Competitor AdWords keyword spying tool.

For spying on competitor Google AdWords/Ads keywords, a few tools come up a lot in that thread and beyond, SpyFu and SEMrush are the go-to choices that actually show what terms competitors are bidding on, estimated CPC, and even ad copy history. Ahrefs, Ubersuggest, iSpionage, and KeywordSpy also get recommended for similar PPC keyword insights. Most of these aren’t perfect (all use estimated data), but they give you a good picture of which paid terms your rivals are targeting so you can plan smarter campaigns rather than guessing.

WhatRunsWhere — alternative PPC spying with ad placements data

Try Semrush or Ahrefs, both are solid for spying competitor PPC keywords.

There’s no tool that lets you “spy” on exact Google Ads campaigns, but several platforms estimate competitors’ paid keywords and ad copies based on historical data. You can try SEMrush or SpyFu — both are commonly used for PPC competitor research.

Just keep in mind the data is modeled/estimated, so it’s better to compare results from more than one tool before making decisions.