3si's tech stack
What does 3si use?
3si (3si.fr) uses at least 7 tools we can see from public records, including Brevo for marketing, tarteaucitron for security, Microsoft 365 for email and documents and Google Analytics for analytics. Last checked .
- Industry
- Software
- Size
- 11–50 employees
- Based in
- Guéret, France
- Founded
- 1983
- Company page
- Tools found
- 7
- Categories
- 7
- Layers
- 4 of 5
- Last checked
- Nov 2026
3si's stack, layer by layer
Of 7 tools, 3 came from website code, 3 from DNS verification records and 1 from email records. Each tool links to the other companies we've found using it. The label says what kind of public trace gave it away.
Application
1 tool, what the product is built with
Media & UI
Data & Observability
1 tool, what they measure and store
Analytics
Go-to-market
1 tool, how they find and keep customers
Marketing
Company Ops
4 tools, what the team runs on day to day
Email Delivery
Workspace
Dev Tools
Security & Compliance
Companies like 3si also use
Tools common among companies with a similar stack that we haven't found at 3si.
Companies with a stack like 3si's
Ranked by shared tools, with rare tools counting more.
GéoContactSoftware · 11–50 people5in common
Groupe JvsSoftware · 201–1,000 people2in common
Les Quinconces et L'EspalPerforming Arts · 11–50 people4in common
Educatech ExpoHigher Education · 11–50 people4in common
Health Center One to one MeetingsHealthcare · 11–50 people4in common
Brain Up AssociationHealth, Wellness and Fitness · 11–50 people4in common
Crij OccitanieInformation Services · 11–50 people4in common
Bosphore SenseMarketing and Advertising · 11–50 people2in common
More Software companies
Other Software companies we've checked.
3si tech stack 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 736,680 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 904,091 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 84,580 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 825,765 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.
We read public traces only: DNS and email records, certificate logs, website code and published subprocessor lists. A tool is listed when a direct record backs it up, and dropped when a recheck no longer finds it. Is this your company? See how to opt out.