Apollo.io vs Clay (2026)
The decision is whether you want one database or a way to query many. Apollo sells its own, built from a contributor network of more than two million people, publicly available sources and purchased lists, all named, behind five published tiers from a free plan to one hundred and nineteen dollars a user a month, with sequencing and a dialer on the same seat. Clay sells orchestration over a marketplace of more than one hundred and fifty providers, and its waterfall queries them in turn until one returns the field. An independent thirty day test reported email match near seventy eight percent against roughly forty two percent from single source tools, and each field arrives attributed to the provider that supplied it. The model layer separates them too. Clay names its model providers, publishes an artificial intelligence subprocessor list and binds those providers by contract never to train on customer data, while Apollo names no model behind its assistant. Where each is weakest mirrors that. Clay's processing agreement arrives only by email and the platform assumes an operator, with a four to six week learning curve reported. Apollo's sequencer carries a D on sending discipline.
- Your team needs to prospect this week rather than build first. Apollo is a finished database with search filters, sequencing and a parallel dialer on one seat, where independent reviews of Clay report a four to six week learning curve and teams commonly assigning a dedicated operator.
- Pricing should follow the seat rather than the workflow. Apollo publishes per seat rates of forty nine, seventy nine and one hundred and nineteen dollars a month billed annually with credit allocations per tier, so the bill does not depend on how many providers a waterfall calls.
- Your privacy review wants the paperwork on the website. Apollo publishes its processing addendum at a stable address, incorporated into its terms with standard contractual clauses, and names its data broker registrations in four states, where Clay's processing agreement is obtainable only by emailing a security address.
- Match rate matters more than one vendor's coverage. Clay's waterfall queries more than one hundred and fifty marketplace providers in sequence until one returns the field, and an independent thirty day test on two thousand contacts reported email match near seventy eight percent against roughly forty two percent from single source tools, from a reviewer who sells a competing product.
- You need to know which company supplied each field. Because the marketplace is the product, a customer selects providers by name and sees each one's credit price, so at the point of use the source of an email address or phone number is known, which an aggregated database cannot structurally offer.
- Your security team will ask which models read your data. Clay names its model providers, maintains an artificial intelligence subprocessor list on its trust site and states that those providers are contractually bound never to train on customer data, where Apollo names no model behind its AI Assistant or email writer.
This comparison is published by GTM Tech Index, an independent research platform that compares go to market software vendors objectively. Apollo.io and Clay are each graded against the same capability taxonomy, from each vendor's own public materials, under the GTM Tech Index verification standard. No vendor pays for placement, and no vendor has reviewed this page. How this evidence is graded
Plain facts
| Apollo.io | Clay | |
|---|---|---|
| Primary category | Data & Enrichment | Data & Enrichment |
| Founded | 2015 | 2017 |
| Headquarters | San Francisco, California, United States | New York, New York, United States |
| Website | www.apollo.io | www.clay.com |
Side by Side
| Axis | A Apollo.io |
C Clay |
|---|---|---|
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AI Capability
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| AI Centrality | ||
| Autonomy and Oversight Model | ||
| AI Disclosure and Model Transparency | ||
| Operational and Outcome Evidence | ||
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Compliance and Risk
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| Outreach Compliance Posture | ||
| Data Privacy Posture | ||
| Data Licensing and Provenance | ||
| Platform Terms Exposure | ||
| AI Safety and Data Stewardship | ||
| Recipient Disclosure and Authenticity | ||
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Integration and Deployment
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| Ecosystem and Integration Depth | ||
| Deployment Model and Data Residency | ||
| Security Certifications and Trust Center | ||
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Commercial and Operational
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| Commercial Transparency | ||
| Exit and Data Portability | ||
| Deliverability and Sending Discipline | ||
| Segment and Market Coverage | ||
Product updates
The latest logged changes from each vendor, newest first, each linked to its source.
Apollo.io
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Product / capability
At its ApolloNEXT event Apollo launched the Apollo Intelligence Layer, which it states is available now.
Source -
Product / capability
Apollo added structured error_details to selected REST and MCP errors, with stable codes and recovery guidance covering search validation and enrichment failures.
Source
Clay
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Security / compliance
Clay added SCIM provisioning, so admins can connect Okta, Azure AD or another identity provider through the WorkOS Admin Portal and have workspace members added and removed automatically, with identity provider groups mapped to the Admin, Editor, Viewer and Sales rep roles.
Source -
Product / capability
At its Sculpt conference Clay launched a global agent that takes an outcome, such as finding ideal customer contacts at high intent companies and building a campaign, then sources companies and contacts, saves them to an audience segment, picks signals and drafts a sequence for the user to review and approve.
Source -
Product / capability
Clay made its Plugin available to all customers, bundling its CLI and API for coding agents such as Claude Code and Codex.
Source
The short version of each
Apollo.io
Apollo.io is a self serve prospecting platform built around its own business contact database, which it states is assembled from a contributor network of more than two million people, publicly available sources and purchased lists, with sequencing, a parallel and international dialer and website visitor identification sold on the same seat. The GTM Tech Index grades it A on data licensing and provenance for naming those routes and the product features that capture contributed contacts, and A on commercial transparency, data privacy and outreach compliance. Its five tiers are published from a permanent free plan to one hundred and nineteen dollars a user a month billed annually, and its processing addendum sits at a stable public address. It grades C on model transparency and stewardship, naming no model provider and stating no training boundary, and B on deliverability, where warmup, bounce suppression and blocklist monitoring are now built in for a sequencer that sends from the customer's own mailbox.
Source: GTM Tech Index, 2026
Clay
Clay is a New York data enrichment and go to market workflow platform founded in 2017 and built on a spreadsheet interface, where a user builds enrichment sequences against a marketplace of more than 200 data providers. Its defining capability is waterfall enrichment, querying the same field against several providers in turn until one returns a result, with an AI research agent per row and a built in email sequencer. The GTM Tech Index grades it A on stewardship, where its terms bar training any AI model on customer data and it holds ISO 42001, and B on model transparency, where it publishes the models it offers, and on commercial transparency, with published tiers and data credits from $0.05. It grades B as well on data privacy, residency and outreach compliance: its processing agreement is published, data is processed in one United States region, and its sequencer adds unsubscribe links and blocklists.
Source: GTM Tech Index, 2026
Common questions
Should I use Clay or Apollo.io?
Use Apollo if you want a working database, sequencer and dialer on day one at a published seat price. Use Clay if match rate and field level provenance matter more than speed and you have someone to operate it: its waterfall across more than one hundred and fifty providers tested near seventy eight percent email match against roughly forty two percent from single source tools. The GTM Tech Index grades Apollo stronger on privacy and compliance paperwork, and Clay stronger on model transparency.
Can Clay replace Apollo.io?
For enrichment and research, often yes, and with a higher measured match rate. Clay now carries a built in email sequencer as well. What it does not carry is Apollo's parallel and international dialer, and it asks more of the team: reviews report a four to six week learning curve. Apollo also answers more of the paperwork a compliance team asks for, with a published processing addendum and named data broker registrations, where Clay's processing agreement is available only on request. Graded by GTM Tech Index against seventeen capability axes from each vendor's own published materials, verified September 21, 2026. No vendor pays for placement.
How do Apollo.io and Clay price?
Both publish real numbers, on different units. Apollo prices per seat at forty nine, seventy nine and one hundred and nineteen dollars a month billed annually, above a free plan. Clay prices per workspace in credits: a free tier with one hundred data credits and five hundred actions a month, self serve tiers at one hundred and eighty five and four hundred and ninety five dollars monthly, data credits from five cents, and custom enterprise. Clay's page states its tier prices two different ways, so ask which governs. Graded by GTM Tech Index against seventeen capability axes from each vendor's own published materials, verified September 21, 2026. No vendor pays for placement.
Which one is more transparent about AI?
Clay, graded A on stewardship and B on model transparency against Apollo at C on both in the GTM Tech Index. Clay publishes the models it offers and a subprocessor list naming its AI providers, and its terms of service bar training any AI model on customer data, including inputs and outputs. Apollo names no provider, family or version behind its AI Assistant, email writer or research agents, and states no training boundary.
How does the GTM Tech Index grade Apollo.io and Clay?
Both are graded on the same seventeen capability and compliance axes from public sources, at documented depths of sixteen and seventeen. Apollo takes A on commercial transparency, data licensing, data privacy and outreach compliance, and B on deliverability. Clay takes A on stewardship and no D: B on fourteen axes, including model transparency, pricing, provenance, data privacy, residency, deliverability and outreach compliance, and C on AI centrality and recipient disclosure. The index publishes no composite score and declares no winner.
Related comparisons
Other published head to head assessments involving these vendors or their closest peers. The full set for this category is on the Data & Enrichment page.
The shared silence is what happens after the data becomes a message. Both platforms now send. Apollo sequences from the customer's own connected mailbox, and Clay's built in sequencer sends campaigns straight from enrichment tables, so a contact bought from a marketplace provider moments earlier can reach outbound without leaving the product.
Both publish warmup guidance, and Clay's sequencer adds unsubscribe links and blocklists, but neither publishes complaint thresholds or suppression handling across customers, and neither states a position on disclosing that a message was machine written. Apollo's broker registrations and European representative cover the person in the database rather than the message that person receives.
The benign reading is that both treat sending compliance as the customer's obligation under CAN-SPAM and its equivalents, which it largely is. Exit is the second gap. Clay lets a departing customer export tables as CSV during the term and for 30 days after termination, but says nothing about moving the waterfall logic that is the real asset of a mature deployment. Apollo meters export by tier. Ask both in writing for their suppression handling, and ask Clay what leaves with the account.