See exactly what changed between two versions of a rule
USLege compares any two stored versions of an agency rule, such as proposed and adopted or last year and today, and shows the changes in order with the surrounding text, so you read the difference instead of two long documents.
Animated illustration with example names and data.
The sentence that changed is the one your client cares about
A rule can change between proposal and adoption in a single sentence. Finding it by reading two long documents, or by comparing a PDF to a web page, is slow and easy to get wrong, and the comment window will not wait for you.
The difference between a proposed rule and the final rule
This is a real comparison of two versions of a federal rule, published October 26, 2026. USLege found 22 changes. Three are shown.
Real text from the Federal Register, shortened to three of 22 changes. Most rules have a single version on file; a redline appears when a rule has two.
From the rule to the redline in three steps
Find the rule
Search by agency, code section, stage, comment deadline, or the words inside the rule itself.
Pick two versions
Choose an older and a newer version, or leave off the newer one to compare against the current text.
Read the redline
See each change in document order, with the unchanged lines around it for context.
Read the change, not the whole rule
A redline you can trust
Sentence-level comparison
Changes are shown in document order with a couple of unchanged lines around each one, so you see what moved in context.
HTML, text, and PDF
Versions compare as text, so a web notice and a PDF of the same wording show as identical instead of flagging formatting noise.
Compare to the current text
Leave off the newer version and USLege compares your older version against what is in force now.
The full life of a rule
Proposed, comment open, final, adopted, emergency, effective, withdrawn, or repeal, with the comment window dates and the citation.
Search inside the rules
Find every rule that actually says something, not just the ones whose titles mention it, by searching the text of the rule itself.
Filter by agency and code section
Narrow by issuing agency, code division or section, stage, or comment deadline.
State and federal rules
Agency rulemaking from 49 states and the federal government, in one place.
Honest about what it cannot read
If a version is a scanned image that cannot be read, USLege says so instead of guessing at the change.
Ask what changed, get the redline
Rule comparison is part of USLege MCP, so the answer comes back in the conversation you are already in.
Examples. Works from Claude, ChatGPT, and other AI tools connected to USLege MCP.
For teams that answer to the rulebook
What do teams ask about rule version comparison?
How do I compare two versions of an agency rule? +
Can it compare a PDF to a web version? +
Does every rule have a redline? +
Which states are covered? +
Can I ask for a redline from Claude or ChatGPT? +
Read the change, not the whole rule
Name an agency or a rule your team is watching. In a few minutes we will show you its history and what changed. Want the wider picture first? See regulatory tracking or the full USLege platform.
Just comparing options? See pricing →Check out this intelligence report.
A full AI-policy intelligence report across all 50 states: curated AI bills, an AI-Friendliness Index for every state, verified legislative hearing clips in a growing set of states, and the sponsors driving both sides of the debate. This is the type of report USLege builds fast.