Constant Contact vs Customer.io
Constant Contact is a all-in-one marketing platform while Customer.io is a email marketing platform. Constant Contact has been around since 1995, giving it a 17-year head start over Customer.io (founded 2012). Constant Contact is the more affordable option at $12/mo — that's $88 less than Customer.io's $100/mo entry point. Constant Contact has the edge with landing pages, ecommerce integrations.
Quick Verdict
Constant Contact wins on price, deliverability, integrations.
Customer.io wins on rating.
Best for most users: Constant Contact (small businesses).
Constant Contact
Small business marketing made easy
Constant Contact is one of the most established email marketing platforms, particularly strong for small businesses and nonprofits. Its event marketing capabilities and social media integration set it apart, though its automation features lag behind newer competitors.
Customer.io
Behavioral messaging platform for product-led SaaS and tech companies
Customer.io is a behavioral messaging platform built for product-led SaaS companies that need to trigger automated emails, SMS, push notifications, and in-app messages based on real-time user events. Its visual workflow builder and Liquid templating provide deep personalization, while the built-in Data Pipelines act as a lightweight CDP. Trusted by 8,000+ companies including Notion and Segment, it starts at $100/month for 5,000 profiles.
Feature Comparison
| Feature | Constant Contact | Customer.io |
|---|---|---|
| Rating | 4.1/5 | 4.4/5 |
| Starting Price | $12/mo | $100/mo |
| Free Plan | No free plan | No free plan |
| Founded | 1995 | 2012 |
| Email Templates | 300 | 30 |
| Integrations | 300 | 150 |
| Deliverability Rate | 97% | 96% |
| Marketing Automation | ✓ | ✓ |
| A/B Testing | ✓ | ✓ |
| Landing Pages | ✓ | ✕ |
| Segmentation | ✓ | ✓ |
| Drag & Drop Editor | ✓ | ✓ |
| SMS Marketing | ✓ | ✓ |
| Ecommerce Features | ✓ | ✕ |
| API Access | ✓ | ✓ |
| Multi-Language | ✕ | ✓ |
| Web Push Notifications | ✕ | ✓ |
| Live Chat | ✓ | ✕ |
| Advanced Analytics | ✓ | ✓ |
Constant Contact: Pros & Cons
Pros
- +Longest 60-day free trial in the industry
- +Excellent event marketing features
- +300+ templates and integrations
- +Strong brand recognition and trust
- +Social media posting included
Cons
- −No free plan
- −Automation is basic on lower tiers
- −Gets expensive with larger lists
- −Interface feels outdated in places
- −Limited advanced features
Customer.io: Pros & Cons
Pros
- +Powerful visual workflow builder with real-time event-based triggers for behavioral automation
- +Omnichannel messaging across email, SMS, push notifications, in-app, and webhooks in one platform
- +Built-in Data Pipelines that serve as a lightweight CDP, unifying web, mobile, and backend data
- +Segment builder is intuitive enough for marketers without requiring dedicated engineering support
- +Startup Program offers up to 12 months free for qualifying early-stage companies
Cons
- −Essentials plan starts at $100/month for only 5,000 profiles — expensive for small teams
- −Steep learning curve for non-technical users, especially with Liquid templating syntax
- −Pricing scales aggressively past 10K profiles with significant jumps between plan tiers
- −Template editor feels restrictive for highly custom-coded email layouts
- −Searching for past messages and editing templates can be unintuitive and slow
The Verdict
Customer.io edges ahead with a 4.4/5 rating compared to Constant Contact's 4.1/5. The gap comes mainly from deliverability (4.4 vs 3.9) and ease of use (4.7 vs 4.3). On deliverability, Constant Contact reports 97% compared to 96% for Customer.io — a meaningful difference if inbox placement is critical for your campaigns.
| Criterion | Weight | Constant Contact | Customer.io |
|---|---|---|---|
| Starting Price | 30% | $12/mo | $100/mo |
| Deliverability | 25% | 97% | 96% |
| Rating | 25% | 4.1/5 | 4.4/5 |
| Integrations | 10% | 300 | 150 |
| Free Tier | 10% | No | No |
Weights determine how much each criterion counts toward the final score. See full methodology
Choose Constant Contact if…
- + You want lower starting costs ($12/mo)
- + You need ecommerce integrations
- + You need built-in landing pages
- + You're a small businesses
Choose Customer.io if…
- + You're a product led saas companies with event driven messaging needs
- + You're a technical marketing teams that want advanced automation with liquid logic
- + Powerful visual workflow builder with real-time event-based triggers for behavioral automation