What is App Store Optimization?

What is ASO?

App Store Optimization (ASO) is the process of improving an app's visibility in the Apple App Store and Google Play Store search results to increase organic downloads. It is the mobile equivalent of SEO: you optimize titles, descriptions, keywords, screenshots, and reviews to rank higher for relevant search terms.

Search is where most App Store discovery happens: Apple reports that 70% of App Store visitors use search to find apps, and that almost 65% of downloads happen directly after a search (Apple Ads, App Store, worldwide, 2022). That is why ranking for the right terms is high-leverage work — though no listing change comes with a promised outcome or date.

ASO vs SEO

SEO optimizes web pages for Google. ASO optimizes app listings for the App Store and Google Play. The principles are similar (keyword research, content optimization, authority signals) but the ranking factors are different. App stores weigh download velocity, rating quality, and engagement metrics more heavily than backlinks.

Why ASO matters

Paid and organic behave differently over time. Paid installs stop the day the budget stops. Metadata work stays in place and keeps earning against traffic you already have. The trade-off is real in both directions: paid buys volume on a schedule you control, and store work does not.

Conversion rate is the multiplier on everything else. Visitors reach your product page from search, from ads, from a link in a newsletter. A page that converts better lifts installs from all of those at once, which is usually why it pays before another traffic experiment does.

Two levers sit on that page. Your star rating shows beside your icon and title wherever your app appears; no public study prices a small rating move, so treat rating work as directional rather than forecastable. Localization is recommended by both Apple and Google, and neither publishes a conversion figure — so localize to reach and speak to more markets, not to hit a percentage.

Where your keywords actually live

Both stores read your listing text, but they give you different fields to write it into, and they publish different amounts of detail about what they do with it.

On iOS, work the fields Apple names

Apple describes App Store search results as based on a number of factors including text relevance, and lists that relevance as matches for your app’s title, subtitle, keywords and primary category. It also states that promotional text does not affect your app’s search ranking. Apple publishes no list of fields it excludes, so treat its positive list as the target: put your keyword thinking into the name, subtitle and keyword field, and write the description to convince someone who already tapped through.

On Google Play, everything is visible text

There is no hidden field, so every term you want to be found on has to sit in text a user can read. Google says your store listing text helps users discover your app, and keeps the weighting of its search algorithm proprietary. Its metadata policy is blunter: repetitive or irrelevant use of keywords in the app name, description or promotional description can result in an app being suspended. Write the description for a reader, not for a density target.

These limits move. Google cut the Play title cap from 50 characters to 30 in 2021, so check both stores’ current documentation before you plan around any number here. Verified against Apple and Google documentation in August 2026.

Choosing Your Category

Your category is the first ASO decision you make and the one people research least. It is not just a label: it decides which browse and filter surfaces you appear on, and on the App Store whether you sit on the Apps tab or the Games tab.

The two stores hand you a different set of levers, and this is one of the places where copying your iOS setup onto Android quietly loses you something.

App Store: two categories

Apple lets you assign a primary and a secondary category. The primary is the one that drives discoverability and placement; the secondary is an additional classification. Games can also choose up to two Games subcategories. You set both in App Store Connect under App Information.

Google Play: one category, plus five tags

Play gives you a single category with no secondary slot — you pick app or game first, then one category within it. What Play adds instead is up to five tags, which is where the nuance about what your app actually does belongs. Category changes can take up to 24 hours to appear on your listing.

How to actually pick

• Look at where comparable apps sit. Neither store tells you this, but the apps it shows as "similar" to a competitor do — that is exactly what the free app category picker reads for you.
• Do not chase an empty category. A quieter category is easier to chart in, but a category is a discovery surface: hiding a fitness app under Lifestyle to dodge Health & Fitness also hides it from the people searching for it.
• Describe the app honestly. Deliberate miscategorisation breaks both stores' review rules, and it puts you in front of an audience that did not want you.
• Revisit it when the app changes. Both stores let you change category later, so a pivot should trigger a re-check rather than a shrug.

Publishing for the first time? The step-by-step walkthroughs cover category selection in context: publishing on the App Store and publishing on Google Play.

Sources: Apple — App Store categories and discoverability · Google — Choose a category and tags. Verified 17 August 2026.

Keyword Research

Keyword research for ASO means finding the terms your target users type when looking for an app like yours. You want high search volume and low difficulty: terms where you can realistically rank in the top 10.

Volume vs Difficulty

Volume is how many people search for a term. ASOScan shows it as a 0–100 score in every market so you can prioritise the terms worth chasing.

Difficulty measures how hard it is to rank. ASOScan uses a 6-signal composite: rating count strength (33%), title-match density (27%), competitor density (15%), average star rating (13%), age strength (7%), chart presence (5%).

Long-tail keywords

Long-tail keywords (3+ words) have lower volume but much lower difficulty. "photo editor" is extremely competitive. "photo editor for instagram stories" is far more achievable. Start with long-tail, build authority, then target broader terms.

Free: check keyword density in a Play description, or generate name and subtitle ideas that still fit the limits.

Metadata Optimization

Free: count every field against the real limit — Apple counts characters, and counts every script the same, so a Japanese or Cyrillic keyword field fits far more terms than its English original.

Visual Assets

The first 3 screenshots are above the fold on both stores and drive 70%+ of install decisions. They are your most important conversion asset after the icon.

App icon: Must be distinctive at 1024x1024 AND legible at 60x60. Avoid text in the icon. Use a single strong visual concept.

Screenshots: Tell a story. Show the app in use, not abstract concepts. Lead with your strongest feature. Add captions with benefit-focused copy.

Preview video: Auto-plays on iOS. Keep it under 30 seconds. Show the actual UI in the first 3 seconds. No long intros.

Free: every required screenshot size, and a resizer that exports one screenshot at all of them.

Ratings & Reviews

Apps with a 4.0+ star rating get significantly more downloads than apps below 4.0. Ratings also directly influence search ranking, because both stores use them as a quality signal.

Timing matters. Ask for ratings after a positive moment (completed a task, achieved a goal). Never ask after an error or crash. Use the native in-app rating prompt (SKStoreReviewController on iOS, in-app review API on Android).

Review management. Reply to negative reviews within 24 hours. Acknowledge the issue, offer a fix. Users can update their rating after a reply.

Competitor Analysis

ASO does not happen in isolation. Your rankings depend on what competitors are doing. Track 3-5 direct competitors and monitor:

• Keyword rankings: which keywords do they rank for that you do not?
• Metadata changes: when they update their title or screenshots, something prompted it
• Rating trends: a competitor's rating drop is your opportunity
• Update frequency: apps that ship updates regularly tend to rank higher
• Category placement: which category each one chose, and whether they all agree

Free: see where a competitor's peer set sits, or score any live listing — yours or theirs.

AI in ASO

In 2026, AI is changing how ASO is done. Instead of manually writing title variants and guessing which keywords to target, AI can:

• Generate metadata variants using different strategies for the title, subtitle, and description
• Suggest keywords and explain why each one matters
• Analyze review sentiment to pull topics, bugs, and feature requests out of thousands of reviews
• Localize properly by writing copy in the right language for each market instead of translating it

ASOScan includes all of these capabilities. AI metadata generation is language-tier-aware (Native, Bilingual, English) for every App Store and Play Store market, and keyword suggestions include estimated difficulty and relevance.

Localize for every market, not just translate

Translation and keyword localization are two different jobs, and it is easy to ship the first and assume it covered the second. A translator turns your English copy into correct German. That is not the same as learning that a German user searching for tax software types steuererklärung, not the literal translation of “tax return”.

So run keyword research per market, in that market’s language, before anyone writes copy. Start from the words people in that country actually use for the problem, then build the title, subtitle and description around them. A term you never wrote into a locale’s metadata is not a term that listing can match.

Both stores support this. Apple’s product page guidance tells you to localize the description, screenshots and app previews for every market you sell in, and Google Play surfaces translation recommendations it says are likely to increase installs. Neither publishes a conversion-lift figure, so treat localization as reaching more people in their own words rather than a fixed percentage gain.

What actually changed recently

Custom product pages got a real upgrade

Since 29 October 2025 Apple lets you publish up to 70 custom product pages per app for iPhone and iPad, and assign keywords to each one. The keywords must come from your latest approved app version, so you cannot invent terms per page. A page with keywords assigned can appear in App Store search results for those keywords in place of your default product page — it swaps what the searcher sees rather than adding a second listing.

Screenshot caption text is contested, not settled

Appfigures reported in June 2025 that Apple appears to extract the words shown in iOS screenshots and treat them as metadata. A controlled test by ConsultMyApp found only one of 64 screenshot-derived phrases ranking without another explanation, and Apple has never documented the behaviour either way. Neither store documents reading anything out of a screenshot — the artwork or the words printed on it. Write real, readable words in your captions because they cost nothing and may help, but treat screenshots as a conversion lever and do not build a keyword strategy on them. Our screenshot size checker covers the specs.

Ranking weights did not publicly change

Neither store publishes its ranking weights or announces shifts in them, so treat any “the algorithm changed” claim without a primary source as speculation. Google does publish quality thresholds: an app whose user loss rate is 5% or higher, or whose ratio of daily to monthly active users is 8% or lower, can lose eligibility for certain Play Store tools and quality treatments, assessed over a minimum of 24 days in a 30-day period. That is a gate on store treatment, not a search-ranking weight.

How to measure ASO

Measure three things on a schedule, and you will see a change land before it shows up in your download numbers.

• Keyword rankings, per market and per platform. Positions move day to day, so read the trend across weeks rather than today’s number. ASOScan tracks 200 positions deep on both the App Store and Google Play.
• Listing conversion rate, from App Store Connect and Play Console. These are your own store numbers, and nothing outside your console replaces them.
• An overall score, checked weekly, so a metadata edit that quietly cost you something surfaces as a regression instead of a slow drift you notice a quarter later.

The trade-off is real: your console reports conversion but not which keyword produced it, and rank tracking shows position but not installs. Keep both, and change one lever at a time so the next result is attributable.

What to look for in an ASO tool

Start with coverage. If you ship on both the App Store and Google Play, a tool that reads only one leaves you guessing on the other. Same for storefronts: if you sell in Germany, Brazil and Japan, you need keyword and rank data for those countries, not just the US.

Then look past the dashboard. Keyword research, competitor metadata tracking and rank history over time are the parts that are hard to build. A clean interface over a thin dataset looks fine on day one and runs out by week three.

Check how pricing behaves with a portfolio. Per-app pricing is fine for one app and painful for twelve. Work out which shape fits you before you commit.

Then test any tool, ASOScan included, against an app you already know well. Run a free ASO scan and compare what it reports with what you already know about that app.

ASO Checklist

1. Confirm your category is the one comparable apps use (and set a secondary on iOS, tags on Android)
2. Research 20-30 target keywords using volume + difficulty data
3. Optimize your title with the primary keyword (front-loaded)
4. Write a subtitle (iOS) or short description (Android) with secondary keyword
5. Fill the iOS keyword field (100 characters, no spaces after commas, no duplicates from title)
6. Write the full description with natural keyword usage (3-5 mentions for Android)
7. Design the first 3 screenshots to tell a story and show the app in use
8. Ensure your icon is distinctive at both large and small sizes
9. Add a preview video (under 30 seconds, show UI in first 3 seconds)
10. Set up keyword rank tracking across your target countries
11. Add 3-5 competitors and monitor their metadata changes
12. Enable in-app rating prompts at positive moments
13. Reply to negative reviews within 24 hours
14. Review your ASO score weekly and address top recommendations
15. Use AI to generate metadata variants and compare against your current copy
16. Re-evaluate keyword targets monthly as volume and difficulty shift

ASO FAQ