These four tools share a category label but occupy different positions in the B2B data enrichment stack. ZoomInfo has a proprietary database of over 300 million contacts and sells primarily to enterprise teams on annual contracts. Apollo has 9,400+ G2 reviews and sells a combined database, sequencer, and email sender starting at $49 per month. Cognism holds certifications for GDPR-compliant phone-verified contacts and is used most heavily by teams selling into European markets. Lusha sells a credit-based prospecting tool used primarily via Chrome extension on LinkedIn. The category name groups them together; the actual buying decision usually separates them quickly once you know what you're solving for.
This comparison covers what G2 review data and published pricing reveal about each tool. ZoomInfo and Cognism don't publish pricing, so cost references draw from G2 user reports and independent review data rather than vendor pages.
| Tool | G2 Rating | Reviews | Pricing | Best For |
|---|---|---|---|---|
| ZoomInfo | 4.4/5 | 2,600+ | Quote only | Enterprise, US account intelligence + intent |
| Apollo | 4.7/5 | 9,400+ | $49–$119/user/mo | All-in-one outbound, SMB and mid-market |
| Cognism | 4.5/5 | 700+ | Quote only | European markets, GDPR-sensitive teams |
| Lusha | 4.3/5 | 1,500+ | Free; from $29/user/mo | Individual reps, targeted prospecting |
ZoomInfo: the broadest database, with a price and contract structure to match
ZoomInfo's database is the largest proprietary contact database in this comparison. The company claims coverage of over 300 million professional contacts with direct dials, work emails, firmographic data, and technographic data attached. With 4.4/5 across 2,600+ G2 reviews, the platform's rating is solid, but the patterns in the feedback are specific: data staleness is the most consistent complaint, with reviewers noting that job title changes take months to reflect, outdated emails bounce at higher rates than expected, and direct dials frequently reach former employers.
The other recurring theme is the contract structure. ZoomInfo doesn't publish pricing and sells primarily via annual contracts. G2 reviewer reports and independent pricing research consistently cite entry-level annual contracts starting in the $15,000 to $20,000 range for small teams, though enterprise deals vary considerably. There is no self-serve or monthly billing option. Teams under 10 to 15 seats regularly report in reviews that the minimum commitment makes evaluation difficult.
ZoomInfo's differentiation isn't just contact volume. The platform includes intent signals through ZoomInfo Intent (first- and third-party buying signals), technographic data on what software a company is running, organizational charts, and CRM integrations that keep the data layer current. For enterprise teams running account-based programs where the data layer needs to feed multiple workflows beyond outbound prospecting, ZoomInfo's breadth covers use cases that Apollo and Lusha don't address. That value proposition is harder to justify for teams whose primary use case is pulling contact lists for volume email sequences.
Apollo: all-in-one platform with published pricing and the largest review base
Apollo is the only tool in this comparison that bundles a contact database, email sequencer, and outbound sending infrastructure into a single platform. That combination, at a published price point starting at $49 per month, is what drives its review volume: 9,400+ G2 reviews at 4.7/5 is more review data than the other three tools combined, which gives the feedback patterns more statistical weight.
The most common criticism in Apollo's review base is data accuracy. As covered in our Clay vs Apollo data enrichment comparison, "inaccurate data" appears in 538 reviews and "data inaccuracy" in 488 across the full G2 base. The pattern is consistent: outdated job titles, email addresses that bounce, and phone numbers tied to prior roles. On Trustpilot, Apollo sits at 2.9/5 across 1,049 reviews, a gap from the G2 score that reflects where the frustration concentrates. For teams sending at high volume where a percentage of data errors is acceptable variance, this is manageable. For targeted outbound to key accounts where a wrong email signals poor research, it's a more significant problem.
Apollo's pricing is published and transparent. Basic runs $49 per user per month and includes the contact database, basic sequencing, and email sending. Professional runs $79 per month and adds A/B testing and higher sending limits. Organization runs $119 per month and adds advanced reporting and call recording. There's also a free tier with limited monthly credits that works as a genuine trial. For teams that want to move from zero to running outbound sequences within a day of signing up, Apollo's self-serve setup and full-stack feature set at this price point is difficult to match.
Cognism: the strongest case for European markets and compliance-sensitive teams
Cognism's primary differentiation in the US market is its verification standard for European contact data. The company holds ISO 27701 certification and maintains a process for telephone-verified data across GDPR-regulated markets, including the UK, Germany, France, and the Nordics. For teams cold-calling into European enterprise accounts where unverified data creates compliance and legal risk, this is a practical and documented difference from Apollo or ZoomInfo.
With 700+ reviews at 4.5/5 on G2, Cognism has less review signal than ZoomInfo or Apollo, but the feedback patterns are consistent: US data depth is the most common criticism, with reviewers noting that contact coverage for North American companies is thinner than what ZoomInfo or Apollo provide. Teams primarily selling into US markets frequently report that Cognism's differentiation is less relevant for their use case, and the pricing (quote-only, comparable to ZoomInfo in annual contract structure) is harder to justify without the compliance requirement driving it.
Cognism doesn't publish pricing. Based on G2 user reports, contracts are annual and start in a range comparable to ZoomInfo for equivalent seat counts. There is no self-serve option. The buying scenario where Cognism makes clear sense: your team is selling into European enterprise accounts, your legal or compliance function has flagged data sourcing requirements, and you need a vendor who can provide documentation on verification processes and regulatory compliance. That's a narrow but real scenario that Apollo and ZoomInfo don't address as directly.
Lusha: lightweight, credit-based, built for individual rep prospecting
Lusha is the lightest-weight option in this comparison. The core product is a Chrome extension that surfaces contact data (email address and direct dial) when you browse a LinkedIn profile or company website. The primary use case is individual reps or SDRs doing targeted, name-by-name prospecting rather than pulling large lists from a platform database.
The G2 rating of 4.3/5 across 1,500+ reviews is the lowest among these four tools, and the review complaints are specific: data accuracy issues (similar pattern to Apollo), credit consumption (the free tier runs out quickly on any real prospecting volume), and limited API access on lower tiers for teams wanting to build enrichment workflows rather than doing point-in-time lookups. The free tier offers 5 credits per month, which is enough to evaluate the product but not to run any real volume. Lusha's Pro plan starts at $29 per user per month with 50 monthly credits; higher-volume tiers require a quote.
Lusha works well for a specific role: the individual rep who needs to find a direct line or verified email for a specific contact quickly, without logging into a separate platform or building a list. It doesn't replace ZoomInfo or Apollo for teams running volume outbound or needing account-level data. The Chrome extension format also means Lusha is useful as a supplementary tool alongside a primary enrichment platform, which is how many teams end up using it.
How to choose between b2b data enrichment tools
The decision between these four tools usually resolves around two questions: what geography are you selling into, and do you need enrichment as a standalone layer or bundled with a sequencer and sending infrastructure.
For teams primarily selling into US markets that want one platform covering database access, email sequencing, and sending, Apollo is the clearest starting point. The pricing is transparent, the self-serve setup is fast, and the feature set covers the full outbound workflow for most SMB and mid-market teams. The data accuracy limitations are real and worth validating before a large campaign, but for teams iterating on outbound at volume, the tradeoffs are manageable.
For teams selling into European enterprise accounts with GDPR compliance requirements, Cognism's verification standard and compliance documentation is worth evaluating seriously, even at the premium over Apollo's European coverage. The US data depth limitation is a real constraint if your pipeline is primarily North American.
For enterprise teams running account-based programs at scale, where the data layer needs to feed intent signals, technographic filters, and organizational mapping alongside contact data, ZoomInfo's breadth covers use cases that Apollo and Lusha don't. The annual contract structure and pricing require a budget conversation that the other tools in this list don't, but the data coverage and supplemental signals are genuinely differentiated at that tier.
For individual reps or small teams that need to look up contacts on LinkedIn without committing to a platform, Lusha's free tier and low-cost Pro plan are a practical entry point. The 5 monthly free credits don't support volume prospecting, but they're enough to evaluate whether the data quality meets your standards before paying.
Most teams selling at scale eventually end up evaluating all four tools. The ones that narrow the choice quickly tend to have a clear answer to the compliance question (European markets or not) and a clear answer to the stack question (one platform or separate tools for enrichment and sending). If you're also evaluating where intent data fits in this stack, see our breakdown of what you actually get from third-party B2B intent data.