85K Installs, 42% Lower CPI: Scaling a Fintech App With Retention-First Acquisition

Mobile app install campaign across social and in-app advertising channels

The challenge: volume without retention

A fintech startup preparing to scale its personal finance app was burning through acquisition budget with nothing to show for it. Previous campaigns had delivered raw install volume, but over 80% of users churned within the first week -- making unit economics unsustainable and investor confidence fragile.

Kalithea Media stepped in to redesign the entire acquisition engine from scratch. We built a multi-channel strategy across in-app display networks, Meta (Facebook and Instagram), TikTok, and native app-install formats -- all optimized on a CPI pricing model with post-install event gates. Instead of chasing the cheapest install, we engineered every campaign to attract users who would actually open the app on day seven and beyond. The result: a 2.8x LTV-to-CAC ratio within 90 days.

Mobile app analytics on smartphone
Person using mobile apps in city

How we delivered results

We combined aggressive creative testing with post-install optimization to find users who stay -- not just users who tap "Install."

Multi-channel media orchestration

We activated campaigns simultaneously across Meta, TikTok, premium in-app display networks via DV360, and native app-install placements. Each channel operated on CPI bidding with quality gates, letting us balance reach and retention across the full media mix.

Post-install event optimization

We shifted optimization targets past the install to downstream events -- account creation, first transaction, and subscription activation. Ad spend was redirected in real time toward audience segments showing genuine product engagement, not just curiosity clicks.

Creative velocity at 60+ variants per month

Our team produced and tested over 60 creative variants monthly across video, playable, static, and native formats. Top performers were scaled within 48 hours; underperformers were retired to maintain freshness and avoid ad fatigue.

MMP integration and fraud blocking

We integrated directly with the client's mobile measurement partner for deterministic attribution and deployed fraud detection layers that identified and blocked install farms, click injection, and SDK spoofing -- saving an estimated 12% of budget from fraudulent traffic.

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Why Kalithea made the difference

Retention-focused acquisition models

We built predictive models for D7 and D30 retention at the audience segment level, directing spend toward cohorts with the highest lifetime value. This is the advantage of working with an independent agency: we optimize for your business outcomes, not platform spend targets.

Platform-native creative expertise

Each channel received purpose-built creatives -- vertical video for TikTok, carousel stories for Instagram, rich media interstitials for in-app. We never repurpose a single asset across platforms; relevance drives performance in every environment.

Incrementality measurement beyond last-click

We ran geo-holdout and ghost bid experiments to prove true incremental lift, ensuring every dollar of acquisition spend generated real growth rather than cannibalizing organic installs. Full transparency on what actually moved the needle.

85K

Qualified app installs driven across all acquisition channels

-42%

Lower cost per install vs. industry benchmark on CPI model

34%

Day-7 retention rate among acquired users (vs. 18% prior)

2.8x

LTV-to-CAC ratio achieved within the first 90 days

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Need app users who actually stick around?

Our mobile acquisition team will build a retention-focused growth strategy across the channels that matter most -- optimized on CPI, CPA, or hybrid models that align with your unit economics.

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