Best lookalike company finder tools for B2B prospecting

Vendor “best lookalike company finder” lists aren't comparable — each ranks itself. This is an independent test instead through independent benchmarking of company lookalike / similar-companies APIs — Ocean.io, Exa, Parallel, Seltz, PredictLeads, Extruct, CUFinder, Discolike, and ZoomInfo — ranked on how relevant the companies each one returns actually are, across 48 B2B seed companies.

[01] evidence

Benchmark evidence and per-seed audit trail

Same seed companies, same judge panel, Precision@10 and Precision@100 where each endpoint supports that depth — plus the per-seed matrix so you can inspect how each vendor behaved on each company.

long listPrecision@100: how relevant a vendor stays a hundred companies deep. The metric for lists that feed automated sequences. 3 vendors cannot appear here: their endpoint returns fewer than 100 results.

Long-list lookalike quality: aggregate Precision@100 by company lookalike API vendor
Rank	Vendor	Precision@100	Avg latency	Relevant / $1 at 100
1	Seltz	63.4%	4,835 ms	12,683
2	Extruct	61.1%	2,361 ms	624
3	Ocean.io	59.5%	2,444 ms	37
4	Parallel	56.9%	2,680 ms	11,383
5	Exa	48.6%	3,014 ms	501
6	Discolike	34.6%	1,164 ms	66

short listPrecision@10: how relevant the top of the list is. The metric that matters when a person works the results by hand and only the first few rows get touched. Every measured vendor appears here, and the only question asked of them is whether the companies are right.

Short-list lookalike quality: aggregate Precision@10 by company lookalike API vendor
Rank	Vendor	Precision@10
1	PredictLeads	89.8%
2	Seltz	84.4%
3	Exa	80.8%
4	Extruct	75.0%
5	Ocean.io	74.3%
6	Parallel	69.2%
7	ZoomInfo	67.1%
8	Discolike	41.9%
9	CUFinder	38.9%

benchmarks/lookalike/lookalike-2026-q348 examples · 9 vendors

audit viewcell = Precision@100; the small label shows P@10N/Avendor not yet run (or returned fewer than K results)click any scored cell to view the companies that vendor returned

#	Company type	Ocean.io	Exa	Parallel	Seltz	PredictLeads	Extruct	CUFinder	Discolike	ZoomInfo
01	Cloud observability and monitoring platforms that offer any of application performance monitoring, log management, security monitoring, or synthetic monitoringDevtoolsseed exampleDatadogdatadoghq.com
02	Restaurant point-of-sale platforms that offer any of payments, online ordering, payroll, or inventory managementHospitalityseed exampleToasttoasttab.com
03	Plumbing and drain services companies that offer any of plumbing, drain cleaning, water cleanup, or home servicesHome Services SaaS / Chainsseed exampleRoto-Rooterrotorooter.com
04	Construction management software that offer any of project management, financials, quality, safety, or contractorsB2B SaaSseed exampleProcoreprocore.com
05	On-demand consumer super-apps that offer any of ride-hailing, delivery, payments, financial services, or merchant servicesLogisticsseed exampleGrabgrab.com

Full routing by workflow, latency, cost, and methodology: the lookalike benchmark →

[02] faq

Lookalike company finder tools — common questions

What is the best lookalike company finder tool in 2026?

Vendor "best lookalike company finder" lists rank themselves; this benchmark ranks them on evidence. On identical seed companies, a three-model LLM judge panel scores every returned company for relevance. Seltz currently returns the most relevant long lists (Precision@100 63.4%), while PredictLeads leads on top-of-list precision (Precision@10 89.8%). "Best" depends on the job — a broad long list for TAM sizing vs a tight top-10 for a sales rep to work — so compare Precision@10 and Precision@100 in the evidence below.

What is a lookalike company finder?

A lookalike company finder takes seed companies — usually your best customers — and returns other companies that resemble them by firmographics, technographics, and business model. It's the tool that decides which B2B companies belong on your prospecting list, upstream of finding contacts or running outreach. Some finders are point-and-click UIs, others are similar-companies APIs; both are measured here on the same task.

Is there a free lookalike company finder?

Several vendors offer a free tier or free trial of their lookalike company finder to expand a target account list. Free is about access, not accuracy — the quality of the companies a finder returns is what decides whether your list is worth prospecting, and that quality is exactly what this benchmark measures independently, on identical seeds, rather than taking any finder's word for it.

How is a lookalike company finder different from a similar-companies API?

Same job, different delivery. A finder is typically a UI where you paste seed companies and browse ranked results; a similar-companies API returns the same ranked companies as data your systems consume. This benchmark measures the underlying company-matching quality, so a UI finder and an API compete head-to-head on how relevant the companies they surface actually are.

Which lookalike company finder returns the most relevant B2B companies for prospecting?

That's the measured question here — seed companies in, ranked lookalike companies out, each scored for relevance by an independent judge. Seltz currently returns the most relevant long lists; PredictLeads is strongest at the very top of the list, which matters more when a human works the first ten accounts. The measured ranking beats any finder's claim about its own AI.