Relay vs Apollo

If you're comparing Relay vs. Apollo, you're asking a bigger question: should you build your go-to-market engine from connected automation tools, or consolidate into one platform that handles prospecting, outreach, and data together?

Relay and Apollo solve different problems. Relay automates workflows across your existing apps. Apollo provides B2B contact data and sales engagement in a single product. Comparing them only makes sense when you ask what your sales operation actually needs.

Here are the questions worth answering:

• Do you need a B2B contact database, workflow automation, or both?

• Is your priority finding new prospects, or connecting the tools you already use?

• How important is the accuracy of the data powering your outreach?

• Do you need verified direct dials, or is email-only outreach sufficient?

• Do you want AI that automates tasks across apps, or AI that understands your deals and buyers?

• Would your team benefit from a single intelligence layer that connects data, signals, and execution?

Here's what we recommend:

Relay is the right choice for teams that need to connect their existing tools with automation. Its visual workflow builder, human-in-the-loop functionality, and support for multiple AI models make it easy to build agents that move data between apps, route leads, and automate repetitive processes. Founded by a former Google Director of Product who led Gmail and Google Calendar, Relay brings clean design to workflow automation. However, Relay is not a data provider or sales engagement platform. It has no B2B contact database, no email sequences, and no dialer. You'll need separate tools for prospecting and outreach, then use Relay to connect them.

Apollo gives sales teams a B2B database of 275M+ contacts and 70M companies combined with multichannel outreach, a dialer, email deliverability tools, and deal management. For teams running high-volume outbound, Apollo replaces what used to require three or four separate subscriptions. Its AI generates personalized emails, summarizes calls, and updates your CRM automatically. But Apollo's data, while large, doesn't match the depth or verification standards of enterprise providers. And its workflow automation covers only sales sequences, not cross-app business processes.

Both tools solve real problems. But neither provides what enterprise go-to-market teams increasingly need: a single intelligence layer that connects the best B2B data with the context behind every deal, accessible in any tool your team uses.

ZoomInfo is an AI GTM platform built on the largest B2B dataset in the industry: 500M contacts, 100M companies, 135M+ verified phone numbers, and 200M+ verified business emails. Its GTM Context Graph processes 1.5B+ data points daily and unifies this data with your CRM records, conversation transcripts, and behavioral signals to reveal the full context of your accounts. That context fuels AI that shows not just what happened, but why it happened and what to do next. Your team can drive sales motions from GTM Workspace, run GTM plays from GTM Studio, or power their own tools through the API and MCP in any front-end, including workflow automation tools like Relay.

If you want to see how ZoomInfo's intelligence layer can power your go-to-market operation, start with a free trial.

Relay vs. Apollo vs. ZoomInfo at a glance

These tools solve different problems

Relay, Apollo, and ZoomInfo address three distinct layers of the go-to-market stack. Which layer matters most to your team is the first decision.

Relay is a connector.

It sits between your existing tools and makes them work together. Need to automatically create a HubSpot contact when a form comes in, enrich it with data from another source, send a Slack notification, and assign a task? Relay builds that workflow visually, with the option to pause for human approval at any step. Its AI agents handle repetitive tasks across Gmail, Notion, HubSpot, and 200+ other apps. But Relay doesn't generate the data or the outreach. It moves and transforms what already exists.

Apollo is a prospecting and engagement engine.

It provides the contact data and the tools to act on it: email sequences, a parallel dialer, LinkedIn steps, and meeting scheduling. For an SDR team that needs to find prospects and reach them at volume, Apollo delivers the complete loop. But its automation stops at sales sequences. It can't orchestrate processes across your broader tool stack the way Relay can.

ZoomInfo is the intelligence layer.

It provides the most comprehensive B2B data available, then adds context that makes that data actionable. The GTM Context Graph processes 1.5B+ data points daily and doesn't just tell you a deal moved to Stage 3. It captures that the CFO joined the last call and asked about six-month ROI, connects that to signals showing the company is hiring three new VPs, and matches the pattern to your previous closed-won deals. That intelligence flows into GTM Workspace for sellers, GTM Studio for marketers and ops teams, or any external tool through APIs and MCP.

The practical question: do you need a workflow connector, a prospecting engine, or a platform that covers data, intelligence, and execution?

Data quality determines everything downstream

If your go-to-market motion depends on reaching the right people, the accuracy of your contact data dictates results. A well-designed workflow or a clever email sequence is worthless if it targets the wrong person or bounces.

Relay has no data of its own.

It passes data between other tools. The quality of what flows through Relay depends entirely on what you feed it. If your CRM contacts are stale or your data provider has gaps, Relay faithfully automates those gaps across every connected system.

Apollo maintains a database of 275M+ contacts and 70M companies, built from a network of over 2 million data contributor sources.

Apollo claims a 97% email accuracy rate via 7-step verification and says it verifies 72 million emails monthly. That's a solid foundation for mid-market prospecting. But Apollo advises prospects to test coverage by region rather than publishing geographic metrics, which suggests uneven international coverage. Its phone number verification metrics are less prominently documented than its email claims.

ZoomInfo operates on a different scale.

500M contacts, 100M companies, 135M+ verified phone numbers, 120M direct dials, and 200M+ verified business emails, maintained through automated ML scanning of 28 million site domains daily, a Data Training Lab of 300+ human researchers, and a community of 200,000+ ZoomInfo Lite users who share data back. First-party data reaches up to 95% accuracy.

In a Fortune 500 competitive RFP analyzing 25 million contacts across vendors, the independent consultant concluded that "no other competitor came even close."

Source: ZoomInfo

For teams that treat outbound as a volume game with tolerance for some bounces, Apollo's data works. For teams where every call and email needs to land (enterprise sales, regulated industries, account-based strategies), ZoomInfo's verification depth and direct-dial coverage change the math.

AI capabilities reflect each platform's scope

All three platforms use AI, but toward different ends.

Relay's AI executes tasks across apps.

Its agents can extract structured data from emails, summarize meeting notes, classify content, and transcribe audio. Users choose from GPT, Claude, Gemini, and other models, or bring their own API keys. The human-in-the-loop capability lets teams pause any workflow for human review before high-impact actions proceed. This works well when AI handles the repetitive parts but a person needs to approve the result.

Source: Relay

Apollo's AI focuses on sales productivity.

It generates personalized email copy, produces call summaries and CRM updates, and builds prospect lists from natural language prompts. Apollo's AI trains on its database of 275M+ contacts and millions of engagement data points. Smartling's BDRs reported sending 10x more personalized emails. It's effective for individual sales productivity, but the AI operates within Apollo's platform boundary.

ZoomInfo's AI reasons across your entire go-to-market operation.

The GTM Context Graph doesn't just automate tasks. It captures the connections between signals and outcomes across every deal in your pipeline. Built on Anthropic's Claude, the AI in GTM Workspace tells sellers who to contact, when to engage, and what to say, drawing on CRM history, conversation transcripts, intent signals, and ZoomInfo's third-party intelligence simultaneously. Seismic's sales team boosted productivity by 54% and saved 11.5 hours per week, with 39% of active pipeline attributed to ZoomInfo signals.

Source: ZoomInfo

The distinction matters. Relay's AI connects tools. Apollo's AI speeds up sales tasks. ZoomInfo's AI understands your deals.

Workflow automation takes different forms

Relay was built for workflow automation.

Its visual workflow editor supports conditional branching, iterators, dynamic waits, and path merging. Workflows can be triggered by events in connected apps, schedules, webhooks, form submissions, or manual button clicks. Sequences create reusable sub-workflows that teams can share. The human-in-the-loop steps pause workflows for approvals, data input, or AI output review, delivered via email or Slack. Skyflow reduced the time from contract signed to hands-on keyboard by 80% using these workflows.

The limitation: Relay's 200+ integrations, while growing, remain far fewer than some competing automation platforms. Teams with niche tools may hit gaps.

Apollo's automation is sales-specific.

Sequences support automatic and manual emails, phone calls, LinkedIn steps, and custom tasks, with A/B testing and AI-assisted building. The Workflow Engine adds visual drag-and-drop automation with conditional logic and trigger-based actions. Users who adopt Workflows report booking 2.5x more meetings.

But these workflows operate within Apollo's sales engagement boundary. They can't orchestrate processes across your broader tech stack.

Source: Apollo

ZoomInfo provides automation at the intelligence layer.

GTM Studio lets marketers and RevOps teams describe audiences in natural language, define triggers based on buying signals, and launch multi-channel plays across email, calls, ads, and direct mail. Expansion plays that used to take 3 weeks now launch in 30 minutes.

For teams that need automation beyond ZoomInfo's native products, APIs and MCP expose the same intelligence to any custom agent or third-party platform, including workflow tools like Relay. The same data, the same GTM Context Graph, available in any tool.

Source: ZoomInfo

Pricing models serve different buyers

Relay uses a steps-and-AI-credits model.

The Free plan includes 200 steps and 500 AI credits per month with all features. The Professional plan at $19/month (annual) adds more steps and 2,000 AI credits. The Team plan at $59/month (annual) includes 10 users, expanded step limits, and shared workflows. Enterprise pricing is custom. All features ship on every plan; only usage limits and collaboration features differ.

Source: Relay

Apollo charges per seat plus credits.

The Free Starter plan gives 75 credits/month with limited features (only Gmail, 2 sequences). Basic costs $49/seat/month (annual) with 30,000 credits/year. Professional at $79/seat/month adds data enrichment and unlimited sequences. Organization at $119/seat/month requires 3+ seats and adds SSO and advanced security.

Watch for add-on costs: the Advanced Dialer is extra, credits don't roll over, and API access requires a Custom plan. For a deeper look at Apollo's full pricing structure and how it compares to ZoomInfo, see our Apollo pricing breakdown.

Source: Apollo

ZoomInfo is free to start with consumption credits based on usage.

The platform offers a permanent ZoomInfo Lite free tier and a 7-day free trial. Beyond that, plans are consumption-based rather than fixed-tier, reflecting enterprise positioning and data depth. Teams using ZoomInfo often eliminate separate subscriptions for data providers, intent tools, conversation intelligence, and engagement platforms, making the consolidated cost competitive with maintaining multiple point solutions.

Integration approaches differ by design philosophy

Relay treats integrations as its core product.

The platform connects to 200+ apps across CRM, email, cloud storage, project management, and AI models. Integrations are included on every plan with no premium tiers. Each integration offers strongly typed fields and automatic relationship following between records.

For apps without native integrations, Relay supports custom HTTP requests and custom JavaScript. MCP support (launched July 2025) lets users create tools for Claude and Cursor directly from Relay workflows. Apollo is among Relay's native integrations, meaning you can build Relay automations that trigger on Apollo events or push data back to Apollo sequences.

Apollo focuses on sales tool integrations.

Native CRM connections include Salesforce, HubSpot, and Pipedrive (bidirectional). The platform also integrates with Outreach, SalesLoft, Marketo, Sendgrid, and LinkedIn. The Chrome Extension works across LinkedIn, company websites, Salesforce, HubSpot, and Gmail. But API access requires a Custom plan, which limits technical buyers who want programmatic access without an enterprise commitment.

ZoomInfo provides broad programmatic access.

The App Marketplace lists 120 partner integrations. The Enterprise API covers search, enrichment, AI intelligence (account summaries, lookalikes, contact recommendations), audience management, and engagement data. The MCP server connects AI models directly to ZoomInfo's data with no custom coding. API access is included in all relevant plans.

This means ZoomInfo's intelligence can power Relay workflows, Apollo sequences, or any custom application, without locking you into a single interface.

Source: ZoomInfo

Support quality varies with company maturity

Relay's support earns consistent praise despite its small team.

Users describe support as "lightning fast, super responsive" and note that the team fixed reported bugs that same day. The company targets 24-hour response times and offers dedicated Slack channels for Enterprise customers. Documentation lives at docs.relay.app with over 100 videos and 100 pre-built templates.

For an early-stage company, this responsiveness is notable, though the small team raises questions about scalability as the customer base grows.

Apollo provides tiered support.

All users get a 24/7 AI chatbot and access to the Knowledge Base and Apollo Academy. Paid plans include one-on-one onboarding sessions and access to GTM Engineers for optimization. Teams of 20+ get live sessions with an Onboarding Manager. A Slack community of 9,000+ users provides peer support.

ZoomInfo invests heavily in customer success.

The company redesigned its onboarding from 30 to 90 days, producing a 25% improvement in satisfaction scores. ZoomInfo University offers role-specific learning paths, certifications, and a Certified Trainer program. Enterprise tiers include dedicated customer service managers. Professional services are available through ZoomInfo Labs for complex implementations.

Relay vs. Apollo vs. ZoomInfo: Which should you choose?

The right tool depends on what your go-to-market operation needs.

Choose Relay if:

• You need to automate workflows across multiple business tools

• Your existing apps work well individually but poorly together

• Human oversight on automated processes matters to your team

• You want AI agents that execute tasks across your tech stack

• You already have a separate data provider and outreach platform

Choose Apollo if:

• You need a B2B contact database and outreach tools in one platform

• Your team runs high-volume outbound and needs sequences, a dialer, and email deliverability

• You're replacing multiple point solutions (data provider + engagement platform + meeting scheduler)

• Budget is a primary concern and you want a capable platform at mid-market pricing

• You're comfortable with data that's strong but not enterprise-grade in depth

Choose ZoomInfo if:

• Data accuracy and depth are critical to your go-to-market success

• You want AI that understands your deals, not just automates tasks

• Your team needs intent signals, conversation intelligence, and verified contact data in one platform

• You're building an enterprise GTM operation that requires intelligence across sales, marketing, and ops

• You want that intelligence accessible in any tool, including workflow platforms like Relay, through APIs and MCP

For a direct head-to-head look at how Apollo and ZoomInfo compare on data, pricing, and features, see our Apollo vs. ZoomInfo comparison.

See how ZoomInfo's GTM Context Graph can power your go-to-market strategy with a free trial.

The choice between Relay and Apollo is a choice between automation and prospecting. They serve different layers of the GTM stack, and many teams will eventually need both capabilities. ZoomInfo provides the intelligence foundation that makes both layers more effective: better data flowing through Relay workflows, deeper context informing every outreach, and a clear view of why deals move or stall.

The strongest go-to-market teams don't just automate more or prospect faster. They understand their buyers better. That understanding starts with the data.

Frequently asked questions

Can ZoomInfo integrate with Relay?

Yes. ZoomInfo's API and MCP server allow its data and intelligence to power any workflow tool, including Relay. Teams can build Relay workflows that pull ZoomInfo data, enrich contacts automatically, or trigger outreach sequences based on GTM Context Graph signals without being locked into ZoomInfo's native interface.

Is Apollo better than ZoomInfo for outbound sales?

Apollo is well-suited for SMB and mid-market outbound at its price point. It bundles data, sequences, and a dialer in one platform at public pricing. For enterprise teams where direct-dial accuracy and data depth drive connect rates, ZoomInfo's 500M contacts, 135M+ verified phone numbers, and GTM Context Graph signals provide a structural advantage. Apollo wins on price and ease of entry; ZoomInfo wins on enterprise data depth and intelligence layer breadth.

Does Relay have a B2B contact database?

No. Relay is a workflow automation platform, not a data provider. It connects your existing apps and automates processes between them, but it does not generate or maintain a B2B contact database. For prospecting, you need a separate data source such as Apollo or ZoomInfo; Relay then moves and transforms that data across your stack.

How does ZoomInfo's data compare to Apollo's?

Scale: ZoomInfo has 500M contacts versus Apollo's 275M+. Verified phone numbers: ZoomInfo provides 135M+ verified phone numbers and 120M direct dials; Apollo does not publish equivalent phone verification metrics. Email accuracy: Apollo claims 97% via 7-step automated verification; ZoomInfo reaches up to 95% first-party accuracy via 300+ human researchers plus ML scanning. Both are serious data platforms; ZoomInfo's direct-dial depth and verification infrastructure are the key enterprise differentiators.

What is the GTM Context Graph and why does it matter?

The GTM Context Graph is ZoomInfo's intelligence layer that processes 1.5B+ data points daily, fusing B2B contact data with CRM records, conversation transcripts, and behavioral signals. Unlike a data vendor that shows you who to call, it shows you why to call now, what context your rep needs to bring, and which accounts are ready to move. That intelligence is accessible through GTM Workspace for sellers, GTM Studio for marketers and RevOps, or any third-party tool through ZoomInfo's APIs and MCP.

More Relay and Apollo comparisons and guides

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