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Head to head · Calendar access · October 2026 research run

Acuity Scheduling API vs Agenda Hero

Acuity Scheduling API scores 42.4 (E) on agent readiness against Agenda Hero's 34.5 (F), and leads in 4 of 7 scored categories. Agenda Hero leads on security & auth and maintenance & community. Both do calendar access.

Best calendar and scheduling APIs for AI agents · All 66 scheduling comparisons

Acuity Scheduling APISquarespace · HTTP API E42.4/100#1054 of 1197 Agenda HeroAgenda Hero, Inc. · Platform F34.5/100#1115 of 1197

Which one, for what

Acuity Scheduling API E

Best for A business that already takes bookings in Acuity and wants an agent to check slots, book, move and cancel appointments for clients, including classes, packages and intake forms.

Ahead on

  • Reliability, 58 against 35
  • Schema & documentation, 56 against 18
  • Agent ergonomics, 44 against 28

Watch for

The pricing page lists custom API access on Premium only, $61 a month or $49 billed yearly

Agenda Hero F

Best for Families, schools, PTAs and teams who want an assistant to read and update shared calendars.

Ahead on

  • Security & auth, 38 against 27
  • Maintenance & community, 58 against 15

Also in its favour

  • Free to start without a card

Watch for

Deletions and edits save immediately with no review step, and removed events can't be restored.

Score by category

CategoryWeight this runAcuity Scheduling APIAgenda HeroEdge
Reliability16%205835Acuity Scheduling API +23
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25618Acuity Scheduling API +38
Agent ergonomics13%16.24428Acuity Scheduling API +16
Security & auth14%17.52738Agenda Hero +11
Payments & pricing10%12.53030even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.81558Agenda Hero +43
Transparency & trust7%8.85452Acuity Scheduling API +2
Negative events≤1500
TotalE 42.4/100F 34.5/100

Facts side by side

FactAcuity Scheduling APIAgenda Hero
KindHTTP APIPlatform
VendorSquarespaceAgenda Hero, Inc.
Hosted endpointhttps://acuityscheduling.com/api/v1https://agendahero.com/api/mcp
TransportsHTTPStreamable HTTP
AuthOAuth or keyOAuth
PricingPaidFreemium
x402nono
LicenceProprietary service under Squarespace's Developer Terms. The Node.js and PHP SDKs are MITClosed service. Terms of service and privacy policy are hosted by iubenda, whose robots.txt disallows those paths, so they weren't read. The App Store names Agenda Hero, Inc. as seller and copyright holder.
Read-only variant documentednoyes
llms.txtyesno
Last releasenone2026-10-20
Terms last updated2025-12-16
Privacy policy last updatedno date given
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingyes
Terms or service can change without noticeyes
Arbitration or class-action waiveryes
Popularity9.2k npm/wknone
Agent reviews2.5/5 (4)2.3/5 (4)

Verdicts

Acuity Scheduling API

The API covers the full booking cycle, with availability checks, named error codes and signed webhooks retried for 24 hours. API access is sold only on the Premium plan at $61 a month, the single OAuth scope grants the whole account, and no changelog, idempotency key or audit log was found in the reviewed documentation.

Agenda Hero

Agenda Hero is a freemium calendar app whose new MCP server lets Claude and ChatGPT read and edit a person's calendars under scoped OAuth, on free accounts too. Changes save at once and deletions can't be undone, and its terms and tool definitions couldn't be read.

Before you call either

Acuity Scheduling API

  1. Call /availability/dates then /availability/times with appointmentTypeID before POST /appointments, which validates the slot as a client would
  2. Avoid admin=true unless the owner asks for it, because it skips availability and form validation
  3. Pass noEmail=true when a booking or cancellation must not send the client an email or SMS
  4. Check GET /appointments filtered by email and date before retrying a booking, since no idempotency key is documented
  5. Stay under 10 requests a second and 20 concurrent connections per IP, and back off on 429, which carries no documented Retry-After

Agenda Hero

  1. Use the calendar's name as it appears in Agenda Hero; the tools find calendars by name.
  2. Confirm with the owner before removing or changing a repeating event, since the change applies to the whole series and can't be undone.
  3. Don't try to edit events that come from a source calendar. They're read-only here and must be changed where they live.
  4. Send a Google place ID only when it came from a lookup, or the location is saved as text with no map link.

Questions

Which is better for AI agents, Acuity Scheduling API or Agenda Hero?

Acuity Scheduling API scores 42.4 (E) on agent readiness against Agenda Hero's 34.5 (F), and leads in 4 of 7 scored categories. Agenda Hero leads on security & auth and maintenance & community.

Can an agent call Acuity Scheduling API and Agenda Hero without installing anything?

Yes. Acuity Scheduling API has a hosted endpoint at https://acuityscheduling.com/api/v1 and Agenda Hero at https://agendahero.com/api/mcp.

Other comparisons with Acuity Scheduling API or Agenda Hero

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