The use case: how Notion deploys Customer.io
Notion's lifecycle marketing team uses Customer.io to send localized, personalized onboarding and feature-adoption emails to a global user base. They also run A/B tests on subject lines to inform product launch positioning.
More reported results
Figures published in Customer.io’s case study. They are not independently measured by usedby.
This personalized campaign achieved an impressive 49-51% open rate and a 1-1.5% click-through rate (CTR), demonstrating the effectiveness of targeted, user-centric messaging.
The results were massive—simply repositioning a single word in one of the subject lines led to a 20% increase in open rates!
In the customer’s words
Relevance and personalization are non-negotiable today! Customer.io made scaling personalization for millions of users simple. Now, we can give new users a highly personalized onboarding experience regardless of location or language.Other AI tools used by Notion
Other public relationships recorded on usedby.
Explore Notion’s AI stack
Other companies using Customer.io
Customers across industries, with public evidence.
BufferConfirmed
Cosentino's Food GroupConfirmed
Georgia AquariumConfirmed
GuestReadyConfirmed
Kinnect.ClubConfirmed
KlarConfirmedGo 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
- Sep 18, 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: 6-7%Checked
Printed word for word on the page, near the name of Notion.
- The passage quoted aboveChecked
Copied word for word from the page, near the name of Notion.
- The publication dateChecked
Read from the page’s own metadata, never guessed.
- Notion uses Customer.ioChecked
Confirmed line.
- The result itselfNot checked
We quote it; we did not measure it.
Using Customer.io, the team set up localized onboarding campaigns tailored to the recipient's location and language, specifically targeting the Korean and French markets. These campaigns deeply resonated with users worldwide, fostering better engagement and leading to a notable lift in conversion rates by 6-7%.