What Is App Store Optimization (ASO)? A Definition That Actually Works
App store optimization (ASO) is a marketing system that presents your app to potential customers where they naturally look, in the App Store, Google Play and on the web, and then convinces them to download it with the intention to spend time and money in it. It covers visibility, conversion, testing, measurement and the product signals that drive rankings.
Key takeaways
- ASO has two borders: visibility turns strangers into store visitors, and conversion turns visitors into users.
- About two thirds of users come from store search and half of that is non-brand, so about a third of discoverability depends on ASO.
- Every traffic source, paid or organic, lands on the store listing before the download, which makes ASO a multiplier on all of your marketing.
- Store assets are only about half of the work; tests, measurement, operations, automation and intelligence are the rest.
- Judge ASO by paying customers won, not by downloads alone.
Why do most ASO definitions fail?
Most definitions describe one part of ASO and call it the whole. The old view says ASO is keywords and visibility. The newer view says it is conversion rate. Both leave you unsure how to make it work.
I see the same symptoms again and again: ASO explained as a single element, a plan that covers only screenshots and keywords, and a team that ignores the backend, reviews and reputation. When the definition is that narrow, the work stops at the edge of the store listing, and so do the results.
The definition I use is broader: a marketing system that presents the app to its potential customers in their natural habitats, then convinces them to download it with the intention to spend time and money in it. That means everything, everywhere, across all touchpoints.
What are the two jobs of app store optimization?
ASO does two jobs. Visibility turns internet strangers into store visitors. Conversion turns those visitors into app users. I call this Visibility Plus Conversion, and it is the simplest way to see where your app loses people.
| Border | Moves people from | To | How you measure it |
|---|---|---|---|
| Visibility | Strangers on the internet | Store visitors | Store impressions and page visits from new people |
| Conversion | Store visitors | App users | Installs divided by store page visitors |
Visibility comes from four places: store search, store browse (charts, editorial picks and similar apps), web search, and third-party apps, ads and cross-promotion. Search matters most, since about 70% of users prefer it. Browse is a supplement, around 10% of downloads, but it gives momentum.
Conversion rate (CVR), the share of people who saw your app or opened its store page and then installed it, depends on visuals, texts and keywords that show relevance. To apply the model:
- Map where strangers first meet the app online.
- Measure visibility: store impressions and page visits from new people.
- Measure conversion: installs divided by store page visitors.
- Work on whichever border loses the most people.
If your reports show ranks with no conversion data, or creative tests with no traffic plan, you are only working one border.
Why is ASO an ecosystem, not a channel?
Your app's rankings and conversion depend on far more than the store listing. I call this See ASO as an Ecosystem: product, people, gatekeepers and off-store factors all shape whether your app is found and downloaded.
- Product: the app itself, the devices and the operating systems it runs on.
- People: developers, users and their reviews.
- Gatekeepers: the platforms, platform owners and regulators.
- Off-store: web searches and social networks.
This is why I fix damaging product signals, such as crashes or low ratings, before polishing store assets. The top ranking factors I fix first are download velocity (how fast an app gains installs over a short period), technical health, ratings and engagement, plus one platform-specific factor on each store. A beautiful screenshot set cannot outrun a crash rate.
It is also why ASO is not a channel beside paid ads, CRM or monetization. Every traffic source lands on the store listing before the download. Good ASO makes that marketing profitable; bad ASO makes it wasteful. I go deeper on this in how ASO and paid user acquisition work together.
The ecosystem steps are short:
- List how each ecosystem part affects your app today.
- Audit outside factors: app stability, branding, reputation and web search presence.
- Fix damaging product signals, like crashes or low ratings, before polishing store assets.
- Count paying customers won, not just downloads: customer acquisition, not user acquisition.
What are the building blocks of ASO?
ASO has six families of building blocks, and store assets are only about half of them. I call this The ASO Building Blocks. In my map, assets account for 52 of the blocks; measurement has 14, tests 8, intelligence 8, operations 7 and automation 6.
| Family | What it covers |
|---|---|
| Assets | Visuals, texts, localization, ratings, featuring and ranking factors like stability |
| Tests | Store split tests and live tests after release |
| Operations | Roadmaps, rhythm and strategic focus |
| Measurement | Installs, conversion and ranks in dashboards |
| Automation | Repeat work handled by scripts and tools |
| Intelligence | Internal and external market knowledge you keep |
A plan that lists only store assets, with no roadmap rhythm and tools bought ad hoc, is half a plan. Inventory every block per store, because Apple's App Store and Google Play work differently; I cover the gaps in App Store vs Google Play ASO.
How does ASO make money, not just downloads?
ASO is a profit tool. I call this ASO as a Profit Tool: it turns wanderers into store visitors, users and, finally, paying customers. Search visitors arrive already decided, and they cost nothing to acquire.
The four stages look like this:
- Wanderers: no opportunity yet.
- Visitors: raw opportunity, via search or browse.
- Users: refined opportunity, after download.
- Customers: profit, through subscriptions or in-app spending.
Three signs tell me a team treats ASO as a traffic tactic instead: ASO is judged on installs and never on revenue, organic and paid users are valued the same, and nobody tracks spending from search-acquired users.
The fix is to tie search and browse work to visitor growth, show how a higher store CVR lowers paid cost per install (CPI, what you pay in ads for each new install), and report organic revenue as revenue with no ad cost. Organic here means installs that come without paid ads, from store search, browsing or word of mouth.
From the field
At a market-leading health and fitness app, an ecosystem-wide audit, not just a keyword and screenshot refresh, led to record rankings, organic installs and test win rates within three months. The audit looked at product signals, reputation and off-store presence alongside the listing itself.
Common mistakes when defining ASO
- Treating ASO as SEO for apps. Keywords matter, but the stores also rank on velocity, health, ratings and engagement. See ASO vs SEO for where the two disciplines meet.
- Optimizing one border only. Rank reports without conversion data, or creative tests without traffic, leave half the funnel unmanaged.
- Ignoring off-store strangers. Web search and social networks feed the store.
- Counting downloads instead of customers. The goal is people who stay and pay.
Frequently asked questions
What does ASO stand for?
ASO stands for app store optimization. It is the marketing work that makes an app visible where potential customers look, in Apple's App Store, Google Play and on the web, and then convinces the people who find it to download the app and spend time and money in it. It covers store assets, testing, measurement and the product signals behind rankings.
Is ASO just SEO for apps?
No. Keywords are one part of ASO, but the stores also rank apps on download velocity, technical health, ratings and engagement, and conversion depends on visuals and texts. Every traffic source, including paid ads, lands on the store listing before the download, so ASO multiplies all of your marketing rather than acting as a search channel beside it.
What are the two main parts of ASO?
Visibility and conversion. Visibility turns strangers on the internet into visitors of your store page, through store search, browse, web search and other apps. Conversion turns those visitors into users by persuading them with visuals, texts and proof of relevance. Measure both, then work on whichever border loses the most people.
How should you measure whether ASO is working?
Measure along the funnel: keyword rankings, store traffic, installs, conversion rate and, finally, revenue. Installs alone are not enough. Search visitors arrive with intent and cost nothing to acquire, so report the revenue from organic users as revenue with no ad cost, and judge ASO by the paying customers it brings.
If you want to turn this definition into a plan for your own app, start with how to build an ASO strategy, or see how I approach it in Appkitekt's app store optimization strategy service.
About the author
Binh Dang founded Appkitekt after leading ASO at Flo, Kovalee and Jellyfish, where he was Senior Director of ASO, and starting out as an ASO consultant at Phiture. He wrote The ASO Black Book.
See how Appkitekt runs ASO