Instacart's ad engine gets a spelling overhaul

Instacart rebuilt how it matches shoppers with ads. The old system scored ads against a shopper's query. The new one uses spelling-aware retrieval — think of how Google fixes "sugar" when you type "sugr" — so ads surface even when shoppers misspell. The change is in the retrieval layer, where Instacart decides which ads to bring into view before any ranking happens.

The shift from pure scoring to spelling-aware matching is a move closer to how people actually search. Shoppers don't type like databases. They type like they talk — fast, imperfect, sometimes missing a letter. An ad for "Kirkland Signature" might get lost if the query says "Kirlan." The new system catches those cases early, before ads even enter the ranking pipeline.

Why this matters for us: When Instacart's ad engine works better, the ads we see at checkout are more relevant — not just more numerous — so we're less likely to get hit with a random sponsored product that doesn't match what we actually want.