App Store Optimization starts with keywords. Not just any keywords — the specific terms your ideal users type when they're looking for exactly what you've built. Get this right and discovery becomes a predictable growth channel. Get it wrong and you're burning ad spend to compensate for organic traffic you should be earning for free.
How App Store Search Actually Works
The App Store search algorithm matches user queries against the text in your app's metadata — primarily the title, subtitle, and keywords field on iOS, and the title, short description, and long description on Android. It also considers behavioral signals like click-through rate and conversion rate for those queries.
This matters because a keyword that drives 10,000 searches per month is worthless if users searching that term download apps similar to yours at a 5% rate and your listing at 0.3%. Relevance and conversion both count.
Start with Your Users, Not a Keyword Tool
Before opening any tool, write down how your users describe the problem your app solves — in their own words. Not your marketing language. Not your feature names. The actual phrases they'd type into a search bar at 11pm when they're frustrated and looking for a solution.
If you have existing users, ask them directly: "How did you find this app? What would you have searched for?" Their answers are often more valuable than thousands of data points from any tool.
Finding Keywords with Real Volume
- App store autocomplete: type your seed keyword and note every suggestion that appears — these are real queries with real volume
- Competitor metadata: find 3–5 apps that compete for your user and examine their title, subtitle, and visible keyword signals
- App store review mining: the words users use in reviews often become their search terms — search for your category and read through reviews
- Google Keyword Planner: web search volume correlates imperfectly but usefully with app search intent
- Dedicated ASO tools: Sensor Tower, AppFollow, and AppTweak provide volume estimates and difficulty scores for iOS and Android
Long-Tail vs Short-Tail: The Real Trade-Off
Short-tail keywords ("photo editor", "fitness tracker") have massive volume but brutal competition. Unless you're a top-100 app by downloads and ratings, you won't rank for them. Don't waste your limited keyword real estate chasing terms you can't win.
Long-tail keywords ("photo editor for instagram reels", "fitness tracker no subscription") have lower volume but are far more achievable. And they often convert better — someone searching a specific phrase knows exactly what they want.
A #1 ranking for a 500 searches/month keyword beats a #47 ranking for a 50,000 searches/month keyword every time.
Where to Place Keywords
On iOS, your title carries the most weight, followed by the subtitle, then the keywords field (100 characters). Don't repeat words across fields — each character should be working on a different term. Commas separate keywords; no spaces needed.
On Google Play, the algorithm indexes your entire long description (up to 4,000 characters). Each target keyword should appear 2–4 times naturally across your description. Keyword stuffing gets detected and suppressed.
Measuring and Iterating
Keyword rankings shift. A term that was low competition six months ago may now be crowded. Check your ranking positions monthly, track which keywords are actually driving impressions and downloads in your analytics, and replace underperforming terms with fresh candidates. ASO is never done — it's a maintenance practice.