9 Free Tools for App Store & Google Play Developers (No Signup Required)

The WhixFrame Free Tools Hub is a collection of 9 utilities built specifically for mobile app developers, marketers, and indie hackers.

These tools cover visual assets (screenshots, mockups, icon previews), App Store Optimization (character limits, keyword density), and pre-launch necessities (color palettes, privacy policies, launch checklists).

All 9 are 100% free. No signup required. No paywalls. No credit card prompts. Bookmark this page and use whichever tool you need, whenever you need it.

Why We Built Free Developer Tools

Our core mission is to help developers launch and grow their apps faster. While our main platform offers AI-powered screenshot, icon, and video generation, we realized there was a lack of simple, fast, and reliable tools for the everyday tasks of app publishing.

We were tired of looking up "iPhone 16 Pro Max screenshot size" or trying to remember the character limit for a Google Play short description. We wanted these utilities in one place. So we built them.

Here is a breakdown of what is available today in the hub:

1. App Store Screenshot Generator

Upload a raw screenshot, add a device frame, a gradient background, and a headline, then export a store-ready listing image, free and no signup, in your browser. Exports carry a small watermark; the AI-powered Screenshot Studio removes it on a Pro or Business plan.

Try the Screenshot Generator →

2. App Store Screenshot Size Checker

A comprehensive reference guide for every required and optional screenshot dimension across iOS, iPadOS, watchOS, and Android. It features a one-click copy function for dimensions and platform-specific filtering so you never get rejected by App Store Connect for the wrong image size again.

Try the Screenshot Size Checker →

3. Screenshot Mockup Previewer

Want to see how your raw app screenshots look inside actual device frames? Upload your images to our previewer to instantly see them framed in an iPhone 16 Pro, iPad Pro, or Google Pixel 9. It is the fastest way to visualize your store listing before you hit submit.

Try the Mockup Previewer →

4. App Icon Previewer

An icon that looks great at 1024x1024 might become an illegible blur when scaled down to 20x20 in the iOS notification center. Our icon previewer lets you upload your design and instantly see it rendered at every single required size for both iOS and Android.

Try the Icon Previewer →

5. App Store Character Counter

Writing ASO metadata is an exercise in precision. Our specialized character counter tracks your app name, subtitle, promo text, and description against the exact limits enforced by the Apple App Store and Google Play, complete with visual progress bars.

Try the Character Counter →

6. ASO Keyword Density Analyzer

Crucial for Google Play optimization. Paste your app description into the analyzer to see your top 20 keywords, their occurrence count, and their density percentage. It will automatically warn you if you cross the 5% threshold, saving you from algorithmic penalties for keyword stuffing.

Try the Keyword Density Analyzer →

7. App Color Palette Generator

Stuck on choosing brand colors for your new app? This generator creates mathematically harmonious palettes, checks them against W3C accessibility contrast ratios, and previews them on a live mobile UI mockup. Export straight to CSS variables when you are done.

Try the Color Palette Generator →

8. Privacy Policy Generator

Both Apple and Google require a live privacy policy URL for app submission. Our generator lets you check the data types your app collects (location, camera, analytics) and instantly generates a GDPR, CCPA, and App Store compliant policy in plain text or HTML.

Try the Privacy Policy Generator →

9. App Launch Readiness Checklist

Launching an app has dozens of moving parts. We condensed our internal launch playbook into an interactive 36-point checklist covering visual assets, metadata, legal compliance, technical readiness, and marketing.

Try the Launch Checklist →

Frequently Asked Questions