Your app description has one job on the App Store and a different job on Google Play, and most developers write the same copy for both. That single mistake wastes either your keywords or your conversion, depending on which store you copied from.
This guide covers the limits, the structure, and the store-specific rules, with worked examples you can pattern-match against. It's short because descriptions should be too.
The two stores play different games
Here's the fact that should shape everything you write:
- Google Play indexes your description for search. The words in your short and full description directly affect which searches your app appears in. Your target keywords belong in this copy, used naturally.
- The Apple App Store does not index your description. iOS search reads your title, subtitle, and the 100-character keyword field. The description exists purely to convert the human who's already looking at your page.
So the Play description is written for two readers, the algorithm and the human, while the iOS description is written for exactly one. Same app, different copy. If you remember nothing else from this page, remember that.
The exact limits (both stores)
- Description: 4,000 characters on both the App Store and Google Play.
- Google Play short description: 80 characters, shown at the top of your listing and weighted heavily for search. It's the most valuable copy real estate on Android.
- Apple promotional text: 170 characters, shown above the description and updatable anytime without submitting a new version. Use it for launches, sales, and seasonal hooks.
- The fold comes fast. Both stores truncate the description after roughly three lines behind a "more" or "read more" tap, and most users never tap it.
That last number is the one that matters. You get about 250 characters of guaranteed reading. Spend them like they're all you have, because they usually are.
The structure that works
Nobody reads a store description top to bottom; people sample the opening and skim the middle. Structure for that reality:
- Lines 1–3: the outcome. Not your app's name (it's right there), not "welcome to." State the single biggest thing the user gets, in their words. This is what shows before the fold.
- One short paragraph of how. The mechanism that makes the outcome believable: what it does, for whom, in plain language.
- A scannable feature list. Five to eight bullets, each starting with the benefit, not the feature name. Skimmers land here after the opening hooks them.
- Social proof. A rating, a press quote, a user count. One or two lines: it's a credibility checkpoint, not a trophy cabinet.
- A closing nudge plus support contact. People who reach the end are ready; tell them what to do, and show them a human is reachable when something breaks.
Before and after: a worked example
A description opening the way most indie apps actually open:
- Before: "Welcome to BudgetBee! BudgetBee is a personal finance application designed to help you manage your finances. With many powerful features, BudgetBee makes budgeting easy and convenient for everyone."
Sixty words in and the reader knows nothing. Now the same app, rewritten to lead with the outcome:
- After: "See where your money went, in 30 seconds a day. BudgetBee turns your spending into one simple daily check-in: no spreadsheets, no bank anxiety, no finance degree required. Built for people who've quit three budgeting apps already."
Same app, same features. The second one survives the fold. Notice it also names its person ("people who've quit three budgeting apps"), which converts far better than "everyone", because nobody self-identifies as everyone.
For an Android version of that copy, you'd weave in search phrases the way you'd say them out loud: "budget planner," "expense tracker," "spending tracker" each appearing once or twice where they fit naturally. On iOS you'd skip that entirely and spend the space selling, because Apple isn't reading.
Google Play: keywords without the penalty
Since Play indexes your description, there's a temptation to stuff it. Resist. Google's spam policies explicitly flag keyword-stuffed descriptions, and a listing that reads like a keyword salad converts worse even when it ranks.
The rules that keep you safe and effective:
- Use your primary keyword in the short description (that 80-character line is heavily weighted) and two or three times in the full description.
- Use secondary keywords once or twice each, only where a human would naturally write them.
- Never list keywords comma-separated in the copy. That's the pattern Google's spam detection exists to catch.
- Read it aloud. If a sentence exists only to hold a keyword, cut it or rewrite it. Ranking for a term with copy that repels humans is a net loss.
Common mistakes
- Writing one description for both stores. iOS copy full of woven keywords wastes conversion space; Play copy with zero keywords wastes ranking.
- Opening with the app's name or "Welcome to." The name is already on screen. You're burning fold space on redundancy.
- Features without outcomes. "Cloud sync" is a feature. "Your notes on every device, even when you switch phones" is why anyone cares.
- Ignoring the promotional text on iOS. It's 170 characters you can change without review: free space for launches and seasonal pushes that almost every indie leaves blank.
- Shipping without checking. Truncated sentences, missing keywords, and weak openings are all visible in ten seconds with a free audit, before the store review cycle makes fixing them slow.
Write it, then check it
If you'd rather start from a working draft than a blank page, ReachFront's free generators produce a complete listing inside the exact limits for each store: the App Store description generator writes your iOS title, subtitle, keyword field, and description together, and the Google Play description generator handles the 30-character title, 80-character short description, and 4,000-character long description with your target keyword placed where Play actually reads it.
Already have a listing? Paste your store URL into the free App Store ASO checker or Google Play ASO checker and you'll get a 0–100 score with the specific fixes ranked by impact: no sign-up, and it catches the description problems this guide covers automatically.
Frequently asked questions
What is the character limit for an app description?
Both the Apple App Store and Google Play allow up to 4,000 characters for the main description. Google Play adds an 80-character short description shown at the top of your listing, and Apple adds 170 characters of promotional text that you can update without a new app version.
Does the app description affect ASO?
On Google Play, yes, directly: Google indexes your short and full descriptions for search ranking, so your target keywords belong there. On the Apple App Store, the description is not indexed for search at all, so it affects ASO only indirectly, by convincing more of the people who found you to install, which improves your conversion signals.
How long should an app description be?
Long enough to land one clear benefit, a scannable feature list, and a piece of social proof, which is usually 1,500–2,500 characters of the 4,000 you're allowed. The first three lines matter more than the other 3,900 characters combined, because that's all users see before tapping "more".
Can I use AI to write my app description?
Yes, and most developers now do, but edit the output. Generic AI copy reads generic, and Google's policies penalize keyword-stuffed spam regardless of who wrote it. Purpose-built tools help because they enforce the store's exact character limits and keyword placement rules, then you make it sound like your app.
Next steps
The description is one piece of the listing: the full ASO guide covers how it fits with your title, keywords, and visuals, and keyword research tells you which terms your Play description should carry. When the words are done, your screenshots take over the selling.