Constant Contact vs Epsilon
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
Constant Contact is the stronger AI pick in Email Marketing: it has a visibility score of 18.9 versus 0.9 for Epsilon, and ranks ahead in 0% of the answers that name both.
Choose Constant Contact if…
- You want the brand AI engines rank higher (18.9 vs 0.9)
- best for small businesses
- simple email campaigns for small businesses
- saves money with annual prepay discounts
Choose Epsilon if…
- 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
- campaign operations, strategy, and creative services
AI visibility side by side
Latest weekly run · Nov 2
| Metric | Constant Contact | Epsilon |
|---|---|---|
| Visibility score | 18.9% | 0.9% |
| Change vs last week | New | New |
| Rank in Email Marketing | #8 | #35 |
| Share of voice | 5.1% | 0.2% |
| Mentions this run | 26 | 1 |
| Positive in AI answers | 33% | — |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
Constant Contact 0pp · Epsilon 0pp over 0 weekly runs.
Engine by engine
Constant Contact leads on 3 of 3 engines
Head to head in AI answers
1 engine answers name both brands
| Prompt | Engine | Constant Contact | Epsilon |
|---|---|---|---|
| Which Email Marketing vendors do analysts recommend? | Perplexity | #8 | #3 |
Features, pricing & fit
| Dimension | Constant Contact | Epsilon |
|---|---|---|
| Deployment | Cloud-based | — |
| Compliance | — | ISO 27001, SOC 2 audit for parts of the business |
| Founded | 1996 | 1969 |
| Headquarters | Waltham, Massachusetts, USA | Irving, Texas, United States |
| Employees | 1,001–5,000 | 5,000+ |
| Funding | Funding round led by Clearlake-managed vehicle Icon Partners VI (amount not disclosed) | — |
| Best for | Small businesses and nonprofits | Brands that want personalized, omnichannel marketing run at individual level and at scale |
Pros and cons
Themes from the AI answers that mention each brand
Constant Contact
- best for small businesses
- simple email campaigns for small businesses
- saves money with annual prepay discounts
- accessible campaign creation, automation and social tools
- best for nonprofits and events
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, “Constant Contact vs Epsilon”, https://slateindex.ai/compare/constant-contact-vs-epsilon, data of Nov 2, 2026. Licence: CC BY 4.0.