ApolloThe AI GTM System for Go-to-Market Teams
vs
EpsilonUnlock marketing's full potential
Comparison · Email Marketing · weekly run Nov 2
Apollo vs Epsilon
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
Epsilon is the stronger AI pick in Email Marketing: it has a visibility score of 0.9 versus 0.4 for Apollo.
Choose Apollo if…
- You need GDPR or SOC 2 or CCPA or ISO/IEC 27001 or CASA Tier 2 or CPRA or EU-US DPF or PCI DSS coverage
- 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
Choose Epsilon if…
- You want the brand AI engines rank higher (0.9 vs 0.4)
- You need ISO 27001 or SOC 2 audit for parts of the business coverage
- You prefer a larger, established vendor (5,000+ employees)
- flexible technology for high-volume programs
AI visibility side by side
Latest weekly run · Nov 2
| Metric | Apollo | Epsilon |
|---|---|---|
| Visibility score | 0.4% | 0.9% |
| Change vs last week | New | New |
| Rank in Email Marketing | #40 | #35 |
| Share of voice | 0.3% | 0.2% |
| Mentions this run | 1 | 1 |
| Positive in AI answers | 60% | — |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
Apollo 0pp · Epsilon 0pp over 0 weekly runs.
Engine by engine
Epsilon leads on 2 of 3 engines
ChatGPT
AI Mode
Perplexity
ApolloEpsilon
Head to head in AI answers
0 engine answers name both brands
0Apollo ranked higher
0Epsilon ranked higher
Features, pricing & fit
| Dimension | Apollo | Epsilon |
|---|---|---|
| Pricing model | Per seat | — |
| Entry price | Contact sales | — |
| Free plan | Yes | — |
| Deployment | Cloud platform | — |
| Integrations | 200+ | — |
| Compliance | GDPR, SOC 2, CCPA, ISO/IEC 27001, CASA Tier 2, CPRA, EU-US DPF, PCI DSS | ISO 27001, SOC 2 audit for parts of the business |
| Support | Email support at support@apollo.io, Dedicated support on Custom plans, Sales team for Custom plan discussions | — |
| Founded | 2015 | 1969 |
| Headquarters | San Francisco, CA | Irving, Texas, United States |
| Employees | 501–1,000 | 5,000+ |
| Funding | Series D · $250M raised | — |
| Best for | Sales and go-to-market teams that run prospecting, outreach and dialing and want data, AI and execution in one system | Brands that want personalized, omnichannel marketing run at individual level and at scale |
Plans side by side
Epsilon
Pricing not available.
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
Epsilon
- flexible technology for high-volume programs
- campaign operations, strategy, and creative services
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “Apollo vs Epsilon”, https://slateindex.ai/compare/apollo-vs-epsilon, data of Nov 2, 2026. Licence: CC BY 4.0.