{
  "slug": "calibre",
  "category": "ebook-readers",
  "name": "Calibre",
  "description": "Free and open-source e-book manager for organizing, converting and reading e-books, with a built-in viewer, editor and device syncing.",
  "website": "https://calibre-ebook.com",
  "source": "https://github.com/kovidgoyal/calibre",
  "license": "GPL-3.0",
  "platforms": [
    "windows",
    "macos",
    "linux"
  ],
  "jurisdiction": null,
  "pick": false,
  "pick_reason": null,
  "disclosure": null,
  "grade": "D",
  "score": 50,
  "coverage": 100,
  "summary": "Calibre scores 50 out of 100 (grade D) on the ebook readers criteria. It meets 2 of 4 criteria: open source and no ads or data sales. It does not meet no trackers or telemetry and independent audit.",
  "url": "https://privacyratings.com/ebook-readers/calibre/",
  "markdown": "https://privacyratings.com/ebook-readers/calibre/index.md",
  "answers": {
    "open_source": {
      "title": "Open source",
      "weight": 3,
      "answer": "yes",
      "evidence": "https://raw.githubusercontent.com/kovidgoyal/calibre/master/LICENSE",
      "note": "Licensed under GPL-3.0."
    },
    "no_trackers": {
      "title": "No trackers or telemetry",
      "weight": 3,
      "answer": "no",
      "evidence": "https://calibre-ebook.com",
      "note": "The website loads Google Analytics. The desktop app has no analytics."
    },
    "no_ads": {
      "title": "No ads or data sales",
      "weight": 2,
      "answer": "yes",
      "evidence": "https://calibre-ebook.com/donate",
      "note": "Free software funded by donations, with no ads."
    },
    "independent_audit": {
      "title": "Independent audit",
      "weight": 2,
      "answer": "no",
      "evidence": null,
      "note": "No independent audit is published."
    },
    "transparency_report": {
      "title": "Transparency report",
      "weight": 2,
      "answer": "n/a",
      "evidence": null,
      "note": "Only applies to hosted services with a website to test."
    },
    "user_notice": {
      "title": "Tells users about requests",
      "weight": 1,
      "answer": "n/a",
      "evidence": null,
      "note": "Only applies to hosted services with a website to test."
    },
    "tls": {
      "title": "TLS configuration",
      "weight": 2,
      "answer": "n/a",
      "evidence": null,
      "note": "Only applies to hosted services with a website to test."
    },
    "security_headers": {
      "title": "Security headers",
      "weight": 1,
      "answer": "n/a",
      "evidence": null,
      "note": "Only applies to hosted services with a website to test."
    },
    "web_standards": {
      "title": "Modern web standards",
      "weight": 1,
      "answer": "n/a",
      "evidence": null,
      "note": "Only applies to hosted services with a website to test."
    }
  },
  "tests": {
    "ssllabs": null,
    "observatory": null,
    "internetnl_web": null,
    "internetnl_mail": null,
    "trackers": [
      {
        "name": "Google Analytics",
        "host": "inline code",
        "effect": "no"
      },
      {
        "name": "Google Tag Manager",
        "host": "www.googletagmanager.com",
        "effect": "no"
      }
    ],
    "tested_at": "2026-10-01T06:38:48.026Z"
  },
  "last_modified": "2026-10-01T06:56:31Z"
}