ApolloThe AI GTM System for Go-to-Market Teams
vs
Customer.ioCustomer Engagement Platform For Better Outcomes
Comparison · Email Marketing · weekly run Nov 2
Apollo vs Customer.io
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
Customer.io is the stronger AI pick in Email Marketing: it has a visibility score of 6.2 versus 0.4 for Apollo.
Choose Apollo if…
- You want a free plan to start
- AI answers describe it more positively (60% vs 34% positive)
- You need SOC 2 or ISO/IEC 27001 or CASA Tier 2 or CPRA or EU-US DPF or PCI DSS coverage
- You prefer a larger, established vendor (501–1,000 employees)
Choose Customer.io if…
- You want the brand AI engines rank higher (6.2 vs 0.4)
- You need ISO 27001 or SOC 2 Type II or HIPAA coverage
- Usage-based pricing suits your budget better than per seat
- Strong behavioral and event-driven automation
AI visibility side by side
Latest weekly run · Nov 2
| Metric | Apollo | Customer.io |
|---|---|---|
| Visibility score | 0.4% | 6.2% |
| Change vs last week | New | New |
| Rank in Email Marketing | #40 | #16 |
| Share of voice | 0.3% | 1.7% |
| Mentions this run | 1 | 10 |
| Positive in AI answers | 60% | 34% |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
Apollo 0pp · Customer.io 0pp over 0 weekly runs.
Engine by engine
Customer.io leads on 2 of 3 engines
ChatGPT
AI Mode
Perplexity
ApolloCustomer.io
Head to head in AI answers
0 engine answers name both brands
0Apollo ranked higher
0Customer.io ranked higher
Features, pricing & fit
| Dimension | Apollo | Customer.io |
|---|---|---|
| Pricing model | Per seat | Usage-based |
| Entry price | Contact sales | $100 / mo |
| Free plan | Yes | No |
| Deployment | Cloud platform | Cloud-hosted, with US and EU data centers |
| Integrations | 200+ | — |
| Compliance | GDPR, SOC 2, CCPA, ISO/IEC 27001, CASA Tier 2, CPRA, EU-US DPF, PCI DSS | GDPR, CCPA, ISO 27001, SOC 2 Type II, HIPAA |
| Support | Email support at support@apollo.io, Dedicated support on Custom plans, Sales team for Custom plan discussions | Email and chat support, Documentation and community support, Dedicated Customer Success Manager on Enterprise |
| Founded | 2015 | 2012 |
| Headquarters | San Francisco, CA | Portland, Oregon, USA |
| Employees | 501–1,000 | 201–500 |
| Funding | Series D · $250M raised | Series A led by Spectrum Equity |
| Best for | Sales and go-to-market teams that run prospecting, outreach and dialing and want data, AI and execution in one system | Teams getting started with data-driven messaging, and teams scaling across channels with custom workflows. |
Plans side by side
Customer.io
Essentials$100month, billed monthly (starts at, 5k profiles)
Premium$1,000month, billed yearly (starts at)
EnterpriseCustomcontact sales
Pros and cons
Themes from the AI answers that mention each brand
Apollo
- Large B2B contact database combined with prospecting and email sequencing
- Transparent self-serve per-user pricing with a free tier
- Strong all-in-one value for prospecting and outreach
- Affordable, reliable choice for small teams and startups
- Widely used and highly rated by reviewers
Customer.io
- Strong behavioral and event-driven automation
- Well suited to product-led SaaS companies
- Supports onboarding, activation and retention messaging
- Frequently shortlisted as a top marketing automation choice
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “Apollo vs Customer.io”, https://slateindex.ai/compare/apollo-vs-customer-io, data of Nov 2, 2026. Licence: CC BY 4.0.