Knock2 vs Lead Onion
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
Both sides assessedKnock2 compared with Lead Onion
Lead Onion leads with multi-source third-party intent across 20-plus providers and layers website visitors on top, from $500 a month with contact reveal credits. Knock2 leads with your own traffic and does not sell market-wide intent at all. Take Lead Onion if you want to reach accounts researching your category anywhere on the internet; take Knock2 if you believe a visit to your own site is a stronger signal than a topic surge on a review site, and want to pay less than half as much.
Lead Onion compared with Knock2
Knock2 starts at $199 a month, leads with your own website traffic, publishes match rates with a stated denominator, and includes every feature on every tier including an API and MCP endpoint. Lead Onion starts at $500 and treats website visitors as a cent-per-unit line item beside twenty-plus third-party intent sources and a contact database. Take Knock2 if a visit to your own site is the signal you trust; take Lead Onion if you have already worked that traffic dry and need to reach companies researching your category elsewhere.
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 Lead Onion if
Mid-sized B2B sales organisations that have already exhausted their own website traffic as a signal source, teams that want third-party category-wide intent and contact reveal on the same platform as visitor identification, and buyers who prefer every consumable priced explicitly rather than bundled into an opaque tier.
Side by side
13 attributes| Attribute | Knock2 | Lead Onion |
|---|---|---|
| Category | Visitor ID | Visitor ID |
| Starting price | $199 per month (600 identified contacts) (7 days trial) | $500 per month (Starter) (14 days trial) |
| 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. | Tiered monthly subscription with allowances for contact reveals, intent triggers, website lookups, and users, plus published per-unit add-on rates for every consumable. |
| Free plan | No | No |
| Free trial | 7 days, self-serve, no sales call | 14 days, self-serve, no credit card required |
| 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. | Mid-sized B2B sales organisations that have already exhausted their own website traffic as a signal source, teams that want third-party category-wide intent and contact reveal on the same platform as visitor identification, and buyers who prefer every consumable priced explicitly rather than bundled into an opaque tier. |
| 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 an hour for tracking and integrations, but the real setup is configuring intent triggers, which is both the product's core work and a billed line item. Budget a proper session on trigger design rather than treating it as an afterthought. |
| 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. | Moderate to high, and the highest in this category. Multi-source intent, trigger thresholds, reveal credit economics, and cadence design are four separate disciplines, and a team used to a simple visitor identification feed will find this a different kind of product. |
| Platforms | Web application, JavaScript tracking script, REST API, MCP endpoint, Webhooks | Web application, JavaScript website tracking, CRM integrations |
| Compliance | GDPR (account-level only for EU visitors), CCPA, ePrivacy Directive (vendor-stated) | No published certifications, audits, or documented legal basis analysis |
| Founded | 2023 | 2020 |
| Headquarters | New York, New York, United States | Portstewart, Northern Ireland, United Kingdom |
| Ownership | Privately held, founder-led | Part of the Zymplify group, a privately held buyer intent and marketing automation company founded in 2013 |
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.
Lead Onion
Strengths
- Aggregates intent from more than twenty third-party providers rather than reselling one source, which is a genuinely different and harder thing to build than reverse-IP lookup.
- Every consumable is published as a per-unit add-on rate, so the full cost of a programme can be modelled before signing rather than discovered afterwards.
- A 209 million-plus verified B2B contact database with direct dials and real-time email verification at reveal time, which reduces the bounce problem that static purchased lists create.
- Built-in cadences and CRM integration inherited from the Zymplify marketing automation lineage, so the platform runs from signal through to outreach without a second vendor.
Limitations
- A $500 monthly floor with no free plan puts it out of reach for most genuinely small businesses, and out of proportion for anyone whose requirement is website visitor identification alone.
- No published website identification match rate, so the one number that matters for the visitor ID use case is unavailable before the trial.
- The vendor's own materials quote the Growth tier at two different prices, $1,750 and $2,000, which is a basic transparency failure on the most important page of the site.
- No published opt-out mechanics and no disclosed data broker registrations, which is a serious gap for a platform aggregating third-party intent from twenty-plus sources and reselling hundreds of millions of contact records.
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.
Lead Onion
Tiered monthly subscription with allowances for contact reveals, intent triggers, website lookups, and users, plus published per-unit add-on rates for every consumable.
- Starter$500
- Growth$1,750
- Scale$3,000
- EnterprisePrice on application
Lead Onion is not competitive as a website visitor identification purchase and should not be evaluated as one. At $500 a month minimum you are paying five to twenty times what a dedicated company-level tool costs, and the website lookup line item on the price list tells you plainly that identification is a cent-per-unit side dish. The value case is the aggregation: twenty-plus intent sources, a 209 million contact database with real-time verification, configurable triggers, and cadences on one platform, replacing three or four separate subscriptions. Whether that is good value depends entirely on whether you would otherwise buy an intent data vendor, an enrichment vendor, and a sequencer separately, and on whether the intent signals prove real on your category, which no vendor claim can tell you. If your honest requirement is knowing which companies visit your website, buy Snitcher, Leadinfo, Salespanel, or Leadberry and save between $450 and $480 a month.
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 profileLead Onion
Lead Onion is a good product being evaluated in the wrong category, and it is worth saying so plainly. Its price list literally sells website lookups at a cent each as a side line to twenty-plus third-party intent sources, a 209 million-record contact database, and a cadence engine. If your requirement is knowing which companies visit your website, buy Snitcher, Leadinfo, Salespanel, or Leadberry and keep the other $450 a month. Where Lead Onion earns its $500 floor is for a mid-sized B2B team that has already worked its own traffic dry, wants market-wide intent rather than site-wide, and would otherwise buy an intent vendor, an enrichment vendor, and a sequencer separately. The published per-unit add-on rates make that programme genuinely modellable, which is rare. But go in with three things settled in writing: the real Growth tier price given the published inconsistency, the website identification match rate you measured yourself during the trial, and the legal basis and opt-out mechanism behind twenty third-party intent sources that the vendor currently does not publish at all.
Read the full Lead Onion profileKnock2 profile last reviewed 2026-08-22; Lead Onion last reviewed 2026-08-22. Pricing is compiled from public sources and can change without notice. See our methodology.