What is “who knows who” software?
“Who knows who” software is a category of B2B sales tools that surfaces the human relationships inside your company — and across your extended network — that connect you to the people you want to sell to.
The premise is simple. Your next customer probably knows someone who already trusts you. A teammate worked with their VP. A customer sat on a panel with their CMO. An investor sits on three boards with their CEO. A partner sold into them last quarter. Somewhere in that web is a warm path. The problem is that none of it lives in your CRM. It lives in inboxes, calendars, LinkedIn connections, and people’s heads.
“Who knows who” tools pull that signal out, map it, and route it to the right person on your team so the intro can actually get made.
Why companies are building entire GTM motions around this
The math has changed. Cold outbound used to convert. In 2026, it doesn’t.
- Reply rates on cold sequences sit at 1–2%, even with AI personalization.
- Pickup rates on cold calls hover around 3%.
- The average B2B buyer ignores 99% of vendor outreach by default.
Meanwhile, the data on warm intros is uncomfortable for anyone running a cold-only motion. Warm-intro meetings convert to opportunities at 3–4x the rate of cold outbound. They close faster. They have lower discounts. And they’re sourced from a moat your competitor can’t copy — your company’s collective relationships.
The catch: doing this manually doesn’t scale. No SDR is going to grep through 40,000 LinkedIn connections across 12 teammates looking for a path to one CFO. That’s what “who knows who” software does.
What good “who knows who” software actually does
Four jobs, in order:
- Build a relationship graph. It ingests email metadata, calendar events, LinkedIn data, CRM contacts, and Slack signals from across the company. Each connection gets scored by strength (recency, frequency, depth).
- Detect intent. When a target account shows buying signal — job change, funding round, intent data, expansion — it triggers the warm-path search automatically.
- Route to the right person. The intro request goes to the owner of the relationship, not just the person with the closest connection. A customer intro routes through the CSM. A partner intro routes through the partner manager. A board intro routes through the founder.
- Close the loop in your CRM. When the intro converts to a meeting, the path that produced it gets attributed back. The graph learns. The next routing decision is smarter.
If a tool stops at step one — just showing you a giant graph — it’s not “who knows who” software. It’s a directory. The value is in what gets surfaced, when, to whom, with what guardrails.
The four pillars of “who” worth mapping
Most tools cover only the first pillar. The ones that move pipeline cover all four.
- Team. Your employees, past and present. Their alumni networks.
- Customers. Your existing customer base. The champions inside those accounts.
- Board, investors, advisors. The people with concentrated networks who’ll open one door per quarter if asked well.
- Partners. Your integration partners, channel partners, and consultants who sell into the same accounts.
A path that walks across two or three of these pillars (a customer who used to work at the target, an investor who knows the new CRO) is dramatically warmer than any single-pillar match.
What to look for when evaluating
- Does it ingest from all four pillars — not just employee LinkedIn?
- Does it route intros through the relationship owner, with governance rules baked in? (The SDR can’t DM the CEO of a customer. That has to be enforceable.)
- Does it live in the tools your team already uses — Slack, Salesforce, HubSpot, Gmail — or does it require a new dashboard nobody opens?
- Does it attribute outcomes back to paths, so the system improves over time?
- Does it respect privacy? The graph should be derived from metadata, not the contents of emails or DMs.
How this differs from a CRM, a sales intel tool, and an ABM platform
A CRM stores known relationships. A sales intel tool tells you who works where. An ABM platform orchestrates campaigns against target accounts. None of them surface the warm paths between you and a target buyer, automatically and with routing.
“Who knows who” software sits on top of all three. It’s the layer that takes everything those tools already know and turns it into a specific, actionable intro.
Boomerang and the “who knows who” question
Boomerang AI is built on this premise. We map your team, your customers, your board, and your partners into a single warm-path graph, then route the right intro to the right owner inside Slack, Salesforce, or HubSpot. Most teams that turn it on see warm-intro reply rates between 30 and 50%, compared to 1–2% on cold.
If your next quarter depends on opening enterprise logos that don’t take cold calls, the question isn’t whether to build a “who knows who” motion. It’s whether you build it manually or let the software do it.
