# What does Customer.io use?

Customer.io (customer.io) shows public evidence of 61 tools, according to runsonwhat (last checked 2026-11-09).

- Based in: Beaverton, United States
- Founded: 2012
- LinkedIn: https://www.linkedin.com/company/customer-io

## Edge & Hosting

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Cloudflare](https://www.runsonwhat.com/reverse/cloudflare) | CDN & Edge | Website code |  |
| [Amazon Web Services](https://www.runsonwhat.com/reverse/aws) | Hosting & Cloud | Website code |  |
| [Amazon Route 53](https://www.runsonwhat.com/reverse/route53) | DNS | DNS records |  |
| [Amazon CloudFront](https://www.runsonwhat.com/reverse/cloudfront) | CDN & Edge | Custom domain | 2023-03 |
| [Vercel](https://www.runsonwhat.com/reverse/vercel) | Hosting & Cloud | Custom domain, DNS records, DNS verification records, Website code | 2024-09 |
| [Netlify](https://www.runsonwhat.com/reverse/netlify) | Hosting & Cloud | Custom domain | 2019-02 |

## Application

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [React](https://www.runsonwhat.com/reverse/react) | Frontend | Website code |  |
| [Tailwind CSS](https://www.runsonwhat.com/reverse/tailwind) | Frontend | Website code |  |
| [Anthropic](https://www.runsonwhat.com/reverse/anthropic) | AI | DNS verification records |  |
| [Next.js](https://www.runsonwhat.com/reverse/nextjs) | Frontend | Website code |  |
| [OpenAI](https://www.runsonwhat.com/reverse/openai) | AI | DNS verification records |  |
| [Lottie](https://www.runsonwhat.com/reverse/lottie) | Media & UI | Website code |  |
| [Rive](https://www.runsonwhat.com/reverse/rive) | Media & UI | Website code |  |
| [Sinch](https://www.runsonwhat.com/reverse/sinch) | Backend & Database | DNS verification records |  |

## Data & Observability

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Google Analytics](https://www.runsonwhat.com/reverse/ga) | Analytics | Website code |  |
| [Google Tag Manager](https://www.runsonwhat.com/reverse/gtm) | Analytics | Website code |  |
| [Microsoft Clarity](https://www.runsonwhat.com/reverse/clarity) | Analytics | Website code |  |
| [Sentry](https://www.runsonwhat.com/reverse/sentry) | Monitoring | Website code |  |
| [Vercel Analytics](https://www.runsonwhat.com/reverse/vercel-analytics) | Analytics | Website code |  |
| [Mixpanel](https://www.runsonwhat.com/reverse/mixpanel) | Analytics | DNS verification records, Website code |  |

## Go-to-market

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Google Ads](https://www.runsonwhat.com/reverse/google-ads) | Ads & Pixels | Website code |  |
| [Meta Pixel](https://www.runsonwhat.com/reverse/meta-pixel) | Ads & Pixels | DNS verification records, Website code |  |
| [LinkedIn Insight Tag](https://www.runsonwhat.com/reverse/linkedin-insight) | Ads & Pixels | Website code |  |
| [Microsoft Ads](https://www.runsonwhat.com/reverse/bing-ads) | Ads & Pixels | Website code |  |
| [Mailchimp](https://www.runsonwhat.com/reverse/mailchimp) | Marketing | Email records |  |
| [HubSpot](https://www.runsonwhat.com/reverse/hubspot) | Sales & CRM | Website code |  |
| [Shopify](https://www.runsonwhat.com/reverse/shopify) | Website & CMS | DNS records |  |
| [Zendesk](https://www.runsonwhat.com/reverse/zendesk) | Support & Docs | Email records, Website code |  |
| [Salesforce](https://www.runsonwhat.com/reverse/salesforce) | Sales & CRM | Email records |  |
| [ZoomInfo](https://www.runsonwhat.com/reverse/zoominfo) | Sales & CRM | Website code |  |
| [Reddit Ads](https://www.runsonwhat.com/reverse/reddit-ads) | Ads & Pixels | Website code |  |
| [LiveChat](https://www.runsonwhat.com/reverse/livechat) | Support & Docs | Website code |  |
| [Framer](https://www.runsonwhat.com/reverse/framer) | Website & CMS | Custom domain | 2021 |
| [Sanity](https://www.runsonwhat.com/reverse/sanity) | Website & CMS | Website code |  |
| [G2](https://www.runsonwhat.com/reverse/g2) | Marketing | Website code |  |
| [Help Scout](https://www.runsonwhat.com/reverse/helpscout) | Support & Docs | Email records |  |
| [PartnerStack](https://www.runsonwhat.com/reverse/partnerstack) | Marketing | Custom domain | 2025-02 |
| [RevenueHero](https://www.runsonwhat.com/reverse/revenuehero) | Sales & CRM | Email records |  |

## Company Ops

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Microsoft 365](https://www.runsonwhat.com/reverse/microsoft-365) | Workspace | DNS verification records |  |
| [Google Workspace](https://www.runsonwhat.com/reverse/google-workspace) | Workspace | Email records, Website code |  |
| [Cookiebot](https://www.runsonwhat.com/reverse/cookiebot) | Security & Compliance | Website code |  |
| [Amazon SES](https://www.runsonwhat.com/reverse/ses) | Email Delivery | Email records, Website code |  |
| [Mailchimp Transactional](https://www.runsonwhat.com/reverse/mandrill) | Email Delivery | Email records |  |
| [Mailgun](https://www.runsonwhat.com/reverse/mailgun) | Email Delivery | Custom domain |  |
| [DocuSign](https://www.runsonwhat.com/reverse/docusign) | Finance & Legal | DNS verification records, Website code |  |
| [Miro](https://www.runsonwhat.com/reverse/miro) | Collaboration | DNS verification records |  |
| [Slack](https://www.runsonwhat.com/reverse/slack) | Collaboration | DNS verification records |  |
| [Have I Been Pwned](https://www.runsonwhat.com/reverse/hibp) | Security & Compliance | DNS verification records |  |
| [1Password](https://www.runsonwhat.com/reverse/1password) | Security & Compliance | DNS verification records |  |
| [Cursor](https://www.runsonwhat.com/reverse/cursor) | Dev Tools | DNS verification records |  |
| [Notion](https://www.runsonwhat.com/reverse/notion) | Collaboration | DNS verification records |  |
| [Airtable](https://www.runsonwhat.com/reverse/airtable) | Collaboration | DNS verification records |  |
| [DMARC Digests](https://www.runsonwhat.com/reverse/dmarcdigests) | Security & Compliance | Email records |  |
| [HubSpot App Developer](https://www.runsonwhat.com/reverse/hubspot-developer) | Dev Tools | DNS verification records |  |
| [Zapier](https://www.runsonwhat.com/reverse/zapier) | Dev Tools | DNS verification records |  |
| [JetBrains](https://www.runsonwhat.com/reverse/jetbrains) | Dev Tools | DNS verification records |  |
| [Loom](https://www.runsonwhat.com/reverse/loom) | Collaboration | DNS verification records, Website code |  |
| [Linear](https://www.runsonwhat.com/reverse/linear) | Dev Tools | DNS verification records |  |
| [Maven Central](https://www.runsonwhat.com/reverse/maven-central) | Dev Tools | DNS verification records |  |

## Recent changes at Customer.io

- 2026-10-09: started using [RevenueHero](https://www.runsonwhat.com/reverse/revenuehero)

## FAQ

### What tools does Customer.io use?

As of November 2026, runsonwhat has found 61 tools at Customer.io (customer.io) in public records. Edge & Hosting: Cloudflare, Amazon Web Services and Amazon Route 53. Application: React, Tailwind CSS and Anthropic. Data & Observability: Google Analytics, Google Tag Manager and Microsoft Clarity. Go-to-market: Google Ads, Meta Pixel and LinkedIn Insight Tag. Company Ops: Microsoft 365, Google Workspace and Cookiebot. Last checked November 9, 2026.

### What cloud does Customer.io run on?

Customer.io uses Amazon Web Services for hosting and cloud infrastructure, alongside Vercel and Netlify, according to runsonwhat (November 2026). runsonwhat found Amazon Web Services through Amazon Web Services code on customer.io. Amazon Web Services is used by 147,664 companies runsonwhat tracks.

### What CRM does Customer.io use?

Customer.io uses HubSpot for its CRM, alongside Salesforce, ZoomInfo and RevenueHero, according to runsonwhat (November 2026). runsonwhat found HubSpot through HubSpot code on customer.io. HubSpot is used by 98,094 companies runsonwhat tracks.

### What email provider does Customer.io use?

Customer.io uses Microsoft 365 for email and office software, alongside Google Workspace, according to runsonwhat (November 2026). runsonwhat found Microsoft 365 through a DNS verification record for Microsoft 365. Microsoft 365 is used by 737,877 companies runsonwhat tracks.

### What does Customer.io use for customer support?

Customer.io uses Zendesk for customer support and documentation, alongside LiveChat and Help Scout, according to runsonwhat (November 2026). runsonwhat found Zendesk through email records that authorize Zendesk and code on customer.io. Zendesk is used by 43,843 companies runsonwhat tracks.

### What analytics tools does Customer.io use?

Customer.io uses Google Analytics for analytics, alongside Google Tag Manager, Microsoft Clarity and Vercel Analytics, according to runsonwhat (November 2026). runsonwhat found Google Analytics through Google Analytics code on customer.io. Google Analytics is used by 904,335 companies runsonwhat tracks.

### How long has Customer.io used Netlify?

Customer.io has used Netlify since at least February 2019, going by the first public certificate of the customer.io subdomain that points at Netlify. Other long-running tools at Customer.io include Framer (since 2021), Amazon CloudFront (since March 2023) and Vercel (since September 2024).

### Does Customer.io use Cloudflare?

Yes. runsonwhat found Cloudflare at Customer.io through Cloudflare code on customer.io. Cloudflare is a CDN & Edge tool used by 736,485 companies runsonwhat tracks.

### Does Customer.io use AI tools?

Yes. runsonwhat has found Anthropic and OpenAI at Customer.io; Anthropic, for example, through a DNS verification record for Anthropic. AI services called only from servers leave no public trace, so Customer.io may use more AI tools than these.

### Has Customer.io changed tools recently?

Yes. On runsonwhat's rechecks, Customer.io started using RevenueHero (latest on October 9, 2026). A change counts only between two checks of customer.io done the same way.

### Which companies have a tech stack similar to Customer.io's?

The companies with the stacks most like Customer.io's are Phyllo, Time Doctor, Employment Hero (CA) and Employment Hero, according to runsonwhat (November 2026). Each shares 17 to 32 tools with Customer.io, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices.

### How does runsonwhat know what Customer.io uses?

runsonwhat reads public records only. Of the 61 tools at Customer.io, 23 were found through DNS records, 22 through code on customer.io, 9 through email records, 6 through subdomains that point at the vendor and 1 through website configuration files. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and customer.io about monthly.


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Source: runsonwhat, https://www.runsonwhat.com/company/customer.io (updated November 2026). Counts are companies with direct public evidence of the tool (DNS records, certificates, website code, a real-browser crawl, subprocessor lists), so they are lower bounds. Methodology: https://www.runsonwhat.com/methodology.