Spend
Spend is the money that actually left your Apple Ads budget. It is the numerator of almost every cost metric, and the number your revenue has to beat for a campaign to pay back.
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On Apple Ads search results campaigns you pay per tap, so spend grows one tap at a time. An impression that nobody taps costs nothing, and a download does not add a separate charge. Spend is simply the sum of what every tap cost in the reporting period, for whatever level you are looking at: account, campaign, ad group or keyword.
How spend adds up
Each tap is priced by the auction. The price you pay is usually below your maximum cost-per-tap bid, and it depends on competition and on how relevant your app is to the search, not on your bid alone. Adding those individual prices together gives spend.
Because spend equals taps times average CPT, any change in spend has two possible causes: you bought more taps, or each tap got more expensive. Splitting the change into those two parts is the quickest way to see whether a jump in spend is growth or inflation.
Budgets: how spend is capped
Apple Ads gives you two controls on how much you can spend. They work at different levels and solve different problems.
- Daily budget. The average amount you are willing to spend on a campaign per day. It paces delivery so a campaign does not burn through its money early in the month. Actual spend on a given day can land somewhat above or below it.
- Lifetime budget. An optional total for the whole campaign. Once spend reaches it, the campaign stops serving. It is useful for a fixed test or a seasonal push with a hard ceiling.
- Bids. Your maximum CPT bids do not cap spend directly, but they decide how many auctions you win and what you pay in them, which is where most of the movement in spend comes from.
A campaign that consistently spends its full daily budget is budget-limited: it could buy more taps at current bids if you let it. A campaign that spends well under its budget is bid- or demand-limited, and raising the budget alone will not change much.
Reading spend by keyword
Account-level spend tells you what you paid. Keyword-level spend tells you where the money went, and it is usually concentrated: a small number of keywords tend to take most of the budget. Those are the lines worth checking first.
- Sort keywords by spend, highest first.
- Next to spend, look at downloads and CPA to see what the traffic cost per download.
- Then add trials, subscriptions and revenue for the same keyword, so each dollar of spend is judged by what it brought back.
- Compare revenue with spend over the same cohort window. Spend is counted when the tap happens; subscription revenue arrives over weeks or months.
Spend and subscription economics
For a subscription app, spend is the cost side of payback. Divide it by downloads and you get CPA; divide it by trials or subscriptions and you get the cost of the outcomes that matter; set revenue against it and you get ROAS. None of those ratios is meaningful unless spend and conversions are attributed to the same campaign, ad group or keyword over the same period.
Related metrics: taps and CPT explain where spend comes from; CPA, cost per trial and ROAS explain whether it was worth it.