Hire a specialist user acquisition agency when your funnel already converts and the problem is buying more of the right users at a cost that pays back. Hire a full-service app marketing agency when several stages are weak at once, such as store page, onboarding, paywall and paid traffic, and nobody on your team can coordinate separate suppliers. If one stage is clearly worse than the rest, hire the specialist for that stage, which may not be an acquisition agency at all. The mistake to avoid is choosing the supplier before you know where the funnel leaks, because paid traffic amplifies whatever is already true about it.
Most writing on this question is a vendor list, and we have published our own comparisons of app marketing agencies and user acquisition agencies by name. This guide comes a step earlier. It sets out what each type of partner owns, gives a numbers-first way to find your bottleneck using published subscription benchmarks, and covers the hand-offs between specialists where most of the money is lost.
Key takeaways
- "App marketing agency" is a label for at least five different jobs. Ask which ones a supplier staffs and has results in.
- Subscribers are installs multiplied by each conversion rate, so a 20% gain at any stage is worth 20% more subscribers. Fix the stage with the most headroom, not the one your current supplier happens to sell.
- A specialist UA agency is the right hire when conversion is healthy and volume at target CAC is the constraint.
- Full-service earns its premium when several stages are weak and you have no in-house lead to coordinate suppliers.
- With several specialists, the risk moves to the seams. Give every hand-off a named owner.
What separates a user acquisition agency from an app marketing agency
A user acquisition agency, or UA agency, runs the paid campaigns that bring new users into the app. Its core work is channel operation: campaign structure, bidding, budgets, the optimisation event, and reporting. Some run one channel deeply, some run several. An app marketing agency is a wider label. It can include paid acquisition, but also app store optimisation, creative production and retention or lifecycle work, sold together as a full-service package.
In practice the labels overlap. Plenty of UA agencies call themselves app marketing agencies, and plenty of full-service agencies are, underneath, a media team with one ASO consultant. Our guide to what a mobile app marketing agency should do describes the four disciplines inside the label and what good looks like in each. The decision here is narrower: whether to buy one discipline done deeply or several done together.
Five kinds of partner, five different jobs
The brief behind this question usually names two options. There are five, and the three in the middle are often the right answer.
| Partner type | What it owns | What it usually leaves out | Right when |
|---|---|---|---|
| Specialist UA agency | Paid campaigns on one or several channels: structure, bidding, budgets, optimisation events, reporting. | Store page, onboarding, paywall and retention. Creative often thin or bought in. | The funnel converts and the constraint is profitable volume. |
| Full-service app marketing agency | Several disciplines under one contract, typically paid acquisition plus some mix of ASO, creative and retention. | Depth varies by discipline. Some services may be subcontracted or staffed by one person. | Several stages are weak at once and nobody in house can coordinate separate suppliers. |
| Performance creative specialist | Concepts, scripts, UGC, video and static ads at the rate an account consumes them, sometimes with media buying attached. | Usually no ASO or lifecycle. Media-only creative shops may not see cohort results. | Media is set up sensibly but ads fatigue faster than you can replace them. |
| ASO specialist | Store keywords and metadata, product page tests, screenshots, icons, custom product pages. | Does not buy paid traffic or make paid ads. | Paid works but organic installs are flat, or store page conversion lags. |
| Lifecycle or monetisation partner | Onboarding, paywall and pricing tests, push, email and in-app messaging, churn work. | Does not acquire users. | Trials start but do not convert, or subscribers churn early. |
The table describes typical scope, not any named company. Scope varies within each type, which is why the questions later in this guide matter more than the label a supplier uses.
Find the bottleneck before you pick the partner
For a subscription app, the number of new subscribers from paid acquisition is a simple product:
Installs = spend ÷ cost per install
Because the stages multiply, a 20% improvement anywhere produces 20% more subscribers. Cutting cost per install by a fifth, lifting install-to-trial by a fifth and lifting trial-to-paid by a fifth are worth broadly the same. So the question is not which stage matters most. It is which stage has the most room to improve, and which partner can move it. That is a question you can partly answer with published benchmarks.
Benchmarks to compare each stage against
The figures below are Health & Fitness medians from RevenueCat's State of Subscription Apps 2026, which covers more than 115,000 apps. Each stage has its own denominator and window, so read each row on its own.
| Stage | Definition | H&F median | Upper end |
|---|---|---|---|
| Download-to-trial | Share of installs starting a free trial within 30 days of download (trial-based apps only) | 6.9% | Top performers above 23% |
| Trial-to-paid | Share of free trial starts that convert to a paid subscription | 37.7% | Top quartile above 51.4% |
| Download-to-paid | Share of installs with at least one paid subscription within 35 days of install | 2.9% | Top quartile above 6.2% |
Two cautions. These are medians across apps, each from its own distribution, so multiplying 6.9% by 37.7% does not reproduce the 2.9% download-to-paid figure and should not be used as a combined benchmark. And the report does not split these rates by paid versus organic installs, so paid cohorts may sit below them. Use them to spot a stage that is far off, not to grade a stage that is a point or two away. Our benchmark pages for install-to-trial, trial-to-paid and download-to-paid cover the other categories, regions and trial lengths.
A worked example: the same budget, two different fixes
Take a hypothetical fitness app spending £10,000 a month at £2.50 per install. That buys 4,000 installs. Its install-to-trial rate is 7%, close to the category median, so 280 people start a trial. Its trial-to-paid rate is 24%, well below the 37.7% median, so about 67 become subscribers. Cost per subscriber is about £149.
| Scenario (£10,000 spend) | Installs | Trials | Subscribers | Cost per subscriber |
|---|---|---|---|---|
| Starting point | 4,000 | 280 | 67 | about £149 |
| Cut CPI 20% (media or creative fix) | 5,000 | 350 | 84 | about £119 |
| Lift trial-to-paid from 24% to 36% (paywall, trial or product fix) | 4,000 | 280 | 101 | about £99 |
A 20% cheaper install is a good result for a UA agency, and it takes cost per subscriber from about £149 to about £119. Bringing trial-to-paid from 24% to 36%, which is still just under the median, takes it to about £99. The second fix is worth more here because the gap to benchmark is larger. It is also a fix no media buyer can make, because it lives in the paywall, the trial offer and the product. This app's first hire is a monetisation or lifecycle partner, or a full-service agency that genuinely does paywall work. A UA specialist would make it more efficient at buying trials that do not convert.
Flip the numbers and the answer flips. If the same app converted 40% of trials but only 3% of installs started one, it would make 48 subscribers at about £208 each, and the gap would sit at the top of the funnel. Then the next check is whether every ad converts poorly, which points to onboarding, or whether some concepts convert well and others badly, which points to creative and to the match between what the ad promises and what the app shows first. The third case is the one where a UA specialist is clearly right: both rates near or above benchmark, and cost per subscriber still above your target CAC.
Which symptom points to which partner
The worked example generalises into a short diagnostic. The third column is the useful one: the hire that would make the problem worse while reporting progress.
| What you see | Number to check | Who to hire | Who makes it worse |
|---|---|---|---|
| Download-to-trial near or above benchmark, trial-to-paid well below | Trial-to-paid by trial length and category | Lifecycle or monetisation partner, or a full-service agency with real paywall work | A UA specialist, who will buy more trials that do not convert |
| Download-to-trial well below benchmark, trial-to-paid healthy | Install-to-trial split by campaign and by ad concept | If one ad converts and another does not, creative. If all ads convert poorly, onboarding | A media buyer optimising for cheaper installs |
| Both conversion rates healthy, CAC still above target | CPI and cost per trial against target CAC | Specialist UA agency or performance creative specialist | A lifecycle partner fixing a funnel that already works |
| Paid works but costs climb with every budget step | Marginal CAC per step, frequency, reach in each market | Creative capacity first; new channels or markets second | Anyone whose only lever is the budget |
| Organic installs flat or store page converts poorly | Store page conversion rate, search impressions | ASO specialist | More paid spend landing on the same page |
| Ad platform, MMP and subscription data disagree badly | Subscribers by cohort in each source | Fix measurement first, with whoever owns your data | Any agency asked to improve a number nobody trusts |
The fourth row deserves a note. Rising costs at each budget step can be creative fatigue, market saturation or falling cohort quality, and each has a different owner. Our guide to scaling Meta Ads for a subscription app sets out how to tell them apart before you decide who to hire.
When a specialist UA agency is the better hire
A specialist wins when the funnel behind the ad already works and paid acquisition is the constraint. In that position you want the most depth on the channel that carries your spend, and a specialist sees that channel across many accounts at once. The same applies when one channel dominates your mix. If most of your budget sits on one platform, breadth across five networks is paying for skills you are not using.
A specialist also suits a team that already has the other disciplines covered. If you have an in-house product team running paywall tests, or a growth lead who owns the store page, a full-service agency would duplicate them. And it suits a team that wants to keep the option of changing one supplier without unpicking everything. Replacing a specialist is a contained project; replacing a full-service agency means rebuilding several functions at once, as we cover in our guide to switching app marketing agencies.
When a full-service app marketing agency is the better hire
Full-service earns its place when several stages are weak at once. A pre-scale app with an untested store page, a first-draft onboarding and no paid history does not have one bottleneck to hand to a specialist, and three suppliers would each optimise their own stage against the others. One team that can see the whole funnel, and decide the order of fixes, is worth more than depth on any single stage.
It also wins when nobody on your side can coordinate. Running several specialists well needs a person who owns the funnel, reads the cohort data and settles disputes between suppliers. If that person does not exist and you are not ready to hire one, a single accountable agency is the safer structure. Our comparison of an in-house UA manager against an agency covers the other way to fill that coordinating role.
The risk with full-service is uneven depth. One contract can hide a strong media team and a weak creative or ASO function, and the report on the weak function is written by the same company that delivers it. That is not a reason to avoid full-service. It is a reason to test each discipline separately before signing.
Five questions that show what a full-service agency actually staffs
- Who does each discipline, and are they employees? Ask for names or roles for media, creative, ASO and lifecycle, and which, if any, are subcontracted.
- Can you show a result in each discipline you are selling us? A case study for paid acquisition does not prove the paywall work.
- What is the price if we only take two of the services? An unbundled quote shows what you are paying for scope you may not use. Our guide to UA agency pricing covers the fee models you will be quoted.
- Which stage of our funnel would you fix first, and why? A good answer cites your numbers. A weak one names the service with the largest fee.
- How is each discipline reported? Look for cohort subscribers and revenue, not activity counts such as tests run or keywords added.
The seams: where work falls between specialists
Choosing several specialists does not remove the coordination problem. It moves it to the hand-offs. These are the four seams we see cause the most trouble in subscription apps, and none of them belongs naturally to any one supplier.
| Seam | Falls between | What goes wrong |
|---|---|---|
| Ad promise vs paywall | Creative or UA agency and lifecycle partner | The ad sells one benefit and the paywall sells another, so cheap traffic converts poorly and each side blames the other. |
| Ad vs store page | UA agency and ASO specialist | Paid traffic lands on a page tested for organic searchers. Custom product pages need someone to own them. |
| Platform numbers vs revenue | UA agency and your product or data team | The agency reports platform ROAS while finance sees different cohort revenue. Nobody reconciles. |
| Fatigue vs saturation | Media buyer and creative supplier | Rising costs get blamed on the ads or on the audience depending on who is in the room. |
The fix is unglamorous: write down an owner for each seam before the work starts, and make one person on your side accountable for the whole funnel. A specialist set-up with owned seams usually beats a full-service agency. A specialist set-up without them usually loses to one, because full-service at least puts every seam inside one company.
Spend level changes the balance too. Our app marketing agency comparison gives a rough spend line below which consolidating suppliers usually makes more sense, because coordination overhead outweighs specialist depth. Whatever you choose, the agency audit scorecard works on each supplier separately.
Where we fit
We are a specialist, and we say so on our Meta Ads service page: we would rather be exceptional on one channel than mediocre on five. We run Meta campaigns for mobile apps and make the performance creative that feeds them, which puts us in the specialist UA and performance creative rows of the table above, not the full-service one. We do not run app store optimisation or lifecycle programmes. If your numbers point to the paywall or the store page, you should hire for that first, and we will tell you so on a first call.
Where the funnel converts and Meta plus creative supply is the constraint, that combination is our whole job. Our Steps & Beasts case study shows a published 1112% revenue increase and 118% more active subscriptions, credited to heavy creative testing alongside onboarding changes. You can see how we work with consumer and subscription apps, check our pricing, which includes creative, Meta management and reporting in one fee, and if that is your bottleneck, apply to work with us. For how acquisition fits the rest of the funnel, start with our subscription app marketing strategy guide.
Frequently asked questions
What is the difference between a user acquisition agency and an app marketing agency?
A user acquisition agency runs paid campaigns that bring new users into an app, usually across channels such as Meta, Google, TikTok, Apple Ads and ad networks. An app marketing agency is a broader label that can also cover app store optimisation, creative production and retention or lifecycle work. Many companies use both labels, so the useful question is which disciplines a supplier staffs in house and has results in, not what it calls itself.
Is a full-service app marketing agency better than a specialist?
Neither is better in general. A full-service agency suits an app with several weak points at once and no in-house growth lead to coordinate separate suppliers. A specialist suits an app with one clear bottleneck, because it brings more depth on that one problem and you do not pay for disciplines you will not use. Find the weakest stage of your funnel first, then hire for it.
How do I know which part of my app funnel is the bottleneck?
Compare each stage with a benchmark for your category and check which has the largest gap. For subscription apps, RevenueCat's State of Subscription Apps 2026 publishes medians for download-to-trial within 30 days, trial-to-paid as a share of trial starts, and download-to-paid within 35 days. Because subscribers equal installs multiplied by each conversion rate, a given percentage gain at any stage adds the same percentage of subscribers, so the stage with the most headroom below benchmark is usually the one to fix first.
Can I combine a specialist UA agency with other specialists?
Yes, and many apps above a modest spend do exactly that, for example a paid social specialist alongside an app store optimisation specialist or a lifecycle partner. It works when one person on your side owns the funnel and every hand-off between suppliers has a named owner, such as who keeps the ad promise and the paywall consistent. It fails when two suppliers share one function and each can credit or blame the other.
Does The Social Outline offer app store optimisation or lifecycle marketing?
No. The Social Outline is a specialist in Meta Ads management and performance creative for mobile apps. It does not run app store optimisation or lifecycle and CRM programmes, so an app whose main gap is store visibility or retention should hire a partner for that work.
The short version
Put your funnel next to a benchmark before you put suppliers next to each other. If conversion is healthy and volume at target CAC is the problem, hire a specialist for the channel and the creative. If one later stage is far below benchmark, hire for that stage, even though it is not acquisition. If several stages are weak and nobody in house can coordinate, a full-service agency is worth the bundle, provided you check the depth of each discipline it sells. And if you run several specialists, the seams between them need an owner as much as the stages do.