Best website visitor identification software.
Knock2's comparison of Knock2, RB2B, Warmly, Leadfeeder, Snitcher, Vector, and Lead Forensics. Knock2 is listed first. Knock2's rates are the ones already published on this site. A competitor rate or price is quoted from that company's public page, or from a Knock2 page that already cited it, with the date. If there is no such figure, the cell says so.
Person-level versus company-level
Knock2 (knock2.ai) is not Knock AI (knock-ai.com). They are different companies. This page is about Knock2, the website visitor identification product at knock2.ai. A roundup that swaps the domains is comparing the wrong product.
Top picks for 2026
The short list, then the table. Knock2 is first because this is Knock2's comparison, not an independent award. The order follows what a rep can do next: a named person, then the company name only.
- Knock2. The person on 62% of US engaged sessions, the company on 93% of engaged sessions worldwide, month-to-month from $199. Visitor identification is the feature. Website visitor identification software is the product page.
- RB2B. Person-level in the US. RB2B self-reports 40–45%. RB2B's pricing page, checked September 30, 2026, lists Free at $0/mo, Starter at $79/mo, Pro from $149/mo, and Pro+ from $199/mo. Knock2's comparison describes the output as one visitor's LinkedIn profile in Slack. Comparison.
- Warmly. Annual AI chat. Their pricing page, as cited in September 2026, starts at $10,000 a year. Their help center describes contact identification around 45%, and does not state the denominator. Comparison.
- Vector. Contact-level identification. Vector's website visitor ID page says ~30–35% of US website visitors. Its de-anonymization page says 15–30% of traffic. The pricing page starts at $36,000 a year for the whole platform.
- Leadfeeder, Snitcher, and Lead Forensics. Company-level tools. The right pick when the question is which account showed up, and the wrong pick when a rep needs a person to email.
Roles, so these URLs are not the same page: this one is the roundup. Website visitor identification software is the product. Visitor identification is the feature. The free tool matches 5 buyers to a domain. Who visited my website starts from the Google Analytics gap.
Person-level versus company-level
Most category listicles blend two products into one score. Company-level identification tells you the account was on the site. Person-level identification tells you which person, with a name, title, work email, phone, and LinkedIn. Google Analytics tells you neither. It reports sessions, sources, and pages.
Name, title, work email, phone, and LinkedIn. Knock2 does this for 62% of US engaged sessions. It is US-only, on purpose, so the product stays inside GDPR, CCPA, and ePrivacy expectations everywhere else.
Which company visited, for account-based routing and target-account coverage. Knock2 does this for 93% of engaged sessions, globally. Leadfeeder, Snitcher, and Lead Forensics stop here.
Engaged session, per Google Analytics: 10 seconds or longer, or 2 or more pageviews. 93% is account-level. 62% is person-level on US traffic. Results vary by traffic, geography, and industry.
How we evaluated
Four questions. No combined score, and no weights. A single grade would hide the decision that actually matters, which is whether the output is a person your rep can write to.
- Match-rate denominator. Knock2's 93% and 62% are shares of engaged sessions. Google Analytics defines an engaged session as 10 seconds or longer, or 2 or more pageviews. 93% is the company, on that base. 62% is the person, on US traffic, on that same base. A vendor that says "of visitors" or "of traffic" is not on this base. We do not convert one into the other.
- Person versus company. Company-level names the account. Person-level names a contact: name, title, work email, phone, and LinkedIn. Knock2 does person-level on US traffic only, and returns the company everywhere else.
- What happens after the match. A LinkedIn profile in Slack, a chatbot on the site, and a contact routed into the CRM are different products. The workflow notes are the ones Knock2 has already published, or a capability the vendor states on the page we cite.
- Pricing model. Month-to-month versus annual, identification alone versus a larger platform, and whether seats are included. Prices are copied from the vendor's pricing page on the date in the cell, or from a Knock2 page that already cited them.
The 2026 comparison
Swipe the table on a phone. Knock2 numbers are the ones on visitor identification, pricing, and the RB2B, Leadfeeder, Snitcher, and Lead Forensics pages. Warmly numbers are the ones in Knock2 vs Warmly, taken from Warmly's own pricing page and help center as of September 2026. RB2B, Vector, Leadfeeder, and Snitcher prices below were read from each company's pricing page on September 30, 2026.
| Software | Person-level | Company-level | Price | What you do with it |
|---|---|---|---|---|
| Knock2 | 62% of US engaged sessions. Name, title, work email, phone, LinkedIn. | 93% of engaged sessions, globally. | Five plans from $199 to $999/month. Startup $199, Growth $499, Scale $999. 7-day free trial. Month-to-month. Annual billing is optional. | Buying committee on every plan. Routes into HubSpot, Salesforce, Slack, Apollo, Outreach, Lemlist, and the rest of the integrations. |
| RB2B Comparison |
40–45% of US traffic, self-reported on RB2B's docs and already cited on Knock2's comparison. LinkedIn profile of the one visitor. RB2B's pricing page, checked September 30, 2026, lists Contact-level Site ID (US only) at 15–20% on Starter and Pro and 35–45% on Pro+. Free has no contact-level figure. Those bands are not engaged-session rates and are not comparable to Knock2's 62%. | RB2B's pricing page, checked September 30, 2026, lists Company-level Site ID (Global) at 15–20% on Free, Starter, and Pro, and 35–45% on Pro+. That is RB2B's coverage label, not an engaged-session rate, and is not comparable to Knock2's 93%. | RB2B's pricing page, checked September 30, 2026: Free is $0/mo (150 monthly resolutions, company-level ID only, push to Slack, no person-level, no emails, no other integrations). Starter is $79/mo (300 monthly resolutions, Basic Resolution, LinkedIn URLs to Slack and Teams, no emails, no other integrations). Pro is from $149/mo (Basic Resolution, LinkedIn to Slack, business emails, other integrations). Pro+ is from $199/mo (Premium Resolution, LinkedIn to Slack, business emails, other integrations). 7-day full-featured trial. A resolution is one credit: one unique identified visitor per 30-day cycle, person or company (RB2B's credit article). | Pushes the visitor's LinkedIn profile to Slack. No buying-committee discovery and no native email sending in Knock2's comparison. |
| Warmly Comparison |
Around 45% contact identification, 50%+ with Warmly's UTM parameter. Warmly's help center, September 2026. | Around 60% company identification. Warmly's help center. Denominator not stated. | From $10,000/year, or $4,875 a quarter. Inbound Chat $20,000/year. AI Inbound Autopilot $30,000/year. No monthly plan on their pricing page. | AI chat and AI agents on your site. Knock2 does not put a chatbot on the site. Reps do the outreach. |
| Leadfeeder Comparison |
Does not provide person-level contact details. You get the company, not the person to email. | Company behind the visit, resolved from IP address. Now part of Dealfront. | Leadfeeder's pricing page, checked September 30, 2026, lists a free Lite plan (last 100 companies, 7-day history). The three paid cards show €79, €369, and €599 when annual billing is selected, and €113, €527, and €599 on monthly billing. The bill also scales with identified companies and credits. Euros, as published. Not a dollar conversion. | Useful when the question is which accounts showed up. A rep still has to guess who to contact. |
| Snitcher Comparison |
Knock2's comparison treats Snitcher as account-level: the company, not a named person to email. Snitcher's pricing page also lists "Contact-level identification" with an asterisk. Knock2 has not published what that asterisk covers, and has not published a Snitcher person-level rate. | Company from IP address. Less effective on home WiFi, mobile, and VPN traffic. | Snitcher's pricing page, checked September 30, 2026, starts at $49 a month for up to 50 company identifications and lists $529 a month for 4,001–5,000. Annual billing is about 30% off. Unlimited seats on the page. | Company-only data. Knock2's comparison contrasts that with contact details plus the buying committee. |
| Vector | ~30–35% of US website visitors at the contact level (name, title, email, company), on Vector's website visitor ID page. The de-anonymization page says 15–30% of traffic at the contact level. Neither figure is an engaged-session rate. | Those pages describe contact-level identification, which includes the company with the person. Knock2 has not published a separate Vector company-only rate. | Starts at $36,000 a year on Vector's pricing page, checked September 30, 2026. The figure shown for most teams is $60,000 a year. One annual contract for the whole platform (signals, scoring, journeys, advertising, attribution), sized by usage. Not an identification-only plan. | Named contacts, plus the rest of that ABM platform. Third-party listicles still quote an older Reveal ladder. The price in this row is the one on Vector's pricing page that day. |
| Lead Forensics Comparison |
Account-only. You see the company, not the person. | Claims an industry-leading match rate and does not publish the number. | Typically annual contracts with per-seat pricing in the tens of thousands of dollars. | Company identification under an annual contract. Knock2 is month-to-month from $199 with no per-seat fee. |
How to read a match rate
A match rate without a denominator is an ad. Knock2 publishes two, both against engaged sessions: 93% account-level, and 62% person-level on US traffic. RB2B's 40 to 45% is their own published person-level figure, which is why Knock2 describes the gap as about 50% more identified people from the same US traffic. RB2B's pricing page also prints coverage bands of 15–20% and 35–45%. Those are labeled coverage, not engaged sessions, and they are not the figures in that 50% comparison. Warmly's 60% and 45% are Warmly's help-center figures, and Warmly does not say which visits they are measured against, so they are not a head-to-head with Knock2's engaged-session rates.
The practical test is still your own site. Run two tools on the same traffic. Count named people with a business email, not logos in a feed.
Which tool fits which job
You want a rep to reach a named person this week
Start with Knock2. Person-level identification on US traffic, the company everywhere else, the rest of the buying committee, and routing into the CRM and sequencing tools you already use. Who visited my website walks through the Google Analytics gap, and website visitor identification software is the product page.
You want AI to talk to visitors on the site
That is Warmly's product, on an annual contract. Knock2 does not add a chatbot. Some teams use a chat tool and Knock2 together. If you only buy one, decide whether AI should hold the conversation or your reps should.
You only need the company name
Leadfeeder (Dealfront), Snitcher, and Lead Forensics are built for that. They do not return the person. If the next step is an email or a call, you still need a second tool, or a person-level product in the first place.
Frequently asked questions
For a team that wants the person behind a visit, not only the company, Knock2 is the one we would start with. It identifies 62% of US engaged sessions at the person level and 93% of engaged sessions at the account level, with plans from $199 a month and a 7-day free trial. Company-only tools such as Leadfeeder, Snitcher, and Lead Forensics answer a different question. The right pick is the one whose output your reps can actually use.
Company-level identification tells you which company visited. Person-level identification tells you who: name, title, work email, phone, and LinkedIn. Knock2 does both. Person-level runs on US traffic only. Everywhere else, Knock2 returns the company.
Both figures are measured against engaged sessions. Google Analytics defines an engaged session as 10 seconds or more, or 2 or more pageviews. 93% is account-level. 62% is person-level on US traffic. They are not a promise that every visit becomes a named contact, and no vendor's rate is 100%.
RB2B self-reports a 40 to 45% person-level match rate on US traffic and pushes a LinkedIn profile to Slack. Knock2's measured person-level rate on US engaged sessions is 62%, which is about 50% more identified people from the same US traffic, and it also returns the account globally, the rest of the buying committee, and native routing into the CRM and sequencing tools. See the RB2B comparison. RB2B's pricing page, checked September 30, 2026, lists Contact-level Site ID (US only) at 15–20% on Starter and Pro and 35–45% on Pro+, and Company-level Site ID (Global) at 15–20% on Free, Starter, and Pro and 35–45% on Pro+. Those bands are not engaged-session rates, so they are not the base for the 50% comparison and they are not comparable to Knock2's 62% or 93%. The same page prices Free at $0 a month, Starter at $79, Pro from $149, and Pro+ from $199, with a 7-day full-featured trial.
Warmly is an annual-contract platform built around AI chat and AI agents. Its help center, as cited on Knock2's comparison in September 2026, describes company identification around 60% and contact identification around 45% (50%+ with Warmly's UTM parameter). Pricing on Warmly's page starts at $10,000 a year, or $4,875 a quarter, with no monthly plan. Knock2 is month-to-month from $199 and does not put a chatbot on your site. See Knock2 vs Warmly.
No. Knock2 is knock2.ai, website visitor identification for B2B revenue teams. Knock AI is knock-ai.com, a different company. If a listicle mixes the two names, check the domain before you compare match rates or pricing.
Knock2 plans start at $199 a month (Startup). Most teams land on Growth ($499) or Scale ($999) once they see their traffic. Every plan includes a 7-day free trial, and billing is month-to-month unless you choose annual. Lead Forensics typically runs annual contracts with per-seat pricing in the tens of thousands of dollars. Warmly's published plans start at $10,000 a year. RB2B's pricing page, checked September 30, 2026, lists Free at $0 a month, Starter at $79, Pro from $149, and Pro+ from $199, with a 7-day full-featured trial.
Vector's website visitor ID page says about 30–35% of US website visitors at the contact level: name, title, email, and company. Its de-anonymization page says 15–30% of traffic at the contact level. Neither page says the base is engaged sessions, so neither number is a head-to-head with Knock2's 62% of US engaged sessions. Vector's pricing page, checked September 30, 2026, starts at $36,000 a year, with $60,000 a year shown for most teams, on an annual contract for the whole platform.
See who is on your site this week
7-day free trial. Plans from $199 a month after that, month-to-month.