If you've done any reading on App Store optimization best practices, you've probably seen conflicting advice about the description. Some guides say to load it with keywords. Others say it doesn't matter for ranking at all. Developers spend hours rewriting descriptions and wondering if it moved anything.
Here's the direct answer: Apple does not index the App Store description for keyword search ranking. Keywords in your description do not help you rank for those terms. The description has no effect on which searches your app appears in.
That's confirmed by Apple's own developer documentation and consistently validated by ASO experiments where description changes produce zero ranking movement.
What the description does affect is different — and worth understanding clearly so you spend your time on what actually works.
What Apple Actually Indexes for Search
Apple's search algorithm pulls from three metadata fields when determining which apps to rank for a given query:
App title (30 characters) — the highest-weighted field. Keywords here carry the most ranking power.
Subtitle (30 characters) — the second-highest weighted field. Keywords here rank better than the same keywords in the keyword field.
Keyword field (100 characters per locale) — the dedicated search signal field. Space-separated, invisible to users, indexed by Apple.
That's it. Those are the fields that affect search ranking. The description, the promotional text, the "What's New" release notes — none of these are indexed for keyword search.
If your description contains "habit tracker" fifty times and your keyword field is blank, you have zero keyword coverage for "habit tracker" in search. If your title says "Streaks — Habit Tracker" and your keyword field is filled with researched terms, you rank well — regardless of what your description says.
What the Description Actually Does
The description affects conversion — not ranking. Conversion is what happens after a user finds your app in search results and taps your listing. The question the description answers is: does this person download the app after reading it?
Conversion rate matters indirectly to ranking. Apple tracks whether users who see your app in search results download it. A higher conversion rate sends a positive signal that your app is relevant to the search query, which over time can support better ranking positions. But that's the conversion rate working, not the description keywords.
A well-written description improves conversion by:
Communicating the core value quickly. Most users don't read more than the first two lines before tapping "more" or leaving. Your opening sentence should answer "what does this app do and why do I want it" in plain language.
Addressing the main user concern. For paid apps and subscription apps, the primary concern is usually "is this worth paying for?" The description is the place to address that directly — specific features, what's included, what makes it better than the free alternatives.
Using natural language, not keyword stuffing. A description stuffed with repeated keywords reads as spam to users. "This habit tracker app is the best habit tracking app for daily habit tracking and building habits with a habit tracker" is recognizably bad. It doesn't help ranking, and it hurts conversion by signaling that the listing is low quality.
Being localized properly. A machine-translated description in Japanese, German, or Portuguese reads awkwardly to native speakers and reduces trust. Since the description is purely a conversion tool, quality matters more than keyword density.
The Promotional Text Field
App Store Connect has a separate field above the description called Promotional Text — a 170-character field that can be updated without submitting a new app version. This also doesn't affect search ranking, but it's useful for time-sensitive messaging: a sale, a new feature announcement, an award or press mention.
Because it can be updated independently of the app, it's worth keeping current. But don't confuse it with a ranking lever — it isn't one.
What's New / Release Notes
The "What's New" section that appears with each app update also doesn't affect keyword search ranking. It's useful for communicating to existing users what changed in an update, and a well-written "What's New" can improve your update adoption rate. It doesn't help you rank for new keywords.
The Time Allocation Mistake
The most common result of the "keywords in description" myth: developers spend hours rewriting descriptions, adding keywords, refining copy — and see no ranking movement. Then they conclude that ASO doesn't work, when in reality they were optimizing the wrong field entirely.
The ranking levers by impact:
- Title: highest impact, 30 characters, directly affects which searches you appear in
- Subtitle: second-highest impact, 30 characters, directly affects ranking
- Keyword field: direct ranking signal, 100 characters per locale, most apps severely underuse it
- International keyword fields: highest ROI for most apps, blank for most locales, directly determines whether you rank in non-English markets
A developer who rewrites their description and ignores their keyword field has done nothing for ranking while spending meaningful time. A developer who fills their keyword field correctly and adds localized metadata for 5 markets has likely 10x'd their organic search footprint — in an afternoon.
How to Actually Write a Good Description
Since the description is purely a conversion tool, here's what makes one work:
Open with the clearest possible statement of what the app does. Not a tagline. Not a mission statement. "FocusFlow is a Pomodoro timer for iPhone that helps you work in focused 25-minute sessions." Users decide in two sentences whether to keep reading.
Follow with the most compelling specific features. "Customizable session and break lengths. Background timer continues when the screen is off. No account required." Specificity beats vague benefits.
Address objections. If you have a free tier, say so early. If there's a subscription, explain what it includes. If the app is one-time purchase, say it. Price uncertainty is a conversion killer.
End with a clear action or value statement. What does the user get from downloading? Be concrete.
Keep it shorter than you think. Most users won't read past the fold. A tight, clear 150-word description outperforms a keyword-heavy 500-word description every time — for the simple reason that users can read it.
The Bottom Line on App Store Description Best Practices
Spend minimal time on the description relative to the metadata fields that actually affect ranking. Write it clearly, localize it properly for each market, and don't stuff it with keywords that won't move anything.
Spend significant time on your title, subtitle, and keyword field — especially the keyword fields for non-English locales, which are blank for most apps and represent the highest-ROI ASO work available to most indie developers.
If you want to know what your keyword fields should actually contain — per market, with competitor gap analysis — that's exactly what LocalizeRank delivers. Starting at $49 for 5 markets.