The App Store keyword field: 100 characters that decide your rank

There is a field on the App Store Connect listing form that decides more about your future than any ad campaign. It is 100 characters long, no user ever sees it, and most developers fill it in five minutes, then never touch it again. It is the keyword field, and I ignored it for months while Meta and TikTok burned through my budget.

Paid traffic is rent, not equity. The downloads stop the moment the budget stops, and the only traffic that compounds is organic. On the App Store, organic traffic starts with that hidden field: Apple matches your app against search queries using your title, your subtitle and your keyword list. Get the list right and people searching for what your app does find you. Get it wrong and you are invisible, no matter how good the app is.

How the field works

One hundred characters, terms separated by commas. Two things people miss.

First, it is iOS only. Google Play has no keyword field: it indexes your title, short description and full description, so the same terms have to live inside your Google Play description text instead. If you only optimize one store, you are leaving half the searches on the table.

Second, every character counts. Each word you repeat from your title is a word you are not spending on a new search term. Your brand name does not belong there and duplicates are pure waste. You can also rewrite the field with every release, which makes it one of the cheapest ranking improvements a solo developer can ship.

The mistakes that waste the field

I have seen the classics often enough: the field that repeats the app name, the field in English US while the app targets France or Brazil, and the worst one, the field left completely empty, a free 100 character ranking advantage handed back to Apple.

The biggest mistake is not technical, it is linguistic. Most listings exist in English US only, and that cuts your app off from half the planet. Some languages bring volume, others bring revenue, and you cannot tell which until you are actually listed in them. A football app should not fight over "soccer" in the United States when football mad markets like Brazil, Germany and Vietnam search in their own language. The field is localizable per language, so you can target German queries in Germany, Japanese queries in Japan, and keep your English base. An app that only exists in English is invisible to every non-English query, often the cheapest organic clicks left in mobile.

What it costs to do this without going bankrupt

The traditional answer is a keyword research platform, and the prices are hard to stomach for a solo dev. AppTweak starts at $79 a month. Sensor Tower is quote only, with third party data putting entry around $500 a month. App Radar has a free tier that runs out fast, then $69. ASODesk is the budget pick at $29.99. They are good products, and if you run ten apps with real revenue they can pay for themselves. But when your app is still fighting for its first thousand downloads, paying a car payment every month for a dashboard is not a strategy. It is a subscription to anxiety, and it does not write your metadata for you.

What I ended up doing instead

I built AsoFast, free, open source under MIT, running entirely on my machine. It generates the whole listing with AI: title, subtitle, description, and a keyword list of around twenty terms built from what your app actually does, not from an expensive database. It respects the 100 character App Store limit, translates the listing and keywords into 80+ languages, and publishes straight to App Store Connect and Google Play. Nothing is sent to a server, your credentials stay on your computer, and you can read every line of the code.

You do not need a $500 dashboard to rank. You need a keyword field that answers the question people actually type, in the languages they actually type it. Fix it, ship the update, and the App Store starts doing your marketing for you. Ads become optional, and that is the whole point.