Best CRO Agency for Mobile Subscription Apps: Onboarding & Paywall Optimization

Founders & growth leads ask: Losing users between onboarding, trial & paid? Why do web CRO agencies keep missing the leak?

UA teams ask: Paid traffic leaking before the subscription? Not enough traffic to test everything?

Product teams ask: Engineers ready to build, but nobody to design the test? Or no engineers to spare at all?

And everyone asks: Screenshot tests or paywall tests? Which agency fits? What if we get burned again?

TLDR: Roastmyapp is a CRO agency for mobile subscription apps with one answer for each of those questions. We find the leak, rank the fix for your traffic & design the experiment. Then we ship the test, or hand your product team the specs. From USD $1,000 for one paywall test.

Here’s what’s coming next:

1. What app CRO fixes → & why web CRO tools miss your leak.
2. How we find the exact screen → leaking revenue between onboarding, trial & paid.
3. The full journey review → from paid ad to first renewal.
4. How we rank tests for your volume → when traffic is limited.
5. Paywall experiments your team implements → our 7-part handoff package.
6. 10+ experiments, done for you → designed, coded & shipped.
7. App Store CRO vs in-app CRO → & the 8 metrics we track.
8. 4 partner types & a 6-question scorecard → to pick the right agency.
9. Who does the work → proof, guarantee & 4 ways to work with us.

Web CRO agencies miss your leak? Here’s what app CRO fixes instead

Most CRO agencies grew up on websites. Your app converts on 3 native surfaces: the App Store page, onboarding & paywall. Website CRO tools run on none of them.

App conversion rate optimization turns more of your installs into paying subscribers. A mobile app CRO agency [also called a conversion optimization agency] researches, designs & A/B tests your onboarding, paywall, pricing, post-purchase & cancellation screens. Then reads every result on revenue per user.

Your first session decides most of your revenue. Across our client apps, 70 to 85% of trial starts happen at the onboarding paywall placement.

So job #1 is naming the screen leaking your revenue.

Losing users between onboarding, trial & paid? Here’s how we find the exact screen

You see one number: install-to-paid. You don’t see which of your 20+ screens dragged the number down.

RevenueCat’s State of Subscription Apps 2026 puts median D35 download-to-paid at 2.6% in North America & 2.0% in Western Europe. A benchmark tells you a leak exists. Not where.

How we split your funnel into 4 stages:

1. Install → paywall view → a leak here points to a long onboarding or a late paywall.
2. Paywall view → trial → weak offer, layout or copy.
3. Trial → paid → value not felt during the trial, or billing anxiety.
4. Paid → renewal → weak habit loop, no save offer.

What happens in week 1:

• Screen-by-screen drop-off → a 15 to 20%+ drop between 2 screens gets flagged.
• Placement & segment reads → by traffic source, country, platform & quiz answer.
• Past test review → no losing idea runs twice.
• Customer & competitor research → your users’ own words, plus 30 to 50 competitor apps mapped in Figma.

What you get: a funnel benchmark report with every revenue leak ranked by size.

For paid traffic, the leak often opens before your app. So we look there too.

Paid traffic leaking before the subscription? We review the full journey, ad to paid

Your ad promises one outcome. Your onboarding opens with a generic welcome screen. Your UA team owns the ad, your product team owns the app. Nobody owns the handoff.

We map your 8-step journey screen by screen in Figma:

1. Ad creative & angle
2. Paid landing page or web funnel
3. Custom product page & App Store listing
4. Install & deep link
5. Onboarding funnel
6. Paywall, pricing & offer
7. Post-purchase screens
8. Trial-to-paid, renewal & cancellation flow

At every handoff we check 3 things:

1. Message match → does the ad’s promise show up on screen 1?
2. Routing → does each ad angle land on a matching custom product page & onboarding path?
3. Personalization → does the paywall change by traffic source & quiz answer?

What we don’t do: buy media. We work with your UA team or agency instead.

Not enough traffic to test everything? Here’s how we rank tests for your volume

Small tests plus low traffic equals months of flat results. At an 8% trial start rate:

• Detect a 20% lift → about 4,900 users per variant reaching the paywall.
• Detect a 10% lift → about 18,900 users per variant.

[80% power, 5% significance, two-sided test.]

Say you get 1,000 downloads a day & 60% reach the paywall [600 paywall views a day]. A 20% lift test takes about 17 days. A 10% lift test takes about 63 days.

Our 6 rules for limited traffic:

1. Test where traffic lands first → the onboarding paywall placement.
2. Big swings first → pricing, trial offer & onboarding narrative before button tests.
3. One test per screen → tests on separate screens run in parallel.
4. RICE score every idea → with Confidence tied to your data & research.
5. Call winners on proceeds per user → after trials convert or cancel, with refund & renewal guardrails.
6. Keep a holdout → on your original flow, to see the total stacked lift.

What your traffic supports:

• Under 300 downloads a day → research & big before/after changes.
• 300 to 1,000 → one big-swing test at a time, 3 to 8 weeks each.
• 1,000 to 15,000+ → paywall & onboarding tests in parallel, 2 to 4 weeks each.

UK teams: we work async from GMT+6, 5 to 6 hours ahead of London. Your morning starts with our Slack updates. We test localized GBP pricing too.

Engineers ready to build, but nobody to design the test? We design paywall experiments your team implements

Your product team ships fast. But nobody on the team has run 50+ paywall tests. So the backlog fills with ideas copied from competitor screenshots, launched without a clear hypothesis.

We own the thinking & design. Your team owns the build. Every experiment arrives as a 7-part handoff package:

1. Hypothesis & impact brief → problem, solution, primary metric & guardrails.
2. RICE score & sequence → where the test sits on your roadmap.
3. Dev-ready Figma designs → every variant, every state, localized prices.
4. Copy deck → every word, traced back to your users’ own language.
5. Clickable prototype → your engineers see the motion & logic before coding.
6. Analytics event spec → named for Mixpanel, Amplitude or PostHog.
7. Test setup & QA checklist → traffic split, RevenueCat or Superwall offering IDs, purchase & restore checks.

While your team builds, we review in Figma comments & Loom. After launch, we read the results & write the next iteration.

This fits you if you have iOS, Android or React Native engineers with sprint capacity, and you run RevenueCat, Superwall, Adapty, Purchasely or a custom paywall.

Price: when your team builds, the price drops to match. We set the number after your free audit.

No engineers to spare? We design, code & ship 10+ experiments for you

Your engineers own the product roadmap. Growth tests sit in the backlog for another quarter.

So we own the full cycle with our 11FA Monetization & CRO Framework. 11 focus areas, 5 steps:

1. Benchmark & audit your funnel data
2. Mine customer & competitor insights
3. Rank the highest-leverage experiments
4. Design, build & launch experiments
5. Compound wins & learn from losses

Timeline: audit in week 1, first paywall test live in week 2, onboarding overhaul live in week 3. Each test runs 2 to 4 weeks.

We build in Swift, React Native, Flutter, or the RevenueCat & Superwall builders. You keep everything: roadmap, research, briefs, designs & code.

3 ways to split the work:

1. Done-for-you → we design & code.
2. Design handoff → we design, your team codes.
3. 1:1 advisory → your team does both, we direct.

Screenshot tests or paywall tests? App Store CRO vs in-app CRO

Many “best app CRO agency” lists rank screenshot specialists next to paywall specialists. They fix different problems.

• App Store CRO → tests icon, screenshots & custom product pages in Apple Product Page Optimization & Google Play experiments. Fixes too few installs.
• In-app CRO → tests onboarding, paywall, pricing & cancellation flow in RevenueCat, Superwall, Adapty or custom code. Fixes too few payers.

We cover visual ASO as 1 of our 11 focus areas. The other 10 sit inside your app.

The 8 metrics we track [& the guardrail paired with each]:

1. Product page conversion → guarded by install-to-paid of the new installs.
2. Paywall view rate → guarded by onboarding completion.
3. Trial start rate → guarded by trial-to-paid.
4. Trial-to-paid → guarded by refund rate.
5. Install-to-paid [D35] → guarded by proceeds per user.
6. Proceeds per user → guarded by refund & renewal rates.
7. Refund rate → read on every pricing test.
8. 1st renewal rate → guarded by D30 retention.

Not sure which agency fits? 4 partner types & a 6-question scorecard

Most “best agency” lists come from agencies ranking themselves first. Pick by the number holding you back instead:

1. UA & creative agency → fixes cost per install. Pick when install-to-paid sits at or above benchmark.
2. ASO agency → fixes store listing conversion. Pick when product page conversion lags your category.
3. Paywall platform growth team → fixes paywall tests on one platform. Pick when you run the same platform.
4. Mobile app CRO agency [Roastmyapp] → fixes onboarding, paywall, pricing & cancellation. Pick when installs arrive but payers don’t.

Then ask any agency these 6 questions [us included]:

1. Which metric decides a winner? → pass: proceeds per user, read after trials end.
2. Which clients run subscription apps? → pass: named apps, not games or ecommerce.
3. How many users does a test need at our traffic? → pass: a number from your own baseline.
4. Who designs & who codes? → pass: a clear split, with an option for your team to build.
5. What don’t you do? → pass: a direct list.
6. Who owns the work when we stop? → pass: you, in writing.

Burned by an agency before? Here’s who does the work

• Founder-led → Muhammad Rahat leads every engagement. No bait-and-switch to juniors.
• One price, paid once → no retainer, no auto-renewal.
• Positive ROI guarantee → we keep running experiments until you reach positive ROI on our fee.
• You own everything → roadmap, research, designs & code.
• Outside reference → The Social Outline’s Sept 2026 agency comparison lists Roastmyapp for teams whose installs don’t turn into payers.

“Looks like the onboarding variant finally pulled ahead. You have done amazing work for us! Highly appreciated.” [Colby Schmidt, Co-Founder @ Coursology app]

“It felt like Roast My App was part of the team, which is not common when you work with contractors and when you outsource work. I would recommend it to any founder who’s trying to reach profitability for a subscription app.” [Grégoire Thomas, Co-Founder @ Mr.Arthur app]

Ready to fix the leak? 4 ways to work with Roastmyapp

1. Monetization & CRO Program → USD $15,000 one-time, 3 months, 10+ experiments. For $50K to $500K+ MRR or 1K to 15K+ daily downloads.
2. Onboarding Design & Optimization Sprint → $7,500 for 2 funnels, $4,000 for 1. For 1,000+ daily downloads.
3. 1 Paywall A/B Test → $1,000 one-time. Test the waters first.
4. 1:1 Advisory → $1,500 a month. You build, we direct.

Not a fit: pre-PMF apps, low traffic or weak retention. We don’t run paid UA, keyword ASO or ad monetization.

Made it this far? Congrats, you’re the type who see things through. Here are 3 more cool resources for you to check out.

1. 51 paywall experiments [with examples]: my paywall experiment library, organised across 5 monetization levers.
2. 80 mobile app onboarding screens: original designs from onboarding experiments we ran at Roastmyapp.
3. 17 paywall optimization mistakes: common mistakes I’ve seen app teams make, with fixes.

Need help fixing your onboarding & paywall leaks?

Start with a free CRO audit of your app where we schedule a 30-minute coffee chat on Google Meet.

I try to do this review for 5 apps completely FREE every month.

By the end, people walk away knowing their 3 biggest blockers costing them real money.

And if I think my app monetization & CRO program isn’t a good fit for your app, I’ll tell you so too.

Find more on my 11FA mobile app monetization & CRO framework here →

Best,

Muhammad Rahat

Founder @ Roast My App LLC