In-app advertising is the most efficient channel for reaching mobile users in 2025. With over 4.5 billion smartphone users globally spending an average of 4.8 hours per day on mobile apps, in-app inventory offers unmatched scale, precision, and performance for advertisers.
What is In-App Advertising?
In-app advertising refers to ads displayed within mobile applications — games, utilities, social apps, news apps, and more. Unlike mobile web ads, in-app ads are rendered natively within the app environment, delivering higher viewability, better targeting, and stronger user engagement.
In-App Ad Formats
1. Banner Ads
The backbone of any in-app campaign. Standard sizes (320×50, 300×250, 728×90) displayed at the top or bottom of the screen. Best for: awareness and retargeting at scale. Typical CTR: 0.3%–1.5%.
2. Interstitial Ads
Full-screen ads displayed between content transitions (game level, article page flip). High visibility with 3–5 second forced view before a skip option. Best for: user acquisition, app installs. Typical CTR: 3%–8%.
3. Native Ads
Ads that match the look and feel of the surrounding app content. Appear as content cards, recommended content, or sponsored listings. Best for: engagement-focused campaigns. Typical CTR: 4%–12% (highest of all formats).
4. Rewarded Video
User opts into watching a 15–30 second video in exchange for an in-app reward (extra lives, coins, premium content). 100% user-initiated, highest completion rates. Best for: gaming UA, brand lift. Completion rate: 90%+.
5. Playable Ads
Interactive mini-demos of games or app features. Users "play before they install." Best for: gaming campaigns with high LTV users. Most expensive format but highest quality installs.
Bidding Models Explained
- CPI (Cost Per Install): You pay for each app install. Best for user acquisition campaigns.
- CPA (Cost Per Action): You pay when a user completes a specific action (purchase, registration, lead form). Best for performance-focused campaigns.
- CPE (Cost Per Engagement): You pay when a user completes an in-app event (tutorial, level, add-to-cart). Best for retention and re-engagement.
- CPM (Cost Per Mille): You pay per 1,000 impressions. Best for brand awareness at scale.
Targeting Capabilities
Modern in-app DSPs offer layered targeting that linear and social media can't match:
- Device targeting: OS, OS version, device model, screen size
- Geo targeting: Country, state, city, postal code, lat/long radius
- App category targeting: Only show ads in gaming apps, finance apps, etc.
- Time of day / dayparting: Run ads only during peak engagement hours
- Carrier & connection: Target WiFi-only users for video-heavy campaigns
- Audience segments: Custom lists, retargeting, lookalike audiences
How to Optimise In-App Campaigns
Week 1: Test & Learn
Run 3–4 creative variants across 2–3 ad formats. Let the algorithm gather 500–1000 events before drawing conclusions. Don't optimise too early.
Week 2: Identify Winners
Pause underperforming creatives and ad formats. Double budget on winners. Narrow targeting based on data (top-performing geos, time slots, device types).
Week 3+: Scale
Once you have a profitable CPI/CPA, scale budget 20–30% weekly while monitoring performance. Add new creatives monthly to fight ad fatigue.
Getting Started with ZinkAds
ZinkAds runs in-app campaigns on behalf of advertisers and agencies through our in-house DSP. We access 50+ global ad exchanges including InMobi, MoPub, Unity, and AppLovin. Send us your brief and we'll build a custom media plan within 24 hours.