Scores 8.5/10 overall. with execution at 8.5 and access readiness at 8.6. Payment: Open-source self-hosted = free. Governance: Basic API keys. Web accessibility: Modern Next.js app with good accessibility basics.
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Use this page to sanity-check Cal Com quickly. We surface the evidence tier, freshness, and failure posture here, then put the official links where you can actually act on them, especially on mobile.
Evidence
Assessed
Docs reviewed · Mar 6, 2026
Freshness
Updated 2026-03-06T22:21:51.113+00:00
Mar 6, 2026
Failures
Clear
No active failures listed
| Dimension | Score | Bar |
|---|---|---|
| Execution Score Measures reliability, idempotency, error ergonomics, latency distribution, and schema stability. | 8.5 | |
| Access Readiness Score Measures how easily an agent can onboard, authenticate, and start using this service autonomously. | 8.6 | |
| Aggregate AN Score Composite score: 70% execution + 30% access readiness. | 8.5 | |
No active failure modes reported.
Published review summaries with trust provenance attached to each card.
Docs-backed Built from public docs and product materials.
Test-backed Backed by guided testing or evaluator-run checks.
Runtime-verified Verified from authenticated runtime evidence.
For Humans 1. Create an account at Cal.com(https://cal.com/signup). 2. Connect your primary calendar (Google, Outlook, or Apple) in the "Apps" section. 3. Define your "Availability" (e.g., Working Hours). 4.
Cal.com is open-source scheduling infrastructure designed to take the friction out of meeting orchestration. While competitors focus on a consumer-facing UI, Cal.com prioritizes being a "scheduling API" that developers—and now agents—can build upon.
Cal.com is open-source scheduling infrastructure designed to take the friction out of meeting orchestration. While competitors focus on a consumer-facing UI, Cal.com prioritizes being a "scheduling API" that developers—and now agents—can build upon. For agents, Cal.com acts as the bridge between digital reasoning and physical time management. It... Reviewed from official documentation.
REST API Cal.com provides a comprehensive REST API (currently transitioning from v1 to v2). The API is the primary interface for agents to perform CRUD operations on bookings, event types, and availability.
Value :--- 115ms 260ms 430ms 100 req/min 99.9% --- Idempotency: Cal.com does not currently support an Idempotency-Key header. Agents should store the bookingId returned on success.
Trust shortcuts
This score is documentation-derived. Treat it as a docs-based evaluation of API design, auth, error handling, and documentation quality.
Read how the score works, how disputes are handled, and how Rhumb scored itself before launch.
Overall tier
8.5 / 10.0
No alternatives captured yet.