runsonwhat

Rectangle's tech stack

What does Rectangle use?

Rectangle (rectanglehq.com) uses at least 16 tools we can see from public records, including Vercel for hosting, Google Workspace for email and documents, Leadinfo for sales and Scalar for customer support. Last checked .

LinkedIn
Company page
Re-check liveVisit rectanglehq.com
Tools found
16
Categories
11
Layers
5 of 5
Last checked
Oct 2026

Rectangle's stack, layer by layer

Each tool links to the other companies we've found using it. The label says what kind of public trace gave it away.

Edge & Hosting

3 tools, where the bytes are served from

Hosting & Cloud

CDN & Edge

Application

1 tool, what the product is built with

Media & UI

Data & Observability

2 tools, what they measure and store

Analytics

Go-to-market

7 tools, how they find and keep customers

Website & CMS

Marketing

Ads & Pixels

Sales & CRM

Support & Docs

Company Ops

3 tools, what the team runs on day to day

Email Delivery

Workspace

Companies like Rectangle also use

Tools common among companies with a similar stack that we haven't found at Rectangle.

Companies with a stack like Rectangle's

Ranked by shared tools, with rare tools counting more.

Rectangle tech stack FAQ

What tools does Rectangle use?

We've found 16 tools at Rectangle (rectanglehq.com). Edge & Hosting: Cloudflare, Vercel and Render. Application: Google Fonts. Data & Observability: Google Tag Manager and PostHog. Go-to-market: LinkedIn Insight Tag, Framer and Leadinfo. Company Ops: Google Workspace, SendGrid and Resend. Last checked October 7, 2026.

What cloud does Rectangle run on?

Rectangle uses Vercel and Render for hosting. We found Vercel through DNS verification records.

What CRM does Rectangle use?

Rectangle uses Leadinfo, lemlist and Warmly for sales and CRM. We found Leadinfo through website code.

What email provider does Rectangle use?

Rectangle uses Google Workspace for email and documents. We found Google Workspace through email records.

What does Rectangle use for customer support?

Rectangle uses Scalar for customer support. We found Scalar through custom domain.

What analytics tools does Rectangle use?

Rectangle uses Google Tag Manager and PostHog for analytics. We found Google Tag Manager through website code.

Does Rectangle use Cloudflare?

Yes. We found Cloudflare at Rectangle through DNS records, email records and website code. Cloudflare is used by 572,047 companies we track.

How does runsonwhat know what Rectangle uses?

We read public traces only: Rectangle's DNS and email records, certificate logs, the code its website loads, and published subprocessor lists. A tool is listed only when a direct record backs it up. DNS is rechecked weekly and the website 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.