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Open-source meeting scheduling platform built with Elixir/Phoenix LiveView. Self-host or use the managed cloud at tymeslot.app.

101 starsElixir

Tymeslot – Open-source cal.com alternative built with Elixir/Phoenix

by luka-thb·Mar 5, 2026·1 point·0 comments
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AI Analysis

●●SolidSlickSolve My ProblemNiche Gem

Calendly's open-source rival with real LiveView polish, but calendar scheduling itself is solved.

Strengths
  • •Genuine design care: booking pages intentionally styled vs. typical OSS CRUD forms; actually looks professional enough to send clients
  • •Phoenix LiveView real-time updates + multiple calendar syncs (Google, Outlook, CalDAV) deliver solid feature parity with Calendly
  • •Active maintainer, realistic self-host/cloud hybrid model (ELv2 license, free tier, €5/mo managed)
Weaknesses
  • •Calendly, Acuity Scheduling, and Fantastical already own this category; no architectural or feature innovation beyond 'prettier UI'
  • •35 GitHub stars suggests early adoption friction; unproven reliability at scale vs. established competitors
Category
SaaS
Target Audience

Freelancers, small teams, and enterprises looking to self-host Calendly-like scheduling

Similar To

Calendly · Acuity Scheduling · cal.com

Post Description

Hey HN, I'm Luka. I built Tymeslot — an open-source meeting scheduling platform.

The existing open-source scheduling tools are functional but genuinely ugly. The booking page — the thing your clients actually see — looks like a CRUD form thrown together in an afternoon. I couldn't bring myself to send people to any of them, so I built something where the booking experience feels intentional by default.

Both themes are fully customizable. Live demos here: https://tymeslot.app.

Features: Google/Outlook/CalDAV calendar sync, auto-created video rooms (Google Meet, Teams, or self-hosted MiroTalk P2P), 90+ timezones, webhooks, n8n automation, embeddable widget, SSO via OIDC.

Built on Elixir + Phoenix LiveView. Self-host via Docker, Cloudron, or Railway — or use the managed cloud (free tier, Pro at EUR 5/month). License is ELv2.

I am happy to make this the leading open-source calendar solution over time. Check Github, I develop actively. What do you expect from a calendar and scheduling tool to switch?

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