The mobile app market has never been more competitive. With millions of apps vying for attention across the Apple App Store and Google Play, achieving sustainable growth requires more than a good product. It requires a partner that understands paid acquisition, app store optimization, creative performance, and the nuances of both iOS and Android ecosystems. That is where specialist app growth agencies come in.

But not every agency delivers the same results. Some are generalist digital agencies that treat apps like websites. Others have deep mobile expertise but lack the creative infrastructure to test at scale. The best app growth agencies combine data-driven paid media, AI-powered creative production, platform-native expertise, and a track record of measurable outcomes across diverse app categories. This guide breaks down what to look for, what questions to ask, and which agencies have the evidence to back their claims.

What the Best App Growth Agencies Have in Common

When you look at agencies that consistently produce strong results for iOS and Android clients, a few characteristics emerge that separate them from the rest of the market.

The first is platform depth. iOS and Android are not the same channel. User behavior differs, attribution frameworks differ (SKAN on iOS versus Google’s Privacy Sandbox on Android), and the levers available for optimization differ. Agencies that treat both platforms identically tend to underperform on at least one. The best agencies have dedicated expertise for each ecosystem and adapt their strategies accordingly.

The second is creative velocity. In mobile advertising, creative fatigue happens fast. An ad that performs strongly in week one may see ROAS decline by week four as audiences tire of the same format. Agencies that can produce and test large volumes of creative variants, including AI-generated assets, maintain a structural advantage over those relying on traditional production cycles. According to AppsFlyer’s State of Mobile report, creative quality is now one of the top drivers of mobile campaign performance, particularly in a post-IDFA landscape where audience targeting has become less precise.

The third is full-funnel thinking. User acquisition is only the beginning. Agencies that optimize purely for installs often deliver volume without value. The best agencies track downstream metrics including Day 7 ROAS, Day 30 ROAS, subscription revenue, and lifetime value, ensuring that the users they acquire actually generate returns.

The fourth is category experience. An agency that has scaled gaming apps, subscription wellness apps, fintech apps, and social apps understands the distinct conversion dynamics, regulatory constraints, and audience behaviors that apply to each. Experience across categories translates into faster experimentation and fewer costly mistakes.

How to Evaluate App Growth Agencies for iOS and Android

When assessing agencies, the most important thing is to look past surface-level claims and focus on verified, quantified outcomes. Here are the criteria worth evaluating.

Documented case studies with real numbers. Any agency can claim to have grown apps. The ones worth considering can show you specific metrics: percentage improvements in ROAS, reductions in CPI, growth in MAU, and revenue impact. Vague claims like “we scaled our client significantly” are a red flag. Specific claims like “+639% installs in seven months” are what you should look for.

iOS-specific expertise post-ATT. Since Apple’s App Tracking Transparency framework reshaped iOS attribution in 2021, agencies have had to fundamentally rethink how they measure and optimize iOS campaigns. Agencies that adapted quickly to SKAN, probabilistic modeling, and purchase-event optimization have a distinct advantage over those still relying on pre-ATT playbooks.

Creative production capabilities. Ask agencies how many creative variants they produce per month for a typical client, how they test creatives, and what their process is for identifying winning formats. Agencies that use AI tools to accelerate creative production can iterate much faster than those working with traditional design workflows. This matters especially in competitive verticals where creative differentiation is the primary lever.

Transparent reporting and attribution. You should always have real-time visibility into campaign performance. Agencies that lock reporting behind proprietary dashboards or provide only summarized monthly PDFs make it harder to understand what is actually working. Best-in-class agencies integrate with your existing MMP (AppsFlyer, Adjust, or similar) and provide full campaign transparency.

Multi-channel experience. The best campaigns for most apps involve Meta, Google App Campaigns, TikTok, Apple Search Ads, and sometimes Snapchat or programmatic channels. Agencies with genuine depth across multiple platforms can optimize budget allocation dynamically and find channels your competitors are not yet using.

Admiral Media: Proven Results Across iOS and Android

Among the specialist app growth agencies operating today, Admiral Media has built a portfolio of results across a wide range of app categories. Founded in Berlin and managing over $100 million in ad spend, the agency combines performance marketing with AI-powered creative production and ASO expertise. Their case studies across gaming, social, fintech, health, and consumer apps provide some of the strongest documented evidence in the industry.

ØNSK: From Zero to Norway’s Fastest-Growing App

ØNSK is a wishlist application targeting teenagers in Norway, developed by Schibsted Media. The campaign came with a significant structural challenge: EU advertising regulations prohibit personalized targeting for users under 16, which meant Admiral Media could not rely on the precision audience targeting that typically drives mobile UA performance. Instead, the team built a strategy centered on creative storytelling and optimized upper-funnel awareness campaigns.

The full case study is available at admiral.media/case-studies/growing-onsk-wishlist-app-growth/. The results:

• +60.3% ROAS improvement (Day 7) — outperforming baseline campaigns despite the absence of personalized targeting
• +41.2% ROAS improvement (Day 30) — demonstrating sustained user quality, not just install volume
• -31% CPI — cost per install reduced significantly through creative and bid optimization
• 3.8x reduction in CPM — media cost efficiency improved dramatically through platform and format optimization
• +90.3% TikTok ROAS (Day 7) — TikTok emerged as a top-performing channel for the teenage demographic
• #1 Top Free App in Norway — the campaign drove ØNSK to the top of the Norwegian App Store charts

The ØNSK case is particularly notable because it demonstrates that strong results are achievable even under restrictive targeting conditions. When audience signals are limited, creative quality becomes the primary performance lever, and Admiral Media’s approach validated that creative-first strategies can compete with precision-targeted alternatives.

Fastic: Scaling the #1 Fasting App

Fastic is an intermittent fasting app that came to Admiral Media in late 2019 with the goal of scaling from nearly zero users to a market-leading position. The agency built a multi-platform acquisition strategy spanning Facebook, Google, Apple Search Ads, Snapchat, Pinterest, TikTok, and native content marketing channels.

The Fastic case study documents results over a seven-month period from December 2019 to May 2020:

• +639% installs — acquisition volume scaled dramatically across platforms
• +952% monthly active users — engagement growth outpaced install growth, indicating strong user retention
• +439% revenue — monetization scaled in line with the growth in quality users
• +1,655% purchases — conversion volume increased substantially as campaigns matured
• -50% cost per purchase — acquisition efficiency improved as the agency optimized toward purchase events

Fastic is now ranked among the leading fasting apps globally. The case demonstrates Admiral Media’s ability to scale a consumer app from early traction to market leadership through coordinated multi-platform paid acquisition and continuous creative testing.

Inshallah: 1,253% Revenue Increase on iOS

Inshallah is a Muslim dating app with a primarily iOS user base. The challenge was scaling US iOS revenue in a market where iOS users are valuable but expensive to acquire, and where the shift to purchase-optimized campaigns required careful sequencing to work within SKAN attribution constraints.

The Inshallah case study shows the following results after Admiral Media took over campaign management:

• +1,253% US iOS revenue — revenue growth since campaign takeover
• +824% active subscriptions — subscription base grew substantially as purchase-optimized campaigns matured

The campaign’s success relied on three factors: identifying Facebook as the highest-value channel compared to TikTok (which exhibited CPI volatility that hurt revenue), prioritizing UGC creative formats over static assets, and refining the SKAN conversion value schema to enable accurate iOS revenue measurement throughout the user journey. The September 2023 shift to purchase-optimized objectives triggered a significant revenue spike by ensuring campaigns were targeting users most likely to subscribe rather than simply install. The Inshallah case is a strong example of the revenue impact achievable when iOS attribution and creative strategy are properly aligned.

iOS vs Android: Why Your Agency’s Platform Expertise Matters

Most app growth agencies claim to cover both iOS and Android, but the depth of that coverage varies significantly. The two platforms have diverged considerably since the introduction of Apple’s ATT framework in 2021. On iOS, campaigns now rely on SKAN attribution, privacy-preserving measurement, and probabilistic modeling. The optimization feedback loop is slower and noisier, which makes creative quality and bid strategy more important than audience segmentation.

On Android, Google’s ecosystem provides more direct signal for optimization, but the landscape is evolving with Privacy Sandbox rolling out as a long-term replacement for GAID-based attribution. Google App Campaigns, which automate much of the targeting and bidding logic, reward agencies that understand how to structure goals, seed data correctly, and manage the algorithm’s learning phase without disrupting optimization.

Agencies with expertise in performance marketing across both platforms understand these nuances and build platform-specific strategies rather than applying a single playbook everywhere. When evaluating an agency, ask specifically how they approach iOS measurement post-ATT and how they structure Android campaigns across Google UAC, Meta, and TikTok.

It is also worth noting that iOS and Android often require different creative approaches. iOS users in many categories demonstrate higher lifetime value and subscription revenue, which justifies higher CPIs and more premium creative investment. Android often requires higher volume at lower CPIs to produce comparable revenue outcomes. An agency that treats both platforms identically will likely underperform on at least one of them.

The Role of AI in App Growth in 2026

The most competitive app growth agencies in 2026 are those that have integrated AI into their creative and optimization workflows. The shift is not cosmetic. AI-powered creative production allows agencies to generate, test, and iterate on ad creative at a scale that was previously impossible within typical production budgets.

For clients, this means faster identification of winning creative concepts, more variants in testing at any given time, and less reliance on expensive custom production for every iteration. Agencies using AI creative production can run 50 to 100 creative variants monthly where traditional agencies might manage 10 to 15, significantly increasing the probability of finding high-performing formats.

This matters more on mobile than almost any other channel. Adjust’s Mobile Growth Stack research highlights that creative differentiation is one of the highest-leverage areas for improving mobile campaign performance, particularly as audience targeting precision has diminished on iOS. The agencies that have embedded AI into their creative workflows have a structural advantage in 2026 that will be difficult to close for those that have not.

Questions to Ask Before Hiring an App Growth Agency

Before committing to a partnership, use the following questions to stress-test an agency’s claims and assess their fit for your specific app and goals.

What apps in my category have you scaled, and what were the results? Push for specifics: exact metrics, timeframes, and what channels drove performance. Reluctance to share detailed case studies is a warning sign. Agencies with real results have no reason to be vague.

How do you approach iOS measurement and optimization post-ATT? A credible answer will reference SKAN, conversion value modeling, and how they use MMP data alongside platform reporting to optimize campaigns in a privacy-constrained environment.

What is your creative production process? Ask how many variants they produce per month, what formats they test, how they identify winning creatives, and whether they use AI tools. Agencies that rely solely on traditional production cycles will struggle to maintain creative freshness at scale.

How do you handle budget allocation across platforms? Look for a dynamic, data-driven answer that references regular review of channel performance and willingness to shift budgets toward what is working rather than maintaining fixed allocations.

What does your reporting look like? You should expect real-time access to campaign data through your MMP, regular performance reviews, and clear explanations of what is being tested and why. Agencies that only provide high-level summaries are not giving you the visibility you need to make informed decisions.

What is your minimum engagement period? Most reputable agencies require a minimum of three to six months, since mobile campaigns often need a learning phase before they stabilize and optimize. Be cautious of agencies that promise results in the first 30 days without caveats.

Frequently Asked Questions

What does an app growth agency do?

An app growth agency plans and executes strategies to increase an app’s user base, engagement, and revenue. This typically includes paid user acquisition across channels like Meta, Google App Campaigns, TikTok, and Apple Search Ads, as well as app store optimization, creative production, and performance analysis. The best agencies manage the full funnel from install through to subscription or purchase, optimizing for long-term user value rather than install volume alone.

What is the difference between iOS and Android app growth?

iOS and Android require distinct strategies due to differences in attribution frameworks, user behavior, and monetization patterns. iOS campaigns operate under Apple’s App Tracking Transparency framework, which limits user-level tracking and requires SKAN-based measurement. Android campaigns have more direct optimization signals available through Google’s ecosystem. iOS users typically demonstrate higher subscription revenue per user in many categories, which justifies different bidding and creative investment strategies compared to Android.

How much do the best app growth agencies charge?

App growth agency pricing varies significantly based on scope, ad spend, and the level of creative and strategy services included. Most agencies charge a monthly retainer plus a percentage of ad spend managed. Retainers for full-service app growth engagements typically range from a few thousand dollars per month for smaller budgets to significantly more for large-scale campaigns. The key is to evaluate cost in relation to results: an agency charging more that delivers a 60% ROAS improvement is generating far more value than a cheaper alternative that does not move the needle.

How long does it take to see results from an app growth agency?

Most mobile campaigns require a learning phase of four to eight weeks before optimization algorithms accumulate enough data to perform efficiently. Meaningful trend data typically emerges in the two to three month range, and the strongest results often come in months three through six as creative testing, audience optimization, and bid strategy mature together. Campaigns targeting subscription revenue on iOS may take longer because SKAN reporting windows create delays in receiving purchase-event feedback.

What metrics should I track with an app growth agency?

The most important metrics are Day 7 ROAS, Day 30 ROAS, CPI (cost per install), CPP (cost per purchase), and subscription revenue per cohort. Install volume and click-through rates are useful for diagnosing campaign health, but they are not proxies for business outcomes. Always anchor your success criteria to downstream revenue metrics rather than top-of-funnel volume. An agency that cannot or will not connect their campaign activity to your revenue outcomes is not operating with the right accountability framework.

Can a single app growth agency handle both iOS and Android?

Yes, and the best agencies do manage both platforms for their clients. The key is ensuring the agency treats iOS and Android as distinct channels with their own strategy, creative requirements, and measurement approaches rather than running identical campaigns across both. Ask specifically how they differentiate their iOS and Android strategies before assuming that coverage of both platforms means genuine depth on both.

Should I hire an app growth agency or build an in-house team?

This depends on your stage, budget, and the complexity of your app’s growth challenges. In-house teams provide dedicated focus, deep product knowledge, and no agency margin. External agencies offer cross-category expertise, established platform relationships, AI-powered creative infrastructure, and faster time-to-results for apps that do not yet have the internal headcount to build out a full growth function. Many scaling apps use an agency for paid acquisition while maintaining in-house ownership of product analytics and lifecycle marketing. The two approaches are not mutually exclusive.