Calendar application designed to sync Google Calendar with Notion
- Fast bidirectional sync with Google Calendar
- Deep integration with Notion pages and databases
- Minimalist user interface optimized for quick shortcuts
Zero-Cost Entry9 tools audited
Free Calendar & Meeting Scheduling & Open Source Software
Technical selection of platforms without financial barrier to entry: permanent free tiers, self-hosted projects, and open-source alternatives.
Free Limits & Commercial Threshold Matrix
Exact breakdown of quotas, credit card requirements, and commercial allowances before requiring an upgrade.
| Tool | Model | Conditions | Free Tier Details | SSO Tax | Action |
|---|---|---|---|---|---|
| Notion Calendar | Free | No credit card requiredCommercial use allowedUnlimited usage with no expiration | Acceso gratuito completo a las funcionalidades de calendario dentro del ecosistema de Notion. | Standard | Try |
| Cal.com | Freemium | No credit card requiredCommercial use allowedMonthly recurring quota reset | Incluye herramientas de programación básicas y sincronización de calendarios para uso individual. | Single Sign-On Tax (Enterprise SAML) | Try |
| Calendly | Freemium | No credit card requiredCommercial use allowedUnlimited usage with no expiration | Acceso permanente gratuito con 1 tipo de evento activo por usuario, integraciones básicas de calendario y enlaces de reserva estándar. | Single Sign-On Tax (Enterprise SAML) | Try |
| TickTick | Freemium | No credit card requiredCommercial use allowedUnlimited usage with no expiration | Acceso ilimitado a funciones básicas de tareas, listas y recordatorios sin necesidad de tarjeta de crédito. | Standard | Try |
| Standflow | Free | No credit card requiredCommercial use allowedUnlimited usage with no expiration | Standflow es completamente gratuita e indefinida en todas sus funciones mediante la Mac App Store. | Standard | Try |
| SimplyBook.me | Freemium | No credit card requiredCommercial use allowedMonthly recurring quota reset | Incluye hasta un número limitado de reservas mensuales y características básicas sin necesidad de tarjeta de crédito. | Standard | Try |
| Setmore | Freemium | No credit card requiredCommercial use allowedMonthly recurring quota reset | El plan gratuito cubre hasta 4 usuarios y citas ilimitadas al mes sin coste inicial. | Standard | Try |
| Reclaim | Freemium | No credit card requiredCommercial use allowedMonthly recurring quota reset | Plan gratuito permanente con límites de integraciones y funciones básicas para uso individual. | Single Sign-On Tax (Enterprise SAML) | Try |
| When2meet | Free | No credit card requiredCommercial use allowedUnlimited usage with no expiration | El servicio es completamente gratuito de forma indefinida para todos los usuarios sin restricciones ocultas. | Standard | Try |
Audited Free & Freemium Platforms (9)
Open scheduling infrastructure and scheduling API for individuals and teams.
- Highly customizable scheduling infrastructure
- Extensive app marketplace and integrations
- Comprehensive developer API and React components
49.4kstars on GitHub
Automated meeting scheduling and agenda management platform for professional teams.
- Enables automatic synchronization with multiple calendars to prevent overlaps
- Offers advanced routing and lead qualification workflows
- Includes built-in tools for payment processing and AI meeting notes
Comprehensive task management, calendar, and habit tracking platform for professionals.
- Smooth and real-time synchronization across multiple platforms and devices
- Native integration of task management, calendar views, and Pomodoro timers
- Advanced habit tracking functionality and productivity statistics
Standing desk timer for macOS with customizable posture cycles in the menu bar.
- Lightweight macOS menu bar utility with low resource consumption
- Highly customizable posture cycles for sitting, standing, and movement
- Native support for Apple Silicon architecture and macOS 13 or later
Modular online appointment booking system for service businesses.
- Highly modular model allowing features to be enabled as the business grows.
- Wide variety of automated notification channels including WhatsApp and SMS.
- Ready-to-use dedicated mobile-optimized booking website.
Online appointment scheduling software with custom booking pages and payment integrations
- Permanent free tier supporting multiple users and unlimited monthly appointments
- Native integration with major payment gateways and video conferencing tools
- Customizable branded booking page for client self-service
AI-powered smart calendar for teams to automate tasks, habits, and meetings.
- Intelligent automation of focus blocks and tasks in corporate calendars
- Advanced two-way synchronization between multiple Google and Outlook accounts
- Detailed analytics on time usage and work-life balance metrics
Free web-based tool for coordinating group meeting times through overlapping availability matrices.
- Extremely lightweight web interface with no mandatory signup friction.
- Ideal for quick availability polls in distributed teams.
- Completely free model with no paywalls on basic features.