Free ASO tools
Score any App Store page, count metadata characters against Apple’s limits and find every screenshot size — free, no sign-up.
Tools
What’s your app’s ASO Score?
Paste any App Store link and get a 0–100 grade, a leaderboard against similar apps and the fixes worth the most points.
App Store metadata character counter
Check your name, subtitle and 100-byte keyword field against Apple’s limits, with live tips for wasted space.
App Store screenshot sizes
Every required and optional screenshot size for iPhone, iPad, Mac, TV, Vision Pro and Watch — checked October 2026.
Learn the craft
App Store Optimization (ASO): the complete guide for iOS developers
Learn how App Store search ranks apps, which metadata fields matter, how ratings and screenshots drive conversion, and a 30-day ASO plan for your iOS app.
How to use the App Store keyword field (all 100 characters of it)
Format, rules and strategy for the App Store keyword field: commas without spaces, plurals, no repeats, no trademarks, and how words combine across fields.
How to write an App Store title and subtitle that rank and convert
Write a 30-character App Store name and subtitle that rank and convert: the brand + keyword pattern, examples by category and the mistakes that cost downloads.
See how your App Store page scores — free.
Paste your App Store link and get an ASO Score with the fixes that matter most. Then let Appsium research keywords, write metadata in every language and design your screenshots.