Best website visitor identification software.
Knock2, RB2B, Warmly, Leadfeeder, Snitcher, Vector, and Lead Forensics, compared on person-level match rate, company-level match rate, price, and what your team can do with the result. Every competitor figure is quoted from that vendor's own public page, with the date.
Top picks for 2026
The short list first, then the full table. Knock2 is listed first because this is Knock2's comparison, not an independent award. After that, tools are ordered by what a rep can do next: person-level tools, then company-level only.
- Knock2 Person + companyThe person on 62% of US engaged sessions and the company on 93% of engaged sessions worldwide. Month-to-month from $199. See how visitor identification works or the product page.
- RB2B Person, USSelf-reports 40–45% person-level in the US. Pricing: Free at $0, Starter $79/mo, Pro from $149/mo, Pro+ from $199/mo. Sends one visitor's LinkedIn profile to Slack. Knock2 vs RB2B.
- Warmly AI chatAnnual AI chat platform from $10,000 a year. Its help center describes contact identification around 45%, without stating the denominator. Knock2 vs Warmly.
- Vector Person, ABM platformContact-level identification on ~30–35% of US website visitors (15–30% on its de-anonymization page). Priced as a whole ABM platform from $36,000 a year.
- Leadfeeder, Snitcher, and Lead Forensics Company onlyThe right pick when the question is which account showed up. The wrong pick when a rep needs a person to email.
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.
An engaged session, per Google Analytics, lasts 10 seconds or longer or has 2 or more pageviews. Results vary by traffic, geography, and industry.
How we evaluated
Four questions, with no combined score and no weights. A single grade would hide the decision that actually matters: whether the output is a person your rep can write to.
Knock2's 93% (company) and 62% (person, US traffic) are shares of engaged sessions. A vendor that says "of visitors" or "of traffic" is on a different base, and we do not convert one into the other.
Company-level names the account. Person-level names a contact: name, title, work email, phone, and LinkedIn. Knock2 does person-level on US traffic and returns the company everywhere else.
A LinkedIn profile in Slack, a chatbot on the site, and a contact routed into the CRM are different products. Workflow notes come from Knock2's published comparisons or the vendor's own page.
Month-to-month or annual, identification alone or a larger platform, and whether seats are included. Prices are copied from each vendor's pricing page on the date shown.
The 2026 comparison
Knock2 figures are the ones published on visitor identification and pricing. Competitor figures are quoted from each vendor's own pricing page and help center, with links in the table.
Swipe sideways to see every column →
| 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. | $199 to $999/month: Startup $199, Growth $499, Scale $999.Month-to-month. 7-day free trial. Annual billing 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.Pricing page lists contact-level Site ID (US only) at 15–20% on Starter and Pro, 35–45% on Pro+. Coverage bands, not engaged-session rates, so not comparable to Knock2's 62%. | 15–20% on Free, Starter, and Pro. 35–45% on Pro+.RB2B's coverage label, not an engaged-session rate, so not comparable to Knock2's 93%. | Free $0/mo: 150 resolutions, company only. Starter $79/mo: 300 resolutions, LinkedIn URLs, no emails. Pro from $149/mo: business emails, integrations. Pro+ from $199/mo: Premium Resolution.A resolution is one unique visitor per 30-day cycle (credit article). 7-day trial. |
Pushes the visitor's LinkedIn profile to Slack. No buying-committee discovery and no native email sending. |
| Warmly Comparison |
Around 45% contact identification, 50%+ with Warmly's UTM parameter.Warmly help center. Denominator not stated. | Around 60% company identification.Warmly 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 listed. | AI chat and AI agents on your site. Knock2 does not add a chatbot; reps do the outreach. |
| Leadfeeder Comparison |
Not provided. You get the company, not the person to email. | Company behind the visit, resolved from IP address.Now part of Dealfront. | Free Lite plan (last 100 companies, 7-day history). Paid: €79, €369, €599 a month billed annually; €113, €527, €599 billed monthly.Scales with identified companies and credits. Euros as published on the pricing page. | Shows which accounts showed up. A rep still has to guess who to contact. |
| Snitcher Comparison |
Treated as account-level in Knock2's comparison.The pricing page lists "Contact-level identification" with an asterisk. No person-level rate published. | Company from IP address.Less effective on home WiFi, mobile, and VPN traffic. | From $49/month for up to 50 companies, up to $529/month for 4,001–5,000.About 30% off annually. Unlimited seats. Pricing page. | Company-only data, versus contact details plus the buying committee on Knock2. |
| Vector | ~30–35% of US website visitors at the contact level.Visitor ID page. The de-anonymization page says 15–30% of traffic. Neither is an engaged-session rate. | Included with the contact match.No separate company-only rate published. | From $36,000/year; $60,000/year shown for most teams.One annual contract for the whole platform, sized by usage. Pricing page. | Named contacts inside a full ABM platform: signals, scoring, journeys, advertising, attribution. |
| Lead Forensics Comparison |
Not provided. You see the company, not the person. | Claims an industry-leading match rate; the number is not published. | 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. |
RB2B, Vector, Leadfeeder, and Snitcher prices were read from each company's pricing page on September 30, 2026. Warmly figures are from Warmly's pricing page and help center as cited in Knock2 vs Warmly, September 2026. Where Knock2 has not published a competitor figure, the cell says so. Do not read a blank as a zero.
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
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.
That is Warmly's product, on an annual contract. Knock2 does not add a chatbot. Some teams run a chat tool and Knock2 together; if you buy one, decide whether AI or your reps should hold the conversation.
Built for account-level. They do not return the person, so if the next step is an email or a call you still need a second tool.
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.
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.