I kept picking app keywords that were either totally saturated or had no real demand. Wasted months building things nobody searched for. ASO Market Finder lets you type in any keyword and instantly see what's actually on Google Play — competition level, demand signals, naming gaps, and a 0–100 Market Opportunity Score across 23 countries. It won't tell you what to build. But it'll tell you if it's worth building. Free to try — 10 searches/month, no credit card needed.