One of the most common questions we get from new advertisers: "Should I run CPI, CPA, or CPE?" The honest answer is — it depends on your app, your goal, and where you are in your user acquisition journey. Here's a practical breakdown.
CPI — Cost Per Install
You pay for: Each app install (first open on Android, or first app launch on iOS).
Best for: Apps in early growth stage that need volume. Gaming apps, utility apps, any app that needs to build a user base quickly.
Pros:
- Simple to understand and measure
- Predictable cost structure — you know exactly what each install costs
- High volume — DSPs optimise aggressively for install events
Cons:
- Doesn't guarantee user quality — installs don't equal engagement
- Can attract "junk installs" — users who install and never open the app again
- Needs post-install event tracking to measure real value
Typical CPI benchmarks (India): Gaming $0.10–$0.30, Fintech $0.72–$1.79, E-Commerce $0.36–$0.95
CPA — Cost Per Action
You pay for: A specific in-app action — registration, purchase, subscription, loan application, etc.
Best for: Apps with an established user base and a clear conversion goal. Fintech apps, e-commerce, subscription services.
Pros:
- Pay only for users who deliver real value
- Directly tied to your business KPI
- Forces the DSP to optimise for quality, not just volume
Cons:
- Requires more data — typically needs 50+ conversion events per day to optimise
- Higher cost per event (but lower cost per real customer)
- Takes longer to optimise — 2–3 weeks before algorithm finds efficiency
Typical CPA benchmarks (India): Registration $0.60–$2.38, Purchase $2.38–$7.14, Loan Lead $1.79–$4.76
CPE — Cost Per Engagement
You pay for: A specific in-app engagement event — tutorial completion, level reached, add-to-cart, video watched, feature used.
Best for: Re-engagement campaigns for existing users, or new UA campaigns where you want to filter for quality users past the install gate.
Pros:
- Higher intent signal than CPI — users who engage are more likely to convert
- Great for retargeting lapsed users
- Can optimize for mid-funnel events before the final conversion
Cons:
- Requires deep event tracking setup (MMP integration — AppsFlyer, Adjust, etc.)
- Limited scale vs CPI — fewer users reach engagement events
Which Model Should You Choose?
- New app, need volume fast → Start with CPI. Optimize toward quality with post-install events.
- Established app, clear conversion goal → CPA. Pay only for users who matter.
- Re-engaging existing users → CPE. Target lapsed users with a specific action incentive.
- Brand awareness campaign → CPM. Focus on reach and frequency, not conversions.
Our Recommendation
Most successful campaigns start CPI to build volume and data, then transition to CPA once the algorithm has enough conversion events to optimise. Think of CPI as the door — CPA is the key to profitability.
Need help choosing the right model for your campaign? Talk to our team — we've run 1,000+ campaigns across every model and can guide you based on your specific app and goals.