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GPL 3.0 vs LGPL 3.0: what is the difference?

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TL;DR: GPL 3.0: commercial use, modification, redistribution: Yes. LGPL 3.0: the same uses: Yes. GPL 3.0: Run, study, change and share the software, including commercially. If you convey it or a work based on it, you must do so under the GPL with the corresponding source. LGPL 3.0: Use the library in any program, including proprietary ones; changes to the library itself, when conveyed, stay under the LGPL with source, and users must be able to relink a modified version.

Is gPL 3.0: commercial use, modification, redistribution allowed under GNU General Public License v3.0?

Yes. Every use you described is granted by GPL 3.0, and nothing you described is prohibited.

License: GNU General Public License v3.0 (GPL-3.0-only, curated)

Duties: attribution, license_notice, state_changes, share_alike, source_disclosure

Is lGPL 3.0: the same uses allowed under GNU Lesser General Public License v3.0?

Yes. Every use you described is granted by LGPL 3.0, and nothing you described is prohibited.

License: GNU Lesser General Public License v3.0 (LGPL-3.0-only, curated)

Duties: attribution, license_notice, share_alike, source_disclosure

How do GPL-3.0-only and LGPL-3.0-only compare?

The table lists each license's duties and notes side by side.

LicenseDutiesNotes
GPL-3.0-onlyattribution, license_notice, state_changes, share_alike, source_disclosureSublicensing is not allowed; every recipient receives a license from the original licensors (sections 2 and 10). Running the software, including as a network service, does not by itself trigger the duty to share source; conveying copies does.
LGPL-3.0-onlyattribution, license_notice, share_alike, source_disclosureThe copyleft duties apply to the library and modified versions of it, not to an application that only links to it.

Combined in one work: compatible.

What else should I know?

What are the sources?

How can I check it myself (free, no key)?

{
  "tool": "check_license",
  "arguments": {
    "license": "GPL-3.0-only",
    "intended_use": {
      "commercial_use": true,
      "modification": true,
      "redistribution": true
    }
  }
}

Computed from a2ally's license profiles; not legal advice. JSON · Markdown

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export A2ALLY_API_KEY=rs_...   # the api_key from the reply (shown once)
curl -s https://www.a2ally.com/v1/licenses/check -H "Authorization: Bearer $A2ALLY_API_KEY" \
  -H "Content-Type: application/json" -d '{"license":"MIT","intended_use":{"commercial_use":true}}'
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