# What does Circa use?

Circa (circa.co) shows public evidence of 13 tools, according to runsonwhat (last checked 2026-10-20).

- Industry: Marketing
- Size: 11–50 employees
- Based in: Boston, United States
- LinkedIn: https://www.linkedin.com/company/simplecirca

## Edge & Hosting

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

## Application

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [jQuery](https://www.runsonwhat.com/reverse/jquery) | Frontend | Website code |  |
| [Stripe](https://www.runsonwhat.com/reverse/stripe) | Payments & Billing | DNS verification records |  |

## Go-to-market

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Mailchimp](https://www.runsonwhat.com/reverse/mailchimp) | Marketing | Email records |  |
| [Webflow](https://www.runsonwhat.com/reverse/webflow) | Website & CMS | Website code |  |
| [Marketo](https://www.runsonwhat.com/reverse/marketo) | Marketing | Email records |  |
| [Mixmax](https://www.runsonwhat.com/reverse/mixmax) | Sales & CRM | Custom domain |  |

## Company Ops

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Google Workspace](https://www.runsonwhat.com/reverse/google-workspace) | Workspace | Email records |  |
| [reCAPTCHA](https://www.runsonwhat.com/reverse/recaptcha) | Security & Compliance | Website code |  |
| [SendGrid](https://www.runsonwhat.com/reverse/sendgrid) | Email Delivery | Custom domain, Email records |  |
| [Zoom](https://www.runsonwhat.com/reverse/zoom) | Collaboration | DNS verification records |  |
| [Postman](https://www.runsonwhat.com/reverse/postman) | Dev Tools | DNS verification records |  |

## FAQ

### What tools does Circa use?

As of October 2026, runsonwhat has found 13 tools at Circa (circa.co) in public records. Edge & Hosting: Cloudflare. Application: jQuery and Stripe. Go-to-market: Mailchimp, Webflow and Marketo. Company Ops: Google Workspace, reCAPTCHA and SendGrid. Last checked October 20, 2026.

### What sales tools does Circa use?

The sales tools runsonwhat has found at Circa are Mixmax (October 2026); no CRM shows up in Circa's public records. runsonwhat found Mixmax through a subdomain that points at Mixmax. Mixmax is used by 21 companies runsonwhat tracks.

### What email provider does Circa use?

Circa uses Google Workspace for email and office software, according to runsonwhat (October 2026). runsonwhat found Google Workspace through email records that authorize Google Workspace. Google Workspace is used by 402,387 companies runsonwhat tracks.

### What payment provider does Circa use?

Circa uses Stripe for payments and billing, according to runsonwhat (October 2026). runsonwhat found Stripe through a DNS verification record for Stripe. Stripe is used by 28,108 companies runsonwhat tracks.

### What is Circa's website built with?

Circa uses Webflow for its website, according to runsonwhat (October 2026). runsonwhat found Webflow through Webflow code on circa.co. Webflow is used by 34,832 companies runsonwhat tracks.

### What marketing software does Circa use?

Circa uses Mailchimp for marketing, alongside Marketo, according to runsonwhat (October 2026). runsonwhat found Mailchimp through email records that authorize Mailchimp. Mailchimp is used by 114,973 companies runsonwhat tracks.

### Does Circa use jQuery?

Yes. runsonwhat found jQuery at Circa through jQuery code on circa.co. jQuery is a Frontend tool used by 915,214 companies runsonwhat tracks.

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

The companies with the stacks most like Circa's are Routable, Belisari, Yaggo and True, according to runsonwhat (October 2026). Each shares 4 to 8 tools with Circa, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices.

### How does runsonwhat know what Circa uses?

runsonwhat reads public records only. Of the 13 tools at Circa, 5 were found through DNS records, 3 through code on circa.co, 3 through email records and 2 through subdomains that point at the vendor. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and circa.co about monthly.


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Source: runsonwhat, https://www.runsonwhat.com/company/circa.co (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.