App Store optimization, the reference.

The numbers and rules you look up every release: screenshot sizes, character limits, keyword field tricks and the languages you can localize into. Free, no sign-up.

• Screenshot sizes

  App Store and Google Play screenshot sizes.

  Every App Store and Google Play screenshot size in pixels: iPhone 6.9" and 6.5", iPad 13", Android phones and tablets, plus counts, formats and rules.

• Character limits

  App Store and Google Play character limits.

  Character limits for every App Store and Google Play listing field: name, subtitle, keywords, promotional text, short and full description, What's New.

• Keyword field

  How to fill the App Store keyword field.

  How to use the App Store's 100-character keyword field: commas without spaces, no repeated words, singular forms, and what to leave out. With examples.

• App Store languages

  The 39 App Store listing languages.

  The full list of 39 App Store Connect listing languages with their locale codes, and which ones to localize first for more downloads.