Negative keywords tell Apple Ads which searches you do not want to buy. They matter because discovery campaigns can match your app to terms that look close but convert poorly.
For small budgets, negatives are not a cleanup detail. They are how you stop a discovery campaign from spending on curiosity, wrong-platform searches, support queries, competitor names you cannot convert, or broad words that teach you nothing.
Add negatives for wrong intent
If users are searching for a different platform, category, feature, price expectation, or competitor you do not want to target, add the term as a negative.
Examples: an iOS-only app may negative Android terms. A paid professional app may negative “free” if that traffic never converts. A cycling weather app may negative generic “weather radar” if searchers want a broad weather app. The point is to protect intent.
Use negatives after reading search terms
Do not guess a huge negative list before the campaign starts. Let the search terms report show the waste, then cut it.
Review search terms on a schedule. Sort by spend, taps, installs, and downstream quality where you have it. A term with spend and no useful action is a candidate negative. A term with low spend but clearly wrong intent can be cut early.
Protect exact-match campaigns
Exact-match winners should stay focused. Use negatives to prevent broad discovery from competing with your controlled winner campaigns.
If a search term proves itself, move it into an exact-match campaign where you can control bid and budget. Then add it as a negative in the discovery ad group if needed, so broad matching does not keep buying the same term less cleanly.
Keep ASO learning clean
If irrelevant terms keep spending, they pollute your understanding of demand. Cleaner paid data makes metadata and screenshot decisions cleaner too.
Use match type intentionally
Negative exact blocks one specific query. Negative broad can block a wider theme. Use exact when the term is only bad in one form. Use broad when the whole intent family is wrong.
Do not negative too aggressively
A term can look weak before it has enough data. If the intent is relevant but early performance is unclear, lower bids or keep watching instead of cutting too fast. Negative keywords are for waste and wrong intent, not every underperforming term after one tap.