Knock2 vs RB2B
An independent, review-free comparison compiled by the SaaSTracker editorial team. Both products are profiled in full, and neither can pay for placement here.
The short answer
Editorial assessmentKnock2 compared with RB2B
RB2B is the free-tier baseline for US person-level identification, pushing names into Slack with minimal machinery. Knock2 costs $199 a month minimum but adds multi-graph matching, buying-committee expansion, AI scoring with a feedback loop, worldwide account-level fallback, an API, and MCP. If you want to find out whether this category works for you at zero cost, start with RB2B; if it works and you want the record scored, expanded, and routed properly, Knock2 is the upgrade path.
Choose Knock2 if
US-focused B2B sales teams that want a named person and their buying committee in Slack within seconds of the visit, teams that already own a sequencer and want a clean identification layer feeding it, and buyers who want every feature available at the entry price rather than gated behind an upper tier.
Choose RB2B if
United States focused small businesses and startups with meaningful inbound traffic who want to know which specific human is evaluating them, teams that already live in Slack and will act on an alert within minutes, and founders who want to run a warm outbound motion off their own site without buying an enterprise ABM platform.
Side by side
13 attributes| Attribute | Knock2 | RB2B |
|---|---|---|
| Category | Visitor ID | Visitor ID |
| Starting price | $199 per month (600 identified contacts) (7 days trial) | $0 (Free), then $79 per month (Starter) (free plan available) |
| Pricing model | Usage-based monthly subscription priced on identified contacts per month with an attached credit pool, month-to-month or annual, and every feature included on every tier. | Self-serve monthly subscription metered by identification resolutions, with published overage rates and a per-domain add-on. |
| Free plan | No | Free includes 150 monthly resolutions with company-level identification pushed to Slack, but no person-level identification, no email addresses, and no integrations beyond Slack. |
| Free trial | 7 days, self-serve, no sales call | 7-day full-featured trial on the Pro plan |
| Best for | US-focused B2B sales teams that want a named person and their buying committee in Slack within seconds of the visit, teams that already own a sequencer and want a clean identification layer feeding it, and buyers who want every feature available at the entry price rather than gated behind an upper tier. | United States focused small businesses and startups with meaningful inbound traffic who want to know which specific human is evaluating them, teams that already live in Slack and will act on an alert within minutes, and founders who want to run a warm outbound motion off their own site without buying an enterprise ABM platform. |
| Setup time | Under five minutes for the script, per the vendor, plus perhaps an hour writing the ICP description and the routing rules. There is no tag manager configuration or per-platform integration. | Under thirty minutes. Paste the pixel through a tag manager, connect Slack, and identifications start arriving with the next wave of traffic. The genuinely useful work is the filtering configuration afterwards. |
| Learning curve | Low. Plain-English ICP scoring removes the rule-building step that makes most competitors' configuration painful, and the routing builder keys on obvious fields. The only genuinely new concept for most buyers is buying-committee expansion, which changes how you think about a visit. | Very low as software, moderate as a process. The tool is a feed; the skill is deciding what to do with a name and how quickly. Teams that treat identifications as a to-do list rather than a curiosity feed get value, and the rest churn. |
| Platforms | Web application, JavaScript tracking script, REST API, MCP endpoint, Webhooks | JavaScript pixel for any website, Web application, Slack and Microsoft Teams apps, Webhooks |
| Compliance | GDPR (account-level only for EU visitors), CCPA, ePrivacy Directive (vendor-stated) | SOC 2 Type II, CCPA and CPRA compliant with a public individual opt-out |
| Founded | 2023 | 2023 |
| Headquarters | New York, New York, United States | Austin, Texas, United States |
| Ownership | Privately held, founder-led | Bootstrapped |
Strengths and limitations
Knock2
Strengths
- Publishes match rates with a stated denominator (93 percent account-level and 62 percent person-level on engaged US sessions defined as ten seconds or two pageviews), which is more methodological honesty than this category usually offers.
- Device-level matching across several consented identity graphs rather than reselling one provider, which is a genuine architectural reason for higher resolution.
- Every feature on every tier: API, MCP, webhooks, all CRM and outbound connectors, buying-committee expansion, and AI scoring are available on the $199 plan.
- Buying-committee expansion is the most useful feature here, because one anonymous researcher is rarely the buyer and three to five named influencers is an account plan.
Limitations
- Person-level identification is US-only, which makes the headline capability irrelevant for European, UK, and most international sales motions.
- The 93 percent claim is measured against engaged sessions rather than total traffic, so the number that appears on your invoice per thousand raw sessions will look much less impressive than the marketing figure.
- No opt-out workflow or data broker registration is published, which will stall a serious privacy review.
- No built-in sequencer or sending infrastructure, so you need a separate outbound tool; whether that is a limitation or a virtue depends on your stack.
RB2B
Strengths
- Person-level identification with a name and a LinkedIn profile, which is categorically more actionable than the company-level identification every other tool at this price provides.
- Real-time Slack delivery, often while the visitor is still on the site, which turns a signal into a same-hour conversation rather than a weekly report.
- Pricing that a small business can actually buy: free to start, $79 to $199 a month, month to month, no implementation fee, and published overage rates.
- Bootstrapped and profitable with no investor timeline forcing a move upmarket, which is a genuine stability argument in a category where funded competitors get acquired and shut down.
Limitations
- Person-level identification is United States only, with IP ringfencing preventing overseas resolution, which rules the product out for most European and Asia-Pacific focused businesses.
- Match rates are a share of traffic, not all of it, and that share varies enormously by audience, so the same plan delivers wildly different value to two different companies.
- The product ends at the identification. There is no intent scoring model, no account research, no sequencing, and no sending; you supply everything downstream.
- It generates a stream of false positives by construction: job seekers, competitors, existing customers, and analysts all trigger identifications and consume resolutions.
Pricing compared
Knock2
Usage-based monthly subscription priced on identified contacts per month with an attached credit pool, month-to-month or annual, and every feature included on every tier.
- Startup$199
- Pro$349
- Growth$499
- Growth Plus$749
- Scale$999
Per identified contact Knock2 is mid-market: more expensive than Happierleads at entry, far more expensive than RB2B's free tier, and comparable to Leadpipe once you account for what each returns. What you are paying the premium for is match rate and structure. If the 62 percent person-level figure holds anywhere near true on your US traffic, the effective cost per usable contact is lower than a cheaper tool with a thinner graph, because you are not paying for sessions that never resolve. The ungated feature set compounds that: a $199 subscription with API, MCP, buying-committee expansion, and every CRM connector is more product than several competitors sell at three times the price. The value case collapses if your traffic is not predominantly US, at which point you are buying an account-level tool at person-level prices.
RB2B
Self-serve monthly subscription metered by identification resolutions, with published overage rates and a per-domain add-on.
- Free$0
- Starter$79
- Pro$149
- Pro Plus$199
For a United States focused business, RB2B is the highest-leverage $149 in this category. Person-level identification with a business email address, pushed to Slack in real time, is a capability that ABM platforms charge tens of thousands a year for, and RB2B sells it month to month with a published overage rate. The value depends entirely on two variables you can measure in a week: how much of your traffic is American, and what share of it resolves. If both numbers are good, nothing else here competes on capability per dollar. If your traffic is European, the product degrades to company-level identification and cheaper alternatives do that job just as well.
Editorial verdict on each
Knock2
Knock2 is the best-structured product in the US person-level end of this category, and the structure is the reason to buy it. Every feature on every tier, month-to-month billing, an API and an MCP endpoint at $199, match rates published with an actual denominator, and buying-committee expansion that turns a single anonymous reader into a workable account. If your traffic is predominantly US and you already own a sequencer, this is the identification layer to try first, and the seven-day trial will tell you within a week whether the economics work on your site. If you sell into Europe, the headline capability is switched off and you should be looking at Snitcher or Leadinfo. And understand what you are buying either way: the people Knock2 names consented to a publisher, not to you, and the vendor has not published how a visitor opts out.
Read the full Knock2 profileRB2B
MomentumRB2B is the cheapest way to find out which specific human is on your website, and for a United States focused small business that is a genuinely unfair advantage for $149 a month. The pixel takes minutes, the alert lands in Slack while the person is still reading, and the pricing is month to month with published overage instead of an annual ABM contract. Two things decide whether it works for you, and both are measurable in a week: how American your traffic is, and how much of it resolves. Run the free tier, then the seven-day Pro trial, and look at the actual match rate before you commit. If your buyers are European, walk away and buy a company-level tool built for that market. And whatever your geography, understand that RB2B hands you a name and stops; the scoring, the judgement, and the message are still your job.
Read the full RB2B profileKnock2 profile last reviewed 2026-08-22; RB2B last reviewed 2026-08-22. Pricing is compiled from public sources and can change without notice. See our methodology.