# What does CONCAT use?

CONCAT (concat.kr) shows public evidence of 6 tools, according to runsonwhat (last checked 2026-10-31).

- Industry: IT Services
- Size: 11–50 employees
- Based in: South Korea
- Founded: 2018
- LinkedIn: https://www.linkedin.com/company/concat-inc

## Edge & Hosting

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Vercel](https://www.runsonwhat.com/reverse/vercel) | Hosting & Cloud | Custom domain, DNS records, Website code |  |

## Application

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Next.js](https://www.runsonwhat.com/reverse/nextjs) | Frontend | Website code |  |
| [Firebase](https://www.runsonwhat.com/reverse/firebase) | Backend & Database | Custom domain |  |

## Data & Observability

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

## Company Ops

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Google Workspace](https://www.runsonwhat.com/reverse/google-workspace) | Workspace | Email records |  |

## Recent changes at CONCAT

- 2026-10-21: started using [Firebase](https://www.runsonwhat.com/reverse/firebase)

## FAQ

### What tools does CONCAT use?

As of November 2026, runsonwhat has found 6 tools at CONCAT (concat.kr) in public records. Edge & Hosting: Vercel. Application: Next.js and Firebase. Data & Observability: Vercel Analytics. Company Ops: Google Workspace. Last checked October 31, 2026.

### What cloud does CONCAT run on?

CONCAT uses Vercel for hosting and cloud infrastructure, according to runsonwhat (November 2026). runsonwhat found Vercel through a subdomain that points at Vercel and DNS records. Vercel is used by 51,956 companies runsonwhat tracks.

### What email provider does CONCAT use?

CONCAT uses Google Workspace for email and office software, according to runsonwhat (November 2026). runsonwhat found Google Workspace through email records that authorize Google Workspace. Google Workspace is used by 414,683 companies runsonwhat tracks.

### What analytics tools does CONCAT use?

CONCAT uses Vercel Analytics for analytics, according to runsonwhat (November 2026). runsonwhat found Vercel Analytics through Vercel Analytics code on concat.kr. Vercel Analytics is used by 8,213 companies runsonwhat tracks.

### Does CONCAT use Next.js?

Yes. runsonwhat found Next.js at CONCAT through Next.js code on concat.kr. Next.js is a Frontend tool used by 69,436 companies runsonwhat tracks.

### Has CONCAT changed tools recently?

Yes. On runsonwhat's rechecks, CONCAT started using Firebase (latest on October 21, 2026). A change counts only between two checks of concat.kr done the same way.

### How does runsonwhat know what CONCAT uses?

runsonwhat reads public records only. Of the 6 tools at CONCAT, 2 were found through code on concat.kr, 2 through subdomains that point at the vendor, 1 through DNS records and 1 through email records. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and concat.kr about monthly.


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Source: runsonwhat, https://www.runsonwhat.com/company/concat.kr (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.