runsonwhat

OpenTools's tech stack

What does OpenTools use?

OpenTools (opentools.com) uses at least 15 tools we can see from public records, including Vercel for hosting, Google Workspace for email and documents, Calendly for sales and Discord for customer support. Last checked .

“The API for LLM tool use”

Industry
Engineering, Product and Design
Size
1–10 employees
Based in
San Francisco, United States
Re-check liveVisit opentools.com
Tools found
15
Categories
11
Layers
5 of 5
Last checked
Oct 2026

OpenTools'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

2 tools, where the bytes are served from

Hosting & Cloud

CDN & Edge

Application

5 tools, what the product is built with

Frontend

Auth & Identity

Media & UI

Data & Observability

4 tools, what they measure and store

Monitoring

Analytics

Go-to-market

3 tools, how they find and keep customers

Marketing

Sales & CRM

Support & Docs

Company Ops

1 tool, what the team runs on day to day

Workspace

Companies like OpenTools also use

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

Companies with a stack like OpenTools's

Ranked by shared tools, with rare tools counting more.

More Engineering, Product and Design companies

Other Engineering, Product and Design companies we've checked.

OpenTools tech stack FAQ

What tools does OpenTools use?

As of October 2026, runsonwhat has found 15 tools at OpenTools (opentools.com) in public records. Edge & Hosting: Cloudflare and Vercel. Application: Google Fonts, React and Tailwind CSS. Data & Observability: Sentry, web-vitals and PostHog. Go-to-market: Calendly and Discord. Company Ops: Google Workspace. Last checked October 9, 2026.

What cloud does OpenTools run on?

OpenTools uses Vercel for hosting and cloud infrastructure, according to runsonwhat (October 2026). runsonwhat found Vercel through a DNS verification record for Vercel and DNS records. Vercel is used by 45,315 companies runsonwhat tracks.

What sales tools does OpenTools use?

The sales tools runsonwhat has found at OpenTools are Calendly (October 2026); no CRM shows up in OpenTools' public records. runsonwhat found Calendly through Calendly code on opentools.com. Calendly is used by 21,915 companies runsonwhat tracks.

What email provider does OpenTools use?

OpenTools uses Google Workspace for email and office software, according to runsonwhat (October 2026). runsonwhat found Google Workspace through email records that authorize Google Workspace and code on opentools.com. Google Workspace is used by 392,654 companies runsonwhat tracks.

What does OpenTools use for customer support?

OpenTools uses Discord for customer support and documentation, according to runsonwhat (October 2026). runsonwhat found Discord through Discord code on opentools.com. Discord is used by 3,460 companies runsonwhat tracks.

What analytics tools does OpenTools use?

OpenTools uses PostHog for analytics, according to runsonwhat (October 2026). runsonwhat found PostHog through PostHog code on opentools.com. PostHog is used by 8,828 companies runsonwhat tracks.

Does OpenTools use Google Fonts?

Yes. runsonwhat found Google Fonts at OpenTools through Google Fonts code on opentools.com. Google Fonts is a Media & UI tool used by 748,994 companies runsonwhat tracks.

Which companies have a tech stack similar to OpenTools's?

The companies with the stacks most like OpenTools' are Interfere, ReJot, DrDroid and atopile, according to runsonwhat (October 2026). Each shares 5 to 8 tools with OpenTools, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices.

How does runsonwhat know what OpenTools uses?

runsonwhat reads public records only. Of the 15 tools at OpenTools, 9 were found through code on opentools.com, 3 through DNS records, 2 through subdomains that point at the vendor and 1 through email records. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and opentools.com 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.