Technology · Marketing automation
7,146 websites in the live index use Customer.io as of October 2026. Download the full list of Customer.io websites with website, company, country and language.
SourceAs of October 27, 2026, TechLeads detects Customer.io on 7,146 websites: 0.15% of Marketing automation detections, the 52nd most-used of 542 Marketing automation technologies we track.
Sample results for Customer.io. Description is shown under each title.
| Rank | Website | Title · Description | Company | Country | Language |
|---|---|---|---|---|---|
| #2,656 | mxtoolbox.com | MX Lookup Tool - Check your DNS MX Records online - MxToolbox | - | - | - |
| #3,169 | decrypt.co | Decrypt: AI, Bitcoin, Culture, Gaming, and Crypto News - DecryptThe next-generation media outlet navigating the intersection of culture and technology. | Decrypt | US | en-US |
| #4,294 | streamlabs.com | zwansux / Streamlabszwansux's official website powered by Streamlabs | - | - | - |
| #7,818 | hvg.hu | Tech | hvg.huHVG – Hiteles hírek és elemzések gazdaságról, politikáról, kultúráról és életmódról, Magyarország vezető portálján. | HVG | - | - |
| #10,000 | theknot.com | Wedding, Engagement & Relationship Ideas & Articles | The KnotGet details on weddings, relationships & more with the experts at The Knot. From bridal inspo to celebrity wedding news, we write articles you can trust. | theknot.com | - | en |
| #17,545 | webvizio.com | Speed your web project delivery and build a bug-free productWebvizio is a visual bug tracking and website feedback tool designed for web agencies, product managers, QA teams, and developers. | Webvizio | Website Feedback & Bug Tracking Tool | - | en |
| #18,024 | sendoutcards.com | SendOutCardsCapture life | - | - | - |
| #27,622 | mimo.org | Learn to Code in Python, JavaScript, HTML, CSS, & more | MimoLearn to code at your own pace. Start for free with our comprehensive courses in Python, JavaScript, HTML, and CSS, and become a professional developer. | Mimo | - | - |
| #28,155 | clearbit.com | Clearbit has joined HubSpotNow reinvented with Artificial Intelligence—Clearbit is the first HubSpot Native Data Provider. Enrich your records, score, route, and reveal buying intent from your visitors. | - | - | - |
| #29,276 | watsi.org | Watsi | Fund healthcare for people around the worldWatsi is a nonprofit that brings people together through technology to fund life-changing healthcare. | Chase Adam | - | - |
| #29,965 | lingopie.com | Language Learning with TV Shows, Movies and MusicLearn a new language just by watching TV shows with subtitles. Get instant access to hundreds of great foreign TV shows in the language you are learning. | - | - | en |
| #37,307 | cmscritic.com | CMS Critic - The leading news source for CMS, DXP, and beyond | - | - | - |
| #40,875 | tryfi.com | Dog GPS & Health tracking | $19/month | Fi Smart Dog CollarFetch the most advanced GPS, behavior, and activity tracking technology for your pet. | - | - | - |
| #42,009 | egghead.io | Expert led courses for front-end web developers. | egghead.io | - | - | - |
| #43,006 | raceid.com | RaceID | - | - | - |
| #57,952 | ora.pm | Ora: Get more done. With your team.A task manager that works wonders. Chat, plan, and execute with your team. Make every task count. Sign up for Ora for free today! | Ora | - | en |
| #100,000 | albert.io | Grades 5-12 reading, writing, math, science, and test prep | AlbertAlbert offers teachers rigorous, standards-aligned practice content for grades 5-12 in ELA, math, science, social studies, Spanish, AP, ACT/SAT, and state exams. | - | - | en |
| #100,000 | bokadirekt.se | Boka din skönhetsbehandling online | BokadirektYstadbaserad cert.medicinsk massageterapeut & fransstylist med ett brinnande intresse för CrossFit och att rehabilitera & hjälpa människor ur deras smärta. | - | SE | sv-SE |
| #100,000 | kariera.gr | kariera.grkariera.gr search for jobs | - | GR | en |
| #100,000 | brustring-forum.de | VfB Stuttgart-FanforumNeben dem Forum mit VfB-Blog und einem Noten- sowie Aufstellungstool bieten wir ein Tippspiel und ein Ticketforum. | - | - | - |
| #128,825 | bizplanr.ai | Free AI Business Plan Generator: Create Your Plan in MinutesCreate professional business plans effortlessly with BizPlanr's FREE AI-powered business plan generator. Secure funding, Save time, impress investors, and focus on growing your business. | - | - | - |
| #159,024 | huntr.co | Job Application Tracker, AI Resume Builder, Resume Tailor and MoreHuntr helps you organize your job search, create tailored resumes and cover letters in seconds and fill out application forms in one click. | Huntr | - | - |
| #365,248 | scrap.io | Google Maps leads generator | Scrap.ioTransform your Google Maps search into a leads file with Scrap.io. Enjoy a 7-day free trial to explore 4,000+ categories across 195 countries. | Scrap.io | - | - |
| #450,365 | truvera.io | Truvera Workspace | - | - | - |
| #500,000 | annuncianimali.it | AnnunciAnimaliAnnunciAnimali è tra i siti di annunci e informazioni gratuiti per animali domestici più popolari in Italia. Compra, vendi e adotta cuccioli, cani, gattini, gatti nella tua zona. | AnnunciAnimali | IT | it |
Complete Customer.io website dataset in CSV. One-time purchase.
Customer.io dataset · CSV
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The most-used Marketing automation technologies in the TechLeads index, by number of websites. Customer.io accounts for 0.15% of Marketing automation detections (7,146 websites).
| No. | Technology | Websites | Share of Marketing automation | Relative size |
|---|---|---|---|---|
| 01 | MailChimp | 835,867 | 17.9% | |
| 02 | HubSpot | 747,900 | 16.0% | |
| 03 | Klaviyo | 403,088 | 8.6% | |
| 04 | Social Miner | 236,116 | 5.1% | |
| 05 | MailChimp for WordPress | 232,257 | 5.0% | |
| 06 |
TechLeads scans public websites and identifies Customer.io from signals in the page HTML, scripts, cookies, HTTP headers and DNS records. Website counts refresh daily; this page uses data from October 27, 2026. Counts only include websites we have scanned, so they can differ from other providers.
The TechLeads live index currently lists 7,146 websites using Customer.io. Open the sample table on this page or download the lead list.
The chart on this page is monthly HTTP Archive crawl detections for Customer.io, compared with other Marketing Automation technologies. It is not the TechLeads live index.
In the same HTTP Archive category, Customer.io is charted against HubSpot, Klaviyo, Pardot, Salesforce Marketing Cloud Account Engagement, MailChimp for WordPress. Live-index co-occurrence on this page is a separate signal.
Companies and websites using Customer.io in the TechLeads index include mxtoolbox.com, decrypt.co, streamlabs.com, hvg.hu, theknot.com. The full list of 7,146 websites, with company name, country and language, is available as a CSV export.
By number of websites in the TechLeads index, the most-used Marketing automation alternatives to Customer.io are MailChimp (835,867), HubSpot (747,900), Klaviyo (403,088).
| Sendinblue |
|---|
| 193,456 |
| 4.1% |
| 07 | HighLevel | 157,191 | 3.4% |
|---|
| 08 | Yandex Metrika | 151,981 | 3.3% |
|---|
| 09 | ActiveCampaign | 133,896 | 2.9% |
|---|
| 10 | OneSignal | 131,819 | 2.8% |
|---|
TechLeads scans public websites and matches Customer.io by signals in the page HTML, scripts, cookies, HTTP headers and DNS records. Website counts refresh daily.
Yes. A one-time Customer.io dataset is $29 as a CSV. The Growth plan ($79/mo) covers 10 technologies with recurring exports, alerts and API access.
Monthly detections of Customer.io in the HTTP Archive crawl. This is historical crawl coverage, not the TechLeads live website index.
Same HTTP Archive category (Marketing Automation), not the whole web. Toggle competitors on or off.
Optional rank bands from the crawl (top 1k through long tail). Missing months are crawl gaps, not uninstalls.
Email people automatically based on what they do (or don't do) in your app.
Our comprehensive database contains 7,146 websites using Customer.io, making it the most complete Customer.io sites list available. This Customer.io customer websites directory helps businesses detect websites using Customer.io and identify potential leads.
Our Customer.io technology detection system scans millions of websites to identify those powered by Customer.io. This list of sites with Customer.io includes detailed information such as company names, contact details, social media profiles, and website rankings. Whether you're looking for top websites with Customer.io or exploring Customer.io adoption trends, our database provides comprehensive insights.
Each entry in our Customer.io sites list includes valuable data points: domain name, global ranking, company information, contact details, social media links. This makes it easy to detect websites using Customer.io and reach out to potential customers or partners.
Get instant access to the full list of sites with Customer.io in CSV format. Our dataset includes all 7,146 Customer.io customer websites with complete contact information, perfect for lead generation, market research, and competitive analysis. The data is regularly updated to ensure accuracy and includes the latest Customer.io powered websites.
