# Anthony Casalena (slim)

> Anthony Casalena is founder of Squarespace. Acuity Scheduling API on Anchor Terminal, with grades, an about and public profiles.

- Full: https://www.anchorterminal.com/people/anthony-casalena/index.md (~900 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/people/anthony-casalena/index.json · canonical https://www.anchorterminal.com/people/anthony-casalena/
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-28
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Founder, Squarespace.

Anthony Casalena founded Squarespace in 2003 while a student at the University of Maryland, College Park, and launched it as a website builder in January 2004. He was its only developer and employee in its early years.

## What Anthony builds

- [Acuity Scheduling API](https://www.anchorterminal.com/tools/acuity-scheduling.md), graded E, 42.5/100, in Calendars & scheduling. Acuity Scheduling is Squarespace's appointment booking product. Its REST API reads availability, creates, reschedules and cancels appointments, manages clients and blocked time, and sends webhooks, with Basic authentication or OAuth2. Founder, Squarespace, researched 2026-10-28.

## Works with

- [Kurt Freytag](https://www.anchorterminal.com/people/kurt-freytag/), VP of Product, Acuity Scheduling

## Backed by

- [Accel](https://www.anchorterminal.com/investors/accel/)
- [General Atlantic](https://www.anchorterminal.com/investors/general-atlantic/)

## Questions

### Who is Anthony Casalena?

Anthony Casalena founded Squarespace in 2003 while a student at the University of Maryland, College Park, and launched it as a website builder in January 2004. He was its only developer and employee in its early years.

### What does Squarespace make?

Anchor Terminal lists Acuity Scheduling API from Squarespace.

### Who has invested in Squarespace?

The sources our research read name Accel and General Atlantic.

### How are Anthony's tools graded?

Acuity Scheduling API is graded E, 42.5 out of 100, on Anchor Terminal's benchmark, which scores every listing against the same checklist.

## Sources

- https://www.google.com/search?q=Acuity+Scheduling+head+product+2026+LinkedIn
- https://www.linkedin.com/in/kfreytag
- https://acuityscheduling.com/
- https://acuityscheduling.com/about
- https://developers.acuityscheduling.com/
- https://developers.acuityscheduling.com/docs/support
- https://help.acuityscheduling.com/
- https://en.wikipedia.org/wiki/Squarespace
- https://newsroom.squarespace.com/blog/acuity-scheduling-the-online-appointment-scheduling-platform-joins-squarespace

These are the people building the tools we list, named for their public role in the company or project behind a listing, from public pages, with the date it was researched.