The 30 characters that decide your app's future

Under your app's name on the App Store sits one line of up to 30 characters. It is indexed for search. It is shown in search results, on the product page and in the ads. It is, character for character, the most valuable copy you own, and most store pages treat it as an afterthought.

What the subtitle actually does

Two jobs at once. For Apple's search engine it is a keyword field that ranks. For a human it is the one sentence that explains what the app does before they decide whether to keep reading. Almost no other field in your listing does both. The keyword field is invisible to people. The description is barely read. The subtitle is the overlap.

Rule one: say what it does for them

"Kids bedtime stories" is a category. "Stories told in your own voice" is a reason. The best subtitles are a promise in the user's language, built out of the words they type when they look for an app like yours. Open your search terms report, find the phrases that already convert, and build from those.

Rule two: never repeat your title

If your app is called "Viola: Manifest & Affirm", putting "manifest" in the subtitle wastes characters and ranks nothing new. Apple already indexes the title. Every word in the subtitle should be a word that is not in the title.

Rule three: no filler

"The best", "all-in-one", "ultimate", "#1" and the app's own name are the most common ways to burn the 30 characters. Nobody searches for them, and nobody believes them.

Rule four: write it for the search result, not the product page

In search results, the subtitle sits directly under the name, next to the first screenshots. It is read in under a second, alongside competitors. Short, concrete and specific wins there. Clever loses.

Rule five: localize it properly

A subtitle translated word for word is usually a keyword that nobody in that market searches. Localize the intent, not the sentence. In some markets the strongest term is a different concept entirely.

Rule six: test it like a headline

Product page optimization lets you test the subtitle against variants on real traffic. Treat it like a landing page headline: one change at a time, enough traffic to decide, and keep the winner. We have seen subtitle changes move the conversion rate of a page more than a full screenshot redesign.

A quick way to audit yours

• Does it contain a word people actually search?
• Does it say what the user gets, not what the app is?
• Does it repeat anything from the title?
• Would it still make sense next to three competitors in a search result?

If the answer to any of these is wrong, you have the cheapest growth project in your roadmap sitting right there. App Store Optimization is part of what we do for other apps; the audit is free.