Lead sourcing: where to find leads, and the tools for each route.

Lead sourcing is the work of finding the people and companies who could buy from you and getting their details somewhere your team can act on them. Some of those names you pull in from outside: contact databases, social profiles, directories, the companies visiting your website. The rest arrive because someone raised their hand on a form, at a webinar or through a referral. The tools differ by route, and most teams end up running a small stack of them rather than one.

What is lead sourcing?

Lead sourcing is the process of identifying potential buyers and capturing enough about them to start a conversation: a name, a company, an email address or phone number, and ideally a reason to think they fit. It sits at the very front of the sales process, before qualification, outreach or follow-up.

The output is a list. A good list is short, accurate and full of people who plausibly need what you sell. A bad list is long. Length is the thing most sourcing tools sell, so it is worth deciding early which of the two you are shopping for.

The term is used most in B2B sales, where a salesperson might spend a morning building a list of operations managers at logistics firms. It applies just as well to a local business collecting quote requests from its own website. Both are sourcing. One goes out to find people, the other catches the ones already looking.

How is lead sourcing different from lead generation?

Lead generation is the whole effort of creating interest: content, paid campaigns, events, partnerships, outbound, all of it. Lead sourcing is narrower. It is the step that turns that effort, or a database subscription, into specific contacts with details attached.

Put another way, a well-read article is lead generation. The form at the bottom that collects the reader’s email is sourcing. So is the rep who finds that reader’s company in a contact database a week later.

The distinction matters because the two get budgeted and measured differently. Generation is usually judged on reach and response. Sourcing is judged on the quality of the contacts it hands over, which is easier to check and far more often skipped. If you want the channel view of where interest comes from in the first place, the seven lead engines covers it. This article stays on the sourcing step.

What is the difference between inbound and outbound lead sourcing?

Outbound sourcing means you find the prospect before they have heard of you. You pick a target profile, search a database or a network for people who match, and collect their contact details for outreach. It is fast to start and entirely under your control. The trade-off is that nobody on the list asked to hear from you, so reply rates depend heavily on how well you chose them.

Inbound sourcing means the prospect finds you and leaves their details: a contact form, a quote request, a newsletter sign-up, a webinar registration, a referral from a customer. Volume is harder to turn up on demand. Each lead, though, arrives already interested, and usually with context about what they want.

Most businesses run both. A B2B team might source outbound to reach accounts that would never search for them, while its website collects inbound enquiries from everyone who did. The two produce very different leads. Report them separately or the averages will hide which one is carrying you.

There is a third, smaller category worth naming: signal-based sourcing. Tools that identify which companies visited your pricing page, or which accounts show research activity on a topic, sit between the two. The prospect has shown some interest, but has not introduced themselves. You still have to go and find the right person.

Which sourcing methods need which tools?

Each sourcing method has its own category of tool, and the categories overlap less than their marketing suggests. This is the map.

Two things the table does not show. First, several prospecting platforms now bundle outreach, so the line between sourcing the contact and emailing it has blurred. Second, the inbound rows depend on a website that people already visit. A pop-up on a site with no traffic sources nothing, very politely.

Which lead sourcing tools are worth knowing?

Ten tools, one per line, described in terms of what the vendor’s own site says the product does. None is a recommendation over the others; each suits a different method from the table above. Prices change often and several are quote-only, so none are quoted here.

• Apollo.io: a sales platform combining a B2B contact database, waterfall enrichment and email sequencing. It has a free plan.
• ZoomInfo: contact, firmographic and technographic data with buyer intent signals and direct dial numbers, sold as an all-in-one go-to-market platform.
• Cognism: B2B contact data with a European focus, phone-verified mobile numbers and Do-Not-Call coverage across Europe, plus signals such as hiring and funding news.
• LinkedIn Sales Navigator: search of LinkedIn members with more than 50 filters, lead and account recommendations, and alerts on job changes. CRM sync is on the Advanced Plus plan, and there is a free trial.
• Hunter: an email finder, email verifier and domain search, with cold email sequences added on. The free plan includes 50 credits a month.
• UpLead: B2B contact data with verified emails, mobile direct dials, technographic search and intent data. The free trial gives 5 credits for 7 days.
• Dealfront: the company behind Leadfeeder, which identifies the businesses visiting your website even when nobody fills in a form. It identifies companies, not individual people, and offers a free visitor identification tier.
• OptinMonster: pop-ups, floating bars, slide-ins and inline forms for your own site, with exit-intent triggers and A/B testing. It works on WordPress, Shopify, Wix and Squarespace.
• Demio: a webinar platform with registration pages, custom registration fields and attendance tracking, so each registrant arrives with context. It offers a free trial.
• Extole: an enterprise platform for refer-a-friend, ambassador and loyalty programmes, with automated rewards and programme analytics.

Your CRM belongs in the stack too, although it sources nothing by itself. It is where every one of these tools sends its contacts. That makes it the one place a sourcing channel can be compared against the others, provided each contact arrives labelled.

How do you evaluate a lead sourcing tool?

Start with who you want, not with the tool. A sourcing tool multiplies whatever targeting you give it. Give it a vague profile and it will return thousands of vaguely right contacts, quickly.

Then work through these checks, roughly in this order.

• Coverage of your market. A database strong on US software firms can be thin on Australian trades businesses or European manufacturers. Search for twenty accounts you already know before you sign anything.
• How the data is verified. Ask how emails are checked and how often records are refreshed. People change jobs; a contact that was right last year bounces this year, and bounces damage your sending reputation.
• Where the contacts end up. A tool that writes into your CRM gets used. A tool that exports a spreadsheet gets used once, enthusiastically.
• Whether it labels its own output. Every contact it produces should carry a source value you can report on later. If the tool cannot tag its records, your CRM will lump them in with everything else.
• What compliance it supports. Look for opt-out handling, suppression lists and documentation of where the data came from. You will need the last one if a prospect asks.
• The pricing model. Credits, seats and contact caps behave very differently as you grow. Work out the cost of the volume you actually expect, not the plan on the banner.

Finally, pilot it. Run one tool on one segment for a fixed period, then count what came out the other end. Contacts exported is not the number. Meetings booked is closer. Customers won is the one that decides the renewal.

How do you tell which sourcing channel produces customers?

Record the source on every lead at the moment it arrives, then follow those leads to closed deals and compare channels by customers won. Lead counts will not do it. A database export can outnumber your website enquiries many times over and still produce fewer customers.

In practice that means three habits.

• Tag outbound sources at import. When contacts come from a database or a network search, set the lead source field in your CRM as they are imported, and keep one consistent value per tool. The standard lead source types give you a starting list.
• Capture inbound sources automatically. People who arrive on your site from a campaign, a search, a partner link or an outreach email should carry that source into the form they submit. Tagged links and hidden fields do part of this; six ways to track lead sources compares the methods and where each one breaks.
• Report on revenue, not volume. Once source values are reliable, compare cost per customer by channel. The expensive-looking channel is sometimes the cheap one.

The weak point is the gap between tools. A contact sourced in one platform, emailed from a second, who then books through your website form, can arrive in the CRM labelled as a direct visit. Every tool counted its part. Nobody recorded the whole path.

That website step is what Lead Source handles. It records the real source, landing page and full page journey of every enquiry submitted through your website forms, with first-touch and last-touch source on each lead, and it works with the form tool you already use. It does not find, buy or supply leads. It shows which of your sourcing channels produced the enquiries that became customers, so you can put more behind those and cut the ones that bring nothing. See lead source tracking for how it works, or form tracking for the capture side. If you are weighing it against other attribution software, ten attribution tools compared sets out the options.

What are the rules on sourced contact data?

Buying or scraping contact data does not remove your obligations to the people in it. The rules depend on where the recipient is, and the main ones for email are these.

• United States (CAN-SPAM). The Act makes no exception for business-to-business email. Commercial messages need accurate header information, a non-deceptive subject line, a valid physical postal address and a clear way to opt out, and opt-out requests must be honoured within 10 business days. Each non-compliant email can carry its own penalty. Source: the FTC’s CAN-SPAM compliance guide.
• European Union and United Kingdom (GDPR). When you hold personal data you did not collect from the person directly, Article 14 requires you to tell them, including which source the data came from. That must happen within a reasonable period and at the latest within one month, or by your first message if you contact them sooner. Source: GDPR Article 14.
• United Kingdom email marketing (PECR). You can email corporate bodies without prior consent, but sole traders and some partnerships count as individuals and need consent, unless they bought something similar from you before and did not opt out. Every message must identify you and offer a working opt-out. Source: the ICO’s guidance on electronic mail marketing.

Before using a purchased or enriched list, ask the vendor how the data was collected and on what lawful basis. Keep a suppression list of everyone who has opted out, and screen every new import against it. For inbound leads, state on the form what you will do with the details and collect consent where the law requires it.

Other countries have their own rules, and phone and text outreach are regulated separately from email. Check the rules for each market before you contact it.

Where should a small team start with lead sourcing?

With the route you can already sustain. A business with a website people visit has an inbound sourcing channel today: its forms. Making sure every enquiry carries its source is cheaper than any database subscription and tells you which of your existing channels deserve more budget.

Add outbound when there is a defined list of accounts you want and cannot wait for. Start with one tool, one segment and a fixed trial, tagged so its leads can be told apart. A stack of five tools bought in the same month produces five dashboards and no clear answer.

Then keep the one that brings customers. That is the whole method.