# What does OpenTools use?

OpenTools (opentools.com) shows public evidence of 15 tools, according to runsonwhat (last checked 2026-10-09).

- Industry: Engineering, Product and Design
- Size: 1–10 employees
- Based in: San Francisco, United States

## Edge & Hosting

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

## Application

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Google Fonts](https://www.runsonwhat.com/reverse/google-fonts) | Media & UI | Website code |  |
| [React](https://www.runsonwhat.com/reverse/react) | Frontend | Website code |  |
| [Tailwind CSS](https://www.runsonwhat.com/reverse/tailwind) | Frontend | Website code |  |
| [Next.js](https://www.runsonwhat.com/reverse/nextjs) | Frontend | Website code |  |
| [Clerk](https://www.runsonwhat.com/reverse/clerk) | Auth & Identity | Custom domain, Website code |  |

## Data & Observability

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Sentry](https://www.runsonwhat.com/reverse/sentry) | Monitoring | Website code |  |
| [web-vitals](https://www.runsonwhat.com/reverse/web-vitals) | Monitoring | Website code |  |
| [PostHog](https://www.runsonwhat.com/reverse/posthog) | Analytics | Website code |  |
| [Atlassian Statuspage](https://www.runsonwhat.com/reverse/statuspage) | Monitoring | Custom domain |  |

## Go-to-market

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Calendly](https://www.runsonwhat.com/reverse/calendly) | Sales & CRM | Website code |  |
| [Discord](https://www.runsonwhat.com/reverse/discord) | Support & Docs | Website code |  |

## Company Ops

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

## 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 46,562 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 24,576 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 397,578 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 4,771 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 9,403 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 791,171 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.


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Source: runsonwhat, https://www.runsonwhat.com/company/opentools.com (updated October 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.