The Open-Source Alternative to Calendly

Enterprise-grade meeting scheduling platform built with Elixir & Phoenix LiveView

🚀 Try Cloud Version · 📖 Documentation · 🐛 Report Bug

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🎯 Why Choose Tymeslot?

🔓 Open Source (ELv2)

Fork, audit, contribute — or just use it. No vendor lock-in, ever.

🏠 Your Data, Your Rules

Self-host on Docker/Cloudron or use our managed cloud.

🆓 Full-Featured Free Tier

Everything you need to get started. Forever. No credit card required.

🔒 Privacy-First

No tracking pixels, no data mining, no selling your data.

🎨 Professional Templates

Responsive email designs with calendar attachments.

⚡ Built for Performance

Real-time updates with Phoenix LiveView. Blazing fast.

🔌 Integrations

Calendar Providers (6)

Google Calendar · Outlook · CalDAV · Nextcloud · Radicale · Zimbra

Video Conferencing (5)

Google Meet · Microsoft Teams · MiroTalk P2P · In-Person / Phone · Custom Links

💰 Simple, Transparent Pricing

🆓 Free Forever — Self-Hosted or Cloud

• ✅ Unlimited bookings & meeting types
• ✅ All 6 calendar providers
• ✅ All 5 video platforms
• ✅ Multi-language (EN, DE, UK)
• ✅ Webhooks & embedding
• ✅ Advanced reminders
• ✅ Community support

Perfect for: Individuals, small teams, self-hosters

⭐ Pro Tier — €5/month · Cloud Only

• ✅ Everything in Free
• ✅ Priority support
• ✅ Support open-source development
• ✅ Early access to new features

Perfect for: Professional businesses, agencies

Get Started →

Self-Hosting: Always free. Deploy on Docker, Cloudron, or bare metal — no licensing fees, ever.

✨ Feature Highlights

🔐 Authentication & Users

• Multi-provider OAuth (Google, GitHub)
• Generic OAuth/OIDC SSO (Keycloak, Authentik, Okta, Azure AD, etc.)
• Email/password with verification
• Customizable profiles & avatars
• 4-step onboarding flow

🧠 Smart Scheduling

• 90+ timezone-aware cities
• Custom business hours & breaks
• Real-time conflict detection
• Configurable meeting types

📅 Calendar Sync

• 6 calendar providers
• Full CRUD operations
• Auto token refresh
• Calendar discovery

🎥 Video Conferencing

• 5 video providers
• Auto room creation
• Role-based access
• OAuth integration

📧 Email System

• Professional templates (MJML)
• 5 notification types
• Calendar attachments
• Delivery tracking

🔒 Security

• Rate limiting
• AES encryption
• XSS protection
• Circuit breakers

🌍 Internationalization

• 3 languages (EN, DE, UK)
• Auto browser detection
• Localized booking pages
• DST handling

🔗 Embedding

• Secure iframe widgets
• Domain restrictions
• Webhook notifications
• Customizable pages

⏰ Reminders

• Unlimited per meeting
• Flexible timing
• Email notifications
• Automatic retry

📸 Screenshots

Dashboard & Management

Availability & Scheduling

Embedded Booking Widget

🆚 Tymeslot vs Calendly

Feature	Tymeslot	Calendly
Open Source	✅ Yes	❌ No
Self-Hosting	✅ Free Forever	❌ Not Available
Data Privacy	✅ Your Infrastructure	❌ Their Servers
Unlimited Bookings	✅ Free Tier	❌ Paid Only
Calendar Providers	6 Providers	3 Providers
Video Providers	5 Providers	3 Providers
Multi-Language	✅ 3 Languages	✅ Multiple
Webhooks	✅ Free Tier	❌ Paid Only
Embedding	✅ Free Tier	✅ Available

💼 Perfect For

👨‍💼 Freelancers & Consultants

Replace endless email chains with professional booking pages.

🏢 Small Businesses

Coordinate team availability without enterprise pricing.

🔒 Privacy-Conscious Orgs

Keep scheduling data on your own infrastructure.

🌍 International Teams

Multi-language support for global customer bases.

💻 Developers & Tech Teams

Extensible platform with webhook integrations.

📖 Open Source Projects

Embed booking widgets in your documentation.

🛠️ Built With

Backend: Elixir 1.19 · Phoenix 1.8 · Phoenix LiveView 1.1 · Oban Database: PostgreSQL 14+ · Ecto SQL Frontend: Tailwind CSS · ESBuild · Alpine.js Email: Swoosh · MJML Templates Infrastructure: Docker · Cloudron Ready

🚀 Getting Started

☁️ Cloud

Try Now → — Zero setup · Start in 60 seconds

🐳 Docker

Guide → — Self-hosting · Full control

📦 Cloudron

Guide → — One-click install · Managed platform

🚂 Railway

Deploy → — One-click cloud deploy · No server management

🐳 Quick Start (Docker Image)

If you already have Docker installed, you can pull and run the image in one step:

docker run --name tymeslot \
  -p 4000:4000 \
  -e SECRET_KEY_BASE="$(openssl rand -base64 64 | tr -d '\n')" \
  -e PHX_HOST=localhost \
  -v tymeslot_data:/app/data \
  -v tymeslot_pg:/var/lib/postgresql/data \
  youruser/tymeslot:latest

This command pulls the image automatically if it is not present locally. For a full Docker guide, see README-Docker.md.

🤝 Contributing

⭐ Star the Repo

Star → — Help others discover Tymeslot.

💰 Support Development

Subscribe → — Fund open-source development.

🐛 Report Issues

Open Issue → — Bugs & feature requests.

💻 Contribute Code

Guidelines → — Local setup, development workflow & PR process.

🛡️ Security

Built-in Protection

• ✅ Input sanitization & XSS protection
• ✅ AES encryption for credentials
• ✅ Rate limiting & IP protection
• ✅ Security headers (CSP, HSTS, CSRF)
• ✅ Spam protection (honeypot + reCAPTCHA v3)
• ✅ Regular dependency updates

Spam Protection

Protect signup and booking forms from bots:

• Honeypot: Invisible field catches automated bots
• reCAPTCHA v3: Google's invisible bot detection (optional)

Enable in your environment:

export RECAPTCHA_SITE_KEY="your_key"
export RECAPTCHA_SECRET_KEY="your_secret"
export RECAPTCHA_SIGNUP_ENABLED="true"
export RECAPTCHA_BOOKING_ENABLED="true"

Get keys at Google reCAPTCHA

Registration Control

Disable new user sign-ups without taking down the app — useful for invite-only or closed deployments. Defaults to true (registration open) when the variable is unset.

When disabled:

• The sign-up page and "Sign up" link are hidden
• Email and OAuth registration attempts are rejected with an informative message
• Existing users can still log in normally

How to set REGISTRATION_ENABLED=false depends on your deployment:

Deployment	How to set it
Local dev	Add REGISTRATION_ENABLED=false to your .env file and export it before starting the server, or run export REGISTRATION_ENABLED=false directly
Docker Compose	Add REGISTRATION_ENABLED=false to your .env file — it is forwarded to the container automatically
docker run	Pass -e REGISTRATION_ENABLED=false, or use --env-file .env to load your .env file
Railway	Set REGISTRATION_ENABLED to false in the Railway dashboard under Variables
Cloudron	Set REGISTRATION_ENABLED to false in the Cloudron app settings

Password Authentication Control

Disable email/password login entirely and require OAuth — useful for SSO-only deployments (Keycloak, Authentik, Google Workspace, etc.) where you want to enforce identity-provider authentication. Defaults to true (password auth enabled) when the variable is unset.

When disabled:

• The login form, sign-up page, and password reset flow are hidden
• Direct POST /auth/session requests are rejected with an error redirect
• Password-based registration and reset attempts return an informative error
• OAuth login and registration continue to work normally
• Existing users with passwords can still sign in via OAuth if configured

How to set PASSWORD_AUTH_ENABLED=false depends on your deployment:

Deployment	How to set it
Local dev	Add PASSWORD_AUTH_ENABLED=false to your .env file and export it before starting the server, or run export PASSWORD_AUTH_ENABLED=false directly
Docker Compose	Add PASSWORD_AUTH_ENABLED=false to your .env file — it is forwarded to the container automatically
docker run	Pass -e PASSWORD_AUTH_ENABLED=false, or use --env-file .env to load your .env file
Railway	Set PASSWORD_AUTH_ENABLED to false in the Railway dashboard under Variables
Cloudron	Set PASSWORD_AUTH_ENABLED to false in the Cloudron app settings

Report Vulnerabilities

Use our contact page for security issues.

📄 License

This project is licensed under the Elastic License 2.0 - see the LICENSE file for details.

🏢 About

Tymeslot is developed by:

• Luka Karsten Breitig
• Diletta Luna OÜ
• Sepapaja 6, 15551 Tallinn, Estonia

💬 Community & Support

• 💬 Join Discussions — Get help from the community
• 🐛 Report Bugs — Help us improve
• 💡 Request Features — Share your ideas
• 📧 Contact Us — Business inquiries
• ⭐ Star on GitHub — Show your support

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Built with ❤️ using Elixir, Phoenix, and LiveView
Made by Luka Karsten Breitig · Diletta Luna OÜ · Tallinn, Estonia