Nobody reads your app description. Google does.

Developers agonize over the description field like it's the landing page of the listing. Here's the uncomfortable split: on Apple's store, the search algorithm never reads it — and on Google Play, the algorithm is its most important reader. Same field, two completely different games. Most listings play the wrong one on both stores.

Two stores, two readers

Apple's App Store search doesn't index your description. It ranks you on your app name, your subtitle, and the hidden 100-character keyword field — the one most developers throw away. Stuffing "meditation sleep relax calm" into your Apple description does exactly nothing for search. The description exists for one reader only: the human who already opened your listing and is deciding whether to tap Get.

Google Play is the mirror image. There is no keyword field at all. Search ranking is pulled from your listing text itself — the 30-character title, the 80-character short description, and the long description. On Google, the description is your keyword field, hiding in plain sight at 4,000 characters.

That one asymmetry should change how you spend your writing time. On Apple: put the keyword effort into the name, subtitle, and keyword field, and make the description pure persuasion. On Google: the description carries both jobs at once, and you have to write it that way.

On Apple, it's sales copy — nothing else

Once you accept that Apple's algorithm ignores it, the description gets simpler and better. No keyword gymnastics, no awkward "best todo list task manager planner app" sentences. Just answer the only question the reader has: what does this do for me?

One constraint makes it higher-stakes than it looks: on Apple, changing the description requires submitting a new version of the app. It ships with the binary and then it's frozen until your next release. Write it like something that has to survive a few months, not something you'll tweak on Tuesday.

On Google, the description is the keyword field

Google Play reads your description the way old-school web SEO read a page: the terms you use, where you use them, and how often. The practical playbook:

Pick a handful of target phrases — the real-language queries someone types when they have the problem your app solves. "Habit tracker," "split bills with roommates," "scan receipts." Not ten phrases; three to five.

Use each one naturally a few times — in the first paragraph, in a feature bullet, near the end. Written prose that a human would happily read, with your target phrases occurring where they'd occur anyway. That's the whole trick.

Don't stuff. Google Play's metadata policy explicitly prohibits repetitive and irrelevant keyword use, and listings get rejected for it. A wall of comma-separated keywords doesn't just read as spam to users — it's a policy violation that can take your update down with it.

And give the 80-character short description real attention. It's indexed, and it's the text shown on your listing before anyone taps "read more" — the highest-visibility sentence you get on Google Play. A generic "The best way to manage your life!" wastes both jobs at once.

The fold decides what actually gets read

On both stores, the listing shows only the first few lines of your description before hiding the rest behind a "more" link — and almost nobody taps it. Whatever you need the reader to know has to happen in the first sentence or two.

Which is why the classic openers are silent killers. "Welcome to Acme, the app that reimagines productivity" spends the only guaranteed-visible line saying nothing. So does opening with a press quote, a version announcement, or your company's mission. The first line should be your pitch, stated plainly: who it's for, what it does, why it's better. If your first line works as the answer to "what is this app?", you've written it correctly.

The field everyone forgets: promotional text

Apple gives you one escape hatch from the frozen-description problem: promotional text, 170 characters that appear above the description — and that you can change any time without shipping a new build. It's the only listing copy on Apple you can update on a whim, and most listings either leave it empty or set it once at launch and forget it exists.

Use it for the things a frozen description can't do: the feature you shipped last week, a seasonal hook, the limited-time discount. When the description can't move, this is the part that can.

Write it once, spend the effort where it counts

The efficient workflow falls out of the asymmetry. Write one great description with your Google target phrases woven in naturally — since Apple's algorithm ignores the field anyway, the same text works fine there; keyword-bearing prose doesn't hurt human readers when it's written like prose. Then spend the Apple-specific effort where Apple actually looks: name, subtitle, keyword field, promotional text.

Or let the AI write both versions

ShotCanvas generates store metadata that respects this split: descriptions written to convert, an Apple keyword field built from real search phrases, short descriptions that do their double duty, and promotional text you can refresh in seconds — then publishes it all straight to App Store Connect and Google Play. The free tier covers your first listing, no credit card.