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  "markdown": "Founder, Squarespace.\n\nAnthony 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. Squarespace bought Acuity Scheduling in April 2019.\n\n## What Anthony builds\n\n- [Acuity Scheduling API](https://www.anchorterminal.com/tools/acuity-scheduling.md), graded E, 42.5/100, in Calendars \u0026 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.\n\n## Works with\n\n- [Kurt Freytag](https://www.anchorterminal.com/people/kurt-freytag/), VP of Product, Acuity Scheduling\n\n## Backed by\n\n- [Accel](https://www.anchorterminal.com/investors/accel/)\n- [General Atlantic](https://www.anchorterminal.com/investors/general-atlantic/)\n\n## Questions\n\n### Who is Anthony Casalena?\n\nAnthony 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. Squarespace bought Acuity Scheduling in April 2019.\n\n### What does Squarespace make?\n\nAnchor Terminal lists Acuity Scheduling API from Squarespace. 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.\n\n### Who has invested in Squarespace?\n\nThe sources our research read name Accel and General Atlantic.\n\n### How are Anthony's tools graded?\n\nAcuity Scheduling API is graded E, 42.5 out of 100, on Anchor Terminal's benchmark, which scores every listing against the same checklist.\n\n## Sources\n\n- https://www.google.com/search?q=Acuity+Scheduling+head+product+2026+LinkedIn\n- https://www.linkedin.com/in/kfreytag\n- https://acuityscheduling.com/\n- https://acuityscheduling.com/about\n- https://developers.acuityscheduling.com/\n- https://developers.acuityscheduling.com/docs/support\n- https://help.acuityscheduling.com/\n- https://en.wikipedia.org/wiki/Squarespace\n- https://newsroom.squarespace.com/blog/acuity-scheduling-the-online-appointment-scheduling-platform-joins-squarespace\n\nThese 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. They don't work for Anchor Terminal (our own team is on the about page, /about/#author). We show public roles, public profiles and what the listing pages show, nothing private. To correct something, send an about or a photo, or have a page removed, write to privacy@anchorterminal.com.\n",
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