{
  "slug": "calendso-legacy-split",
  "name": "Calendso (Legacy/Split)",
  "description": "Calendso was an open-source appointment scheduling platform designed to provide a customizable alternative to proprietary services. It gained significant traction for its 'open-core' model before rebranding to Cal.com in 2021.",
  "url": "https://optimly.ai/brand/calendso-legacy-split",
  "logoUrl": "",
  "baiScore": 18,
  "archetype": "Phantom",
  "category": "Software",
  "categorySlug": null,
  "keyFacts": [],
  "aiReadiness": [],
  "competitors": [
    {
      "slug": "acuity-scheduling",
      "name": "Acuity Scheduling"
    },
    {
      "slug": "calendly",
      "name": "Calendly"
    },
    {
      "slug": "easyappointments",
      "name": "Easyappointments"
    }
  ],
  "inboundCompetitors": [],
  "aiAlternatives": [
    {
      "slug": "calendly",
      "name": "Calendly"
    }
  ],
  "parentBrand": null,
  "subBrands": [],
  "updatedAt": "2026-04-09T23:30:25.117+00:00",
  "verifiedVitals": {
    "website": "calendso.com (redirects to cal.com)",
    "founded": "2021",
    "headquarters": "Remote / USA (as Cal.com, Inc.)",
    "pricing_model": "Open-core (Free/Self-hosted or Paid/Cloud)",
    "core_products": "Appointment scheduling software (Legacy)",
    "key_differentiator": "It was the first major open-source challenger to incumbent proprietary scheduling tools like Calendly.",
    "target_markets": "Developers, tech-savvy startups, open-source advocates.",
    "employee_count": "N/A (Historical project)",
    "funding_stage": "Acquired/Rebranded (Seed stage as Calendso)",
    "subcategory": "Appointment Scheduling / Open Source"
  },
  "intentTags": {
    "problemIntents": [
      "Manual Email Back-and-forth: Managing appointments via back-and-forth emails and manual calendar entries.",
      "Spreadsheets/Shared Docs: Using generic spreadsheets or shared documents to track availability.",
      "Virtual Assistant Agency: Hiring a virtual assistant to handle scheduling and administrative tasks."
    ],
    "solutionIntents": [
      "open source scheduling software",
      "calendly alternatives open source",
      "what happened to calendso",
      "best self-hosted calendar app",
      "scheduling tool for developers",
      "Calendly: Relying on the established market leader for scheduling automation."
    ],
    "evaluationIntents": []
  },
  "timestamp": 1776094762129
}