usefulweb.site What Changed in This Law?

Contracts, safety & accessibility

What Changed in This Law?

Compare two versions of a law or regulation section by section, with changed numbers and deadlines.

Official source (e.g. gesetze-im-internet.de, eur-lex.europa.eu, legislation.gov.uk).

Try an example: Notice period shortened · German: Frist geändert

How it works

Paste (or link) the old and new versions of a law, regulation, terms of service or policy. The text is split at §, Art. and Section headings, sections are aligned by their number, and every added, removed or modified section is shown with a word-level diff and the numbers, durations and obligation words (must/may/muss/kann…) that changed.

  • Sections start at lines beginning with §, Art./Artikel/Article, Section/Sec. or Paragraph followed by a number; text before the first heading is the preamble.
  • Sections are aligned by their normalised number (LCS over section ids), so renumbered sections show as removed + added.
  • Inside a changed section a word-level LCS diff is computed; numbers, money amounts, percentages, durations and obligation words (must/shall/may, muss/kann/soll/darf…) present in only one version are listed.
  • Whitespace-only differences are ignored.

Not legal advice. This is an automated, rule-based text analysis that can miss or misread clauses; it never claims completeness. For decisions with legal or financial consequences, ask a qualified professional (e.g. a lawyer, tax adviser or consumer advice centre). Always check the official consolidated text and the amending act for transitional provisions.

For scripts and AI agents

  • JSON API: POST https://whatchangedinthislaw.usefulweb.site/api/v1/calculate (same calculation as this page)
  • Interface description: OpenAPI 3.1 · AI guide: llms.txt
  • MCP server (Streamable HTTP): https://whatchangedinthislaw.usefulweb.site/mcp · tool name what_changed_in_this_law
Example request
curl -s -X POST https://whatchangedinthislaw.usefulweb.site/api/v1/calculate \
  -H 'content-type: application/json' \
  -d '{"oldText":"§ 1 Scope\nThis act applies to consumer contracts.\n§ 2 Notice\nThe customer must give notice of termination at least 3 months before the end of the term.\n§ 3 Fees\nA processing fee of 25 EUR may be charged.","newText":"§ 1 Scope\nThis act applies to consumer contracts.\n§ 2 Notice\nThe customer may give notice of termination at any time with a notice period of 1 month.\n§ 3 Fees\nA processing fee of 25 EUR may be charged.\n§ 4 Online cancellation\nProviders must offer a cancellation button on their website.","citation":"Example amendment act","effectiveDate":"2026-12-01"}'

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