes up: Leadfeeder identifies companies on your site and hands them to the CRM, without Swan's $419 Growth agent seats.
Stands out: Unlimited users on every plan, including free Lite, with an MCP server and API access on paid plans.
Watch out: Prices are published in euros only. Discover is €113/mo on monthly billing. Emails, phones, and CRM exports spend credits.
Best for
- B2B teams that want named companies from site traffic
- RevOps pushing visitors into HubSpot, Salesforce, or Pipedrive
- Marketers building display or LinkedIn audiences
4.2 on Capterra from 135 reviews
Read the Leadfeeder write-up · Swan AI vs Leadfeeder

Sales-quoted Free tier MCP API
Why it comes up: 6sense is a quoted ABM and intent suite for enterprise buying committees, not a $100/mo GTM engineer.
Stands out: Predictive account scores plus a Sales Copilot that recommends actions, summarizes accounts and drafts messages.
Watch out: No public price. Emails, phones and exports need separate data credits, and predictive AI is a separate package.
Best for
- Enterprise sales teams prioritizing accounts with predictive scores
- GTM orgs that want intent, technographics and visitor ID together
- RevOps connecting 6sense to CRM and sales engagement tools
Read the 6sense write-up · Swan AI vs 6sense

$49/mo Free tier Free trial MCP API
Why it comes up: Apollo is a data plus sequencer stack from $49/mo with a free tier, not a visitor-ID-first credit agent.
Stands out: A large people database plus email sequences in one login, with MCP and a Chrome extension.
Watch out: Data quality varies by segment, and it does not match enterprise tools for intent data and org charts.
Best for
- Outbound recruiting and sales on one database
- Teams that want free-tier access to start
- Desks that need sequences next to the data
4.5 on Capterra from 398 reviews
Read the Apollo write-up · Swan AI vs Apollo