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
Email Marketing Comparison
Klaviyo vs. Sender
At a glance
At a glance
Best for
Best for small businesses that want email and SMS together on a budget, with a generous free plan and pricing that scales with the list.
- Freelancers
- Small and mid-sized
- Enterprise
Cataleo does not name a winner. Both statements come from the vendors themselves.
Full Comparison
| Criterion | Klaviyo | Sender |
|---|---|---|
| Starting price | 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. | From $7 / month Standard plan for up to 1,000 subscribers and 12,000 emails per month; the price scales with the subscriber count. A Free Forever plan covers up to 2,500 subscribers and 15,000 emails per month. |
| Free trial | Free plan for up to 250 active profiles and 500 email sends per month, plus $5 of mobile messages a month | Free Forever plan for up to 2,500 subscribers and 15,000 emails per month, with Sender branding |
| API | Yes, a REST API with webhooks, SDKs, warehouse syncs and more than 350 integrations | Not stated |
| Hosting | Cloud (SaaS) | Cloud (SaaS) |
| Made in | United States | Not stated |
| Campaign types | Yes, email campaigns with SMS and push from the same customer profiles | Yes, email newsletters and campaigns, plus SMS on paid plans and transactional email, with A/B testing |
| Automation and journeys | Yes, automation flows triggered by customer behaviour and events | Yes, unlimited marketing automation |
| Segmentation and personalisation | Yes, real-time segmentation with predictive analytics on unified customer profiles | Yes, unlimited segmentation for targeted messaging |
| Templates and editor | Yes, a drag-and-drop email editor with templates | Yes, a drag-and-drop builder with 1,600+ mobile-responsive templates and a custom HTML editor |
| Deliverability and testing | Yes, deliverability tools with reporting and revenue attribution | Yes, with 24/7 IP monitoring and sender-reputation tracking, plus A/B testing for subject lines, content and send times |
| Ecommerce and CRM data | Yes, a customer data platform with deep ecommerce data and more than 350 integrations including Shopify and WooCommerce | Yes, integrations for Shopify, WooCommerce, PrestaShop and WordPress |
| Integrations and API | Yes, a REST API with webhooks, SDKs and warehouse syncs | Yes, integrations including WordPress, WooCommerce, Shopify, PrestaShop and Zapier |
| AI features | stated Yes | No |
| Deployment | Cloud (SaaS), Browser-based | Cloud (SaaS), Browser-based |
| Support | more entries Email helpdesk, Chat, Community forum | Chat, 24/7 |
| Onboarding | Documentation and knowledge base, Live online demos and webinars, Personal consulting | Not stated |
| Company size | Freelancers, Small and mid-sized, Enterprise | Freelancers, Small and mid-sized, Enterprise |
| Integrations | more entries Shopify, Magento 1.x, Magento 2.x, BigCommerce, WooCommerce, Wix, OpenCart, PrestaShop, Spree, Shift4Shop, Volusion | WordPress, WooCommerce, Shopify, PrestaShop, Zapier |
Add a tool
Adds a column to the table, from the tools in this category.
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 Klaviyo Free plan for up to 250 active profiles and 500 email sends a month Sender From $7 / month
- Free trial Klaviyo Free plan for up to 250 active profiles and 500 email sends per month, plus $5 of mobile messages a month Sender Free Forever plan for up to 2,500 subscribers and 15,000 emails per month, with Sender branding
- Support Klaviyo Email helpdesk, Chat, Community forum Sender Chat, 24/7
- AI features Klaviyo Yes Sender No
- Campaign types Klaviyo Yes, email campaigns with SMS and push from the same customer profiles Sender Yes, email newsletters and campaigns, plus SMS on paid plans and transactional email, with A/B testing
Every line is one datapoint from the table above, picked automatically. Nothing here is written text.
The trade-offs
Strengths and Limitations
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
Sender
Strengths
- Free plan for up to 2,500 subscribers and 15,000 emails per month
- Email plus SMS from paid plans, with unlimited automation and segmentation
- 1,600+ responsive templates and a drag-and-drop builder
- Ecommerce integrations for Shopify, WooCommerce and PrestaShop
Limitations
- The free plan carries Sender branding
- SMS is only available on paid plans
Plans
Pricing
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.
Sender
- Free $0 / month Up to 2,500 subscribers and 15,000 emails per month, with Sender branding.
- Standard From $7 / month Up to 1,000 subscribers and 12,000 emails per month; removes branding and adds SMS and A/B testing. Scales with subscriber count.
- Professional From $14 / month Up to 1,000 subscribers and 24,000 emails per month; adds advanced automation, more seats and priority support. Scales with subscriber count.
- Enterprise Not stated Unlimited emails, a dedicated success manager, SSO and phone support, quoted by sales.
What users say
Review Scores · opens after launch
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. Nothing has been published here yet, and no score is shown. How a review is checked before it appears is described below.
Sender
- 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. Nothing has been published here yet, and no score is shown. How a review is checked before it appears is described below.
How we check reviews
Before sending, the author has to confirm three things: that they have used the product themselves, that they work neither for the vendor nor for a competitor, and that nobody is paying them for the review. We also ask whether the vendor invited them to write it. That answer is required, either answer is accepted, and it stays with the review.
Every review is read by a person before it appears. An email address is required and is confirmed: we send a link to it, and a review does not reach us until the author opens that link, so a review has a sender who was reachable at least once rather than being anonymous. Where what somebody writes needs backing, we ask them for evidence that they used the product, and a review that does not get it is not published. We publish positive and negative reviews alike, we pay nothing and offer nothing for a review, and we accept none that was bought or incentivised.
What we cannot do is verify a purchase. There is no shop here and no account, so whether the author really used the tool rests on their own declaration, on whatever we ask them for, and on the plausibility of what they write. We say so rather than implying a check that does not exist.
A vendor cannot buy a review, and cannot have one removed or changed because they dislike it. We remove or edit a review only if it breaks our rules or the law, for example a false statement of fact. Paid placement has no effect on which reviews appear or on any score.
Where this comes from
Where this comes from
Klaviyo https://www.klaviyo.com · checked against the official source on 2026-09-17
Sender https://www.sender.net · checked against the official source on 2026-08-22
This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.