Brandwave

Customer.io vs Klaviyo:Which is more popular?

In September 2026, Klaviyo had more branded searches than Customer.io among customer engagement platforms worldwide. Klaviyo had about 306,000 branded searches, while Customer.io had 12,300. Klaviyo made up 71.4% of all customer engagement platform searches we track, and Customer.io accounted for 2.9%. When we asked ChatGPT and Google AI Overviews about customer engagement platforms, Klaviyo appeared in three of the five answers and Customer.io in two. Klaviyo was mentioned before Customer.io in two out of three answers that named either.

Among customer engagement platforms worldwide in September 2026

Who do people search for more?

Klaviyo, about 25 searches for every 1 for Customer.io

Klaviyo 306K searchesCustomer.io 12.3K searches

Who does AI mention more?

Klaviyo, mentioned in 3 of 5 answers, Customer.io in 2

Klaviyo in 3 of 5Customer.io in 2 of 5

Who does AI recommend more?

Klaviyo, named ahead of Customer.io in 2 of 3 answers

Klaviyo first in 2Customer.io first in 1

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Top customer engagement platforms in ChatGPT and Google AI Overviews

In three ChatGPT questions and two Google AI Overviews, Klaviyo was mentioned in three out of five: in two of the three ChatGPT answers and in one of the two Google AI Overviews. Customer.io was mentioned in two out of five: in one of the three ChatGPT answers and in one of the two Google AI Overviews. Klaviyo was listed before Customer.io in two out of three answers that named either.

Most recommended by AI

Brands get a higher ranking if they are mentioned earlier in the answers.

  1. Braze1st
  2. Intercom2nd
  3. Klaviyo3rd
  4. Customer.io4th
  5. OneSignal–
  6. CleverTap–
  7. MoEngage–
  8. Airship–
  9. Iterable–
  10. Insider–

Mentioned by AI

Each dot is one answer, filled in when that answer mentions the brand.

  • Braze4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Intercom4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Klaviyo3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Customer.io2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • OneSignal0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • CleverTap0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • MoEngage0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • Airship0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • Iterable0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • Insider0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers

See every answer about customer engagement platforms

5 answers

Not named in any answer:

Brands are shown in the order each answer named them. The survey took place in the United States on October 20, 2026.

Is Customer.io or Klaviyo more popular in search?

This chart shows how often people search Google for Customer.io and Klaviyo by name. Each line represents a brand's share of searches for all ten customer engagement platforms we track, month by month, from English-language searches worldwide.

Customer.io and Klaviyo among customer engagement platforms worldwide, by month

Share of searches by month for Klaviyo, Customer.io. The figures are in the table below the chart.

View monthly share of searches table
MonthKlaviyoOneSignalCleverTapMoEngageCustomer.ioBrazeAirshipIterableInsiderIntercom
Oct 202569.7%14.1%5.1%6.1%2.8%1.4%0.45%0.15%0.21%0%
Nov 202570.3%14.2%5.1%6.2%2.3%1.2%0.37%0.13%0.19%<0.01%
Dec 202568.6%14%5%7.4%2.8%1.4%0.42%0.14%0.2%<0.01%
Jan 202670.4%14.3%5.2%5.1%2.8%1.5%0.43%0.16%0.19%<0.01%
Feb 202672.3%12.1%5.3%5.2%2.9%1.4%0.45%0.14%0.16%<0.01%
Mar 202670.3%14.3%5.1%5.1%2.8%1.4%0.58%0.17%0.17%<0.01%
Apr 202670.6%14.3%5.2%5.1%2.8%1.2%0.53%0.14%0.15%<0.01%
May 202671.1%14.1%5.1%5%2.8%1.2%0.48%0.17%0.11%<0.01%
Jun 202669.9%13.8%5.1%6.2%2.8%1.3%0.56%0.15%0.11%<0.01%
Jul 202671.4%13.3%5.2%5.2%2.9%1.2%0.48%0.15%0.1%0%
Aug 202671.5%13.3%5.2%5.2%2.9%1.3%0.37%0.13%0.09%<0.01%
Sep 202671.4%13.3%5.2%5.2%2.9%1.3%0.39%0.13%0.08%<0.01%

How has the Customer.io and Klaviyo comparison changed over the last 12 months?

3 findings

How did search popularity change for customer engagement platforms worldwide in September 2026?

0 changes

Neither Customer.io nor Klaviyo moved beyond provider rounding among customer engagement platforms in September 2026.

How are branded searches counted?

13 search terms

Brandwave collects information about searches that people make online using Customer.io’s and Klaviyo’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.

Customer.io

6 branded search terms

  • customer io
  • customer io crm
  • customer io email
  • customer io sms
  • customer io whatsapp
  • Customer.io

Klaviyo

7 branded search terms

  • klaviyo
  • klaviyo app
  • klaviyo crm
  • klaviyo email marketing
  • klaviyo marketing
  • klaviyo whatsapp
  • klaviyocom

How the Brand Demand Index is measured

Other head-to-heads among customer engagement platforms

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