For app growth, Meta and Google are not interchangeable line items — they are different machines. Meta is a demand-creation engine: it interrupts people who were not looking, which makes creative quality decisive. Google App Campaigns are demand-capture plus automation: they harvest intent across Search, Play, YouTube and Display with less creative control but strong install efficiency.
Start from your monetization, not the platform
- Ad-monetized apps (casual games, tools): Google App Campaigns usually win first — cheap installs at scale matter more than persona targeting.
- Subscription apps: Meta first — you need the right people, not the most people, and Meta's creative-driven targeting finds them.
- Local or service apps: Google Search + Play listing intent beats social interruption.
- Commerce apps: both, but Meta catalog ads typically open the account.
The measurement layer decides who "wins"
Whichever platform you feed better data will look better. Server-side events (Meta CAPI), correct SDK conversion signals for Google, and consent-compliant attribution are not optional plumbing — they are the scoreboard. We set the tracking before scaling the spend, so the weekly decision ("shift budget where ROAS is real") is based on measured revenue.
A worked example: ₹60,000/month for an ad-monetized app
Assume a casual app earning ad revenue of about ₹4 per retained user over its lifetime. At a blended ₹12 cost per install and 25% day-7 retention, a retained user costs ₹48 — a loss. Move either lever and the picture flips: creatives and network mix pulling CPI to ₹7, and onboarding pushing retention to 35%, brings a retained user to ₹20 while lifetime revenue climbs with session depth. This is why we optimize creative and retention before scaling budget — spend amplifies the economics you already have, good or bad.
Week-one settings that quietly decide the outcome
- Meta: Advantage+ app campaigns with 3–5 genuinely different creatives (not resizes); optimization event set to a real value event, not just installs.
- Google: App campaign budget at least 10× your target CPI daily, or the algorithm never exits learning.
- Both: exclude existing users from acquisition campaigns; separate remarketing from prospecting.
- Both: conversion windows aligned with how fast your users actually convert — subscription trials need longer windows than game installs.
Creative fatigue is measurable: when frequency creeps past ~2.5 and CTR drops 25–30% from its peak, that creative is done. Plan a refresh every 2–3 weeks — the accounts that scale are the ones that never run out of fresh angles.
A sane first-month split
Our default for a new app with a modest budget: 60/40 toward the platform your monetization model favours, three creative concepts per platform, and one variable changed per week. By week four the numbers — cost per install, day-7 retention, ROAS — tell you where the second month's budget goes. Opinions stop mattering quickly once tracking is honest.