RB2B vs. Warmly (vs. ZoomInfo): Comprehensive Comparison [2026]

Choosing between RB2B and Warmly for identifying anonymous website visitors comes down to five questions:

• Do you need to know who's on your website, or do you also need to act on that data automatically?

• Is your target market the United States, or do you sell internationally?

• Are you looking for a lightweight tool, or a platform that runs outbound sequences, AI chat, and CRM enrichment in one place?

• How important is it that your visitor data connects to verified direct dials, business emails, and org charts?

• Do you want a single-purpose tool for website traffic, or a platform that powers your entire go-to-market operation?

In short, here's what we recommend:

RB2B serves U.S.-focused B2B sales teams that want the simplest path to person-level website visitor identification. Drop a script on your site, connect Slack, and start seeing LinkedIn profiles and job titles for individual visitors within minutes. RB2B identifies 30-40% of U.S. traffic at the person level on its Pro+ plan, with a free tier offering 150 monthly company-level resolutions. However, person-level identification is U.S. only, the free plan no longer includes contact-level data, and the platform has no built-in outreach or engagement tools.

Warmly combines visitor de-anonymization with AI-powered orchestration. It identifies up to 65% of visiting companies and up to 15% of individual contacts, then adds AI chatbots, automated email and LinkedIn sequences, and real-time Slack alerts to engage prospects while they're still on your site. For teams that want identification and automated follow-up in one platform, Warmly consolidates several tools. The trade-off is price: paid plans start at $15,000 per year, putting it out of reach for smaller teams, and its person-level identification accuracy can be inconsistent.

Both platforms help you see who visits your website. But visitor identification is one signal among many, and acting on it requires verified contact data, buying intent context, and a way to reach the right people. That's where a complete intelligence platform changes the equation.

ZoomInfo is an AI GTM platform built on a data foundation of 500M contacts, 100M companies, 135M+ verified phone numbers, and 200M+ verified business emails. Its GTM Context Graph processes 1.5B+ data points daily, unifying this data with your CRM records, conversation transcripts, and behavioral signals to reveal the full context of your accounts. That context shows not just what happened, but why it happened, and which actions will capitalize on that momentum. Website visitor tracking (WebSights) is one of dozens of signal types feeding this platform, alongside buyer intent data, technographics, org charts, and job change alerts. Your team accesses it all through GTM Workspace for sellers, GTM Studio for marketers and RevOps, or API and MCP in any tool.

If you want visitor identification as part of a complete go-to-market intelligence platform, see how ZoomInfo works.

RB2B vs. Warmly vs. ZoomInfo at a glance

Website visitor identification is just the starting point

RB2B and Warmly solve the same initial problem: most B2B website visitors leave without filling out a form, and both tools reveal who those visitors are. The difference is what happens after identification.

RB2B keeps it simple. It identifies visitors and pushes that data to Slack, your CRM, or tools like Clay and Apollo. What you do with the information is up to you.

This approach works well for teams that already have outreach workflows and just need identity data to feed them. The 5-minute setup and free tier make it easy to test whether visitor identification delivers value before spending anything.

Warmly automates what comes next. When a high-intent visitor lands on your pricing page, Warmly can alert your sales rep in Slack, deploy an AI chatbot to engage the visitor, and enroll the contact in an automated email sequence, all at once.

This approach consolidates what would otherwise require separate tools for chat, sequencing, and intent tracking.

ZoomInfo treats website visitor tracking as one input among many. WebSights identifies companies visiting your site and connects them to ZoomInfo's verified contact database, but that's one of the signals feeding the GTM Context Graph, which processes 1.5B+ data points daily.

The value is in the layered intelligence: the visitor comes from a company that's also researching your competitor (intent data), just hired a new VP of Engineering (job change signal), and uses a technology your product integrates with (technographics). Those combined signals, not just the website visit, tell you whether and how to engage.

Person-level identification has different ceilings

All three platforms offer person-level identification, but the mechanics and coverage differ.

RB2B built its reputation on person-level identification and claims the highest match rates for U.S. traffic. On its Pro+ plan, RB2B identifies 35-45% of U.S. visitors at the contact level, returning LinkedIn profiles, job titles, and business emails.

The Demandbase partnership adds company-level identification globally, bringing total resolution to 70-80% of traffic. However, the free and Starter plans only achieve 10-20% person-level coverage, and users have reported data accuracy issues with some profiles.

Source: RB2B

Warmly identifies up to 65% of visiting companies and up to 15% of individual contacts, using a multi-vendor data waterfall that cross-references signals from multiple enrichment providers.

Source: Warmly

The company-level match rate is competitive, but the person-level rate is lower than RB2B's premium tiers. Warmly compensates by layering AI chat and automated outreach on top of whatever contacts it identifies, extracting more value from each match.

ZoomInfo approaches the problem differently. Rather than optimizing for website visitor match rates alone, ZoomInfo connects identified companies to its database of 500M contacts with 135M+ verified phone numbers and 200M+ verified business emails.

When WebSights identifies a company on your site, you have access to verified direct dials and emails for the entire buying committee at that organization, not just the one person who happened to visit. Contact-level site visitor identification pinpoints specific individuals, while the broader database fills in the rest of the decision-making team.

The difference matters most when you're selling to organizations, not individuals. Knowing that one marketing manager visited your pricing page is useful. Knowing the full org chart (the VP who controls the budget, the IT director who'll evaluate the integration, and the CFO who'll sign off) gives your sales team something to work with.

Intent signals go beyond page views

RB2B and Warmly track what visitors do on your website. ZoomInfo tracks what they do everywhere else, too.

RB2B's intent signal is page-level tracking. Hot Pages lets you tag high-value URLs (pricing, case studies, demo pages) and flag visitors who view them.

Source: RB2B

Hot Leads adds ICP filtering so you only see visitors matching criteria like company size, revenue, seniority, and department. It works for understanding on-site behavior, but it can't tell you what prospects are researching off your website.

Source: RB2B

Warmly adds depth with its multi-layered intent system, combining first-party website behavior with second-party signals (LinkedIn job changes, funding rounds) and third-party intent data from providers like Bombora. The ML-powered scoring gives each account a score from 0-100, offering more nuance than page-view tracking. Showing exactly which signals contributed to a score helps sales reps trust the data.

Source: Warmly

ZoomInfo's buyer intent data operates at a different scale. Drawing from 210 million IP-to-Organization pairings and 6 trillion+ new keyword-to-device pairings sourced monthly, it detects when companies are researching topics relevant to your product across the broader web, not just your site.

Guided Intent, exclusive to ZoomInfo, identifies the intent topics historically correlated with your closed-won deals, removing the guesswork of manual topic selection.

Combined with technographics tracking 30,000+ technologies across 200+ categories, job change alerts, and company news, ZoomInfo provides a view of buying activity that website-only tools cannot match.

Outreach and engagement capabilities

This is where the platforms diverge most sharply.

RB2B has no built-in outreach tools. It identifies visitors and hands off the data through integrations with Slack, HubSpot, Salesforce, Clay, Apollo, Zapier, and others, but the actual engagement (emails, calls, LinkedIn messages) happens elsewhere.

Source: RB2B

For teams with established outreach workflows, this is fine. For teams building from scratch, it means buying and configuring additional tools.

Warmly fills the engagement gap with several built-in tools. AI Chat identifies visitors before they engage and opens personalized conversations based on their company, role, and the pages they're viewing. Reps get real-time Slack alerts and can jump into a text chat or escalate to a live video call on the website.

Source: Warmly

The Orchestrator automates email and LinkedIn outreach sequences, enrolling prospects based on intent signals without manual intervention.

Source: Warmly

For teams wanting to consolidate chat, sequencing, and visitor identification into one vendor, Warmly delivers.

ZoomInfo provides engagement across every channel. GTM Workspace gives sellers AI-generated outreach drafted from full account context (CRM history, conversation transcripts, intent signals, and company intelligence) so the email addresses the specific concern the prospect raised on their last call, not a generic template.

ZoomInfo Chat identifies visiting companies and routes conversations based on company attributes and intent signals.

GTM Studio lets marketers and RevOps teams build multi-channel plays (email, display ads, direct mail, calls) triggered by buyer behavior, launchable in minutes without engineering support.

Chorus captures every customer call and meeting, feeding intelligence back into the GTM Context Graph so the next outreach reflects what actually happened in previous conversations.

The data foundation underneath matters

Visitor identification tools are only as good as the data they match against. This is the structural difference between point solutions and a platform built on B2B data.

RB2B maintains its own proprietary database for person-level identification, limited to U.S. contacts matched to U.S. home addresses. The Demandbase partnership extends company-level coverage globally, but person-level data remains U.S. only. RB2B doesn't offer a standalone contact database, so you can't search for contacts at companies that haven't visited your website.

Warmly aggregates data from 10+ enrichment providers through a multi-vendor waterfall. This gives it breadth, but accuracy depends on whichever third-party provider matches first, and users have noted inconsistencies in contact enrichment.

Source: Warmly

Warmly's strength is in unifying these data sources with behavioral signals, not in the depth of any single data layer.

ZoomInfo's data is its core product, built and verified over nearly two decades: 500M contacts, 100M companies, 135M+ verified phone numbers, 120M direct-dial phone numbers, and 200M+ verified business emails. Verification runs through automated ML scanning 28 million site domains daily and 300+ human researchers. First-party data reaches up to 95% accuracy.

In a Fortune 500 competitive RFP analyzing 25 million contacts across vendors, the independent consultant concluded that "no other competitor came even close."

Analyst firms have validated this: ZoomInfo is a Leader in the Forrester Wave for Intent Data Providers (Q1 2025), a Leader in the Gartner Magic Quadrant for ABM Platforms (2024 and 2025), and holds 133 No. 1 rankings on G2.

For sales teams, the practical impact is that a ZoomInfo direct dial actually rings and a ZoomInfo email actually lands. For RevOps teams, enrichment workflows don't require stitching together multiple vendors to get a complete account picture.

Pricing reflects different scopes

The pricing structures reveal what each platform does and who it's built for.

RB2B is the most accessible entry point. The free plan offers 150 company-level resolutions per month (though it no longer includes contact-level data).

The Starter plan costs $79/month for 300 credits with LinkedIn URLs pushed to Slack but no email addresses. The Pro plan starts at $149/month for 600 credits with business emails and full integrations. The Pro+ plan starts at $199/month with 35-45% coverage. Overage charges run 25-45 cents per resolution depending on tier. All paid plans are month-to-month with no contracts required.

Warmly jumps to enterprise pricing. The TAM plan starts at $15,000 per year for outbound intelligence and orchestration. The Inbound plan starts at $30,000 per year for on-site conversion and AI chat. The Full GTM plan requires custom pricing. Add-ons like AI Outbound SDR and AI Inbound Lead Caller cost extra. Annual contracts appear to be standard.

There is no free tier or trial; prospective users must book a demo.

ZoomInfo uses custom-quoted, seat-and-credit-based pricing with no published prices. However, it offers two free entry points: ZoomInfo Lite (a permanent free tier with 10 monthly export credits and access to the B2B database) and a 7-day free trial of the full platform.

Paid plans scale across Sales, Marketing, and Operations product lines, each with Professional, Advanced, and Enterprise tiers. Annual contracts are standard.

Customers like Seismic report 54% productivity gains and 11.5 hours saved per week per seller, and Snowflake achieved 200% higher conversion rates on top-scoring accounts.

The right comparison depends on what you're replacing.

RB2B's $79-199/month buys visitor identification only.

Warmly's $15,000-30,000/year buys identification plus orchestration, replacing separate chat and sequencing tools.

ZoomInfo's custom pricing buys a complete intelligence platform, often replacing a contact data provider, an intent data vendor, a conversation intelligence tool, and a marketing orchestration platform at once.

Setup and time to value

RB2B wins on simplicity. The 5-minute setup involves installing a tracking script, connecting Slack, and optionally linking your CRM. Installation guides cover 14 CMS platforms including WordPress, Webflow, and Wix. A built-in script test tool confirms everything works. The 7-day Pro trial requires no credit card, so you can validate the platform within a week.

One agency CEO reported booking meetings within 15 minutes of installation.

Warmly also deploys fast. Basic setup (script installation, CRM connection, Slack integration) takes hours. The learning curve steepens when configuring AI playbooks, automated outreach sequences, and multi-channel orchestration.

Getting good results requires experimenting with ICP scoring models and AI chat prompts to match your sales motion.

ZoomInfo requires more deliberate onboarding, reflecting its broader scope. The company redesigned onboarding to span 30-90 days across planning, technical implementation, education, and adoption phases. That investment produced a 25% improvement in customer satisfaction scores.

ZoomInfo University provides role-specific learning paths and certifications. GTM Workspace deploys in weeks, not months, and once running, the platform grows more valuable as the GTM Context Graph learns from your team's interactions.

International coverage

If your target market extends beyond the United States, this comparison gets simple.

RB2B's person-level identification is U.S. only. The Demandbase partnership provides global company-level identification, but if you need to identify specific individuals visiting from Europe, Asia, or anywhere outside the U.S., RB2B cannot help.

Warmly's person-level identification is also primarily accurate for U.S.-based visitors. International coverage is a commonly requested improvement, and the company is investing in its European presence, but coverage outside North America remains limited.

ZoomInfo operates globally with 34M+ company profiles outside North America, 200M+ professional profiles outside NA, and 45M+ mobile numbers outside NA. In 2025 alone, ZoomInfo expanded international mobile coverage by 1.8 million numbers across six European markets. For companies selling internationally, ZoomInfo is the only option among these three with global person-level data.

Security and compliance

All three platforms maintain SOC 2 compliance and data encryption, but the depth varies.

RB2B holds SOC 2 Type II certification and is CCPA compliant. Because its person-level database is U.S. only, GDPR is largely sidestepped for its core product. The tracking script is served over HTTPS from Amazon CloudFront with DDoS mitigation.

Warmly has achieved SOC 2 Type 1 certification and complies with GDPR, CCPA, and the EU Data Act. It conducts regular penetration testing and offers data deletion controls and OAuth scope management for administrators.

ZoomInfo maintains the broadest compliance stack: ISO 27001, ISO 27701, SOC 2 Type II, TRUSTe GDPR, and TRUSTe CCPA certifications, all renewed annually. ZoomInfo is a registered data broker in California and Vermont. For enterprises in regulated industries (financial services, healthcare, government), ZoomInfo's compliance infrastructure is a prerequisite.

RB2B vs. Warmly vs. ZoomInfo: Which should you choose?

The choice depends on where you are in building your go-to-market operation and what you need visitor identification to accomplish.

Choose RB2B if:

• You want the simplest, fastest path to seeing who visits your U.S.-focused website

• You already have outreach tools and just need identity data to feed them

• Budget is tight and you want to start free or at $79/month

• Your sales team is small and can manually follow up on identified visitors

• Speed to value matters more than feature depth

Choose Warmly if:

• You want visitor identification and automated outreach in one platform

• AI-powered chat that engages visitors in real time fits your sales motion

• You're willing to invest $15,000+/year for orchestration

• Your team is ready to configure AI playbooks and automated sequences

• You want to consolidate your chat, intent, and sequencing tools

Choose ZoomInfo if:

• Website visitor identification is just one part of what you need

• Verified contact data (direct dials, business emails, org charts) across your full TAM matters

• You sell internationally and need global person-level coverage

• Your go-to-market strategy requires intent data, conversation intelligence, and multi-channel orchestration

• You want a platform that grows more valuable as your team uses it

Start with ZoomInfo Lite for free or request a demo of the full platform.

RB2B and Warmly both solve a real problem: the majority of website visitors leave without identifying themselves. But for most B2B organizations, knowing who visited is only the beginning. The companies that convert that knowledge into pipeline connect website signals to verified contacts, buying intent, org charts, and coordinated outreach across every channel. That's the gap between visitor identification and go-to-market intelligence, and it's the reason 35,000+ companies run their revenue operations on ZoomInfo.

RB2B vs. Warmly vs. ZoomInfo FAQ

What is the core difference between RB2B, Warmly, and ZoomInfo?

RB2B is a website visitor identification tool that reveals who visits your site at the person level, focused on U.S. traffic.

Warmly combines visitor identification with AI-powered engagement tools like chatbots, automated email sequences, and LinkedIn outreach.

ZoomInfo is an AI GTM platform with 500M contacts, buyer intent data, conversation intelligence, and multi-channel orchestration, where website visitor tracking is one of many signal types.

Which platform has the best website visitor match rate?

RB2B claims the highest person-level match rates, identifying 35-45% of U.S. visitors on its Pro+ plan.

Warmly identifies up to 65% of companies and up to 15% of individuals.

ZoomInfo takes a different approach, connecting identified companies to its verified database of 500M contacts, giving you access to the full buying committee rather than just the individual who visited.

Can any of these platforms identify visitors outside the United States?

RB2B's person-level identification is U.S. only, with global company-level identification via its Demandbase partnership.

Warmly's person-level accuracy is primarily limited to the U.S. as well.

ZoomInfo has global data with 34M+ company profiles and 200M+ professional profiles outside North America, plus 45M+ international mobile numbers.

Which platform is the most affordable for small teams?

RB2B is the cheapest entry point with a free plan offering 150 company-level resolutions per month and paid plans starting at $79/month.

ZoomInfo Lite offers a permanent free tier with 10 monthly export credits and access to the B2B database.

Warmly has no free option and starts at $15,000 per year.

Do any of these platforms include built-in outreach or engagement tools?

RB2B does not include outreach tools and relies on integrations with Slack, CRMs, and platforms like Clay and Apollo.

Warmly includes AI chatbots, automated email sequencing, and LinkedIn outreach.

ZoomInfo includes AI-powered outreach through GTM Workspace, website chat, conversation intelligence via Chorus, and multi-channel campaign orchestration through GTM Studio.

How does buyer intent data compare across the three platforms?

RB2B tracks on-site behavior only, flagging visitors who view specific pages like pricing or case studies.

Warmly aggregates first-party, second-party, and third-party intent data with an ML-scored system.

ZoomInfo tracks intent from 210 million IP-to-Organization pairings and 6 trillion-plus keyword-to-device pairings monthly, with a Guided Intent feature that identifies topics correlated with closed-won deals.

Which platform is best for enterprise organizations?

ZoomInfo is the strongest fit for enterprise organizations, serving 35,000+ companies worldwide including Adobe, Snowflake, PayPal, and JPMorgan. It offers the broadest compliance certifications (ISO 27001, ISO 27701, SOC 2 Type II), the largest integration ecosystem (120+ integrations), and enterprise-grade access through API and MCP for custom applications and AI agents.

Warmly serves mid-market and some enterprise customers.

RB2B suits SMBs and growth-stage companies best.

Can I use more than one of these platforms together?

Yes. RB2B and Warmly focus on website visitor identification and engagement, while ZoomInfo provides the underlying data infrastructure. Some teams use RB2B or Warmly for real-time visitor alerts alongside ZoomInfo for contact data, intent signals, and prospecting beyond website traffic. ZoomInfo's API and MCP make it straightforward to feed its intelligence into other tools in your stack.