The use case: how Buffer deploys Customer.io
Buffer uses Customer.io with Segment and Mixpanel to send event-based, personalized lifecycle emails. They branch journeys by connected social network, use Liquid for dynamic content, segment by plan type, and run holdout tests.
More reported results
Figures published in Customer.io’s case study. They are not independently measured by usedby.
This personalized approach has paid off, driving a 28% increase in click-through rates for customers in tailored branches of the campaign
By making emails more relevant to individual users, Buffer has seen a 22% increase in email open-to-conversion rates.
In the customer’s words
Customer.io has become the heartbeat of our lifecycle marketing strategy, empowering us to communicate with users in a way that feels genuinely relevant and personal.Other AI tools used by Buffer
Other public relationships recorded on usedby.
Explore Buffer’s AI stack
Other companies using Customer.io
Customers across industries, with public evidence.
Cosentino's Food GroupConfirmed
Georgia AquariumConfirmed
GuestReadyConfirmed
Kinnect.ClubConfirmed
KlarConfirmed
LivestormConfirmedGo straight to the source
Based on Customer.io’s published case study. We check the public evidence; the results are reported by the vendor.
customer.io- Source published
- Dec 12, 2024
- Last checked
- Nov 12, 2026
Open source capture What the story claims, and what we checked
What we compared with the page.
- The figure: 41.5%Checked
The figure is on the page; its label is our wording.
- The passage quoted aboveChecked
Copied word for word from the page, near the name of Buffer.
- The publication dateChecked
Read from the page’s own metadata, never guessed.
- Buffer uses Customer.ioChecked
Confirmed line.
- The result itselfNot checked
We quote it; we did not measure it.
Buffer uses event data to segment customers and create customized email journeys. For example, customers who connect TikTok receive tailored tips and resources specific to the platform, while Threads users get strategies for text-based content.