# What does 3si use?

3si (3si.fr) shows public evidence of 7 tools, according to runsonwhat (last checked 2026-11-06).

- Industry: Software
- Size: 11–50 employees
- Based in: Guéret, France
- Founded: 1983
- LinkedIn: https://www.linkedin.com/company/3si-software

## Application

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Google Fonts](https://www.runsonwhat.com/reverse/google-fonts) | Media & UI | 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 |
|---|---|---|---|
| [Brevo](https://www.runsonwhat.com/reverse/brevo) | Marketing | DNS verification records |  |

## Company Ops

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Microsoft 365](https://www.runsonwhat.com/reverse/microsoft-365) | Workspace | DNS verification records, Email records |  |
| [SendGrid](https://www.runsonwhat.com/reverse/sendgrid) | Email Delivery | Email records |  |
| [Atlassian](https://www.runsonwhat.com/reverse/atlassian) | Dev Tools | DNS verification records |  |
| [tarteaucitron](https://www.runsonwhat.com/reverse/tarteaucitron) | Security & Compliance | Website code |  |

## FAQ

### What tools does 3si use?

As of November 2026, runsonwhat has found 7 tools at 3si (3si.fr) in public records. Application: Google Fonts. Data & Observability: Google Analytics. Go-to-market: Brevo. Company Ops: Microsoft 365, SendGrid and Atlassian. Last checked November 6, 2026.

### What email provider does 3si use?

3si uses Microsoft 365 for email and office software, according to runsonwhat (November 2026). runsonwhat found Microsoft 365 through a DNS verification record for Microsoft 365 and email records. Microsoft 365 is used by 736,688 companies runsonwhat tracks.

### What analytics tools does 3si use?

3si uses Google Analytics for analytics, according to runsonwhat (November 2026). runsonwhat found Google Analytics through Google Analytics code on 3si.fr. Google Analytics is used by 904,092 companies runsonwhat tracks.

### What marketing software does 3si use?

3si uses Brevo for marketing, according to runsonwhat (November 2026). runsonwhat found Brevo through a DNS verification record for Brevo. Brevo is used by 84,581 companies runsonwhat tracks.

### Does 3si use Google Fonts?

Yes. runsonwhat found Google Fonts at 3si through Google Fonts code on 3si.fr. Google Fonts is a Media & UI tool used by 825,768 companies runsonwhat tracks.

### Which companies have a tech stack similar to 3si's?

The companies with the stacks most like 3si's are GéoContact, Groupe Jvs, Les Quinconces et L'Espal and Educatech Expo, according to runsonwhat (November 2026). Each shares 2 to 5 tools with 3si, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices.

### How does runsonwhat know what 3si uses?

runsonwhat reads public records only. Of the 7 tools at 3si, 3 were found through code on 3si.fr, 3 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 3si.fr about monthly.


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Source: runsonwhat, https://www.runsonwhat.com/company/3si.fr (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.