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Keyword Research: The Complete Resource Guide
Everything you need to know about iOS App Store keyword research. Guides, glossary, tools, and strategies for finding the best keywords for your app.
Keyword research is the foundation of App Store Optimization. Before you write a single line of metadata, you need to understand what people are searching for, how competitive those searches are, and where your app has the best chance of ranking. This guide connects every keyword research resource on RespectASO into one place.
What Is iOS Keyword Research?
App Store Optimization starts with understanding search behavior. When someone types "meditation timer" or "budget tracker" into the App Store search bar, the App Store search algorithm decides which apps to show. Keyword research is the process of finding which search terms are worth targeting — and which ones aren't.
Effective keyword research answers three questions:
- What are people searching for? Understanding keyword popularity tells you whether a term has enough search volume to matter.
- How hard is it to rank? Keyword difficulty measures how many strong competitors already target that term.
- Where's my best opportunity? The opportunity score combines popularity and difficulty to identify keywords where the effort-to-reward ratio is favorable.
Core Concepts
Popularity and Difficulty
Every keyword has two fundamental metrics. Popularity measures search volume on a scale of 1–100 — a score of 50+ indicates high demand, while below 15 means very few people are searching for that term. Difficulty measures competition on the same scale — scores below 35 are achievable for most apps, while above 75 means you're competing against well-established players.
RespectASO derives these scores from real App Store data, analyzing the competitive landscape around each keyword to produce actionable metrics rather than abstract estimates.
Opportunity Score
The opportunity score is where popularity and difficulty come together into a single action-oriented number. Keywords with high popularity and low difficulty get high opportunity scores. Keywords where competition overwhelms demand get low scores. This is the metric you should sort by when deciding which keywords to target first.
Keyword Classifications
Not all keywords are equal. RespectASO classifies keywords into actionable categories so you can make decisions at a glance:
- Sweet Spot: High popularity with low difficulty — the ideal targets. These are rare but enormously valuable when you find them.
- Hidden Gem: Moderate popularity with very low difficulty and good opportunity — keywords your competitors are overlooking.
- Long-tail Keywords: More specific, lower-volume phrases that are easier to rank for. Individually small, they can collectively drive significant traffic.
Your App Store Metadata
Once you've identified your target keywords, they need to go into the right places. Apple gives you 160 characters of indexable metadata:
- App Title: 30 characters. Carries the most weight in search ranking. Put your strongest keyword here alongside your app name.
- Subtitle: 30 characters. Visible in search results. Use it for a secondary keyword phrase that also communicates your app's value.
- Keyword Field: 100 characters. Hidden from users but indexed by Apple. Comma-separated keywords — no spaces after commas, no duplicates of words already in your title or subtitle.
The art of ASO is fitting the best possible keywords into these tight character limits. Every character matters.
Research Strategies
Start With Your Niche
Begin with the obvious terms that describe your app. Search for them in RespectASO to see their popularity and difficulty scores. Then explore related terms — synonyms, features, use cases, and problems your app solves. A fitness app shouldn't just target "fitness tracker" — it should explore "step counter," "workout log," "calorie tracker," and dozens of variations.
Analyze Your Competitors
Competitor analysis reveals which keywords are working for similar apps. Looking at the top-ranking apps for your target keywords shows you what metadata strategies are succeeding in your category. RespectASO's competitor analysis features show you which keywords your competitors rank for and where gaps exist.
Think Multi-Market
The same keyword can have completely different popularity and difficulty profiles across countries. A term that's highly competitive in the United States might be wide open in Brazil or South Korea. The Country Opportunity Finder scans all 30 supported markets to find where your keywords have the best opportunity — you might discover untapped markets you never considered.
Iterate and Refine
Keyword research isn't a one-time task. The App Store evolves — new competitors appear, search trends shift with seasons, and Apple's algorithm updates change the landscape. Revisit your keyword strategy regularly, track your search visibility, and test new keywords in your keyword field to continuously improve your rankings.
Keyword Research by Category
Keyword strategy varies significantly by app category. A game has different keyword dynamics than a finance app. Browse our category-specific ASO guides for tailored keyword strategies:
High-Competition Categories
- Games — The largest and most competitive category. Long-tail and genre-specific keywords are essential.
- Social Networking — Dominated by major players. Focus on niche features and specific use cases.
- Photo & Video — Saturated but with constant demand. Target specific editing features and styles.
- Entertainment — Broad category where specificity wins.
Strong Opportunity Categories
- Health & Fitness — Growing demand with room for specialized apps.
- Productivity — Users search for specific solutions; keyword specificity pays off.
- Education — Diverse sub-niches with distinct keyword patterns.
- Finance — High-value users with specific search intent.
Niche Categories
- Weather — Smaller but with highly targeted searches.
- Food & Drink — Location and cuisine keywords matter.
- Travel — Seasonal and destination-driven keyword patterns.
- Music, News, Sports — Category-specific terminology and seasonal trends.
See all category guides →
Keyword Glossary
Understanding the terminology is essential. Here are the key terms every indie developer should know:
| Term | What It Means |
|---|---|
| Keyword Popularity | How many people search for a term (1–100 scale) |
| Keyword Difficulty | How hard it is to rank for a term (1–100 scale) |
| Opportunity Score | Combined metric balancing popularity against difficulty |
| Sweet Spot Keywords | High popularity + low difficulty — ideal targets |
| Hidden Gem Keywords | Moderate popularity + very low difficulty — overlooked opportunities |
| Long-Tail Keywords | Specific, lower-volume phrases that are easier to rank for |
| Keyword Density | How often a keyword appears relative to total content |
| Search Visibility | How often your app appears in search results |
| Brand Keywords | Searches for a specific app or company name |
See the full ASO glossary →
Further Reading
- iOS App Keyword Research Strategy — Step-by-step guide to building your keyword list
- What Is App Store Optimization? — Complete beginner's guide to ASO
- Why Is My App Not Ranking? — Diagnostic guide for ranking problems
- Keyword Research Documentation — How to use RespectASO's keyword research features
- Scoring Methodology — How popularity, difficulty, and opportunity scores are calculated
- App Store Localization Guide — Taking your keyword strategy global across 30 markets
- AI-Powered ASO Guide — Using AI for automated keyword research and competitor analysis
RespectASO's keyword research dashboard with scoring guide and targeting advice
Put this strategy into practice
Download the macOS app and turn the guide into keyword research, market scanning, and competitor checks.