Writing the app store description
The app store description does different jobs on each store. Google Play indexes the full 4,000-character description, so keyword placement there affects rankings; Apple does not index its description at all, so on iOS it is purely a conversion asset. Both stores collapse the text behind a 'more' tap, so the first three lines — roughly 250 characters — carry nearly all the impact. Open with the outcome your app delivers, follow with three to five benefit lines, then add proof, feature detail and support info. On Play, repeat each priority keyword three to five times in natural sentences; padding beyond that risks a policy strike without adding rank.
Key takeaways
- Google Play indexes the full description; Apple does not index its description at all.
- Only the first ~250 characters are visible before the 'more' tap — write them as the whole pitch.
- Three to five natural repetitions of a priority keyword is the useful range on Play; more is a policy risk.
- Apple's 170-character promotional text sits above the description and can be changed without a build.
- Google Play's 80-character short description is indexed and is the most under-used field on Android.
The fields and their limits
| Field | Store | Limit | Indexed? |
|---|---|---|---|
| Promotional text | App Store | 170 characters | No |
| Description | App Store | 4,000 characters | No |
| What's New | App Store | 4,000 characters | No |
| Short description | Google Play | 80 characters | Yes |
| Full description | Google Play | 4,000 characters | Yes |
A structure that works on both stores
- 1
Outcome line
One sentence naming who the app is for and what they get. This is the line most readers will ever see.
- 2
Benefit block
Three to five short lines, each a job the user can do. Lead each with a verb.
- 3
Proof
Awards, notable coverage, user counts or ratings — concrete and checkable, never superlatives.
- 4
Feature detail
The full capability list for the small share of readers who expand. This is where Play keyword coverage is built out.
- 5
Plans and pricing
If you sell a subscription, state it plainly here; unclear pricing produces refunds and one-star reviews.
- 6
Support and legal
Contact route, privacy and terms links, and any regional disclosure your category needs.
Keyword placement on Google Play
Play reads the title, short description and full description as ranking input, weighted roughly in that order. A priority term should appear once in the title if it earns the space, once in the short description, and three to five times across the full description in ordinary sentences.
Do not build a keyword list block at the bottom of the description. It reads badly to humans, does not outperform natural placement, and is the pattern Play's spam policy targets.
Worked example: rewriting a description that reads like a brochure
A photo editor's description opened with three sentences about the company's mission and named the product's features in the fourth paragraph. On Google Play, where the full description is indexed, that structure buries every priority keyword below the fold and past the point most readers stop. On the App Store, where the description is not indexed at all, it wastes the only place a hesitant user goes for detail.
The rewrite inverted the order. The first two lines stated what the app does and for whom, in the words people search with, and the feature list followed in short scannable groups rather than prose. On the Play listing each priority term then appeared three to five times naturally across the body — twice near the top, the rest distributed — which is enough for the index without reading as stuffing to a human.
The App Store version diverged deliberately. With no indexing benefit available, that description was written purely to answer objections: pricing, what the free tier includes, whether files export, and whether it works offline. Those four answers were the ones the review feed showed people asking before they installed.
What to avoid in the body copy
Descriptions fail in predictable ways, most of them inherited from web marketing copy:
- Opening with company mission rather than what the app does.
- Repeating a keyword mechanically until the paragraph stops reading like English — Play's index handles natural repetition and its reviewers flag the rest.
- Long unbroken paragraphs on a surface read almost entirely on a phone.
- Feature names that only make sense to the internal team.
- Competitor brand names, which both stores reject.
- Never updating the description after major releases, so the copy describes a version users no longer download.
Frequently asked questions
Does the Google Play description affect rankings?
Yes. Google Play indexes the title, the 80-character short description and the full 4,000-character description, so keyword placement in all three affects where you rank.
How long should an app description be?
Use the first 250 characters as a complete pitch, then write as much detail as is genuinely useful. On Google Play, longer text gives more indexable surface; on iOS, length has no ranking effect.
What is promotional text used for?
It is a 170-character line above the iOS description that can be updated without submitting a build — ideal for launches, sales and seasonal messaging.
appXL Research
App Store Optimization Research Team
The appXL research team analyzes App Store and Google Play ranking data across the apps our agent manages, and publishes what it finds.