CPI (Cost Per Install)

What is CPI?

Cost Per Install (CPI) is the average cost paid by an advertiser to acquire one attributed app install. It is the most commonly cited efficiency metric for mobile user acquisition because it directly maps spend to a tangible outcome — a new user in the app.

Formula

CPI = Total Ad Spend ÷ Attributed Installs

In Apple Search Ads specifically, you do not pay per install; you pay per tap (CPT). CPI is therefore a derived metric:

CPI = CPT × (Taps ÷ Installs)
    = CPT ÷ Conversion Rate (tap → install)

A 2 USD CPT with a 40% conversion rate produces a CPI of 5 USD. The same CPT with a 20% conversion rate produces a CPI of 10 USD. This is why tap-to-install conversion rate is just as important as bid management.

Typical CPI ranges by category (US, 2026)

Category	Typical CPI range	Notes
Utilities	$1.50 – $3.00	Low ARPU, high volume
Productivity	$2.00 – $5.00	Wide variance by sub-vertical
Social Networking	$2.00 – $5.00	Network-effect apps tolerate higher CPI
Mobile Games	$2.00 – $6.00	Hyper-casual lower, RPG/strategy higher
Health & Fitness	$3.00 – $7.00	Subscription LTV justifies premium
Photo & Video	$2.50 – $6.00	Creator-tools subset higher
Finance	$5.00 – $12.00	Strong intent + high LTV
Travel	$4.00 – $9.00	Seasonal swings

Outside the US, CPIs typically run 40-70% of US benchmarks, with Tier-1 markets (UK, AU, JP, DE) closer to US levels and emerging markets significantly lower.

What’s a “good” CPI?

There is no universal answer — a good CPI is one your LTV (lifetime value) exceeds with margin. The common rule of thumb is:

• LTV ≥ 3× CPI for sustainable growth
• LTV ≥ 2× CPI is breakeven plus operating cost
• LTV ≤ CPI is a leak — pause and re-evaluate before scaling

LTV is itself a function of monetization model (ad revenue, subscription, in-app purchases), retention curves, and ARPU. ASA practitioners typically use 30-day or 90-day LTV depending on revenue cadence.

How to lower CPI in Apple Search Ads

The biggest CPI gains usually come from conversion-rate improvements, not bid cuts:

1. Block zero-conversion search terms. Use the Search Term Report to find search terms that received taps but zero installs over the last 30 days. Add them as negative keywords in the matching ad group.
2. Tighten Search Match exposure. Search Match casts a wide net — but on low-relevance keywords it produces taps that don’t convert. Move the keyword to Exact match and bid directly.
3. Improve the product page tap-to-install rate. Even a 5-point lift in CR (from 35% to 40%) lowers CPI by 12-15%. A/B test screenshots, the first line of the description, and the app icon. Use Custom Product Pages for high-volume keywords.
4. Lower bids on terms with CPT >> category average and CR < 30%. Often paying too much for terms with weak relevance.
5. Reallocate budget toward Brand and Category campaigns. Brand keywords convert at 60-90% — almost free CPI. Category keywords typically convert at 35-55%.

How ASAPilot helps

ASAPilot’s Budget Guard monitors CPI minute-to-minute and flags anomalies before they drain budget:

• Daily baseline CPI per app, per campaign, per ad group
• Sigma-based anomaly detection (CPI more than 2σ above baseline triggers an alert)
• Zero-conversion keyword detection (taps without installs over a configurable window)
• Burning-campaign detection (campaigns with sudden spend acceleration but no install lift)

Connect your Apple Search Ads account in under 2 minutes — see the audit guide for what gets surfaced, or pricing for plan tiers.

Related terms

• Apple Search Ads — the platform
• CPT (Cost Per Tap) — what Apple Search Ads actually bills
• SKAdNetwork — privacy-preserving attribution standard