How to Write an App Store Description That Converts

Here’s the thing most ASO guides bury: on Apple’s App Store, your description has almost zero effect on where you rank in search. Apple pulls keywords from your app name, subtitle, and the hidden 100-character keyword field. The description? Not indexed. So stuffing it with keywords is wasted effort.

What the description does brilliantly is convert. Someone taps your listing, skims your screenshots, and then reads (at most) the first three lines of text before deciding whether your app is worth 80 MB of their storage. Those three lines are some of the highest-leverage copy you’ll ever write.

We’ve rewritten descriptions for a handful of indie apps we’ve shipped through App Store Connect, and the pattern is always the same: lead with the outcome, cut the fluff, and format for skimmers. Here’s the full playbook.

Promotional Text vs. Description: Know Your Two Fields

Apple gives you two separate text blocks on your product page, and people mix them up constantly.

Field	Limit	Where it shows	Can you edit without app review?
Promotional text	170 characters	Above the description, below screenshots	Yes, updates in minutes
Description	4,000 characters	Below promotional text, truncated after ~3 lines	No, requires a new version submission

That editability difference matters more than the character counts. Promotional text is the only copy on your page you can change on a Tuesday afternoon and see live by dinner. Use it for time-sensitive stuff: a sale, a seasonal feature, a big update, an award you just won. Never waste it repeating your subtitle.

The description, on the other hand, is locked to your binary. If you spot a typo, you’re waiting for your next release to fix it. So write it once, write it well, and proofread it twice.

The First Three Lines Are 80% of the Job

On an iPhone, users see roughly the first three lines of your description before the “more” link cuts it off. Most people never tap “more”. So treat those lines like a movie trailer, not an opening chapter.

A formula that works:

1. Line 1: The outcome your app delivers, in plain words. Not what it is, what it does for them.
2. Line 2: The mechanism or differentiator. Why you, not the other 40 apps in the results.
3. Line 3: Proof or a credibility hook. Users, ratings, press, an award.

Compare “TaskFlow is a productivity application with task management features” against “Get through your to-do list by lunch. TaskFlow turns your chaotic day into three focused blocks, and over 2 million people plan with it daily.” Same app, wildly different pull.

Write Benefits, Then Back Them With Features

Nobody downloads a “cloud-synced note repository”. They download “your notes, on every device, before you’ve even put your Mac to sleep”. The trick is to lead every section with the benefit and let the feature ride along as evidence.

• Weak: “Supports offline mode.” Better: “Works on the subway. Everything syncs when you’re back online.”
• Weak: “AI-powered transcription.” Better: “Talk instead of type. Your rambling voice memo becomes a clean note in seconds.”
• Weak: “Customizable widgets.” Better: “See your day at a glance without opening the app.”

A good gut check: read each line and ask “so what?” If the line doesn’t answer it, rewrite it until it does.

Formatting That Survives the App Store

Here’s where a lot of carefully crafted descriptions fall apart: the App Store renders plain text only. No markdown, no bold, no links, no HTML. Paste in asterisks for emphasis and users see literal asterisks.

What you can (and should) use:

• Short paragraphs. Two or three sentences, then a line break. Walls of text kill skimmers.
• ALL CAPS section headers. It’s the only “heading” you get. “WHY PEOPLE LOVE TASKFLOW” reads fine in context.
• Simple bullet characters. A hyphen or a bullet dot at the start of a line. Test them on a real device, some special characters render inconsistently.
• Blank lines between sections. Whitespace is your only design tool here. Spend it generously.

One more gotcha: emoji technically work, but Apple has rejected listings for excessive or misleading use. A couple of tasteful ones as bullet markers is usually fine. A confetti cannon in every line is asking for a review delay.

Social Proof: Borrow Trust You Haven’t Earned Yet

A stranger’s claim about their own app is worth little. A number or a third-party quote is worth a lot. Weave proof into the description wherever it’s honest:

• User counts (“trusted by 500,000 students”)
• Ratings (“4.8 stars from 12,000 reviews”)
• Press mentions (“featured by Apple in Apps We Love”)
• Concrete results (“the average user clears 30% more tasks in week one”)

Round honestly and keep it current. “Over 1 million downloads” ages fine; “1,043,207 downloads” looks weird in six months.

A Before and After Rewrite

Before:

“PhotoVault Pro is an innovative photo management solution that leverages cutting-edge technology to help users organize, edit and secure their photos. With a wide range of powerful features, PhotoVault Pro is the ultimate app for all your photo needs.”

Fifty words, zero information. Every app on the store could paste this in and nothing would change.

After:

“Your camera roll is a mess. PhotoVault fixes it in one evening.

Duplicates get found automatically, 10,000 photos get sorted into albums by face and place, and your private stuff goes behind Face ID. 4.8 stars from 22,000 people who finally found that one photo from 2019.

WHAT YOU CAN DO
– Free up gigabytes by removing duplicates and blurry shots
– Lock private albums behind Face ID
– Search by person, place, or thing”

Notice what changed: a named problem, a concrete promise, real numbers, and formatting a skimmer can process in five seconds.

Localize the Description (Not Just the App)

If your app supports multiple storefronts, a machine-translated description is a conversion leak. Apple lets you localize every text field per territory, and localized product pages consistently convert better because they read like they were written for that market, idioms and all.

Prioritize your top three revenue territories first, and remember that localizing metadata also unlocks extra keyword coverage. We cover the keyword side of that in our ASO keyword research guide, because it pairs naturally with description localization.

Testing: What You Can and Can’t A/B Test

Apple’s built-in A/B tool, Product Page Optimization, tests icons, screenshots, and app previews against your default page. Here’s the catch: it does not test description text. Text metadata still ships with a version submission.

So how do you test copy? Three practical routes:

1. Promotional text swaps. Change it weekly, watch your conversion rate in App Store Connect analytics. It’s crude (no control group) but free and fast.
2. Custom product pages. You can run up to 70 of them, each with its own promotional text and screenshots, pointed at different ad audiences. Different copy for different traffic, with real per-page metrics.
3. Iterate per release. Ship a description change with a version, compare conversion over the following two weeks against the prior baseline. Slow, but it compounds.

Whatever you test, change one thing at a time. If you swap the opening line and the social proof in the same release, you’ll never know which one moved the needle.

Where This Fits in Your ASO Stack

A great description won’t rescue a page that never gets found. Ranking on Apple’s store comes from your title, subtitle, keyword field, ratings, and download velocity, all covered in our breakdown of Apple’s ASO ranking factors. And if you’re starting from zero, begin with the fundamentals in our complete ASO guide, then come back here once traffic is landing on your page.

Think of it as a funnel: keywords get you seen, screenshots get you considered, and the description closes the deal.

FAQ

Does the App Store description affect keyword rankings?

On Apple’s App Store, no. Rankings come from your app name, subtitle, and keyword field. On Google Play the description IS indexed, which is why Android listings read more keyword-dense. Write your iOS description purely for humans.

How long should an App Store description be?

You get 4,000 characters, but you don’t need them all. Around 1,500 to 2,500 characters with clear sections works well. The first three lines matter far more than the total length.

Can I use emoji and formatting in my description?

Plain text only: no bold, links, or markdown. Line breaks, ALL CAPS headers, and simple bullets are your formatting toolkit. Light emoji use is generally fine; heavy or misleading use can trip up app review.

How often can I change my description?

The description only updates with a new version submission. Promotional text (the 170-character field above it) can be changed anytime without review, so use that field for anything time-sensitive.