Best for
Best for small businesses that want an email marketing platform with templates, automation and an AI content generator, and phone support to get started.
- Freelancers
- Small and mid-sized
Email Marketing Comparison
Constant Contact vs. Klaviyo
At a glance
At a glance
Best for
Best for ecommerce and B2C teams that want email and SMS driven by a customer data platform with real-time segmentation and deep store data.
- Freelancers
- Small and mid-sized
- Enterprise
Cataleo does not name a winner. Both statements come from the vendors themselves.
Full Comparison
| Criterion | Constant Contact | Klaviyo |
|---|---|---|
| Starting price | From $12 / month Lite plan; the price scales with the number of contacts. Prepaying for 12 months saves up to 15 percent. | Free plan for up to 250 active profiles and 500 email sends a month The free plan also carries $5 of mobile messages and $5 of Composer usage a month, with email support for the first 60 days. Paid plans scale with the number of active profiles and the message volume on top. |
| Free trial | Free trial available, no credit card required | Free plan for up to 250 active profiles and 500 email sends per month, plus $5 of mobile messages a month |
| API | Yes, a v3 REST API for contacts and email campaigns with webhooks and OAuth 2.0 | Yes, a REST API with webhooks, SDKs, warehouse syncs and more than 350 integrations |
| Hosting | Cloud (SaaS) | Cloud (SaaS) |
| Made in | United States | United States |
| Campaign types | Yes, email campaigns, with 500 SMS messages a month and social posts on the Premium plan | Yes, email campaigns with SMS and push from the same customer profiles |
| Automation and journeys | Yes, automation templates, one on Lite, three on Standard and unlimited custom automations on Premium | Yes, automation flows triggered by customer behaviour and events |
| Segmentation and personalisation | Yes, ten custom segments on Standard and unlimited custom segments with dynamic content on Premium | Yes, real-time segmentation with predictive analytics on unified customer profiles |
| Templates and editor | Yes, an email editor with templates and an AI content generator | Yes, a drag-and-drop email editor with templates |
| Deliverability and testing | Yes, subject line A/B testing and automatic resend to non-openers on Standard and Premium | Yes, deliverability tools with reporting and revenue attribution |
| Ecommerce and CRM data | Yes, contact management with integrations, plus revenue reporting on the Premium plan | Yes, a customer data platform with deep ecommerce data and more than 350 integrations including Shopify and WooCommerce |
| Integrations and API | Yes, a v3 REST API for contacts and email campaigns with webhooks and OAuth 2.0 | Yes, a REST API with webhooks, SDKs and warehouse syncs |
| AI features | Yes | Yes |
| Deployment | Cloud (SaaS), Browser-based | Cloud (SaaS), Browser-based |
| Support | Phone, Chat | more entries Email helpdesk, Chat, Community forum |
| Onboarding | Not stated | Documentation and knowledge base, Live online demos and webinars, Personal consulting |
| Company size | Freelancers, Small and mid-sized | more entries Freelancers, Small and mid-sized, Enterprise |
| Integrations | Not stated | Shopify, Magento 1.x, Magento 2.x, BigCommerce, WooCommerce, Wix, OpenCart, PrestaShop, Spree, Shift4Shop, Volusion |
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Row where the values differ The small markers point at the lower number, the longer list or the stated feature. They describe the data, they are not a verdict.
The short version
Key Differences
- Starting price Constant Contact From $12 / month Klaviyo Free plan for up to 250 active profiles and 500 email sends a month
- Free trial Constant Contact Free trial available, no credit card required Klaviyo Free plan for up to 250 active profiles and 500 email sends per month, plus $5 of mobile messages a month
- Company size Constant Contact Freelancers, Small and mid-sized Klaviyo Freelancers, Small and mid-sized, Enterprise
- Support Constant Contact Phone, Chat Klaviyo Email helpdesk, Chat, Community forum
- API Constant Contact Yes, a v3 REST API for contacts and email campaigns with webhooks and OAuth 2.0 Klaviyo Yes, a REST API with webhooks, SDKs, warehouse syncs and more than 350 integrations
Every line is one datapoint from the table above, picked automatically. Nothing here is written text.
The trade-offs
Strengths and Limitations
Constant Contact
Strengths
- AI content generator for on-brand emails, texts and social posts
- Automatic resend to non-openers and subject line A/B testing on the paid plans
- v3 REST API with webhooks and OAuth 2.0
- Prepaying for 12 months saves up to 15 percent
Limitations
- Prices scale with the number of contacts
- The Lite plan is limited to one user and one automation template
Klaviyo
Strengths
- Customer data platform with unified profiles behind email, SMS and push
- Real-time segmentation with predictive analytics
- More than 350 integrations including Shopify and WooCommerce
- Free plan for up to 250 active profiles
Limitations
- Pricing scales with the number of active profiles
- The free plan is limited to 500 email sends a month
Plans
Pricing
Constant Contact
- Lite From $12 / month One user, one automation template and basic reporting, with monthly sends up to 10x the number of contacts. Scales with contacts.
- Standard From $35 / month Three users, email scheduling, subject line A/B testing, resend to non-openers, three automation templates, AI campaign building and ten custom segments.
- Premium From $80 / month Unlimited users, unlimited custom automations and segments, dynamic content, revenue reporting, dedicated support and 500 SMS messages a month.
Klaviyo
- Free $0 / month Up to 250 active profiles, 500 email sends a month and $5 of mobile messages a month, with email support for the first 60 days.
- Email Not stated Paid email plan that scales with the number of active profiles, with higher sending allowances.
- Email and SMS Not stated Adds SMS and mobile messaging on top of the email plan, priced by active profiles and message volume.
What users say
Review Scores · opens after launch
Constant Contact
- Ease of use
- Not rated yet
- User interface
- Not rated yet
- Onboarding
- Not rated yet
- Support and service
- Not rated yet
- Value for money
- Not rated yet
- Features
- Not rated yet
No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.
Klaviyo
- Ease of use
- Not rated yet
- User interface
- Not rated yet
- Onboarding
- Not rated yet
- Support and service
- Not rated yet
- Value for money
- Not rated yet
- Features
- Not rated yet
No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.
Where this comes from
Where this comes from
Constant Contact https://www.constantcontact.com · checked against the official source on 2026-08-19
Klaviyo https://www.klaviyo.com · checked against the official source on 2026-09-17
This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.