Find similar companies
“Find companies like X” is two different jobs. Competitor research — who competes with a specific company — is a market-mapping task served by competitive-intelligence tools (not measured here). Lookalike search — you have a handful of companies, often your best customers, and want more that do similar work — is a prospecting task, and the tools that do it are independently measured on this site, on identical seed companies with every returned result scored for relevance.
If you're hitting the wall where basic web searches stop surfacing new names: that's exactly the job seed-based similar-companies tools are built for.
Similar-companies tools on measured relevance
Seed company in, ranked similar companies out — every result LLM-judged on identical inputs. Ranked by Precision@100:
| # | Tool | Precision@100 (long list) | Precision@10 (first page) |
|---|---|---|---|
| 1 | Parallel | 56.5% | 72.1% |
| 2 | Ocean.io | 48.6% | 69.6% |
| 3 | Exa | 25.8% | 77.9% |
| 4 | PredictLeads | 19.4% | 93.8% |
There is no single “best” company lookalike API — this independent benchmark points to a different winner depending on how you will use the results. Pick the workflow that matches yours:
- Low volume, high accuracyPredictLeadstop 10 P@10 93.8%
Reps hand-work a handful of accounts, so the top of the list has to be right. Sharpest top-of-list precision in the benchmark.
- High volume, broad reachParallellong list P@100 56.5%
A big list runs through automated sequences, so relevance has to hold deep into the results. Best long-list precision in the benchmark.
- Market / TAM sizingParallelrelevant 1,356
You are counting the universe of similar companies, not actioning a shortlist. Returns the most relevant companies across the cohort.
- Real-time in-product featurePredictLeadsavg latency 738 ms
A live “similar companies” lookup called on page-load, where response time is the constraint. Fastest average latency in the benchmark.
Full ranking, per-seed evidence, and average latency: the lookalike benchmark →
Finding similar companies — common questions
Is there an online tool to find companies alike?
Yes — and the right one depends on why you want the list. If you're researching who competes with a specific company, competitive-intelligence tools do that (not measured here). If you have a few companies — say your best customers — and want more that do similar work, that's a lookalike / similar-companies tool, and those are independently measured on this site: Parallel currently leads on long-list relevance and PredictLeads on top-of-list precision, on identical seed companies.
How do I find companies similar to my customers for lead generation?
Take 5–10 of your best customers as seed companies and feed them to a lookalike tool — it returns ranked companies that do similar work, which become your lead list. Basic web searches stop producing new names quickly; seed-based lookalike search is built exactly for that wall. Clean seeds matter more than many seeds: strong, fast-closing customers beat a large messy list.
What's the difference between finding competitors and finding lookalikes?
Competitor research asks 'who competes with company X?' — the output is a market map, and tools are judged on completeness of that map. Lookalike search asks 'which companies resemble these seeds?' — the output is a prospect list, judged on how many returned companies are genuinely relevant. This benchmark measures the second job: every returned company is scored for relevance by an LLM judge on identical seeds.
Which similar-companies tool is the most accurate?
On measured data: over a long list, Parallel (Precision@100 56.5%); for the first ten results, PredictLeads (Precision@10 93.8%). Companies like these are also findable per-vendor — every provider's per-seed results are public on the benchmark.