people · May 21, 2026
Customer.io adoption rate drops 0.01% in email marketing market share
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Customer.io recorded a 0.01% drop in adoption rate two days ago according to Ramp vendor data. The platform holds 5% overall adoption and 3% first-time adopter share in email marketing software. Key details include 9% competitor switch rate toward ActiveCampaign and comparisons with Klaviyo at 22%. Customer.io maintained 5% adoption in the email marketing category as of May 2026.
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