Apollo and ZoomInfo are the two dominant B2B data providers in 2026, but they serve different audiences. Apollo is a sales engagement platform with a built-in 275M+ contact database, AI prospecting, and email sequencing for a flat per-user price. ZoomInfo is a pure data intelligence platform with 300M+ contacts, intent signals, and deep firmographic enrichment, priced per seat with custom enterprise tiers. Your choice depends on whether you need an all-in-one outbound stack or a premium data layer to power your existing tools.
Short answer: Pick Apollo if you want a single platform for prospecting, data, and outreach — and you need unlimited contacts at a fixed price. Pick ZoomInfo if your team already has a CRM and outreach stack and you need the deepest firmographic data, intent signals, and technographic enrichment. For most small to mid-size teams and agencies, Apollo's all-in-one model with unlimited email credits wins on value. For enterprise teams that need the richest data layer, ZoomInfo is the established standard.
What Is Apollo?
Apollo launched in 2015 as a sales intelligence and engagement platform. It combines a database of over 275 million contacts with built-in email verification, AI-powered prospecting, and multi-channel outreach (email, LinkedIn, phone). You can build a targeted list, enrich it, verify emails, and send sequences — all without leaving the platform.
Apollo's standout feature is its pricing: every plan includes unlimited email credits for database access. This means you can export as many contacts as you want without per-credit charges (on paid plans). That alone makes it the default choice for teams that need high-volume prospecting on a fixed budget.
Apollo also offers an AI assistant that helps with account research, writing emails, and building sequences. Their mobile app and Chrome extension let your team prospect from LinkedIn and Gmail. For smaller teams, Apollo collapses four tools (prospecting, enrichment, verification, outreach) into one interface.
What Is ZoomInfo?
ZoomInfo started as a B2B contact database and has evolved into a comprehensive go-to-market intelligence platform. Its database covers over 300 million contacts and 70 million companies, with deep firmographic, technographic, and intent data. ZoomInfo's strength is data depth — it provides direct dials, org charts, technology stacks, buying signals, and intent feeds that integrate into your CRM.
ZoomInfo's product suite includes OS (data intelligence), SalesOS (CRM enrichment and Salesforce integration), Chorus (call recording and conversation intelligence), and Intent (buyer intent scores). It is built for enterprise sales teams that already have a CRM (Salesforce, HubSpot) and need a data layer to enrich their existing records, not a new outreach tool.
ZoomInfo does not include a built-in email sequencer or multi-channel outreach. It is a data platform first. You export the data and use it in your own sales engagement tool — Outreach, SalesLoft, or your CRM's native sequences. That separation of concerns is exactly what many enterprise teams want.
Feature-by-Feature Comparison
| Feature | Apollo | ZoomInfo |
|---|---|---|
| Contact database size | 275M+ contacts | 300M+ contacts |
| Company database | 60M+ companies | 70M+ companies |
| Email enrichment & verification | Built-in, unlimited on paid plans | Included (enrichment credits vary by plan) |
| Phone numbers (direct dials) | Included (credits per contact) | Yes (direct and mobile numbers) |
| Intent / buying signals | AI recommended leads (beta) | Yes (ZoomInfo Intent, purchase intent scores) |
| Technographic data | Limited (basic tech stack) | Yes (tech usage, installation counts) |
| Firmographic data | Standard (size, industry, location, funding) | Deep (org charts, hierarchies, financials, custom fields) |
| Built-in email sequencing | Yes (sequences with templates) | No (requires separate outreach tool) |
| LinkedIn automation | Basic (profile visits, connection requests) | No |
| CRM integration | Salesforce, HubSpot, API | Salesforce, HubSpot, Microsoft Dynamics, custom integration |
| Data refresh | Periodic (schedule varies) | Continuous (daily/weekly updates) |
| Chrome extension | Yes (prospect from LinkedIn/email) | Yes (view data on LinkedIn) |
| Starting price (per user/month) | $49 (Professional, annual) | ~$15,000 base per year (starts ~$1,250/mo for 1 user) |
| API access | Enterprise only (ApiPlus) | Available (additional cost) |
| Best for | Small to mid-size teams, agencies, lean sales orgs | Enterprise teams with existing CRM+outreach stack |
Pricing Comparison
Apollo and ZoomInfo are on completely different pricing planets. Apollo is built for volume at a flat rate. ZoomInfo is built for enterprise per-seat pricing with high minimums.
Apollo Pricing
Apollo offers three paid tiers (annual billing):
- Professional: $49/user/mo — unlimited email credits, 10,000 call credits per user, 6,000 verified emails, LinkedIn automation, AI assistant
- Organization: $79/user/mo — everything above plus 20,000 call credits, advanced integrations (HubSpot, Salesforce), custom dashboards
- Custom (Enterprise): Starts at $99/user/mo — ApiPlus, dedicated support, SAML SSO
Key: Unlimited email credits means you can export as many contacts as you need without worrying about per-credit costs. This is unique in the B2B data space. Call credits (phone numbers) are separate but generous.
ZoomInfo Pricing
ZoomInfo does not publish transparent pricing. Based on publicly available sources and user reports:
- Starting price: Approximately $15,000 per year for a single user (SalesOS base) — roughly $1,250/user/mo.
- Scales up rapidly: Additional users add $3,000-$5,000 per seat per year depending on modules.
- Intent add-on: Extra cost (estimated $5,000-$10,000/year).
- Minimum commitment: Typically annual contract with 1-3 user minimum. No month-to-month.
The price difference is massive. A 5-person team on Apollo Professional costs $245/mo ($2,940/yr). The same 5-person team on ZoomInfo would likely be $60,000-$80,000/year.
Data accuracy benchmark: Based on aggregated user reports and third-party audits, Apollo's email verification accuracy sits around 85-90% for standard B2B lists, while ZoomInfo reports 80-90% accuracy. However, ZoomInfo's firmographic data (company size, revenue, industry) is generally deeper and more reliable because they source it from multiple proprietary feeds. In our experience, Apollo excels at volume and speed; ZoomInfo excels at precision and depth — but you pay heavily for that depth.
Data Coverage and Accuracy
Both platforms claim tens of millions of companies and hundreds of millions of contacts. The real differences are in how they collect data and what they prioritize.
Apollo's approach: Apollo aggregates data from multiple sources — public web scraping, partner data, and signals from in-house tools. They prioritize breadth over depth. The result is a massive contact pool with decent enrichment across basic fields (email, phone, title, company, location). Email verification is built into every export, so you get a verified email address for most contacts on paid plans. The tradeoff is that richer data — org charts, technology stacks, buying intent — is more limited.
ZoomInfo's approach: ZoomInfo uses a combination of AI inference, third-party data partnerships, and a dedicated data operations team to build what they call the