For iOS apps: check your App Store name, subtitle and keyword field, get a cleaned keyword field without wasted characters, and find keywords the top apps for a search use.
App Store keyword optimizer
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The App Store reads three fields for search: the app name (30 characters), the subtitle (30) and the hidden keyword field (100). It splits them into words and combines those words into the phrases people type. That leads to three rules:
Use each word once. A word in the name already counts; repeating it in the subtitle or keyword field adds nothing.
No spaces, no filler. Separate keywords with commas only, and skip words like “app” or “free”.
Single words over phrases. “meal,planner,recipes” covers “meal planner”, “recipe planner” and more.
Put your most important keyword in the name, the next ones in the subtitle, and everything else in the keyword field. Each localization has its own fields, so a German listing gives you another 160 characters. Check the result with the App Store listing analyzer, do the same for Android with the Google Play ASO tool, and read more about App Store keywords and app store optimization.
Keywords from your reviews
Your users describe your app in their own words, and those are often the words they search for. Read your app reviews for features and problems you never put into your metadata. allstarsbot posts every new App Store and Google Play review to Slack or Microsoft Teams, so these words come to you.
FAQ
How long can the App Store keyword field be?
100 characters, comma-separated, per language. The app name and the subtitle have 30 characters each. All three are indexed for search; the description isn’t.
Should I put spaces after the commas?
No. Spaces count as characters, so photo,editor,collage gives you more room than photo, editor, collage. The tool removes them in the cleaned version.
Do I need to repeat words from my app name in the keyword field?
No. The name, subtitle and keyword field are combined, so a word that is already in the name counts in every search phrase. Repeating it only wastes characters.
Single words or phrases?
Mostly single words. The App Store combines the words from your name, subtitle and keyword field into phrases, so budget,planner also covers “budget planner”. Use phrases only when the order matters.
Does this tool show search volume?
No. Apple doesn’t publish search volume; tools that show it estimate it from paid data. The keyword ideas here show which words the apps that appear for a search use in their names and descriptions, which is a good start for finding words you’re missing. More in App Store keywords.
What about Google Play?
Google Play has no keyword field. It uses the title (30 characters), the short description (80) and the full description (4,000) for search, so put your main keywords naturally into those texts. Check them with the free Google Play ASO tool.