The App Store description is the long-form product page field. It is where you explain the app's features and functionality in plain language for people who need more context before installing.
The official limit
Apple limits the description to 4000 characters. The field supports plain text with line breaks as needed, but Apple says HTML is not supported.
A useful structure
- First paragraph: who the app is for and what it helps them do.
- Middle section: five to seven concrete features.
- Trust section: privacy, sync, offline, or support details.
- Close: a clear next step without hype.
SEO detail that matters
Apple notes that the description can be used for web engine search results once the app is released. Write for humans first, but include the words users would naturally search for.
Source notes
Apple's platform version information reference confirms the 4000 character limit, plain-text requirement, and web search-result use.