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ASO Tools for Indie Developers
18 free tools to optimize your App Store and Google Play listings. Keywords, descriptions, screenshots, audits: everything in one place.
Metadata
App Store Description Optimizer
Rewrite your App Store description for clarity, keyword density, and conversion. Paste your current description and get an optimized version instantly.
Try it free →First Paragraph Hook Analyzer
Score the 200 to 250 character above-the-fold hook of your App Store description. Detects 5 opening patterns, 6 anti-patterns, renders the visible preview.
Try it free →Subtitle Optimizer
Craft a high-converting App Store subtitle that balances keywords with readability. Test multiple variants side by side.
Try it free →Character Counter
Check character and word counts against App Store and Google Play field limits: title, subtitle, keywords, description, and more.
Try it free →Release Notes Generator
Turn your changelog or commit messages into polished App Store release notes. Pick a tone and get ready-to-paste update text.
Try it free →Localization
Keywords
Keyword Researcher
Find high-impact, low-competition keywords for your App Store listing. Enter your app category and get keyword suggestions ranked by opportunity.
Try it free →Keyword Field Optimizer
Pack your iOS 100-char keyword field to the limit. Strips duplicates and words Apple already indexes from your title or subtitle.
Try it free →App Store Indexed Fields Map
Reference for every iOS and Google Play metadata field. Character limits, indexing status, and 2026 changes (screenshot OCR, in-app events).
Try it free →Screenshots
Screenshot Copy Generator
Generate compelling captions and taglines for your App Store screenshots. Enter your app name and features, get ready-to-use copy.
Try it free →Color Palette Generator
Extract brand colors from your app icon or screenshot and get builder-ready background gradients. Runs in your browser, no signup.
Try it free →Caption Readability Checker
Check if your screenshot caption renders cleanly at App Store thumbnail size. Character, word, and rendered font-size scoring per device.
Try it free →Device Dimensions Reference
Quick reference for every App Store and Google Play screenshot size requirement: iPhone, iPad, Android phones, and tablets.
Try it free →App Preview Video Specs
Apple App Preview video requirements in one filterable table. Length, resolution per device, format, frame rate, audio rules for 2026.
Try it free →Need screenshots too?
AppScreenshotStudio: describe your app, see a first set, refine via chat until it clicks. No design skills needed.
See plans →