App Store Optimization for United States: The Complete ASO Guide
Complete ASO guide for the US App Store, the world's largest market. Keyword research strategies, metadata optimization, and competition insights for American users.
The US App Store
The United States is the storefront almost every publisher launches in first, from solo developers to the largest studios. That is what makes it hard: the same keywords are wanted by apps with years of ratings behind them, so the words you pick decide whether a new app shows up at all.
Search is where most downloads start. Apple says nearly 65 percent of App Store downloads come straight from a search, which makes App Store Optimization the channel an indie developer can work on every week without a marketing budget.
Seasonal Trends
The US market follows predictable cycles. Downloads rise over the holidays (November to January) as new devices are set up. Back to school (August and September) lifts education and productivity apps. New Year's resolutions bring a January surge for health, fitness and habit tracking. Updating your metadata a few weeks ahead of each cycle beats setting keywords once and leaving them.
Language and Localization
The US storefront uses American English (locale code en-US), and the details matter for keyword research:
- Spelling: American English writes "color", "organize" and "canceled". Metadata written with British spellings matches the British words, not the ones US users type.
- Vocabulary: Americans search for "flashlight", not "torch", and "cell phone", not "mobile". Both kinds of difference shape the long tail you can reach.
- Spanish: more than 40 million people in the US speak Spanish at home, and Apple lets the US storefront carry a Spanish (Mexico) localization next to the English one. A Spanish localization gives you a second keyword set in the same store. The table below includes two Spanish searches, "aprender ingles" and "presupuesto", measured in the US store.
How Hard US Keywords Are
Rather than describe the competition, here it is: a cross-section of US keywords from the categories indie developers ship in most, from broad head terms to specific long-tail phrases.
24 app keywords, measured in the US App Store
Measured by RespectASO on 6 October 2026. Popularity is RespectASO's estimate of how often a keyword is searched compared with others, from 1 to 100. Difficulty, from 1 to 100, says how hard the apps already on top are to pass. "In top 10 names" counts the top ten apps with the keyword in their name. How the numbers work.
| Keyword | Popularity | Difficulty | In top 10 names |
|---|---|---|---|
| Head terms | |||
| photo editor | 71 | 87 Very Hard | 8 of 10 |
| fitness app | 62 | 74 Hard | 2 of 10 |
| budget tracker | 44 | 67 Hard | 1 of 10 |
| finance app | 57 | 62 Hard | 0 of 10 |
| game | 76 | 70 Hard | 2 of 10 |
| to do list | 58 | 77 Very Hard | 5 of 10 |
| Features and sub-genres | |||
| habit tracker | 59 | 74 Hard | 8 of 10 |
| calorie counter | 68 | 80 Very Hard | 8 of 10 |
| expense tracker | 43 | 66 Hard | 1 of 10 |
| puzzle game | 66 | 79 Very Hard | 1 of 10 |
| learn spanish | 65 | 77 Very Hard | 3 of 10 |
| home workout | 63 | 75 Hard | 5 of 10 |
| Audiences and uses | |||
| flashlight | 62 | 70 Hard | 9 of 10 |
| color palette | 43 | 42 Moderate | 4 of 10 |
| closet organizer | 39 | 40 Moderate | 2 of 10 |
| white noise | 61 | 74 Hard | 7 of 10 |
| aprender ingles | 54 | 50 Moderate | 0 of 10 |
| presupuesto | 41 | 36 Moderate | 1 of 10 |
| Long-tail phrases | |||
| workout plan for beginners | 32 | 43 Moderate | 0 of 10 |
| budget and expense tracker | 32 | 49 Moderate | 0 of 10 |
| word puzzle game free | 37 | 45 Moderate | 0 of 10 |
| spanish lessons for beginners | 41 | 37 Moderate | 1 of 10 |
| daily schedule planner | 46 | 53 Moderate | 1 of 10 |
| white noise for sleep | 34 | 58 Hard | 0 of 10 |
Difficulty here runs from 36 for "presupuesto" to 87 for "photo editor". 11 of the 24 keywords score 70 or more, and none score under 30. The long-tail phrases have a median difficulty of 47, against 72 for the head terms. The highest popularity among keywords under difficulty 50 belongs to "color palette": 43, at difficulty 42.
To see what these keywords would bring your own app, and to measure them in any of the 175 storefronts, run them in RespectASO, free on your Mac.
Read the head terms against the long-tail phrases: the reading under the table compares their median difficulty. Broad terms like "photo editor" and "fitness app" are the ones every large app wants, so check their difficulty before you build a title around one. Look at the last column too: when most of the top ten carry the keyword in their name, you are up against apps built around that exact phrase.
Keyword Research Strategies for the US Market
1. Think in Problem and Solution Pairs
American users search with clear intent. Describe the problem your app solves rather than its category: a budgeting app is found through "budget tracker" more than through "finance app". Both are in the table above, so you can see how differently they compete.
2. Compare Candidates Side by Side
Judge popularity and difficulty together, never one alone: a keyword people search for is only worth the space if your app can reach a rank that brings downloads. RespectASO scores a whole list at once and turns each pair into one Opportunity number for your app.
3. Look for Sweet Spots and Hidden Gems
Sweet Spot keywords bring real downloads at the rank your app can expect, and they are rare in the US. Hidden gems trade some volume for a difficulty low enough that a new app lands far higher. Both are where a young app can rank without a large download base.
4. Watch Your Competitors' Keywords
Use RespectASO's competitor analysis to see which keywords the apps you compete with target. In a crowded store, a phrase a competitor overlooked can be the difference between page one and page five.
Metadata Optimization for the US Store
Three fields count for search: the title (30 characters), the subtitle (30 characters) and the hidden keyword field (100 characters).
Title Strategy
The title carries the most weight. Put your brand and your most valuable keyword there. Clarity beats cleverness: "SleepWave: White Noise Sounds" tells search what the app is; "SleepWave: Your Sleep Companion" does not.
Subtitle Strategy
Use the subtitle for your second keyword phrase. Do not repeat words from the title: Apple reads the fields together, so a repeat only spends characters.
Keyword Field Strategy
Fill the 100 characters with single words and short phrases separated by commas, none of them already in the title or subtitle: long-tail variations, common misspellings and synonyms. Every character you save fits another keyword.
Common Mistakes in the US Market
- Chasing only the biggest keywords. The broadest terms are where established apps hold the top results. Start with the specific phrases and work up as your app gains ratings.
- Treating the keyword field as an afterthought. Those 100 characters are the cheapest ranking surface you have.
- Keeping British spellings. If you started in the UK, check every keyword for its American spelling before you ship the US metadata.
- Never updating. Competitors arrive on keywords that were quiet six months ago. Review your metadata at least every quarter.
- Forgetting the other English markets. The United Kingdom, Canada and Australia share the language but not the competition, so the same keyword can be worth more in one of them than in the US.
How RespectASO Helps in the US Market
RespectASO scores any list of keywords for your own app: popularity, difficulty, the Opportunity they bring at the rank your app can expect, and an Insight tag that says what to do with each. The Country Opportunity Finder runs one keyword through the storefronts you pick, which shows when a keyword that is out of reach in the US is worth taking in Brazil or Germany.
It runs on your Mac and keeps your keyword research there, where we never see it.
RespectASO's Country Opportunity Finder ranks the storefronts you pick for any keyword
Find the Best Keywords for United States
See which keywords your app can win in the United States App Store: RespectASO scores the popularity and difficulty of any keyword there, free on your Mac.