Apollo vs ZoomInfo vs Clay: which one fits your team in 2026

Choose by who will use the tool and what they need from it, because the three are built for different jobs. Apollo is the one a rep or founder can sign up for and use the same day. ZoomInfo is a contract you negotiate for a team. Clay is a builder’s tool: powerful when someone designs the tables, idle when nobody does.

• Choose Apollo if you want contact data and email sequences in one tool, a price you can see before a call, and a free plan to start.
• Choose ZoomInfo if several reps and a marketing team need one large database with buyer intent, website visitors and outreach workflows, and you can work through a sales-led quote.
• Choose Clay if you have an ops or data person who wants to combine many providers, add AI web research as a column and control the cost per record.
• Look past all three if your real problem is deciding which accounts deserve outreach and why now; that is covered in the last two sections.

Apollo and ZoomInfo sell their own contact and company database with tools on top; Clay sells a workspace that pulls data from other providers. That one difference explains most of the rest: how they charge, who runs them and what “accuracy” means for each.

ZoomInfo also lists marketing plans with credits and intent topics stated: Marketing Demand with 75K credits and 25 intent topics, ABM Lite with 100 topics, and ABM Enterprise with 150K credits and unlimited topics. Apollo restricts its standard plans to internal business use; reselling or building products on its data needs a separate agreement.

None of the three publishes an independently tested accuracy rate on its own pages, so the honest answer is the one you measure on your own accounts. What each vendor does state is how the data is built.

• ZoomInfo says its data comes from public web sources, company websites, SEC and regulatory filings, job postings and a contributory network of business professionals; AI removes duplicates and 300+ human researchers verify records.
• Apollo states 240M contacts and 30M companies and offers waterfall enrichment from Basic, which tries more than one source for a missing field. Its pricing page gives no accuracy percentage of its own.
• Clay’s accuracy is whatever your recipe makes it: you choose which of 150+ providers to query and in what order. That is its strength and its risk, since a poorly ordered waterfall spends credits on weaker sources first.

Firsthand reviews show the same pattern for both databases: broad and useful, but checked before sending. A Trustpilot reviewer of Apollo in September 2026 found the data useful for building lists but said it contains mistakes, so it needs cross-checking. A G2 review of ZoomInfo shown on AWS Marketplace in October 2026 says: “Company data availability has been a weak spot for me.” The counterweight is real too. Trustpilot reviewers credit Apollo’s database breadth and filters, and Trustpilot reviewers of ZoomInfo praise its intent signals and an easy dashboard. More themes are in our summaries of Apollo reviews and ZoomInfo reviews.

For a third-party view, our ZoomInfo alternatives guide covers an independent mobile-number test across 10 providers, including Apollo and ZoomInfo. We did not run our own hands-on test of any vendor here. The test that settles it for you: take 50 accounts you would actually sell to, pull the same people from each trial, run the emails through a verifier and check titles by hand.

Apollo and Clay publish prices; ZoomInfo and Cognism do not. Apollo charges per seat and gives each seat a credit allowance; Clay charges per workspace for “actions” (platform usage) plus data credits (data and AI bought from providers in its marketplace); ZoomInfo prices on licenses, credit usage and features. All figures below are published as of October 2026, before tax.

What a two-person team would pay at list price

• Apollo Basic, annual: 2 seats × $49 × 12 months = $1,176 a year, with 60,000 pooled credits granted up front. That is enough for 60,000 emails or 7,500 phone numbers, and whatever is left expires when the year ends.
• Clay Launch, annual: $167 × 12 = $2,004 a year for 180K actions and 30K data credits. Seats are unlimited on every Clay plan, so a third or fourth person adds no seat cost; how many records 30K data credits buy depends on the providers your tables call.
• ZoomInfo and Cognism: quote only. Cognism’s plans start at 5 seats, so a two-person team pays for seats it will not use.

Two details change the real cost more than the headline price. Phone numbers cost eight times what an email costs on Apollo, so a team that calls will burn credits far faster than one that only emails. On Clay, every column you add runs on every row, so a wide table across thousands of rows uses actions quickly; our Clay alternatives guide walks through how those costs add up.

For a complete beginner or a team of one to three, Apollo is the easiest place to start: it is free to try, the data and the email sequences live in one tool, and the paid plans have a 14-day trial.

• Apollo’s free plan is a sample, not a working outbound setup: 75 credits a seat each month, 2 sequences per team, 250 email sends a day and Gmail only. Basic lifts this to unlimited sequences and any email provider; daily sends stay at 250 until Professional.
• ZoomInfo is rarely a beginner’s tool. It is sold by quote with licenses and credits negotiated up front, and its value grows with the number of people using it.
• Clay rewards learning but has to be learned first. One Trustpilot reviewer in June 2026 called it a “steep learning curve, but once you’ve figured out the basics, it’s insanely powerful.” Other Trustpilot reviewers in 2026 mention credits used faster than they expected, while power users praise the flexibility of combining many sources. The free plan stops at 200 rows per table and does not include phone numbers.

Whichever you pick, a beginner’s bigger risk is not the tool but the list. A small team that exports a broad filter and emails it learns little; one that starts with 50 well-chosen accounts learns which messages work.

Clay can replace ZoomInfo for finding emails, phone numbers and company data if someone on your team builds and maintains the workflows; it does not replace ZoomInfo’s bundle out of the box.

What ZoomInfo bundles on Copilot Advanced, Clay makes you assemble: buyer intent, website visitors, location and hierarchy data, an account fit score and job-posting changes. In Clay, phone enrichment starts on Launch, while CRM integrations, HTTP API integrations and web intent signals start on Growth ($446 a month billed annually). Clay Enterprise adds SSO, role-based access and a dedicated growth strategist, things larger ZoomInfo customers often expect.

1. List what you actually use in ZoomInfo today: contact exports, intent, website visitors, CRM enrichment or org charts.
2. Rebuild the most used one in Clay on a sample of 200 records, and note the actions and data credits it took.
3. Compare coverage on the same records: how many emails and phone numbers each found, and how many bounced.
4. Price a full year from your own numbers, including the 30% premium on top-ups if you would run out.
5. Name the person who will own the Clay tables. If nobody can, stay on a database.

The trade is control over sources and cost per record, against the time it takes someone to build the tables and keep them working.

Cognism fits teams that sell into Europe as well as the US, call mobile numbers every day and have at least five people using the data.

As of October 2026, Cognism sells two prospecting plans, Standard and Pro, by personalized quote, each with 5 seats. It says its phone-verified mobiles go through extra verification layers, with up to 3x higher connect rates (its own claim), that decision-maker data is refreshed every 30 days, and it describes Do-Not-Call coverage across Europe. Pro adds intent data from Bombora, with up to 12 topics. For a US-only team of one or two that mainly emails, Apollo is the simpler fit; for a large US team that wants one platform with intent and workflows, ZoomInfo is the closer match. Our Cognism alternatives guide has a full Cognism vs Apollo table.

None of them is the right fit when the hard part is deciding which accounts to work and why now, not finding contact details for accounts you have already chosen.

• You sell to a defined market of a few hundred or a few thousand companies, and each one needs to be read, not filtered. Database filters and intent topics tell you an account matches a profile or is researching a topic; they do not write down, account by account, why it qualifies, with a dated source you can check. Clay can do this only if someone builds and tunes the research columns.
• Your buyers change for reasons that live in filings, press releases, plant announcements or leadership news rather than in job titles and headcount bands.
• Nobody has time to run the tool. A database still needs someone to filter, check and write; a workbench needs someone to build.
• You need contact details only for the few people you will actually contact, not a database seat for everyone on the team.

In those cases the first job is account research, and contact data comes second.

SalesOne is AI account research and qualification for US businesses, and it starts from the account rather than the contact record. S1 deep research agents build the account list from your ideal customer profile and keep or turn down each company they check, with its reason. Every buying signal is dated and links its source.

• In SalesOne’s own runs (four production runs, October 2026), S1 agents checked 1,051 companies and kept 249. All 802 rejects kept their reason, and 88% of those reasons contain a date.
• All 375 buying signals link their source, and 98% are dated to the day.
• For each account kept, the agents ran about 31 searches and read about 7 pages.
• In three of those runs, a review pass across 147 accounts corrected 40 signals and added 58.

Contact details come from 20+ data providers, and only for the people your team picks. A person approves every message, and every approval is recorded with who gave it. On the Managed and Custom plans, a strategist works with your team.

Where SalesOne is not the right choice

• You want a contact database to search and export at volume. SalesOne has none; Apollo or ZoomInfo is the better buy.
• You want to build your own data workflows across many providers. That is what Clay is for.
• You prospect into Europe. SalesOne researches US businesses only; Cognism leads with European data.
• You want a free plan or a price on the website. SalesOne prices each plan on a call.
• You need two-way CRM sync. SalesOne logs every sent email to your CRM by BCC.