Customer.io vs Mailchimp:Which is more popular?
In September 2026, Mailchimp had more branded searches than Customer.io among campaign management platforms worldwide. Mailchimp had about 1.2 million branded searches, while Customer.io had 12,300. Mailchimp made up 29.4% of all campaign management platform searches we track, and Customer.io accounted for 0.29%. When we asked ChatGPT and Google AI Overviews about campaign management platforms, Mailchimp appeared in three of the five answers and Customer.io in none.
Who do people search for more?
Mailchimp, about 100 searches for every 1 for Customer.io
Who does AI mention more?
Mailchimp, mentioned in 3 of 5 answers, Customer.io in 0
Who does AI recommend more?
Mailchimp, the only one of the two named
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Top campaign management platforms in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, Mailchimp 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 did not appear in any of the five answers.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
HubSpot1st
ActiveCampaign2nd- Mailchimp3rd
Asana4th
Klaviyo5th
Adobe Marketo Engage6th
Customer.io–
Pardot–
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
- HubSpot5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- ActiveCampaign5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- Klaviyo4 of 5Named in 2 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- Mailchimp3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- Asana3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- Adobe Marketo Engage3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- Customer.io0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- Pardot0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about campaign management platforms
5 answers
Asked ChatGPT
“Which campaign management platform should I use?”
Asked ChatGPT
“What are the best campaign management platforms?”
Asked ChatGPT
“What's the best campaign management platform for marketing teams?”
Searched Google, AI Overview
“campaign management platforms”
Searched Google, AI Overview
“marketing campaign software”
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 Mailchimp more popular in search?
This chart shows how often people search Google for Customer.io and Mailchimp by name. Each line represents a brand's share of searches for all eight campaign management platforms we track, month by month, from English-language searches worldwide.
Share of searches by month for Mailchimp, Customer.io. The figures are in the table below the chart.
View monthly share of searches table
| Month | HubSpot | Mailchimp | Asana | Klaviyo | ActiveCampaign | Customer.io | Pardot | Adobe Marketo Engage |
|---|---|---|---|---|---|---|---|---|
| Oct 2025 | 30.4% | 30% | 30.7% | 6.1% | 2.2% | 0.25% | 0.36% | 0.03% |
| Nov 2025 | 29.5% | 35.8% | 24.7% | 7.2% | 2.1% | 0.24% | 0.35% | 0.02% |
| Dec 2025 | 28.2% | 33.9% | 28.4% | 6.9% | 2% | 0.28% | 0.33% | 0.03% |
| Jan 2026 | 32.4% | 32% | 26.7% | 6.4% | 1.9% | 0.26% | 0.31% | 0.02% |
| Feb 2026 | 31.6% | 31.2% | 26.4% | 7.7% | 2.3% | 0.32% | 0.38% | 0.03% |
| Mar 2026 | 32.4% | 31.9% | 26.7% | 6.4% | 1.9% | 0.26% | 0.31% | 0.03% |
| Apr 2026 | 36.3% | 29.3% | 24.7% | 7.2% | 1.8% | 0.29% | 0.35% | 0.02% |
| May 2026 | 31.8% | 31.4% | 26.4% | 7.8% | 1.9% | 0.32% | 0.31% | 0.03% |
| Jun 2026 | 36.4% | 29.3% | 24.6% | 7.3% | 1.8% | 0.29% | 0.29% | 0.03% |
| Jul 2026 | 33.8% | 27.5% | 28.1% | 8.3% | 1.6% | 0.33% | 0.33% | 0.03% |
| Aug 2026 | 33.8% | 27.5% | 28.1% | 8.3% | 1.7% | 0.34% | 0.33% | 0.03% |
| Sep 2026 | 36.4% | 29.4% | 24.9% | 7.3% | 1.5% | 0.29% | 0.29% | 0.03% |
How has the Customer.io and Mailchimp comparison changed over the last 12 months?
3 findings
- Mailchimp was ahead of Customer.io in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, Customer.io’s share of searches among campaign management platforms worldwide moved from 0.25% to 0.29%, and its estimated monthly branded searches held steady at 12.3K.
- Across the 12 months ending September 2026, Mailchimp’s share of searches among campaign management platforms worldwide moved from 30% to 29.4%, and its estimated monthly branded searches moved from 1.5M to 1.2M.
How did search popularity change for campaign management platforms worldwide in September 2026?
1 change
In September 2026, Mailchimp overtook Asana to rank 2nd among campaign management platforms worldwide, with 29.4% of the searches.
How are branded searches counted?
13 search terms
Brandwave collects information about searches that people make online using Customer.io’s and Mailchimp’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
Mailchimp
7 branded search terms
- email marketing mailchimp
- intuit mailchimp
- Mailchimp
- mailchimp app
- mailchimp email templates
- mailchimp template
- mailchimp templates
Other head-to-heads among campaign management platforms
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