"Sales intelligence" covers tools with fundamentally different data models. ZoomInfo, Apollo, and Cognism are contact databases optimized for building outbound lists; they are covered in full in our B2B data enrichment tools comparison. This post focuses on the intelligence layer above contact data: intent signals that surface accounts actively researching a purchase, predictive scoring that prioritizes your outbound list before your team even picks up the phone, and the relationship graph that only LinkedIn Sales Navigator can provide. The primary tools in that layer are 6sense, Bombora, and LinkedIn Sales Navigator.
The table below covers all six tools in the broader sales intelligence category for context. The detailed analysis that follows focuses on what these tools deliver beyond raw contact data.
| Tool | G2 Rating | Starting Price | Primary Data Type | Best For |
|---|---|---|---|---|
| ZoomInfo | 4.4 (2,600+) | ~$15K+/year | Contact + company data | Enterprise NA outbound |
| Apollo | 4.7 (9,400+) | $49/user/mo | Contact data + sequencing | SMB all-in-one outbound |
| Cognism | 4.6 (700+) | Quote only | Phone-verified contact data | EMEA SDR outbound |
| 6sense | 4.3 (900+) | ~$60K+/year | Intent + predictive AI | Enterprise ABM prioritization |
| Bombora | 4.4 (200+) | Quote only | Third-party intent data | Layering intent on any stack |
| LinkedIn Sales Navigator | 4.3 (1,900+) | $99.99/user/mo | Network + relationship intel | Social selling, warm intros |
Contact data tools: ZoomInfo, Apollo, Cognism
ZoomInfo is the market leader for North American enterprise contact and company data, with organizational hierarchy, technographic data, and intent signals available as an add-on; annual contracts start around $15,000 and G2 reviewers cite the cost and auto-renewal friction as primary complaints. Apollo combines a contact database with a built-in sequencer starting at $49 per user per month, making it the value choice for SMB outbound, though data accuracy complaints (outdated job titles, bounced emails) appear across hundreds of its 9,400+ G2 reviews. Cognism solves a specific problem: phone-verified mobile numbers for EMEA markets, with consistently reported higher SDR connect rates in the UK and DACH region compared to alternatives, though it does not include a sequencer and requires integration with an existing outbound tool.
For a full evaluation of these three tools on accuracy, geography, pricing tradeoffs, and how they compare to Lusha, see our B2B data enrichment tools comparison.
Intent data tools: 6sense and Bombora
Intent data tools don't replace contact databases — they layer on top of them. The core value proposition is identifying which accounts are actively researching a purchase before they've engaged with your marketing or sales channels. Both 6sense and Bombora do this, but through different mechanisms and at different price points.
6sense is the full-platform version of intent data. It takes third-party intent signals (from publisher networks, review sites, and search behavior), first-party engagement data (website visits, email engagement), and firmographic data, and produces a predictive model that assigns each account in your TAM a buying stage: awareness, consideration, or decision. The output is a prioritized account list that SDRs and marketers can act on weekly.
The value of that model depends on how well-defined your ICP is and how much historical conversion data 6sense can use to calibrate its predictions. Companies with tightly defined ICPs and 18+ months of CRM data to train the model on see stronger signal quality than companies earlier in their go-to-market journey. The 60 to 90 day configuration period that most 6sense reviewers describe is real — the platform produces reliable signals faster when there's more historical data to learn from.
Bombora takes a simpler approach: it tracks keyword research activity across a network of 5,000+ B2B publisher sites and surfaces companies that are reading content related to your product category at elevated rates compared to their baseline. The output is a topic-level surge score by company, which can be fed directly into CRM, marketing automation, or an ABM platform via integrations.
Bombora is often the more practical starting point for teams that want intent data but can't justify a full 6sense or Demandbase contract. Its data integrates cleanly into existing stacks — you can use Bombora intent signals in Salesforce, HubSpot, or Marketo without buying the full ABM platform — and the investment is lower. The limitation is that Bombora's topic-level signals are less predictive than 6sense's buying stage model; you know a company is reading about "data enrichment," but you don't know if they're in an evaluation cycle or just doing background research.
LinkedIn Sales Navigator: network intelligence, not contact data
LinkedIn Sales Navigator is the most widely used sales intelligence tool by seat count, partly because it's included in many enterprise LinkedIn contracts and partly because every B2B professional has a LinkedIn profile while not every professional appears in third-party contact databases.
Sales Navigator's differentiation is relationship intelligence rather than contact data. It surfaces mutual connections between your team and target accounts, tracks job changes and company news in real time, shows which of your contacts have engaged with a target company recently, and surfaces "TeamLink" introductions — warm paths to contacts through your company's collective LinkedIn network. These signals are uniquely LinkedIn's; no other sales intelligence tool has access to the relationship graph at the same scale.
Sales Navigator doesn't provide direct dials or email addresses. It complements ZoomInfo or Apollo rather than replacing them: use Sales Navigator to identify the right person and understand the context, use a contact database to find their email and phone number. Most enterprise sales stacks include both, and the ROI case for the combination is well-established among teams with structured social selling programs.
How to stack these tools
The most common configuration for a well-resourced growth-stage company (Series B+, 10–30 reps) is: Apollo or ZoomInfo as the primary contact database, LinkedIn Sales Navigator for relationship and network intelligence on priority accounts, and Bombora or 6sense for intent data when the team is ready to act on buying signals systematically. That's three tools at potentially meaningful cost, but each one is performing a different function that the others don't cover.
Smaller teams with tighter budgets typically start with Apollo (or Cognism for EMEA) as the primary data source, add LinkedIn Sales Navigator when social selling becomes a structured motion, and evaluate intent data later when the team has the process to act on it. Buying 6sense before you have SDRs trained to use intent signals in their weekly prioritization is a common way to spend $60,000 on a tool that sits underutilized.
The sequencing of tool adoption matters as much as tool selection. Get the contact data right first — that's the foundation of any outbound motion. Layer in intent data when your ICP is defined precisely enough that "account is researching data enrichment tools" translates into a specific outreach action. And add relationship intelligence (LinkedIn) when social proof and warm introductions are actually part of how your team closes deals.
For individual tool deep dives, see our reviews of ZoomInfo, Apollo, Cognism, 6sense, Bombora, and LinkedIn Sales Navigator. For teams evaluating data enrichment specifically, our B2B data enrichment tools comparison covers the stack in detail.