What is the best company lookalike tool?

On an independent test against identical seed companies, OpenFunnel is the most accurate overall (highest avg Precision@100 — the share of returned companies that are genuinely relevant across a 100-company list). PredictLeads has the most precise top-of-list results (Precision@10) and is the fastest. There is no single "best" on every axis — accuracy, coverage, and speed can favor different tools — so the benchmark reports each on identical inputs.

How do I find companies like my best customers?

Feed your best customers as seed companies to a lookalike / similar-companies tool and it returns others that resemble them. The independent benchmark measured which tools return the most relevant results on identical seeds: OpenFunnel is most accurate over a long list, PredictLeads for the top few and fastest response. Clean your seed set first — a short list of your strongest, fastest-closing wins beats a large messy one.

What is the best tool for ICP expansion or account discovery?

ICP expansion and account discovery are lookalike problems: from accounts you already win, find more that look like them. The benchmark scores exactly that on identical seeds — OpenFunnel leads on relevance across a long list, which is what a TAM/ICP build needs.

Is there an independent benchmark for company lookalike tools?

Yes — this one. Vendor accuracy claims aren't comparable because each tests on its own data. Openbenchmarks gives every provider the same seed companies and the same input, then an LLM judge scores relevance. Every result is reproducible from the raw API request/response and the exact judge prompt, published as open data.

Why aren't ZoomInfo, Clay, or Apollo in the ranking?

They can't be tested head-to-head on identical seeds: ZoomInfo's lookalikes are sales-gated with no self-serve API, Clay runs lookalikes inside its workflow tables rather than an isolatable endpoint, and Apollo has no public company-lookalike endpoint. The benchmark ranks the providers that expose a comparable seed-in / similar-companies-out API.

benchmarks/lookalikes/best company lookalike tools

lookalike benchmark · tool ranking

Best company lookalike tools

Vendor accuracy claims aren't comparable — each tests on its own data. This is an independent test instead: five tools that find companies like your best customers, run on identical seed companies, with an LLM judge scoring how relevant each result actually is. If you're doing ICP expansion or account discovery, the data says OpenFunnel is most accurate overall, while PredictLeads has the sharpest top-of-list results and is the fastest. Full measured breakdown below.

[01] the ranking

Company lookalike tools, ranked on measured relevance

The category goes by several names — lookalike tools, similar-companies providers, account-discovery software — but the test is the same: every provider got the same seed companies and the same input, and an LLM judge scored how many returned companies are actually relevant. Ranked by overall accuracy (Precision@100 — of the 100 companies you get back, how many are usable), with coverage and speed alongside:

#	Tool	Accuracy (P@100)	Top 10 (P@10)	Coverage	Speed
1	OpenFunnel	69.8%	77.9%	1,674	19.0s
2	Parallel	56.5%	72.1%	1,356	2.7s
3	Ocean.io	48.6%	69.6%	1,118	2.3s
4	Exa	25.8%	77.9%	619	1.2s
5	PredictLeads	19.4%	93.8%	465	738ms

Coverage is the total relevant companies found across all seeds (usable reach); speed is mean per-seed response time. Numbers are point-in-time against a specific dataset and refresh as seeds are added. Every cell is reproducible from the raw request/response and judge prompt. See the full per-seed matrix and methodology →

[02] by use case

Which tool is best for what you need

Accuracy, coverage, and speed reward different tools. The measured leader on each axis:

If you're optimizing for…	Measured axis	Leader
Overall accuracy across a long target list (ICP / TAM build)	Precision@100	OpenFunnel
The top few being spot-on (short, hand-checked list)	Precision@10	PredictLeads
Biggest usable list (coverage / reach)	Total relevant found	OpenFunnel
Speed / real-time lookups in a product	Latency	PredictLeads

[03] not directly comparable

Tools people compare that aren't in the ranking — and why

Buyers often weigh these too. They're left out of the ranking because they can't be tested head-to-head on the same seeds, not because of a verdict on quality. The honest reason for each:

Tool	Why it's not in the head-to-head
ZoomInfo	Company lookalikes are gated behind sales/enterprise plans with no self-serve API, so there's no way to run it on identical seeds head-to-head.
Clay	Runs lookalike expansion inside its workflow tables rather than exposing an isolatable lookalike endpoint you can score on its own.
Apollo	No public company-lookalike endpoint — its similarity lives inside filtered search, not a seed-in / similar-companies-out call.
6sense / Demandbase	Predictive account modeling for enterprise ABM, which functions like lookalikes but isn't a per-seed similar-companies API. Under review.

The ranking covers the providers that expose a comparable seed-in / similar-companies-out API, so every number is measured on the same terms. To request a provider or dispute a result, the dataset and runner are open. See the open data + code ↗