FEATURE
CAL.COM
FILLOUT
OVERALL_SCORE
24/50
26/50
API_QUALITY
EXCELLENT ████
EXCELLENT ████
API_SCORE
10/10
8/10
GTM_RELEVANCE
14/20
18/20
CATEGORY
CRM & SALES
FORMS & LEAD CAPTURE
PRICING
FREEMIUM
FREEMIUM
FREE_TIER
[YES]
[YES]
REST_API
[YES]
[YES]
WEBHOOKS
[YES]
[YES]
GRAPHQL
[---]
[---]
OAUTH
[---]
[---]
COMPLEXITY
HARD
EASY
LEARNING
EASY
EASY
WEBHOOK_REL
EXCELLENT
EXCELLENT
// VERDICT
OVERALL_SCORE:FILLOUT
API_QUALITY:CAL.COM
GTM_RELEVANCE:FILLOUT
EASE_OF_USE:FILLOUT
VALUE (FREE):TIE
Strengths & Weaknesses
Cal.com
Exceptionally generous free plan with unlimited bookings, event types, calendars, and workflows—far more than Calendly's single event type limitation
Open-source with full self-hosting option under AGPLv3, providing complete data ownership and transparency
Comprehensive API, webhooks, and React components (Atoms) for embedding scheduling into custom applications
Enterprise compliance certifications including SOC 2, ISO 27001, and HIPAA on higher tiers
Self-hosting requires DevOps expertise with Node.js, PostgreSQL, and Docker infrastructure
Advanced features like workflows and routing have a steeper learning curve than simpler competitors
No native Android mobile app yet (iOS only, plus responsive web)
Fillout
Native integrations with 50+ platforms including Airtable, Salesforce, HubSpot for seamless data sync without middleware
Built-in scheduling, payments, signatures, and PDF generation eliminate need for multiple tools
Advanced customization options including custom CSS, white-labeling, custom domains, and full brand control
Comprehensive API with webhooks, submission management, and form metadata endpoints for programmatic access
No GraphQL API support limits flexibility for complex data querying needs
SDK availability not documented, requiring custom REST API implementation
Rate limits are not publicly documented which may cause issues at scale