Apollo alternatives, by where your ICP actually lives.
Apollo is the canonical mid-market B2B database — and the best choice when your ICP is on LinkedIn. It's a poor choice when your buyers are local businesses, niche verticals, or anywhere LinkedIn signals are thin. Below: seven options compared by what they're actually best for, with honest 'when Apollo still wins' callouts.
The seven alternatives, plain English.
Overwise
That's usAI sales agent that scrapes the open web (not just LinkedIn-indexed contacts) and runs send + reply end-to-end.
Best for B2B SaaS founders whose ICP is local businesses, niche verticals, or anything Apollo's contact coverage is thin on.
Goes after the same job Apollo does (find verified leads) but in the segments where Apollo's LinkedIn-anchored database is empty: padel courts, coworking spaces, restaurants, dental clinics, event organizers, hotels. Apify-driven scraping with absence-signal probes you configure, plus the full sales-development loop after.
ZoomInfo
The premium B2B contact database with the deepest mid-market and enterprise coverage in the US.
Best for Enterprise sales teams targeting mid-market and up-market SaaS / industrial / financial-services accounts.
The gold-standard premium database. Best signal depth for US-based mid-to-large companies — buying intent, technographics, org-chart. Costs reflect the depth (typically $15-30k+/year minimums). Overkill for founders selling under-$5k ACV; under-coverage for non-LinkedIn segments.
Cognism
EU-first B2B database with phone-verified mobile numbers and GDPR-compliant sourcing.
Best for Sales teams selling into EU/UK markets where GDPR-clean lead sourcing is a procurement requirement.
Stronger EU coverage than Apollo or ZoomInfo, with explicit GDPR + DPA framework that makes legal/procurement faster. Diamond Data phone-verified mobiles are a meaningful edge for outbound calling. Pricing-on-request; not aimed at small founders.
Clay
Programmable spreadsheet for lead enrichment — chain 100+ data providers and AI prompts into custom workflows.
Best for RevOps teams building custom enrichment pipelines that no off-the-shelf database covers.
Different shape: not a database, but a workflow tool that calls Apollo, ZoomInfo, Clearbit, Hunter, AI scrapers, and more from one spreadsheet. Powerful but you assemble the workflow. Strong for technical RevOps; steep curve for founders who just want leads.
Hunter.io
Domain-to-email finder + verifier — the canonical 'I have a website, find the contact' tool.
Best for Anyone enriching a list of company domains into work-email contacts with high deliverability.
Focused tool that does one thing well: email-finding + verification by domain or person. Pairs with everything else (Apollo, ZoomInfo, Clay, Overwise). Not a discovery tool — you bring the company names.
Lusha
Chrome-extension-first contact-finder optimized for LinkedIn prospecting workflows.
Best for SDRs who live in LinkedIn Sales Navigator and want one-click contact reveal as they browse.
Lighter than Apollo, more focused than Clay. Strong at the 'browse LinkedIn, reveal contact' workflow. Smaller database than ZoomInfo or Cognism; weaker coverage outside SaaS/B2B-tech.
Side-by-side, no fine print.
Apollo-vs-alternatives, answered short.
Why would I leave Apollo for a smaller tool?
If your ICP is fully on LinkedIn (mid-market SaaS, US-titled buyers), don't leave. Apollo's coverage there is excellent. You leave when your ICP is somewhere Apollo can't reach: local businesses, Instagram-native segments, EU SMBs without LinkedIn pages, dental clinics, padel courts, coworking spaces. That's the Overwise wedge.
Is Apollo's email-verification good enough?
For LinkedIn-anchored contacts, yes — Apollo's verified-email rate runs ~90% on the segments they cover well. For long-tail or local businesses, Apollo's coverage drops to ~30% and you're paying for misses. Overwise pairs Findymail (success-billed) with MillionVerifier on top, so you only pay for verified hits.
ZoomInfo, Cognism, or Apollo — which has the most contacts?
Apollo claims 275M+, ZoomInfo claims 100M+ (deeper signal per contact), Cognism is smaller (~70M+) but EU-strongest. Volume isn't the question — coverage of YOUR ICP is. Run a 100-domain sample through each before choosing if your ICP is non-mainstream.
Where does Clay fit in this stack?
Clay is the workflow layer ON TOP of Apollo/ZoomInfo/Hunter/etc — you compose enrichment chains spreadsheet-style. Powerful if you want surgical control. Slower to learn than an opinionated tool. Overwise picks the chain for you and just gives you leads + outreach; Clay gives you the legos.
Can I keep Apollo and add Overwise?
Yes — they overlap on email-finding but Overwise's discovery layer hits segments Apollo doesn't have. Common pattern: Apollo for LinkedIn-anchored ICPs (B2B SaaS, mid-market), Overwise for local-business + non-LinkedIn verticals. Suppression lists sync via CSV so you don't double-contact.
Your first leads, in 5 minutes.
"Set it up in five minutes, no demo gate. First verified list before my coffee was cold — and it sounds exactly like me."