# What does Erin use?

Erin (erinapp.com) shows public evidence of 18 tools, according to runsonwhat (last checked 2026-11-06).

- Industry: Human Resources
- Size: 11–50 employees
- Based in: Pittsburgh, United States
- Founded: 2018
- LinkedIn: https://www.linkedin.com/company/erinapp

## Edge & Hosting

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Cloudflare](https://www.runsonwhat.com/reverse/cloudflare) | CDN & Edge | DNS records, Email records, Website code |  |
| [Netlify](https://www.runsonwhat.com/reverse/netlify) | Hosting & Cloud | Custom domain |  |

## Application

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Tailwind CSS](https://www.runsonwhat.com/reverse/tailwind) | Frontend | Website code |  |

## Data & Observability

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Google Analytics](https://www.runsonwhat.com/reverse/ga) | Analytics | Website code |  |

## Go-to-market

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [HubSpot](https://www.runsonwhat.com/reverse/hubspot) | Sales & CRM | Custom domain, Email records, Website code |  |
| [HubSpot CMS](https://www.runsonwhat.com/reverse/hubspot-cms) | Website & CMS | Custom domain |  |
| [Warmly](https://www.runsonwhat.com/reverse/warmly) | Sales & CRM | Website code |  |

## 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 |  |
| [SendGrid](https://www.runsonwhat.com/reverse/sendgrid) | Email Delivery | Email records |  |
| [Let's Encrypt](https://www.runsonwhat.com/reverse/letsencrypt) | Security & Compliance | DNS records |  |
| [Sectigo](https://www.runsonwhat.com/reverse/sectigo) | Security & Compliance | DNS records |  |
| [DigiCert](https://www.runsonwhat.com/reverse/digicert) | Security & Compliance | DNS records |  |
| [Google Trust Services](https://www.runsonwhat.com/reverse/google-trust) | Security & Compliance | DNS records |  |
| [Zoom](https://www.runsonwhat.com/reverse/zoom) | Collaboration | DNS verification records |  |
| [Greenhouse](https://www.runsonwhat.com/reverse/greenhouse) | People & HR | Email records |  |

## FAQ

### What tools does Erin use?

As of November 2026, runsonwhat has found 18 tools at Erin (erinapp.com) in public records. Edge & Hosting: Cloudflare and Netlify. Application: Tailwind CSS. Data & Observability: Google Analytics. Go-to-market: HubSpot, HubSpot CMS and Warmly. Company Ops: Microsoft 365, Google Workspace and SendGrid. Last checked November 6, 2026.

### What cloud does Erin run on?

Erin uses Netlify for hosting and cloud infrastructure, according to runsonwhat (November 2026). runsonwhat found Netlify through a subdomain that points at Netlify. Netlify is used by 12,331 companies runsonwhat tracks.

### What CRM does Erin use?

Erin uses HubSpot for its CRM, alongside Warmly, according to runsonwhat (November 2026). runsonwhat found HubSpot through a subdomain that points at HubSpot and email records. HubSpot is used by 97,438 companies runsonwhat tracks.

### What email provider does Erin use?

Erin 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 731,958 companies runsonwhat tracks.

### What analytics tools does Erin use?

Erin uses Google Analytics for analytics, according to runsonwhat (November 2026). runsonwhat found Google Analytics through Google Analytics code on erinapp.com. Google Analytics is used by 903,832 companies runsonwhat tracks.

### What is Erin's website built with?

Erin uses HubSpot CMS for its website, according to runsonwhat (November 2026). runsonwhat found HubSpot CMS through a subdomain that points at HubSpot CMS. HubSpot CMS is used by 34,420 companies runsonwhat tracks.

### Does Erin use Cloudflare?

Yes. runsonwhat found Cloudflare at Erin through DNS records that point at Cloudflare and email records. Cloudflare is a CDN & Edge tool used by 732,099 companies runsonwhat tracks.

### Which companies have a tech stack similar to Erin's?

The companies with the stacks most like Erin's are Subskribe, Datch, FlowFuse and Symend, according to runsonwhat (November 2026). Each shares 5 to 11 tools with Erin, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices.

### How does runsonwhat know what Erin uses?

runsonwhat reads public records only. Of the 18 tools at Erin, 8 were found through DNS records, 3 through code on erinapp.com, 3 through email records, 3 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 erinapp.com about monthly.


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Source: runsonwhat, https://www.runsonwhat.com/company/erinapp.com (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.