A new tool every day
Free tools that run in your browser
Converters, generators and calculators that do the job on your own device — your files and your data never leave it. No signup, no email, nothing to install.
18 tools
App User Retention Calculator
Turn your Day 1, 7 and 30 retention into a projected curve out to a year - and see if your own numbers even add up.
App Development Timeline Estimator
See how many weeks your app actually needs - broken into discovery, design, build, testing and store review.
App Terms of Service Generator
Answer a short questionnaire and get a complete Terms of Service for your app — including the clauses Apple requires in a custom EULA.
Subscription Break-Even Calculator
See exactly which month your subscription business turns a profit - churn included, not ignored.
ASO Keyword Checker
Check your App Store and Google Play keywords for wasted characters and duplicates - free, no signup.
App Launch Checklist
Everything to check before you submit to the App Store and Google Play - free, no signup.
App Store Description Generator
Turn your app's features into App Store and Google Play copy — free, instant, no signup.
MVP Scope Planner
Turn a messy feature list into what ships first - free, instant, no signup.
App Maintenance Cost Calculator
Turn the vague "15-20% a year" rule of thumb into a real number - free, instant, no email.
App Revenue Calculator
Model what your app actually earns after churn and the app store's cut - free, instant, no email.
App Icon Generator
One image in, every iOS and Android icon size out — including proper adaptive icon layers. Free, and nothing is uploaded.
App Store Screenshot Generator
Turn raw simulator screenshots into captioned store images at the exact pixel sizes Apple and Google require — free, in your browser.
CSV to JSON Converter
Convert CSV to JSON and back — parsed in your own browser, so the file never leaves your machine.
Image Converter & Compressor
Convert and shrink PNG, JPG and WebP images right in your browser — batch, unlimited, and nothing is ever uploaded.
Free QR Code Generator
Static QR codes that never expire — URL, WiFi, contact card and more, generated in your browser and free forever.
App Development Cost Calculator
Answer four questions and see a real fixed price and a build timeline — instantly, free, no email.
App Name Generator
Get 24 real app name ideas from one sentence — each with a live .com availability check.
App Privacy Policy Generator
Answer a short questionnaire and get a complete privacy policy for your app — plus the exact answers for Apple's and Google's store forms.
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Built by US APP Team
Need more than a free tool?
We build custom mobile apps for founders and small businesses — idea to live on the App Store and Google Play. Fixed price, no surprises, and you own the code.
Start your app brief Takes about 3 minutes · or book a free intro call