“I am a big fan of customer.io to create marketing automation flows as we are in a high volume business and one-to-one communication isn’t always feasible, yet we do love to be proactive.”
Lifecycle EmailMaker says so +1 · source ↗
Customer.io
Messaging automation platform for lifecycle email, push, SMS, and in-app messages driven by user behavior data.
Where it fits
How Customer.io itself is built
9 tools, from its own code, website and Product Hunt page.
Who uses it
47 makers' products, each linked to the source that shows it, and 5 open-source projects that declare it in their code.
“Very easy to get started with, excellent onboarding with multiple workflow options. Exactly what we needed from a customer engagement platform.”
Lifecycle EmailMaker says so +1 · source ↗“Listed in their tool stack on Starter Story (email)”
Lifecycle EmailMaker says so · source ↗“Customer.io for email marketing and customer onboarding Active Campaign for email marketing Segment to integrate multiple tools …”
Lifecycle EmailMaker says so · source ↗“Customer.io is the customer engagement platform built for lifecycle marketing, with segmentation, behavioral triggers, and multi-channel messaging across email, SMS, push, and in-app all in one place. We chose it because it lets you send based on what customers actually do, not just a schedule, and the IFTTT integration means real-world activity can feed directly into your campaigns.”
Lifecycle EmailMaker says so · source ↗“Good connectivity through the MCP server, which allows you to perform simple and advanced data manipulation, highly recommended.”
Lifecycle EmailMaker says so · source ↗“CustomerIO - They make building communication and email flows super easy and have given me (as the non-technical cofounder) far more control over our customer comms.”
Lifecycle EmailMaker says so · source ↗“We use Customer.io to handle all our messaging. It helps us send targeted emails, push notifications, and SMS to keep our users engaged based on how they interact with our app.”
Lifecycle EmailMaker says so · source ↗“Listed in their tool stack on Starter Story (email)”
Lifecycle EmailMaker says so · source ↗“Aside from the most commonly used tools like Google Docs, we use Mixpanel for analytics, customer.io for retention, and a few other developer tools like GitHub .”
Lifecycle EmailMaker says so · source ↗“It’s amazing for managing a community, it’s feature-rich, and it’s fun to use! I am also a big fan of customer io , they make our email and people management efforts way easier.”
Lifecycle EmailMaker says so · source ↗“Listed in their tool stack on Starter Story (email)”
Lifecycle EmailMaker says so · source ↗“Listed in their tool stack on Starter Story (email)”
Lifecycle EmailMaker says so · source ↗“It is the CRM that we needed to communicate with our customers. It is a developer first kind of approach where we can setup events and communicate with our customers through various channels.”
Lifecycle EmailMaker says so · source ↗“Great for building a quick event driven system.”
Lifecycle EmailMaker says so · source ↗“Listed in their tool stack on Starter Story (email)”
Lifecycle EmailMaker says so · source ↗“We run our lifecycle emails on Customer.io.”
Lifecycle EmailMaker says so · source ↗“Shoutout to customer.io for helping us outbound to every new paid customer over the past year, so that we could understand the gaps and confusion in our pricing!”
Lifecycle EmailMaker says so · source ↗“We use Customer.io to handle all our behavioral messages. It is reliable, flexible, and fits perfectly with how we track user activity inside ROAARRR.”
Lifecycle EmailMaker says so · source ↗“Powered personalized communication with our users, delivering timely insights and portfolio updates right to their inbox.”
Lifecycle EmailMaker says so · source ↗“We use customer.io to communicate with our customers and love their service!”
Lifecycle EmailMaker says so · source ↗“We use customer.io to communicate with our customers for almost all transactions and campaigns.”
Lifecycle EmailMaker says so · source ↗“Customer.io for automated emails.”
Lifecycle EmailMaker says so · source ↗Open source: a project that declares Customer.io as a dependency in its public code — verifiable, but not necessarily a live product.
What makers say
22 makers on why they use Customer.io, in their own words on Product Hunt.
Customer.io is the customer engagement platform built for lifecycle marketing, with segmentation, behavioral triggers, and multi-channel messaging across email, SMS, push, and in-app all in one place. We chose it because it lets you send based on what customers actually do, not just a schedule, and the IFTTT integration means real-world activity can feed directly into your campaigns.
IFTTTSep 2026 ↗It is the CRM that we needed to communicate with our customers. It is a developer first kind of approach where we can setup events and communicate with our customers through various channels.
Mida.soSep 2026 ↗I am a big fan of customer.io to create marketing automation flows as we are in a high volume business and one-to-one communication isn’t always feasible, yet we do love to be proactive.
It’s amazing for managing a community, it’s feature-rich, and it’s fun to use! I am also a big fan of customer io , they make our email and people management efforts way easier.
CustomerIO - They make building communication and email flows super easy and have given me (as the non-technical cofounder) far more control over our customer comms.
Alternatives to Customer.io
All alternatives by situation →Questions makers ask about Customer.io
Is Customer.io open source or self-hostable?
Not open source, and hosted only.
Can AI coding agents work with Customer.io?
No llms.txt, official MCP server or CLI found yet.
Who uses Customer.io?
47 makers' products we track, each with a source, and 5 open-source projects declare it in their code. source ↗