App Store Optimization (ASO): The Complete Free Guide

App Store Optimization (ASO) is the practice of improving your app’s store listing so it ranks higher in App Store and Google Play search and turns more visitors into installs. Best of all, you can do all of it for free using the tools Apple and Google already give you, and this guide walks through it in seven steps.

What is ASO (App Store Optimization)?

ASO is the process of improving how your mobile app appears and performs inside the Apple App Store and Google Play. In other words, think of it as SEO for apps: instead of ranking a web page on Google, you rank an app in store search and persuade people to tap “Get” or “Install”.

Checklist infographic showing app store optimization for iOS and Android at zero cost

ASO has two jobs:

Visibility. Make your app show up when people search for what it does, using the right keywords in the right fields.
Conversion. Make people who see your listing actually download, using a strong icon, screenshots, rating and description.

In fact, the two jobs feed each other. A listing that converts well sends the store positive signals, and better rankings then bring more visitors to convert.

Why does app store optimization matter, and how does it work?

ASO matters because store search is free, high-intent traffic, and you do not pay for each install. In contrast, paid acquisition is expensive by comparison: one 2026 industry guide puts average cost per install above $3.50 on iOS.

For starters, here is how the stores decide what to show:

Text relevance. Both stores match the search to the words in your listing. What they read differs by store (see the table below).
Behavior signals. Installs, ratings, retention, uninstalls and crashes tell the store whether people actually like your app. App Radar counts 16 ranking factors in 2026: 11 you write into your listing yourself and 5 the algorithm earns from how users behave around your app.
Quality. On Google Play, Android vitals (crash and ANR rates) can suppress rankings for unstable apps. On iOS, unstable releases tend to show up as lower ratings and conversion.
Conversion. If people visit but do not download, rankings tend to fall regardless of how good your keywords are.

However, neither Apple nor Google publishes exact ranking weights, so treat every number in ASO guides, including this one, as informed practice rather than official fact.

How is app store optimization different on iOS and Android?

The biggest difference is where keywords live. Apple has a hidden 100-character keyword field and ignores your long description for search. Google Play has no keyword field but reads your full 4,000-character description. Keep separate keyword lists for each store.

	Apple App Store	Google Play
Title	30 characters, indexed, highest weight	30 characters, indexed, highest weight
Second text line	Subtitle, 30 characters, indexed	Short description, 80 characters, indexed
Hidden keyword field	Yes, 100 characters, comma-separated	None
Long description	4,000 characters, not indexed	4,000 characters, indexed
Promotional text	170 characters, not indexed, editable without a new version	Not applicable
Free A/B testing	Product Page Optimization (creative assets only)	Store listing experiments (graphics and text; not the title)
Targeted pages	Custom Product Pages, up to 70	Custom store listings, up to 50
Time-limited promotion	In-app events (up to 5 live at once)	Promotional content (no set maximum)
Quality signals	Ratings, engagement, uninstalls	Ratings, engagement, Android vitals

Two more differences to know. Apple reviews metadata changes manually, so edits go live after review. Google Play review is largely automated, and Google changes its algorithm more often, so small metadata edits can move rankings quickly.

Step 1: How do you research app store optimization keywords for free?

Start with real search behavior, not guesses. These seven free methods work on both stores:

Write seed terms from user problems. List what people want done (“track my spending”, “plan meals”), not what your features are called.
Mine store autocomplete. Type a seed word letter by letter into the App Store and Google Play search bars and record every suggestion. The stores only suggest terms real people search.
Read competitor listings. Note the words the top five apps use in their titles, subtitles and short descriptions.
Check Apple’s keyword popularity (iOS). The Apple Ads keyword tools show Apple’s own popularity scores for free, which is the closest thing to official iOS search data. It has no difficulty score and is built for ad buying, so use it only to compare candidates.
Use your own data once you are live. App Store Connect shows the search terms that led to your app. Google Play Console shows the queries that led to your listing, with visitors and conversion per term.
Try free tiers of ASO tools. ASOMobile and App Radar both offer free plans with keyword suggestions and tracking. Treat their search-volume numbers as estimates: no free tool gives validated absolute search counts for either store.
Add Google Trends for demand direction. It will not show app store volume, but it shows whether interest in a topic is rising.

How do you pick the best app store optimization keywords?

Then score each candidate on three things: relevance (does your app truly do this), popularity (do people search it) and competition (can a new app realistically rank). Therefore, a new app should lean on specific, lower-competition phrases first, and chase broad terms later.

Also, keep one keyword list for iOS and a separate one for Android, because the stores read different fields.

Step 2: How do you write your title, subtitle and descriptions for app store optimization?

Place your best keyword in the title, your second-best in the subtitle or short description, and everything else in the remaining fields. Always write so a human would want to read it. Keyword stuffing hurts conversion and risks rejection. For help writing copy that people and answer engines both trust, see our AEO content writing rules.

On iOS (Apple App Store)

App name (30 characters). Highest ranking weight. Use brand plus your strongest keyword, for example “Penny: Budget Planner” (an illustrative name).
Subtitle (30 characters). State the main benefit with a second keyword, for example “Expense Tracker & Savings”. Do not repeat words already in the name.
Keyword field (100 characters). Hidden from users. Separate terms with commas and no spaces, use single forms instead of plurals, and never repeat words from your name or subtitle. Apple combines words across all three fields, so “budget” in the name and “planner” in the keyword field can still match “budget planner”.
Count your budget. Name, subtitle and keyword field give you 160 indexed characters in total, so every character counts. Some ASO sources report that in-app purchase names and in-app event titles add more indexed text, but Apple does not clearly confirm this, so treat it as a bonus rather than a plan.
Description (4,000 characters). Not indexed for search. Write the first two lines to persuade, since most people never expand it.
Promotional text (170 characters). Not indexed, but you can change it any time without a new app version, so use it for current offers.

On Android (Google Play)

Title (30 characters). Highest weight. Google reduced the limit from 50 to 30 in 2021, so some older guides still show the wrong number.
Short description (80 characters). Indexed and shown right under the screenshots. Put your top two or three keywords here in one clear sentence of benefit.
Full description (4,000 characters). Fully indexed. Mention each target keyword naturally a few times and write short paragraphs and bullets. Google now favors contextual use over exact-match repetition.
Developer name. Carries low weight but is also read, so keep it consistent.

Unlike on iOS, there is no hidden keyword field on Google Play, so every keyword you target is also copy that users read.

Step 3: How do you optimize your icon, screenshots and video?

Visuals do not directly carry keywords, but they decide whether a searcher taps and installs. One industry comparison cites Apple’s own guidance of roughly 1.6% average conversion for default product pages, so small gains matter.

Icon. Use one simple, bold idea that stays readable at small sizes and stands apart from competitors. One source citing Google case studies says icon changes produce the biggest conversion swings, so test this first.
Screenshots. On the App Store, the first three screenshots appear in search results, so put your single biggest benefit in the first one. Use large caption text, one message per screenshot, and show the real app.
Preview video. Optional on both stores. If you make one, show the core action in the first few seconds, since many people never watch to the end.
Feature graphic (Google Play). The banner at the top of your listing. Keep it clean and consistent with your icon.
Order matters. Tell a story: problem, main benefit, key feature, proof, then call to action.

Free tools such as Figma or Canva are enough to design every asset your app store optimization needs. If you want visuals that do not look generic, see our guide to design tools that make apps look anti-AI slop.

Steps 4 to 6: Ratings, app quality and localization

Step 4: How do you earn better ratings and reviews?

Ask at a happy moment. Trigger the store’s own review prompt right after a user completes something rewarding, never on first launch or after an error. On iOS the system limits you to three prompts per year, so use them carefully.
Reply to reviews. Answer complaints politely and say what you fixed. Some ASO sources say Google Play also reads review text and developer replies as keyword signals, so helpful replies can double as relevance.
Flag policy-violating reviews. Both stores let you request removal of spam or abusive reviews.
Route unhappy users to support first. A simple “Send feedback” option inside the app keeps frustrated users from going straight to a one-star review.

Step 5: How does app quality affect ASO?

Quality is ranking insurance for app store optimization in 2026. On Google Play, Android vitals tracks crashes and ANRs (app not responding). One source reports ranking suppression when crash rates pass roughly 1.09% or ANR rates pass 0.47% (verify the current thresholds in Play Console). Before each release, also run through our pre-launch security checklist for vibe coders to catch problems that hurt ratings.

Check Android vitals and the pre-launch report in Play Console. Both are free, and the pre-launch report tests your app on real devices.
Set a crash-free target before each release so ratings do not drop after an update.
Ship updates regularly. Fresh, maintained apps tend to rank better, and release notes are a chance to mention features.
Fix retention, not just installs. Industry commentary describes a 2026 shift from ranking by install volume toward retention and engagement, so an app people keep using outranks one people delete.

Step 6: How do you localize for more markets?

Localize, do not just translate. Research keywords in each language, because the best local search term is often not a direct translation.
Start with your biggest user countries, then add languages based on your analytics.
Use extra keyword space on iOS. Apple lets some storefronts index a second language’s keywords. For example, one source says Spanish (Mexico) adds another 100 keyword characters on the US storefront.
Localize screenshots too, with local captions, currency and holidays.

Step 7: How do you use free A/B tests, custom pages and events?

Both stores give you free experiment tools for app store optimization. Use them after your basics are done.

Google Play store listing experiments. In Play Console, test icon, feature graphic, screenshots and the short and full descriptions. You cannot test the app title. Run each test for at least seven days.
Apple Product Page Optimization (PPO). In App Store Connect, test up to three variants against your original, using icons, screenshots and preview videos only. Descriptions and promotional text cannot be tested. Since iOS 17, running tests are no longer interrupted when you publish a new app version.
Test one change at a time. Changing everything at once means you cannot tell what worked. Aim for at least 1,000 impressions per variant and do not stop early on a lucky streak.
Custom Product Pages (iOS). Apple now allows up to 70 per app. These are not A/B tests. They are alternate pages for specific audiences, such as a different campaign or keyword intent. Reports also say organic search terms can now route to a custom page, not only ads.
Custom store listings (Google Play). Up to 50 per app, targeted by country, user type or traffic source.
In-app events (iOS). Up to five can be live at once. Event cards appear in search, on your product page and in editorial spots, and several ASO sources report event titles now help search indexing.
Promotional content (Google Play). The Android equivalent. It can appear in search results, though it is unclear whether its keywords are indexed.

How do you do app store optimization at zero cost?

Zero-cost ASO means spending nothing on ASO tools or ads. You still need a developer account to publish: Apple’s Developer Program is paid yearly, and Google Play charges a one-time registration fee (reported at $25). Fortunately, everything below is free once you have those.

Your zero-cost app store optimization checklist

First, write 20 to 30 seed keywords from user problems, then expand them with store autocomplete on both stores
Check competitor titles, subtitles and short descriptions for gaps
Compare iOS candidates in Apple’s keyword popularity tool
Then, put keyword one in the title and keyword two in the subtitle (iOS) or short description (Android)
Fill all 100 characters of the iOS keyword field with no repeats and no spaces after commas
Also, write a natural 4,000-character Google Play description that uses each target keyword
Next, design the icon and first three screenshots to show one clear benefit each
After launch, add an in-app review prompt after a successful moment
Meanwhile, check Android vitals and fix crashes before the next release
Localize into your top two or three markets
Finally, run one Play listing experiment and one iOS PPO test, one change each
Lastly, review App Store Connect and Play Console search data monthly and update your keywords

Free tools worth using

Tool	Store	What you get for free
App Store Connect (App Analytics)	iOS	Search terms that led to your app, impressions, conversion, PPO tests, in-app events
Google Play Console	Android	Search terms, listing visitors, store listing experiments, Android vitals, pre-launch report
Apple Ads keyword tool	iOS	Apple’s own keyword popularity scores
Store search autocomplete	Both	Real user search suggestions
ASOMobile free plan	Both	Keyword suggestions, keyword tracking, category rankings
App Radar free tier	Both	Limited keyword and optimization-score tools
Google Trends	Neither	Demand direction for topics
Figma or Canva	Neither	Icon and screenshot design

The free console data shows what is already happening. It cannot tell you which keywords to target or what competitors rank for, which is why autocomplete and competitor research come first.

Which app store optimization metrics should you track, and what mistakes should you avoid?

Metrics to review monthly

Impressions (App Store) or store listing visitors (Google Play): how many people see your app. Rising numbers mean your keywords are working.
Product page views and conversion rate: the share of viewers who download. This shows whether your visuals and copy persuade. One source notes Play Console switched its listing reports from conversion rate to click-through rate in July 2026, so check which your console shows.
Keyword rankings for your top 10 to 20 terms.
Average rating and review count, plus review themes.
Crash and ANR rates, and retention at day 1 and day 7.

Common ASO mistakes

Repeating the same word in the title, subtitle and keyword field on iOS.
Stuffing keywords so the listing no longer reads naturally.
Changing every element at once, so you cannot tell what helped.
Using one strategy for both stores instead of separate keyword lists.
Translating without researching local keywords.
Ignoring updates, ratings and crash rates.
Treating ASO as a one-time job. The teams that win run it as a continuous loop of research, change, measure.

App store optimization FAQs

What does ASO stand for? App Store Optimization: improving an app’s visibility and conversion rate in the Apple App Store and Google Play.

Is ASO free? Yes. In fact, the core work uses free tools from Apple and Google. Paid tools only speed up research. You still pay for developer accounts to publish.

How is ASO different from SEO? Simply put, SEO ranks web pages in web search. ASO ranks apps inside app stores, where ratings, installs, retention and listing visuals matter alongside keywords.

Does Google Play index the description but Apple does not? Correct. In short, Google Play indexes the full 4,000-character description, while Apple searches the name, subtitle and keyword field.

How long does ASO take to work? However, neither store publishes a timeline. Expect metadata changes to take effect after review and indexing, and judge results over several weeks, not days.

How often should I update my keywords? Ideally, review monthly and refresh every quarter, or sooner after a major release, using your own search-term data.

Do ratings affect rankings? Yes. Specifically, ratings and reviews are ranking signals and also drive conversion.

Does ASO still matter now that AI search is rising? Yes. For example, guides in 2026 report that AI-assisted search in both stores still relies on listing metadata and behavior signals.

Can I use the same keywords on iOS and Android? For best results, start from one research list, but build separate fields for each store, because their indexed fields and limits differ.

Sources

Search-result pages consulted on 11 Nov 2026. Apple and Google do not publish full ranking weights, so figures from third-party ASO sites are marked as reported.