Most App Store descriptions are written once, at launch, by the developer who built the app. That description then sits unchanged for months or years while everything around it evolves: the app gets better, the user base grows, competitors sharpen their messaging, and the search landscape shifts.
This guide is about writing a description that works, and knowing when to update it.
What the App Store description actually does
Before writing anything, understand what the description is and is not doing.
The description is indexed by Apple for search but carries less weight than your title, subtitle, and keyword field. Changing your description won’t directly move keyword rankings the way changing your title will.
What the description does affect:
- Conversion on your product page: Users who tap your icon or click a search result land on your page. The first three lines of your description (visible without tapping “more”) are part of what they decide on.
- Context after screenshots: Users who have been convinced by your visuals sometimes read the description to confirm the decision. It removes doubt.
- Store review and editorial consideration: Apple’s editorial team reads descriptions when considering apps for feature placements.
The description’s job is not to drive discovery. Its job is to convert users who are already looking at your page.
Structure: first three lines are everything
The iOS App Store shows approximately three lines of your description before truncating with a “more” link. On a standard screen, that’s roughly 160 to 200 characters.
Those three lines are your only guaranteed impression on most users. They need to answer:
- What does this app do?
- Who is it for?
- Why is it better or different?
In that order. No clever copy. No vague claims. No “the #1 app for…”
A strong opening looks like this:
Marteso tracks your App Store keyword rankings in real time. Built for indie iOS developers who want to grow organic downloads without guessing which keywords are working.
That’s 177 characters. It answers all three questions. A developer landing on this page immediately knows whether to keep reading.
Step 1: Write the one-sentence version first
Before writing anything long, answer this question in one sentence: what does your app do, for whom, and to what end?
This forces clarity. If you can’t answer it in one sentence, you don’t have a sharp enough value proposition yet. That’s useful information: it means you need to sharpen the positioning before writing any copy.
The one-sentence version becomes your first line.
Step 2: List your three strongest features or outcomes
After the hook, the next section of your description should cover the features or outcomes that matter most to your target user.
Do not list everything. List the three things that would make someone download your app who has never heard of it.
Format them as short, scannable statements. Users skim. Dense paragraphs don’t convert. A good pattern:
Track keyword rankings across all App Store markets. See where your app ranks for every term in your metadata. Watch rank movement over time and catch drops before they affect downloads.
Three things. Each one a benefit statement, not a feature label.
Step 3: Address the most common doubt
Every category has a specific objection that shows up before a user downloads. For a keyword tracker, it’s usually: “is this data accurate, or is it just another tool showing me estimates?”
Address it directly. Not defensively, but preemptively.
Marteso updates keyword positions daily using live App Store data, not estimates or historical averages.
One sentence. It removes a doubt that would otherwise cost you a conversion.
To know what doubt to address, look at your one-star reviews. The most common complaint in one-star reviews is usually the doubt your unconverted users already have.
Step 4: End with a low-friction call to action
The final paragraph of your description should make it easy to move. Not pushy. Not full of exclamation points. Just a clear next step.
Available on iOS. Free to start, no credit card required.
Or, for a paid app:
One-time purchase. Works offline. No subscription.
You are telling the user: here is what commitment looks like, and it is not a big one. That framing reduces hesitation.
Common mistakes that kill conversions
Writing for keyword stuffing: The description is not a high-leverage place to add keywords. Loading it with terms like “best app store optimization ASO keyword tracker for indie iOS developers” reads badly and doesn’t move rankings. You have a 100-character keyword field for targeting. The description is for humans.
Passive or vague language: “Marteso helps you understand your keywords better” is less effective than “Marteso shows you exactly which keywords are driving your downloads.” Specific beats vague every time.
Copying your screenshots: Screenshots already tell the visual story. The description should add context that screenshots can’t: who is this for, what outcome should they expect, what is the pricing model.
Not updating after launch: Your app improves. Your user base becomes clearer. New objections emerge from support conversations. A description written at launch becomes outdated fast. Review it every two to three months and ask: does this still reflect what the app does and who it’s for?
How to test what’s working
The App Store does not give you conversion rate by description text the way a website A/B test would. But you can proxy it.
Track your product page views and conversion rate (available in App Store Connect analytics) over time. When you update your description, note the date. If conversion rate changes meaningfully in the following two weeks, the change worked or didn’t.
This is not a controlled experiment, but it’s better than guessing. Over time, you build a picture of which changes move conversion and which don’t.
What to do next
If your current description was written at launch and never touched, start with the one-sentence test. Write it for your app right now. If it’s hard to write, that’s the problem to fix first.
If your description is clear but not converting, look at your one-star reviews for the objection you’re not addressing. Add a single sentence that speaks to it directly. That’s often the fastest conversion improvement available to you.
The description won’t fix weak screenshots or a bad app. But when the rest of your page is strong, a tight description closes the gap between interest and download.