To optimize your App Store subtitle for maximum ASO impact: use keyword-rich phrases instead of taglines, target terms with popularity 30-60 that aren't already in your app name, combine phrases using "&" to maximize keyword coverage within 30 characters, and localize for multiple storefronts where competition is often much lower. The subtitle is the second-strongest ranking signal after the app name — according to Apple's App Store product page documentation, it's one of three metadata fields that directly affect search discoverability.
Your App Store subtitle is the second strongest ranking signal after your app name. That makes it 30 characters of prime keyword real estate. Most developers waste it on a cute tagline that nobody searches for, then wonder why their app sits on page 8.
This guide breaks down how to write a subtitle that actually helps people find your app. If you ship iOS apps and your organic impressions are flat, your subtitle is one of the first things to fix.
Why does the subtitle matter so much for ASO?
Apple indexes three metadata fields for search ranking: your app name, your subtitle, and your keyword field. The app name carries the most weight. The subtitle comes second. The keyword field is third.
That hierarchy means your subtitle punches well above its character count. Thirty characters in the subtitle do more for your search rankings than thirty characters in the keyword field. Apple's algorithm gives extra weight to terms that appear in user-facing metadata, and the subtitle is right there on your product page, visible in search results.
There's a conversion angle too. When someone searches the App Store and sees a list of results, they see your app icon, name, and subtitle. That subtitle is often the deciding factor between a tap and a scroll-past. It tells the searcher, in one glance, whether your app does what they're looking for.
If you haven't done keyword research for your App Store listing yet, start there. You need to know which keywords to put in your subtitle before you can optimize it. But if you already have a keyword list and your subtitle is a vague slogan, keep reading.
What makes a bad subtitle?
The most common subtitle mistake is writing a marketing tagline instead of a keyword-rich description. Taglines are great for billboards. They're terrible for App Store search.
Here are real examples of bad subtitles (names changed, patterns kept):
- "Your Journey Starts Here"
- "Life, Simplified."
- "Do More. Be More."
- "The Smarter Choice"
None of these contain a single searchable term. Nobody types "your journey starts here" into the App Store. These subtitles might sound polished in a pitch deck, but they do zero work for discoverability.
Now compare those with keyword-rich subtitles:
- "Daily Habit & Routine Tracker"
- "Budget Planner & Bill Reminder"
- "Meditation Timer & Sleep Sounds"
- "Running Log & Training Plan"
Every word in these subtitles is something a real person might search for. They describe what the app does using language that matches search queries. They also tell the user, at a glance, exactly what they'll get.
The pattern is clear: describe your app's function using words people search for. Skip the poetry.
This is one of the common ASO mistakes that quietly kill your downloads. A wasted subtitle means you're competing with one hand tied behind your back.
How do you pick keywords for your subtitle?
Start with your keyword research data. You should already have a ranked list of keywords organized by popularity, difficulty, and relevance. If you don't, App Sprint's keyword research tool can generate that data for any App Store keyword in seconds.
From your keyword list, pull out the terms that meet three criteria:
1. High relevance. The keyword must describe a core function of your app. Your subtitle appears on every search result and on your product page. If the keyword doesn't match what your app actually does, you'll get taps from the wrong people (and quick uninstalls).
2. Moderate to high popularity. The subtitle is prime real estate, so don't waste it on a term with a popularity score of 12. Aim for keywords in the 30-60 range. These get meaningful search traffic without being impossibly competitive.
3. Not already in your app name. Apple already indexes your app name. Repeating the same keywords in your subtitle wastes characters. If your app name is "Streaky: Habit Tracker," don't put "habit tracker" in the subtitle too. Use those 30 characters for different keywords that expand your search footprint.
Once you've identified 3-5 candidate keyword phrases, you need to figure out which combination fits the character limit while covering the most search queries.
How do you fit everything in 30 characters?
Thirty characters is tight. You'll need to be strategic about every word.
Combine keywords with shared words. If you want to target "budget planner" and "bill tracker," you can write "Budget Planner & Bill Tracker" (29 characters). The ampersand saves a character compared to "and." Apple treats "&" and "and" the same way for indexing.
Use multi-word phrases that cover multiple queries. "Daily Habit & Routine Builder" covers "daily habit," "habit builder," "routine builder," and "daily routine." Apple indexes individual words from your subtitle, so a phrase like this creates multiple keyword combinations.
Cut filler words. Articles (a, the), prepositions (for, with), and generic modifiers (best, top, great) eat characters without adding search value. "The Best Running App" is 22 characters. "Running Log & GPS Tracker" is 25 characters and covers far more keywords.
Skip your category name. Apple automatically associates your app with its category. If you're in "Health & Fitness," you don't need to burn subtitle characters on "fitness" unless it's part of a specific compound keyword you're targeting.
Test character counts before submitting. It sounds basic, but we've seen developers get rejected because they went one character over. Count carefully. App Store Connect will block you at exactly 30 characters.
Here's a practical formula that works for most apps:
[Primary keyword phrase] & [Secondary keyword phrase]
For example: "Meal Planner & Calorie Counter" (30 characters exactly). This hits "meal planner," "calorie counter," "meal counter," and other combinations Apple might create from individual words.
Should you use your brand name in the subtitle?
Almost never.
Your brand name already appears as the app name (or the first part of it). Putting it in the subtitle is pure waste. Nobody searches for your brand name unless they already know your app, and if they already know it, they'll find it anyway.
The only exception: if your brand name is a searchable keyword. If your app is called "Fasting" and fasting is your primary keyword, then your brand inherently works as a keyword. But for most indie apps with invented names (Streaky, Nomie, Pockity), the brand name has zero search volume.
Use all 30 characters for keywords that bring in new users who don't know you yet. That's the entire point of ASO.
From the trenches
We worked with a developer who had a focus timer app called "ZenWork." Their subtitle was "ZenWork Focus Sessions." That's 22 characters spent on the brand name (which was already the app name) and one keyword phrase.
We changed the subtitle to "Focus Timer & Deep Work Tracker" (31 characters, so we trimmed to "Focus Timer & Deep Work Track" at 29). The result: "focus timer," "deep work," and "deep work tracker" all became new ranking keywords. Within three weeks, impressions for "focus timer" went from not-ranked to position 14, and "deep work" went from nothing to position 9. Daily impressions overall increased from ~80 to ~310.
That's the difference between a subtitle that repeats your brand name and one that expands your keyword coverage.
When should you change your subtitle?
Your subtitle isn't permanent. You can (and should) update it with each app version. Here's when to make changes:
When your keyword data tells you to. If you're tracking keyword rankings and a subtitle keyword has stagnated at position 40+ for three or more weeks, it's not going to break through. Swap it for a different term and test again.
When you spot a better keyword opportunity. Keyword research is ongoing. As you track more keywords and analyze competitors, you'll find terms with better popularity-to-difficulty ratios than what you're currently using. Don't wait for a major update to make the switch.
When seasonal trends apply. If your app is relevant to "new year resolution" in January or "back to school" in August, temporarily adjusting your subtitle to include seasonal keywords can capture short-term traffic spikes. Just remember to switch back after the season passes.
When you pivot or add a major feature. If your meditation app adds sleep stories, your subtitle should reflect that. "Meditation & Sleep Stories" covers both functions and captures a new set of search queries.
When Apple changes the rules. Apple occasionally updates its App Store product page guidelines. If they change how subtitles are indexed or displayed, you need to adapt.
One thing to avoid: changing your subtitle too frequently with too many variables at once. If you swap all your keywords simultaneously, you won't know which change helped and which hurt. Change one phrase at a time when possible, and give each change at least two weeks to show results.
What about localization?
This is where most indie developers leave massive amounts of traffic on the table. Apple lets you localize your app metadata for every App Store region. That means you can have a different subtitle for the US, UK, France, Germany, Japan, and dozens of other markets.
And here's what makes this powerful: in many regions, the keyword competition is a fraction of what it is in the US store. A keyword with a difficulty of 70 in the US might be 15 in Germany. Same keyword, completely different competitive situation.
English-speaking markets first. The US, UK, Australia, and Canada stores all accept English metadata, but search behavior varies. "Colour" vs "color" matters. "Torch" vs "flashlight" matters. British users search for "maths" while American users search for "math." Small differences, but they're free wins if you localize your subtitle for each store.
Non-English markets. If your app works in other languages, translating and localizing your subtitle (not just translating, but researching which keywords people actually search in that language) opens up entirely new audiences. A budget-friendly ASO tool can help you research keywords across multiple storefronts without needing separate tools for each country.
What counts as a "localization." You don't need to translate your entire app. Apple lets you localize just the metadata (name, subtitle, keyword field, description, screenshots) even if the app itself is only in English. This means you can target keywords in Spanish, Portuguese, or German even if your UI stays in English. Whether that's a good user experience depends on your app, but from a pure ASO perspective, it's a valid strategy.
The bottom line: if you only optimize your subtitle for one storefront, you're ignoring the majority of App Store traffic worldwide. Even localizing for just the top 5-10 markets by revenue can double or triple your total impressions.
What to do next
Your subtitle is 30 characters that directly impact whether people find your app. Here are the key takeaways:
- Treat your subtitle as a keyword field, not a tagline. Every character should earn its place through search volume.
- Don't repeat keywords from your app name. Expand your keyword coverage instead.
- Combine keyword phrases using "&" to cover more search queries in fewer characters.
- Test changes one at a time and give each version at least two weeks of data before judging.
- Localize your subtitle for multiple storefronts. The competition is lower and the traffic is real.
If you want to see popularity scores, difficulty ratings, and competitor data for every keyword you're considering for your subtitle, try App Sprint's keyword research tool. It shows you exactly which terms are worth those 30 characters, so you don't waste them on guesswork.
References
- Apple App Store Product Page — Official documentation on subtitle character limits, indexing, and metadata requirements
- App Store Review Guidelines — Apple's rules on subtitle content, including restrictions on generic terms and misleading text
- App Store Connect Help: Localizations — How to localize your subtitle and metadata for different App Store regions
