Compare the verified source of two contracts, line by line.
Pulls the verified source for each address from the block explorer and runs a standard line-level diff — the same kind of comparison you’d get from git diff, just for two on-chain contracts that were never in the same repo.
Both contracts’ verified source is fetched, flattened into one text block each (multi-file contracts get every file concatenated, labeled), then compared line by line — added lines in green, removed lines in red.
Common cases: checking what actually changed in a new proxy implementation before it's upgraded, verifying a "new" token isn't just a renamed clone of a known scam contract, or confirming two deployments across chains are really the same code.
The diff needs both sides' actual source code, so an unverified contract can't be compared — you'll see which one is missing it.
Yes — this is a straightforward line-by-line text diff, not a semantic/AST-aware comparison. Reformatting, comment changes, or reordered (but functionally identical) code will show up as differences even if the compiled behavior is unchanged.