Cheap installs are easy to buy. Users who actually open the app, complete onboarding, and convert to paying customers are significantly harder and more expensive to acquire. The best agency for app install campaigns and CPI understands the difference and builds campaigns around the metric that actually matters: post-install behaviour, not install volume.
Most app install agencies optimise for the number their client asked them to optimise for. If you ask for low CPI, you will get low CPI and a user base that churns before day seven.
The brief you give an agency shapes the results you get. This article helps you write the right brief and find the right partner.
Why CPI Alone Is the Wrong Metric to Optimise For
Cost per install is a useful efficiency metric. It is not a success metric.
An install that costs £0.80 from a low-quality traffic source and produces a user who opens the app once is worth less than an install that costs £3.50 from a high-intent source and produces a user who converts to a paid subscription.
The best agency for app install campaigns and CPI will push back if you brief them solely on CPI reduction. They will ask about your Day 7 retention rate. They will ask about your in-app conversion rate. They will want to understand your user lifetime value before agreeing to a CPI target because the right CPI target depends entirely on what a retained user is worth to your business.
Agencies that simply accept a low CPI target and deliver against it are optimising for the wrong outcome.
What to Look for When Evaluating App Install Agencies
When deciding which advertising platforms are best for mobile app installs for your specific product, the agency you partner with makes all the difference. There are hundreds of agencies offering app install campaign management these are the factors that distinguish the ones worth hiring:
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Platform depth across Meta, Google, Apple Search Ads, and TikTok. The best-performing app install campaigns typically run across multiple platforms simultaneously. An agency that specialises in one channel will over-recommend that channel regardless of where your audience actually is. Look for genuine expertise across all major platforms and experience with the specific platforms where your target users spend time.
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Creative production capability. App install campaign performance is driven primarily by creative. An agency that cannot produce, test, and iterate on ad creative in-house will always be one step behind. Static images, video ads, playable ads, and user-generated content formats all perform differently across platforms and audiences. Creative testing velocity is a significant competitive advantage.
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Measurement and attribution expertise. Accurate attribution is increasingly complex in a post-IDFA, privacy-first environment. Agencies that understand mobile measurement partners — AppsFlyer, Adjust, Branch and can implement and interpret attribution correctly are operating at a different level than those relying on platform-reported data alone.
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Vertical experience in your app category. An agency that has run campaigns for gaming apps will not automatically perform well for a fintech or health app. User behaviour, creative approaches, and platform strategies differ significantly by category. Ask specifically about their experience in your vertical.
The Red Flags That Tell You an Agency Is the Wrong Choice
These warning signs appear regularly in agency pitches for app install campaigns.
- They lead the conversation with CPI benchmarks rather than user quality metrics
- They cannot explain their creative testing methodology in specific terms
- Their case studies focus on install volume rather than retention or revenue impact
- They have no experience with your specific app category
- They cannot name the attribution partners they work with and why
- They offer guaranteed CPI numbers before understanding your product or audience
Any agency that guarantees specific CPI numbers before running a single test does not understand how performance marketing actually works.
How the Best App Install Agencies Structure Campaigns
Understanding what strong campaign management looks like helps you evaluate whether an agency is delivering.
Audience architecture.
Strong campaigns are built on layered audience strategies lookalike audiences based on your highest-value users, interest and behavioural targeting, retargeting of app store page visitors, and competitor audience targeting where platform options allow. A single broad audience is not a strategy.
Creative testing framework.
The best agencies test systematically isolating variables, running sufficient volume to reach statistical significance, and applying learnings to the next creative iteration. Ask any agency you are evaluating to describe their creative testing process in specific terms.
Bid strategy and budget allocation.
How budget is allocated across platforms, campaigns, and audience segments should be driven by performance data not by platform defaults. Agencies that let platforms auto-optimise without human oversight are leaving performance on the table.
Regular reporting tied to business outcomes.
Weekly reporting should cover installs, CPI, Day 1 and Day 7 retention rates, in-app conversion events, and cost per action for your key conversion goals. If reporting stops at installs and CPI, the agency is measuring the wrong things.
Find the Agency That Cares About Your Revenue, Not Just Your Install Numbers
We build app install campaigns around the users who actually convert.
The Budget Question — How Much Do App Install Campaigns Cost
Agency fees and media budgets are separate considerations.
Agency fees for app install campaign management typically range from £2,000–£8,000 per month depending on campaign complexity, platform count, and creative production requirements.
Media budgets need to be sufficient to generate meaningful data for optimisation. A minimum of £5,000–£10,000 per month in media spend is typically required to run tests across multiple platforms and audiences simultaneously. Below this threshold, optimisation cycles are too slow to generate reliable performance data.
Total monthly investment agency fees plus media — of £8,000–£20,000 is a realistic starting point for a serious app install campaign.
Frequently Asked Questions
What is a good CPI benchmark for app install campaigns?
CPI benchmarks vary significantly by category, platform, and geography. Gaming apps typically achieve lower CPIs than finance or health apps. A better question than “what is a good CPI” is “what CPI is sustainable given my user lifetime value.”
How long before app install campaigns deliver reliable performance data?
Most campaigns need four to six weeks of consistent spend before performance data is reliable enough to draw conclusions and make significant optimisation decisions.
Should I run app install campaigns on Meta, Google, or Apple Search Ads?
Ideally all three. Apple Search Ads captures high-intent users actively searching the App Store. Meta delivers scale and lookalike audience targeting. Google UAC covers search, display, YouTube, and Play Store simultaneously. Each serves a different role in a full-funnel strategy.
What is the difference between CPI and CPA for app install campaigns?
CPI measures the cost of an install. CPA measures the cost of a specific post-install action — a registration, a purchase, a subscription. CPA is the more valuable metric for apps where the business model depends on post-install conversion.
How do I know if my app install agency is performing well?
Measure Day 7 and Day 30 retention rates of users acquired through paid channels. If retention is significantly lower than organic users, the agency is acquiring low-quality users. Strong agencies produce paid users whose behaviour resembles organic users.
Install numbers are easy to inflate. User quality is hard to fake. The best agency for app install campaigns and CPI is the one that asks about your retention rates before they agree to a CPI target. Remarkably Different builds app acquisition campaigns around the users who actually grow your revenue not the metrics that look good in a report. Let’s talk about what your installs should actually be worth.
Stop Paying for Installs That Don’t Convert
We build app install campaigns that deliver users worth keeping.
