What Is Customer Acquisition Cost?
Customer Acquisition Cost (CAC) is the total cost of acquiring one new user. It includes advertising spend, creative production, attribution tools, team salaries, and any other costs related to acquiring users.
CAC = Total Acquisition Costs / Number of New Users Acquired
In mobile apps, you will also encounter CPI (Cost Per Install), which measures ad spend per install. CAC is broader because it includes all costs, not just media spend.
Why CAC Matters
CAC is one half of the most important equation in mobile business:
LTV > CAC
If lifetime value exceeds acquisition cost, your business can scale. If not, every new user loses money.
CPI Benchmarks by Platform and Region (2026)
| Region | iOS CPI | Android CPI |
|---|---|---|
| United States | $3.50-6.00 | $1.50-3.50 |
| Western Europe | $2.50-5.00 | $1.00-3.00 |
| Japan/South Korea | $3.00-5.50 | $1.50-3.50 |
| Latin America | $0.80-2.00 | $0.30-1.00 |
| Southeast Asia | $0.50-1.50 | $0.20-0.80 |
iOS CPI is consistently higher due to stronger privacy restrictions (ATT) that make targeting less efficient.
CPI by Ad Channel
| Channel | Typical CPI Range | Best For |
|---|---|---|
| Apple Search Ads | $2.00-5.00 | High-intent users |
| Google App Campaigns | $1.00-4.00 | Scale with automation |
| Meta (Facebook/Instagram) | $1.50-5.00 | Broad reach |
| TikTok Ads | $1.00-3.50 | Younger demographics |
| Organic (ASO) | $0 media cost | Highest quality users |
Blended CAC vs Paid CAC
Paid CAC = Paid acquisition costs / Paid installs only
Blended CAC = All acquisition costs / All installs (paid + organic)
If you spend $50,000 on ads for 10,000 paid installs (paid CAC = $5) but also get 40,000 organic installs, blended CAC across all 50,000 users is $1. Investors look at blended CAC. Media buyers focus on paid CAC.
The LTV/CAC Ratio in Practice
| LTV/CAC Ratio | Interpretation |
|---|---|
| Below 1.0 | Losing money. Pause paid acquisition |
| 1.0 to 1.5 | Breakeven territory |
| 2.0 to 3.0 | Healthy for growth-stage apps |
| 3.0+ | Strong economics, scale aggressively |
| 5.0+ | Possibly under-investing in growth |
CAC Payback Period
Payback Period = CAC / Monthly ARPU
| Payback Period | Assessment |
|---|---|
| Under 3 months | Excellent |
| 3-6 months | Good for most categories |
| 6-12 months | Acceptable for high-LTV subs |
| Over 12 months | Risky without strong data |
Reducing CAC
Invest in Organic Channels
Every improvement to ASO, word-of-mouth, and content marketing reduces blended CAC.
Improve Conversion Rates
Improving store conversion from 25% to 35% effectively reduces CPI by 28%.
Optimize Creative
Ad creative has the single biggest impact on paid CPI. Test multiple formats, rotate frequently, and double down on winners.
Target High-LTV Segments
If users from a specific segment have 3x higher LTV, paying 2x higher CPI for them is still a better deal.
Leverage Referrals
If 20% of new users come from referrals, your blended CAC drops by 20%.
Common CAC Mistakes
Ignoring organic in blended CAC. If organic drives 80% of installs, your true marginal paid CAC is much higher.
Forgetting non-media costs. Agency fees, creative production, and tool subscriptions are real costs.
Comparing CPI across different objectives. Install-optimized campaigns have lower CPI but potentially worse retention than event-optimized ones.