Klaviyo vs CartStack
Klaviyo and CartStack target ecommerce teams but serve different needs. Klaviyo is a full-featured AI-powered email/SMS CRM and personalization platform; CartStack focuses tightly on recovering abandoned carts and on-site conversion.
Last updated
The summary above and the “Which should you choose?” section are written with AI from our two listings. The tables and answers come straight from the listings. Prices and features change, so check each vendor's website before you decide. How we use AI
At a glance
| Listing | Klaviyo | CartStack |
|---|---|---|
| Starting price | Free plan | Contact for pricing |
| Free plan | Yes | No |
| Free trial | No | Yes |
| Works with | Shopify, WooCommerce, BigCommerce, Salesforce Commerce Cloud | Shopify, WooCommerce, BigCommerce |
| Features | 17 features listed | 8 features listed |
| Integrations | 8 integrations listed | 8 integrations listed |
| Public API | Yes | Yes |
| Business size | Startup, SMB, Mid-Market, Enterprise | Startup, SMB, Mid-Market |
| Listing data checked | Sep 25, 2026 | Aug 28, 2026 |
Pricing compared
Features compared
Both list 5 of these features. 12 are listed only for Klaviyo. 3 are listed only for CartStack.
| Feature | Klaviyo | CartStack |
|---|---|---|
| API | Listed | Listed |
| Listed | Listed | |
| Multi-channel | Listed | Listed |
| SMS | Listed | Listed |
| Templates | Listed | Listed |
| AI | Listed | Not listed |
| Analytics | Listed | Not listed |
| Automation | Listed | Not listed |
| Collaboration | Listed | Not listed |
| Dashboard | Listed | Not listed |
| Drag & Drop | Listed | Not listed |
| GDPR Compliant | Listed | Not listed |
| Import | Listed | Not listed |
| Mobile | Listed | Not listed |
| Personalization | Listed | Not listed |
| Reporting | Listed | Not listed |
| Segmentation | Listed | Not listed |
| A/B Testing | Not listed | Listed |
| Real-time | Not listed | Listed |
| Webhook | Not listed | Listed |
Platforms and integrations
Ecommerce platforms
| Platform | Klaviyo | CartStack |
|---|---|---|
| BigCommerce | Listed | Listed |
| Shopify | Listed | Listed |
| WooCommerce | Listed | Listed |
| Salesforce Commerce Cloud | Listed | Not listed |
Integrations
Both list 4 of these integrations. 4 are listed only for Klaviyo. 4 are listed only for CartStack.
| Integration | Klaviyo | CartStack |
|---|---|---|
| Google Analytics | Listed | Listed |
| Shopify | Listed | Listed |
| WooCommerce | Listed | Listed |
| Zapier | Listed | Listed |
| Listed | Not listed | |
| Listed | Not listed | |
| Mailchimp | Listed | Not listed |
| Slack | Listed | Not listed |
| BigCommerce | Not listed | Listed |
| Klaviyo | Not listed | Listed |
| PayPal | Not listed | Listed |
| Stripe | Not listed | Listed |
More details
| Detail | Klaviyo | CartStack |
|---|---|---|
| Pricing model | Free plan with core features; paid plans scale based on number of contacts and channel usage (email, SMS, etc.); Enterprise pricing available for large organizations. | Not publicly listed on the provided page; contact vendor for pricing. Free trial is advertised on the site. |
| Support | Email, live chat, dedicated Slack channel for some plans, professional services and onboarding, partner/agency network Varies by plan: Standard: weekdays 24/5, no weekend coverage; Professional: weekdays 24/5, weekends local business hours; Enterprise: 24/7 weekdays and weekends. | Contact form and demo request on the website, customer login for account support, and documentation/integration pages; Zapier and API are available for integrations. |
| Security and compliance | SOC 2 Type II certified, GDPR support with Data Processing Agreement and self-service tools, EU–US Data Privacy Framework and Standard Contractual Clauses supported; offers EU and US data residency options. | Site contains links to GDPR and CCPA policy pages (GDPR and CCPA links present in footer), indicating attention to data privacy compliance information on the official website. |
| Product maturity | Mature, widely adopted platform with large customer base (205,000+ brands) and enterprise features, professional services, and extensive integrations. | Mature, ecommerce-focused recovery product with a broad feature set (multichannel campaigns, on-site tools, reporting and integrations) and years of presence as indicated by site footer. |
| Not a good fit for | Not a good fit for organizations that need a purely free, limited-contact email tool or those unwilling to manage shared GDPR responsibilities. | Not a good fit for businesses that do not sell online or do not have a website to integrate recovery scripts. |
Pros and cons
From each app's App4Ecom listing.
Klaviyo
Pros
- Unifies customer data into a real-time CDP for consistent cross-channel personalization
- AI-driven agents (Composer and Customer Agent) that automate campaign creation and customer support
- Supports omnichannel messaging including email, SMS, RCS, WhatsApp, and mobile push
- 350+ pre-built integrations and developer APIs to connect your tech stack
- Enterprise-grade throughput and uptime claims (high events, API calls, and 99.95% uptime)
Cons
- Advanced support tiers, faster response times, and enterprise SLAs are gated behind Professional or Enterprise packages
- Pricing scales based on number of contacts and channel usage, which can increase costs for large lists
- GDPR compliance is a shared responsibility; customers must manage how they collect and use customer data
CartStack
Pros
- Supports multichannel recovery: email, SMS, push, and on-site tools for broader reach
- Quick integrations with major ecommerce platforms and Zapier, plus webhooks and API
- Real-time email capture and abandoned session replays to improve recovery accuracy
- Built-in conversion tools (exit-intent, delayed popups, conversion nudges) and A/B testing
- Enriched contact reports and product recommendations to increase recovery value
Cons
- No visible public pricing on the provided page; requires contacting vendor for pricing details
- Not positioned as a full marketing automation suite outside of recovery use cases
- Advanced features (API/webhooks/session replay) may require technical setup
- No explicit mobile app or desktop client mentioned; primarily website-integrated
Which should you choose?
Choose Klaviyo if you need a broad, AI-enabled email/SMS CRM and personalization across channels; choose CartStack if your primary goal is recovering abandoned carts and improving on-site capture.
Klaviyo: Klaviyo is best for brands that need a scalable, AI-enabled email and SMS CRM with deep personalization, automation and analytics across channels.
CartStack: CartStack is best for ecommerce merchants focused on abandoned-cart recovery and on-site email capture who want quick integrations and measurable ROI from recovery campaigns.
Frequently asked questions
Do Klaviyo and CartStack have a free plan?
Klaviyo lists a free plan; CartStack doesn't. CartStack offers a free trial.
Which platforms do Klaviyo and CartStack work with?
Klaviyo works with Shopify, WooCommerce, BigCommerce and Salesforce Commerce Cloud. CartStack works with Shopify, WooCommerce and BigCommerce. Both work with Shopify, WooCommerce and BigCommerce.
What features do Klaviyo and CartStack have in common?
Both list API, Email, Multi-channel, SMS and Templates. Only Klaviyo lists AI, Analytics, Automation, Collaboration, Dashboard, Drag & Drop and 6 more. Only CartStack lists A/B Testing, Real-time and Webhook.
Do Klaviyo and CartStack have an API?
Yes, both list a public API.
Where this data comes from
Klaviyo
Listing data refreshed September 25, 2026.
- klaviyo.com Official website
- klaviyo.com/success/premium-support Official website
CartStack
Listing data refreshed August 28, 2026.
- cartstack.com Official website
- cartstack.com/integrations/ecommerce-platforms Official website