SMS and WhatsApp marketing platforms · November 2026 Edition
Klaviyo SMS vs Respond.io
Zero of fourteen models named Klaviyo SMS first on the direct prompt; zero named Respond.io. Klaviyo SMS was named by fourteen of the fourteen models and Respond.io by twelve and Klaviyo SMS carries 30 labels and Respond.io 18, so the shares are not directly comparable.
By Klaviyo, Boston, United States, founded 2012. Named in two categories this edition.
Named in three categories this edition.
First-choice share5%5%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.
Negative rate13%0%Negative labels as a share of the product's labels, 0 to 100.
Rank in category#5#6A position in a field of 20; printed, not drawn.
Labels3018A count; the two differ.
The two percentage rows are drawn on one 0 to 100 track, Klaviyo SMS reading right to left. Rank and label count are printed, not drawn.Customer.io was named alongside these two in nine of the fourteen direct answers. Customer.io vs Klaviyo SMS · Customer.io vs Respond.io · Brevo vs Klaviyo SMS
Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all fourteen 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 SMS and WhatsApp marketing platforms page.
By framing
How many of the fourteen models made each the first choice, per way of asking, and how many argued against it.
Klaviyo SMSFirst choices, of fourteen modelsRespond.io
Direct001 against Klaviyo SMS
Paraphrase03
Comparative41
Budget-constrained30
Scale-constrained00
Negative003 against Klaviyo SMS
Bars are first choices, 0 to 14 each sideModels that argued againstA model can name both, so the two sides of a row do not sum to fourteen.
Every model, every framing
The eighty-four answers behind the chart above, one cell each: where Klaviyo SMS and Respond.io stood in it.
| Model | Direct | Paraphrase | Comparative | Budget-constrained | Scale-constrained | Negative |
|---|---|---|---|---|---|---|
| Claude Haiku 4.5 | | | | |||
| GPT-5.4 mini | ||||||
| Gemini 3.5 Flash | | | ||||
| Perplexity Sonar | | | ||||
| Grok 4.20 | | | | |||
| Mistral Small | | | ||||
| DeepSeek V4 Flash | | | ||||
| Llama 4 Maverick | | |||||
| Qwen 3.7 Flash | | | | |||
| Kimi K2 | | |||||
| GLM 4.7 FlashX | | | | |||
| MiniMax M2.5 | | | ||||
| GPT-6 Luna | | |||||
| Muse Glimmer 30B | | | | |
Klaviyo SMS Respond.io first choice named as an alternative argued againstblank: not namedEach cell is one answer, Klaviyo SMS on the left and Respond.io on the right.The direct prompt
The plain question, one answer per model, grouped by where Klaviyo SMS and Respond.io stood in it.
Neither was named
14 of 14 modelsThe answer made no first choice from these two in this category.Claude Haiku 4.5Customer.io alternatives: ActiveCampaign, Heymarket, Salesmsg, SlickText, Vero
GPT-5.4 miniTwilio Programmable Messaging alternatives: Braze, SimpleTexting
Gemini 3.5 FlashSalesmsg alternatives: Customer.io, Mogli, Sakari, TextUs
Perplexity SonarCustomer.io alternatives: ActiveCampaign, SlickText
Grok 4.20Customer.io alternatives: ActiveCampaign, Braze, Iterable
Mistral SmallAttentive, Twilio Programmable Messaging alternatives: Insider
DeepSeek V4 FlashCustomer.io alternatives: ActiveCampaign, HubSpot Marketing Hub, Twilio Programmable Messaging
Llama 4 MaverickCustomer.io
Qwen 3.7 FlashHubSpot Marketing Hub alternatives: Customer.io, Marigold
Kimi K2Salesmsg alternatives: EZ Texting, SimpleTexting
GLM 4.7 FlashXVibes alternatives: SimpleTexting, SlickText, TrueDialog
MiniMax M2.5Customer.io, OneSignal alternatives: Brevo, Sinch, SlickText
GPT-6 LunaMogli, Sakari alternatives: HubSpot's native SMS add-on
Muse Glimmer 30BCustomer.io alternatives: Salesmsg
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 SMS leads by two points.
Klaviyo SMS3%#9 of 17Respond.io2%#12 of 17Mid-marketThe figures above
Level: the same share of first choices.
Klaviyo SMS5%#5 of 20Respond.io5%#6 of 20Enterprise
Level: the same share of first choices.
Klaviyo SMS0%#13 of 14Respond.io0%#– of 14What the models said about Klaviyo SMS
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Six of eight in this category shown.
“Many buyers report frustration with high costs and missing features, especially with platforms like Attentive, Postscript, and Klaviyo SMS.” Mistral Small · negative prompt · soft negative
“with Klaviyo SMS beside them — draw complaints about cost, getting data in, building flows, support, missing features and attribution” Muse Glimmer 30B · negative prompt · soft negative
“Billing traps around "active profiles"... Strong overall (4+ stars), but watch billing closely.” Grok 4.20 · negative prompt · soft negative
“The best SMS marketing platform for a company with a limited budget is Klaviyo, which offers a starting price of $20/mo” Llama 4 Maverick · budget prompt · first choice
“Unbeatable for e-commerce — it unifies customer data with SMS/WhatsApp campaigns and automations” DeepSeek V4 Flash · comparative prompt · first choice
“For North American E-Commerce Brands: Choose Klaviyo (if unifying email and SMS)” Gemini 3.5 Flash · comparative prompt · first choice
What the models said about Respond.io
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Three of four in this category shown.
“### 1. Respond.io ... Best For: Conversational B2B sales, lead qualification, and team collaboration.” Gemini 3.5 Flash · paraphrase prompt · first choice
“For WhatsApp: folk CRM or Respond.io are excellent” Mistral Small · paraphrase prompt · first choice
“Ratings: Highly recommended for scalability.” Grok 4.20 · comparative prompt · first choice
Also compared
Customer.io vs Klaviyo SMSCustomer.io vs Respond.ioBrevo vs Klaviyo SMSBrevo vs Respond.ioSimpleTexting vs Klaviyo SMSSimpleTexting vs Respond.ioTwilio Programmable Messaging vs Klaviyo SMSTwilio Programmable Messaging vs Respond.ioKlaviyo SMS vs OmnisendKlaviyo SMS vs WATIRespond.io vs OmnisendRespond.io vs WATIAll twenty-eight head-to-head pages and the full SMS & WhatsApp standing
Comparisons are drawn for the top eight products in each category, each against each. The output is the models' output; nothing here is a recommendation by the index.