Changing an authority threshold or sorting a backlink report should not require downloading the same data again. Save the original API responses, keep their release metadata, and run the comparison locally. The useful part is making sure the files describe comparable observations before treating an absent hostname as a gap.

I maintain crawlgraph . This tutorial uses its JSON response format. The Python CSV comparator also works with compatible referring-host exports from another source, and the included synthetic example needs no account, API key or network access.

Start with a small, reproducible fixture

The runnable Gist contains two standard-library Python scripts and three CSV fixtures.…