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Ecommerce marketing · September 2026 Edition

Klaviyo vs Omnisend

One of twelve models named Klaviyo first on the direct prompt; zero named Omnisend. Klaviyo was named by eleven of the twelve models and Omnisend by eleven and Klaviyo carries 45 labels and Omnisend 29, so the shares are not directly comparable.

Klaviyo

accepted challenger

Boston, United States, founded 2012. Named in fifteen categories this edition.

Omnisend

accepted challenger

Lithuania, founded 2014. Named in six categories this edition.

First-choice share18%10%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.
Negative rate18%7%Negative labels as a share of the product's labels, 0 to 100.
Rank in category#2#3A position in a field of 10; printed, not drawn.
Labels4529A count; the two differ.
The two percentage rows are drawn on one 0 to 100 track, Klaviyo reading right to left. Rank and label count are printed, not drawn.HubSpot Marketing Hub was named alongside these two in nine of the twelve direct answers. HubSpot Marketing Hub vs Klaviyo · HubSpot Marketing Hub vs Omnisend

Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all twelve models, for a mid-market B2B company; rank is within the category; every quote names the model and the prompt it came from. Both figures come from the ecommerce marketing page.

By framing

How many of the twelve models made each the first choice, per way of asking, and how many argued against it.
KlaviyoFirst choices, of twelve modelsOmnisend
Direct10
Paraphrase101 against Klaviyo · 1 against Omnisend
Comparative84
Budget-constrained352 against Klaviyo
Scale-constrained40
Negative115 against Klaviyo · 1 against Omnisend
Bars are first choices, 0 to 12 each sideModels that argued againstA model can name both, so the two sides of a row do not sum to twelve.

The direct prompt

The plain question, one answer per model, grouped by where Klaviyo and Omnisend stood in it.

Klaviyo first, Omnisend not the choice

1 of 12 modelsOmnisend was named in the answer but not as the choice, or not at all.
GLM 4.7 FlashXKlaviyo alternatives: BigCommerce, HubSpot Marketing Hub, Shopify

Neither was the first choice, one was named

5 of 12 modelsThe answer put something else first and named one of the two as an alternative.
Gemini 3.5 FlashHubSpot Marketing Hub alternatives: ActiveCampaign, Klaviyo, Salesforce Marketing Cloud Account Engagement
Grok 4.1 FastHubSpot Marketing Hub alternatives: ActiveCampaign, BigCommerce B2B Edition, Klaviyo, Salesforce Marketing Cloud Account Engagement
Mistral SmallBigCommerce B2B Edition, HubSpot Marketing Hub alternatives: ActiveCampaign, Klaviyo, Shopify, VTEX
DeepSeek V4 FlashHubSpot Marketing Hub alternatives: ActiveCampaign, Adobe Commerce, BigCommerce B2B Edition, Klaviyo, Shopify
Kimi K2BigCommerce B2B Edition, HubSpot Marketing Hub alternatives: Klaviyo

Neither was named

6 of 12 modelsThe answer made no first choice from these two in this category.
Claude Haiku 4.5BigCommerce B2B Edition, HubSpot Marketing Hub alternatives: OroCommerce
GPT-5.4 miniHubSpot Marketing Hub alternatives: Adobe Commerce, BigCommerce, Salesforce B2B Commerce
Perplexity SonarBigCommerce B2B Edition alternatives: Adobe Commerce, OroCommerce, Shopify
Llama 4 MaverickBigCommerce alternatives: SCAYLE, Shopify, Shopware, VTEX
Qwen 3.7 FlashBigCommerce B2B Edition, HubSpot Marketing Hub alternatives: ActiveCampaign, Shopify
MiniMax M2.5BigCommerce B2B Edition alternatives: Adobe Commerce, SAP Commerce, Shopify Plus with B2B Suite

Bold names in an answer are the products the judge labeled a first choice; a model naming several gives each of them that label. The full answer text for every row is in the record.

By buyer segment

The same question asked on behalf of a different buyer. Each standing is computed within its segment and they are never added together. The figures above are the mid-market standing, which is the one the category orders by.
Small business
Klaviyo leads by four points.
Klaviyo17%#1 of 12
Omnisend13%#4 of 12
The full small business standing →
Mid-marketThe figures above
Klaviyo leads by eight points.
Klaviyo18%#2 of 10
Omnisend10%#3 of 10
The full mid-market standing →
Enterprise
Klaviyo leads by four points.
Klaviyo4%#7 of 12
Omnisend0%#– of 12
The full enterprise standing →

What the models said about Klaviyo

Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Four of four in this category shown.

“Klaviyo — The Most Controversial Right Now ... Trustpilot rating: 1.9/5 ... the worst rating of any major platform researched” DeepSeek V4 Flash · negative prompt · hard negative
“The market leader for Shopify/Shopify Plus environments, but highly capable on other platforms. Incredibly strong for segmentation, ease of use, and fast time-to-value” Gemini 3.5 Flash · scale prompt · first choice
“Klaviyo | Mid-market to Enterprise Brands | Deep native Shopify integrations, highly granular behavioral segmentation, and predictive analytics.” Qwen 3.7 Flash · comparative prompt · first choice
“Klaviyo ⭐ *Best for Data-Driven Ecommerce* ... Most sophisticated predictive analytics and customer data platform for ecommerce” Mistral Small · comparative prompt · first choice

What the models said about Omnisend

Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Four of four in this category shown.

“Omnisend | Consumer-focused; lacks B2B lead nurturing features” Kimi K2 · paraphrase prompt · hard negative
“While generally well-liked (4.6/5 rating), be cautious about: Poor deliverability” DeepSeek V4 Flash · negative prompt · soft negative
“the best ecommerce marketing platform is Omnisend (free plan for up to 250 contacts and 500 emails/month, paid plans from $16/month)” Grok 4.1 Fast · budget prompt · first choice
“Omnisend ⭐ *Best Value for Multichannel Ecommerce* ... Best ROI-to-price ratio with global SMS coverage and built-in AI” Mistral Small · comparative prompt · first choice
Also compared
HubSpot Marketing Hub vs KlaviyoHubSpot Marketing Hub vs OmnisendThe full ecommerce marketing standing

Comparisons are drawn for the top three products in each category. The output is the models' output; nothing here is a recommendation by the index.