Most tools do one of these jobs. WhoLayer does all three from one tag, one API, and one credit wallet, and it publishes its accuracy.
| Tool | Person-level visitor ID | Ecommerce shopper ID | Enrichment API | MCP server | Starting price | Cost per identified person | Published accuracy |
|---|---|---|---|---|---|---|---|
| WhoLayer | Yes (US) | Yes | Yes | Yes | Free; paid from $49/mo | $0.04 to $0.049 (1 credit) | Published quarterly on our Trust page |
| RB2B | Yes (US), Starter and up | No | Limited | No | Free (company-level only); paid from $79/mo | About $0.26 on Starter; $0.25 overage on Pro | Vendor states 15-20% person-level on Free to Pro, 35-45% on Pro+ |
| Warmly | Yes | No | Limited | No | From $10,000/yr | About $0.08 per credit at entry tier (estimate) | Vendor claims 15-25% person-level |
| Vector | Yes (US) | No | No | No | Published anchor $36,000/yr | Priced by traffic, not per person | Not published by vendor |
| Dealfront (Leadfeeder) | No (company only) | No | Yes | No | Free; paid from about €99/mo | n/a | Company-level only |
| Apollo | Add-on (US) | No | Yes | Yes | Free; paid from about $49/seat/mo | 1 credit per visitor | Not published for visitor ID |
| ZoomInfo | No (company-level WebSights) | No | Yes | Yes (read-only) | About $15,000/yr base contract | n/a | Not published for visitor ID |
| Customers.ai | Yes (US) | Yes | No | No | Not published; third parties cite $199 to $600/mo | About $0.17 to $0.20 | Relative claims only (“2-7x more accurate”) |
| Opensend | Yes (US) | Yes | No | No | From $250/mo | $0.11 to $0.25 | Self-reported 73% shopper match |
| Clay (data marketplace) | Via partners | No | Yes | Yes | Free; paid from $185/mo | Depends on provider | Depends on provider |
Competitor prices as published on their sites, November 2026; check their sites for current pricing. Where a vendor doesn't publish a number we cite a third-party source or mark it as an estimate. WhoLayer's per-person cost is the credit price on Scale and Starter plans. See pricing.
One wallet for every job
Identify B2B visitors, recover ecommerce shoppers, and enrich contacts from the same credits. No second subscription when your needs change.
Built for agents
The MCP server and API charge per result, not per seat, with per-key spend caps, so an agent running thousands of lookups costs what it finds.
Accuracy you can check
Independent tests put person-level match rates well below most vendor claims. We measure ours against a holdout set every quarter and publish it on the Trust page.
WhoLayer is the successor platform to these products. Moving takes minutes and you don't lose what you've paid for.
Step 1
Swap one tag
Replace your existing script with the WhoLayer tag. Same placement in the page head, same consent behavior.
Step 2
Keep your credits
Unused credits on an active paid plan are honored as WhoLayer credits for the rest of your current billing term.
Step 3
Reconnect your tools
Book a setup call and we reconnect Slack, HubSpot, Klaviyo, your webhooks, and your hot-lead filters with you, so alerts keep flowing on day one.
Ready when you are
Install one tag. Your first 100 identified people are free, no card needed.