Sites like Customer

01 · Entity

About Customer

Customer customer.io

Customer.io: Customer Engagement Platform For Better Outcomes

Customer.io is a customer engagement platform for creating personalized journeys and better business outcomes across email, push, SMS, and in-app messaging.

Top 10K · #2,083 English 19 technologies Crawled Nov 6, 2026

Visit Customer

Summary by Claude

Customer.io is software for sending automated, data-driven messages to customers across email, push notifications, SMS and in-app channels, with segmentation, journey building, analytics and an AI agent for building automations.

Who it’s for

Marketing and product teams at digital businesses

Business model

Subscriptions

• marketing automation software
• email marketing automation
• push notifications
• SMS messaging
• in-app messaging
• customer journey builder
• audience segmentation
• customer data integrations
• campaign analytics

02 · Embedding space

Competitor map

Each alternative by how close its vector is to Customer’s (x) and how much traffic it gets, how much of the stack it shares, or where it sits in the embedding space itself (y). Lines split each axis at the median. Hover for the numbers, click to jump to it in the list.

1. 01
   CM.com cm.com Top 1K English

   One platform for every customer interaction | CM.com

   Behind every customer moment is a conversation that just works. CM.com connects messaging, marketing, service and payments on one shared context.

   • DocuSign
   • Google Search Console
   • Google Tag Manager
   • Microsoft 365
   • Apple Business
   • Atlassian

   0 say CM.com is a good alternative to Customer 0 say CM.com isn’t a real alternative to Customer

   Comment
   Very close cos 0.913
2. 02
   Klaviyo klaviyo.com Top 1K German

   Klaviyo: KI-gestütztes E-Mail-Marketing und SMS | B2C CRM

   Klaviyo vereint KI-gestütztes E-Mail-Marketing und SMS, um Wachstum, Kundenbindung und messbare Ergebnisse zu erzielen. Erstelle personalisierte Omnichannel-Erlebnisse für WhatsApp, E-Commerce und mehr mit K:AI-Agents.

   • DocuSign
   • Google Search Console
   • Google Tag Manager
   • Google Workspace
   • HubSpot
   • Microsoft 365

   0 say Klaviyo is a good alternative to Customer 0 say Klaviyo isn’t a real alternative to Customer

   Comment
   Very close cos 0.910
3. 03
   Brevo brevo.com Top 10K English

   Brevo: Email & SMS Marketing, CRM & Automation Platform

   Brevo is the most intuitive all-in-one customer engagement platform: email and SMS marketing, automation, CRM, live chat, and transactional email. Try it free.

   • Google Search Console
   • Google Workspace
   • Microsoft 365
   • Miro
   • Next.js
   • Notion

   0 say Brevo is a good alternative to Customer 0 say Brevo isn’t a real alternative to Customer

   Comment
   Very close cos 0.911
4. 04
   Pushwoosh pushwoosh.com Top 10K English

   Customer engagement platform: push, email, in-app | Pushwoosh

   All-in-one customer engagement platform: omnichannel messaging, actionable CDP, advanced segmentation & automation. Turn customer data into high-converting campaigns.

   • Amazon SES
   • Google Search Console
   • Google Tag Manager
   • Google Workspace
   • HubSpot
   • Zendesk

   0 say Pushwoosh is a good alternative to Customer 0 say Pushwoosh isn’t a real alternative to Customer

   Comment
   Very close cos 0.908
5. 05
   Braze braze.com Top 1K English

   Braze Customer Engagement Platform

   Power customer-centric interactions between consumers and brands in real-time.

   • Amazon SES
   • DocuSign
   • Google Search Console
   • Google Tag Manager
   • Google Workspace
   • Microsoft 365

   0 say Braze is a good alternative to Customer 0 say Braze isn’t a real alternative to Customer

   Comment
   Very close cos 0.908
6. 06
   Insider One useinsider.com Top 10K English

   Insider One | #1 Platform for AI-Powered Customer Engagement

   Insider One is the #1 Customer Engagement AI Platform for marketing teams. Unify CDP, personalization & journey orchestration to engage customers everywhere.

   • Google Search Console
   • Google Tag Manager
   • Google Workspace
   • HubSpot
   • Zendesk
   • Apple Business

   0 say Insider One is a good alternative to Customer 0 say Insider One isn’t a real alternative to Customer

   Comment
   Very close cos 0.906
7. 07
   MoEngage moengage.com Top 10K English

   MoEngage - Agentic Customer Engagement Platform

   Execute your cross channel marketing strategy with MoEngage’s insights-led customer engagement platform. Leverage the power of personalization with MoEngage.

   • Google Search Console
   • Google Workspace
   • HubSpot
   • Mailchimp
   • Microsoft 365
   • Notion

   0 say MoEngage is a good alternative to Customer 0 say MoEngage isn’t a real alternative to Customer

   Comment
   Very close cos 0.907
8. 08
   Airship urbanairship.com Top 10K English

   Customer Experience Platform | Airship

   Airship is the only mobile-first customer experience platform that delivers measurable results through AI-powered, unified cross-channel experiences.

   • DocuSign
   • Google Search Console
   • Google Tag Manager
   • Google Workspace
   • Microsoft 365
   • OpenAI

   0 say Airship is a good alternative to Customer 0 say Airship isn’t a real alternative to Customer

   Comment
   Very close cos 0.899
9. 09
   Zendesk zendesk.com Top 1K German

   KI-gestützte Serviceplattform | Zendesk

   Mehr als Ticketvermeidung: KI-Agenten lösen Anfragen durchgängig. Verbessern Sie Servicequalität, Geschwindigkeit und Skalierung. Jetzt kostenlos testen.

   • DocuSign
   • Google Search Console
   • Google Tag Manager
   • Google Workspace
   • HubSpot
   • Microsoft 365

   0 say Zendesk is a good alternative to Customer 0 say Zendesk isn’t a real alternative to Customer

   Comment
   Very close cos 0.902
10. 10
    Twilio twilio.com Top 10K English

    Conversational AI and APIs for SMS, Email, Voice | Twilio

    Build amazing customer experiences on the Twilio platform with APIs for SMS, RCS, voice, and email, plus conversational AI for smarter engagement, and identity verification for trust.

    • DocuSign
    • Google Search Console
    • Google Tag Manager
    • Google Workspace
    • Meta Business Suite
    • Microsoft 365

    0 say Twilio is a good alternative to Customer 0 say Twilio isn’t a real alternative to Customer

    Comment
    Very close cos 0.900
11. 11
    WebEngage webengage.com Top 10K English

    WebEngage | Customer Data and Agentic Marketing Platform

    Unify customer data and run AI-powered, personalized journeys across channels with WebEngage’s customer data platform and marketing automation suite.

    • Amazon SES
    • Google Search Console
    • Google Tag Manager
    • Google Workspace
    • Mailchimp
    • Amazon Route 53

    0 say WebEngage is a good alternative to Customer 0 say WebEngage isn’t a real alternative to Customer

    Comment
    Very close cos 0.900
12. 12
    iterable.com Top 10K English

    AI Customer Engagement Platform for Real-Time, Personalized Experiences

    Iterable is an AI customer engagement platform built for how customers behave today, helping brands respond in real time with unified data and optimization.

    • Amazon SES
    • DocuSign
    • Google Search Console
    • Google Tag Manager
    • Google Workspace
    • Miro

    0 say iterable.com is a good alternative to Customer 0 say iterable.com isn’t a real alternative to Customer

    Comment
    Very close cos 0.895
13. 13
    Semrush semrush.com Top 10K English

    Semrush: Your Unfair Advantage for Growing Brand Visibility

    Semrush is the leading platform to grow and measure brand visibility across AI search, SEO, PPC, social, and more.

    • Amazon SES
    • Google Search Console
    • Google Workspace
    • HubSpot
    • Meta Business Suite
    • Microsoft 365

    0 say Semrush is a good alternative to Customer 0 say Semrush isn’t a real alternative to Customer

    Comment
    Very close cos 0.898
14. 14
    Salesforce salesforce.com Top 1K German

    Salesforce: Das führende CRM mit KI | Salesforce DE

    Salesforce ist das führende CRM mit KI. Es hilft Unternehmen, sich auf völlig neue Weise mit Kund:innen zu vernetzen, indem es die Daten, Apps und Agents zusammenbringt, die das Unternehmen am Laufen halten.

    • Google Search Console
    • Google Workspace
    • HubSpot
    • Notion
    • Akamai
    • Akamai Bot Manager

    0 say Salesforce is a good alternative to Customer 0 say Salesforce isn’t a real alternative to Customer

    Comment
    Very close cos 0.897
15. 15
    Sendbird sendbird.com Top 10K English

    The AI customer experience platform for enterprise | Sendbird

    Engage your customers and improve customer loyalty with an AI customer experience platform trusted by enterprises worldwide.

    • Amazon SES
    • DocuSign
    • Google Search Console
    • Google Tag Manager
    • Google Workspace
    • HubSpot

    0 say Sendbird is a good alternative to Customer 0 say Sendbird isn’t a real alternative to Customer

    Comment
    Very close cos 0.895
16. 16
    Marketo marketo.com Top 10K

    software company providing market automation software

    • Google Search Console
    • Meta Business Suite
    • Microsoft 365
    • Marketo
    • Salesforce
    • SendGrid

    0 say Marketo is a good alternative to Customer 0 say Marketo isn’t a real alternative to Customer

    Comment
    Close cos 0.893
17. 17
    OneSignal onesignal.com Top 10K English

    Customer Engagement Platform for Email, Push… - OneSignal

    The world's leader for mobile push notifications, web push, SMS, email and in-app messaging. Trusted by 2 million+ businesses to send 12 billion+ messages per…

    • Google Search Console
    • Google Tag Manager
    • Google Workspace
    • Miro
    • Bootstrap
    • cdnjs

    0 say OneSignal is a good alternative to Customer 0 say OneSignal isn’t a real alternative to Customer

    Comment
    Close cos 0.892
18. 18
    SaleSmartly salesmartly.com Top 10K English

    AI-Powered Omnichannel Customer Engagement Platform | SaleSmartly

    Trusted by 300,000+ businesses. Unify WhatsApp, Telegram, Facebook, Instagram & more in a shared inbox with AI agents, CRM & automation to capture, convert & retain customers.

    • Google Search Console
    • Next.js
    • React
    • Amazon Route 53
    • Amazon CloudFront
    • nginx

    0 say SaleSmartly is a good alternative to Customer 0 say SaleSmartly isn’t a real alternative to Customer

    Comment
    Close cos 0.893
19. 19
    Copy.ai copy.ai English

    Future proof your business with GTM AI

    Introducing the first-ever GTM AI platform. Automate hundreds of tedious, repetitive tasks and empower your team to scale success like never before.

    • Google Search Console
    • Google Tag Manager
    • Google Workspace
    • HubSpot
    • Meta Business Suite
    • Cloudflare

    0 say Copy.ai is a good alternative to Customer 0 say Copy.ai isn’t a real alternative to Customer

    Comment
    Close cos 0.891
20. 20
    SurveyMonkey surveymonkey.com Top 1K English

    SurveyMonkey: The World’s Most Popular Survey Platform

    Easily create surveys and forms with AI and templates for employee and customer feedback, market research, event registrations and more. Get started free.

    • DocuSign
    • Google Search Console
    • Meta Business Suite
    • Microsoft 365
    • Miro
    • Next.js

    0 say SurveyMonkey is a good alternative to Customer 0 say SurveyMonkey isn’t a real alternative to Customer

    Comment
    Close cos 0.893

Ranked by score: the cosine similarity of each site’s vector to customer.io’s, less a small penalty for generic sites that are close to everything. Highlighted technologies are ones Customer uses too. Votes and comments come from visitors and don’t change the ranking.

04 · Fingerprints

Technology

What Customer is built with, and what its closest competitors use, from its homepage’s code and its DNS records.