Every B2B data provider publishes an accuracy number. Almost none of them agree with each other, and almost none of them match what actual users report when they test the data themselves. Before comparing Lusha, Apollo, ZoomInfo, and Cognism on accuracy, it’s worth naming that problem directly, because it changes what a percentage in a comparison table is actually worth.
TL;DR
- What it is: A look at published accuracy claims for Lusha, Apollo, ZoomInfo, and Cognism, checked against independent user reports and the one methodologically-stated benchmark we could find.
- The real finding: self-reported accuracy figures across the category routinely run 15 to 25 percentage points higher than what independent users and reviewers report testing.
- The one widely-cited independent test, worth a caveat: a March 2026 benchmark ran 1,000 identical leads through Apollo and ZoomInfo, hand-verified a portion, and published its methodology, finding ZoomInfo well ahead on phone (67% versus 41% mobile match) and modestly ahead on email (84% versus 78%). Worth knowing directly: this benchmark was run by Cleanlist, a competing data-enrichment vendor. The numbers are still the most methodologically transparent in the category, but “independent” isn’t quite the right word for a test run by someone with their own product to sell against both.
- What this means practically: treat every accuracy percentage in this category, including the ones in this piece, as a starting point for testing, not a number to buy on.
How we evaluated
- Self-reported claims, what each provider states on its own site, clearly labeled as such.
- Independent user reports, G2 and Reddit testimony from people who tested the data themselves, which consistently runs lower than vendor claims.
- Independently benchmarked tests, where a third party ran a controlled comparison and published its method, rare, and weighted more heavily here than either of the above.
- Refresh cadence, how often the underlying data is actually updated, a separate question from accuracy that gets conflated with it constantly.
Quick comparison
| Lusha | Apollo | ZoomInfo | Cognism | |
Why the numbers don’t agree
This is worth sitting with before looking at any single provider. Apollo’s own site claims 91% email accuracy through a stated 7-step verification process. Independent G2 and Reddit reports on Apollo cluster between 65% and 88%, with several users reporting real-world results closer to the low end depending on region and industry. That’s not a small discrepancy, it’s the difference between “reliable enough to trust” and “verify before you send.” The same pattern shows up with ZoomInfo: internal claims reach as high as 95% with combined machine and human verification, while independent reports and comparison sites consistently land in the 85% to 92% range, and at least one source specifically flags refresh gaps of up to 90 days on certain records, meaning accurate-when-collected data can go stale well before it’s used.
The most-cited head-to-head test in this category is a March 2026 benchmark that ran 1,000 identical leads through both Apollo and ZoomInfo, hand-verified a portion, and published its testing method rather than just a conclusion, real progress over the usual dueling vendor pages. It found ZoomInfo ahead on phone, 67% mobile match versus Apollo’s 41%, and modestly ahead on email too, 84% versus 78%, a real gap, just a smaller one than either vendor’s own marketing implies. Worth naming plainly: this benchmark was run by Cleanlist, a data-enrichment vendor that competes with both Apollo and ZoomInfo. That doesn’t make the numbers wrong, the methodology is published and checkable, but “independent” isn’t quite accurate for a test run by someone with a stake in the outcome. A separate, smaller test, roughly 500 leads spot-checked by hand, reportedly pointed the same direction on the phone gap specifically, which adds some corroboration, though we couldn’t confirm its full methodology independently.
Lusha
Lusha’s internal benchmark states 98% email accuracy and 86% phone accuracy. Stated plainly: this is Lusha’s own reported figure, from Lusha’s own testing methodology, the same category of claim every other provider in this comparison makes about itself. We did not find enough independent, third-party user testing of Lusha’s accuracy specifically to compare it against an outside benchmark the way Apollo and ZoomInfo could be compared against each other.
What is independently confirmable is the refresh cadence: Lusha’s data is refreshed weekly across most contact and company fields, which is faster than the monthly and multi-month cycles reported elsewhere in this category.
What’s verifiable
- Weekly refresh cadence across most fields
- 98% email / 86% phone accuracy, stated as Lusha’s own internal benchmark, not independently verified
What isn’t yet
- No independent third-party accuracy benchmark found specifically for Lusha, the same gap that limits confidence in every provider’s self-reported number in this category
Apollo
Apollo states 91% email accuracy through a 7-step verification process, and reports refreshing 150 million contacts monthly. Independent reports tell a different story: G2 and Reddit reviewers report real-world accuracy in the 65% to 88% range, with multiple users noting results depend heavily on region and industry, weaker outside North America and outside well-covered verticals.
In the March 2026 Cleanlist benchmark, Apollo’s email accuracy landed at 78% against ZoomInfo’s 84%, a real gap but a smaller one than the phone difference, 41% versus ZoomInfo’s 67% on the same 1,000-lead sample.
What’s verifiable
- Benchmarked email accuracy (78%) closer to ZoomInfo’s (84%) than the phone gap suggests, per the March 2026 Cleanlist test
- Monthly refresh cited for bulk contact data
What isn’t yet
- Self-reported 91% accuracy runs well above both the 65-88% independent-user range and the 78% benchmarked figure
- Phone match rate notably behind ZoomInfo’s in the benchmarked test, and that test’s source, Cleanlist, is a competing vendor, not a neutral third party
ZoomInfo
ZoomInfo claims up to 95% accuracy through combined machine and human verification on first-party data. Independent comparison sites put real-world accuracy closer to 85% to 92%, and one source specifically notes refresh gaps of up to 90 days on some records, a genuine freshness concern separate from raw accuracy.
ZoomInfo performed best in the Cleanlist benchmark, 84% email accuracy and a 67% phone match rate against Apollo’s 78% and 41% on the same test set, the clearest benchmarked advantage found in this comparison, worth remembering it comes from a competing vendor’s test.
What’s verifiable
- Strongest benchmarked phone match rate of the group, 67% in the March 2026 Cleanlist test, with a smaller but real lead on email too (84% versus 78%)
- Independent accuracy estimates land closer to its own claims than Apollo’s do
What isn’t yet
- Refresh gaps of up to 90 days reported on some records by at least one independent source
- Top-end 95% claim still above both the 85-92% independent range and the 84% benchmarked figure
Cognism
Cognism doesn’t publish a single headline email accuracy figure the way the other three do. Its accuracy story centers on Diamond Data, human-verified phone numbers specifically, with a claimed 20% connection rate and success rates cited as high as 73% in independent write-ups. Email accuracy is reported as strong for European contacts specifically, less consistent for US data, which tracks with Cognism’s EMEA-first positioning generally.
What’s verifiable
- Human-verified phone data specifically for the Diamond Data subset, a distinct verification method from the other three
- Consistently described as strongest for EU and UK contacts across independent sources
What isn’t yet
- No single published email accuracy figure to compare against the other three
- US data quality described as less consistent than EU by independent reviewers
How to actually evaluate this
Don’t compare headline percentages across vendors. They’re measured differently, self-reported inconsistently, and the gap between claimed and independently-observed accuracy runs 15 to 25 points in this category. A higher stated number doesn’t reliably mean better real-world data.
Weight independent benchmarks over vendor claims, but check who ran the benchmark. The March 2026 Apollo-vs-ZoomInfo test is the most methodologically transparent data point in this comparison, but it was run by Cleanlist, a data-enrichment vendor competing with both. That’s not disqualifying, published methodology is still worth more than a vendor’s own unverifiable claim, but it’s a reminder that “independent” often just means “not the two companies being compared,” not “no stake in the outcome.” Your own test, against your own target list, is the only fully trustworthy data point.
Separate accuracy from freshness. A contact can be accurately recorded and still stale by the time you use it. Refresh cadence, weekly, monthly, or longer, matters as much as the accuracy percentage itself, and it’s the number vendors talk about least.
FAQs
Which B2B data provider has the highest accuracy?
By self-reported figures, Lusha’s stated 98% is the highest of the four. But every provider’s headline number is self-reported, and independent testing across the category consistently comes in 15 to 25 points lower than vendor claims, so a stated percentage alone isn’t a reliable way to compare providers.
Is there any independent, third-party accuracy testing for these providers?
The most-cited test is a March 2026 benchmark that ran 1,000 identical leads through Apollo and ZoomInfo, hand-verified a portion, and published its method. It found ZoomInfo ahead on both phone (67% versus 41%) and email (84% versus 78%), with a much larger gap on phone than email. Worth knowing the test was run by Cleanlist, a competing data-enrichment vendor, not a neutral party, though its published methodology still makes it more useful than either company’s own claims. We did not find an equivalent independent test that included Lusha or Cognism.
How often is B2B contact data actually updated?
It varies significantly and matters as much as raw accuracy. Lusha refreshes most fields weekly. Apollo cites a monthly refresh cycle for bulk contacts. At least one independent source reports refresh gaps of up to 90 days on some ZoomInfo records.
Why do vendor accuracy claims differ so much from user reports?
Self-reported figures typically come from a vendor’s own internal testing methodology, which isn’t disclosed in enough detail to compare across providers or verify independently. User reports reflect real-world results across varied industries, regions, and use cases, which tend to be messier and lower than a controlled internal benchmark.
Conclusion
Nobody in this category, Lusha included, has a fully independently-verified accuracy number worth taking at face value, and even the closest thing to independent testing here comes from a vendor with its own product to sell. What’s actually knowable: self-reported claims run well above independent user experience across the board, the most-cited benchmark found real but smaller gaps than the marketing suggests, and refresh cadence is a genuine, under-discussed factor separate from accuracy itself. The honest recommendation isn’t to trust a percentage, from us or anyone else, it’s to test a real sample before deciding.
Go deeper
- Best privacy-compliant B2B data providers in the US, how the same four providers compare on published certifications
- AI Connectors hub, every way to run Lusha inside an AI agent
- Our Data, Lusha’s full data standards and methodology
