Free ASO Tools & Developer Suite for App Store Growth
Everything you need to audit, format, and launch your mobile app store presence. Character counters, Xcode icon resizers, ASO audit checkers, rejection risk scanners, and screenshot size guides — completely free.
What are Free ASO Tools for App Store & Google Play Optimization?
Free ASO (App Store Optimization) tools are browser-based utilities designed for mobile developers and growth marketers to audit, format, and generate store listing assets. They evaluate metadata against Apple App Store Connect and Google Play Console guidelines, count character limits, package multi-resolution icon zip files with Xcode Contents.json, analyze keyword density (1–3%), and detect rejection risks before submitting app builds.
App Icon Generator & Multi-Platform Resizer
One 1024px icon in, every iOS, Android & PWA size out as a ready-to-drop Xcode zip.
AI App Release Notes & Changelog Generator
Professional 'What's New' notes in seconds.
App Store Title & Subtitle Generator
ASO-optimized App Store title & subtitle variations under 30 characters.
ASO Keyword Suggestion & Long-Tail Idea Generator
Discover high-intent App Store keywords your competitors missed.
Description Template Generator
Category-specific app description templates.
Mobile App Privacy Policy Generator (App Store & Play Store)
Free app privacy policy in minutes.
App Store & Google Play Listing Mockup Previewer
Preview your iOS App Store & Android Google Play search result and product page cards live.
ASO Score & Listing Audit Checker
Audit your App Store listing and get an instant ASO score.
App Store & Google Play Character Counter
Stay within every App Store & Google Play character limit.
ASO Keyword Density & Frequency Analyzer
Detect overused keywords, word frequency, and density percentages in your app store description.
App Store Review & Rejection Risk Checker
Catch metadata guideline violations before submitting to App Store Connect.
App Store & Google Play Launch Checklist (2026)
Interactive pre-launch audit checklist for App Store Connect & Google Play submission.
App Store Connect & Google Play Rule Specifications
Key limits and rules enforced across Apple App Store and Google Play Console submission pipelines.
| Store Guideline | Specification Limit | ASO & Submission Impact |
|---|---|---|
| Apple App Store Title & Subtitle | Max 30 characters each | Primary keyword ranking weight; hard submission rejection if exceeded |
| Apple App Store Keyword Field | Max 100 characters (Comma-separated) | Direct indexing; space removal saves 10-15 characters for extra keywords |
| Apple App Store Primary Icon | 1024 × 1024 px (RGB PNG/JPEG, No Alpha) | Mandatory primary icon for App Store Connect submission |
| Google Play Store Icon | 512 × 512 px (32-bit PNG, Max 1MB) | Required store listing icon; alpha transparency prohibited |
| Primary iPhone Screenshot Set | 6.9" Display (1320 × 2868 px portrait) | Required primary screenshot upload slot for modern iPhones |
| Mandatory Privacy Policy URL | Apple Guideline 5.1.1 & Play Safety | Required for all app submissions; submission blocked if URL is missing or broken |
How to Prepare an App Launch in 4 Steps
Streamline your metadata verification, icon exports, and screenshot creation before submitting to Apple or Google.
Audit Current Metadata & ASO Health
Use the ASO Score Checker and Keyword Density Analyzer to evaluate your title, subtitle, and description against algorithm guidelines.
Generate Optimized Assets & Icons
Use the App Icon Generator, Title Generator, and Release Notes Generator to build store-ready assets in seconds.
Check Rejection Risks & Limits
Run the Rejection Risk Checker and Character Counter to catch guideline violations and character limit overflows before submission.
Design Screenshots & Submit
Reference exact Screenshot Sizes (1320×2868 px) and open the App3DShot 3D editor to export pixel-perfect store screenshots.
Frequently Asked Questions
Everything you need to know about our free App Store developer tools.
Q:Are all tools on this hub 100% free to use?
Yes! Every developer tool on App3DShot operates 100% free inside your web browser. There are no paywalls, hidden fees, or signup requirements.
Q:Does my uploaded icon or metadata leave my web browser?
No. All image decoding, icon resizing, character counting, and zip generation execute locally on your computer using client-side JavaScript and WebAssembly Canvas. Your files and copy are never uploaded to our servers.
Q:How does the App Icon Resizer zip file work with Xcode?
The generated zip contains an AppIcon.appiconset folder with a pre-configured, valid Contents.json file. You can drag and drop the folder directly into Assets.xcassets in Xcode to populate all iOS icon slots instantly.
Q:What guidelines are evaluated by the App Store Rejection Checker?
The checker scans your metadata against Apple App Store Review Guidelines (specifically Rule 2.3.7 regarding pricing/rankings in titles and Rule 2.3.1 regarding competitor platform names) and Google Play Console policies.
Q:Can I generate 3D app store screenshots using these tools?
Yes! While these free tools handle metadata auditing and icon resizing, you can launch our App3DShot Studio Editor anytime to place your app screenshots inside photorealistic 3D iPhone, Android, and MacBook frames.
Q:How often are screenshot dimensions updated?
Our Screenshot Sizes guide is updated continuously to reflect the latest device releases (including iPhone 16 Pro Max 6.9" display specs and 13" M4 iPad Pro specifications).
Q:Do I need to sign up for an account to download generated icon zips?
No signup is required. Click the download button on the App Icon Resizer or any generator tool, and the zip file saves directly to your device.
Q:What is the difference between free tools and AI Features?
Our free developer tools run instantly in your browser for instant utilities like character counting, icon resizing, and dimension checks. Our AI Suite (/ai) uses advanced language models to generate ASO copy, localizations, and mesh gradients.