GoodTools - Mini tools

A collection of mini tools

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

Mini tools in one app: calculator, stopwatch, countdown, notes, clipboard, QR codes, color mixer, converters, prime & π math, 3D globe, emoji. No ads, no signup, offline. GoodTools — a whole toolbox of handy mini tools in one tiny, offline app. No sign-up, no account, no ads, no network. Open it and grab what you need: a calculator, a stopwatch, a globe, a color mixer, a QR code, and more. Everything works offline. Every tool is built in and every result is computed on your device. GoodTools never connects to the internet and never collects your data — the only permission it asks for is the vibration a few tools use. Your notes and clipboard history never leave your iPhone or iPad. ALL THE TOOLS, SORTED BY WHAT YOU NEED Everyday • Calculator — four-function math, 12-digit display, circular keys • Stopwatch — start, pause, resume, lap, reset; centisecond MM:SS.CC timing • Countdown — wheels for hours, minutes and seconds, then a big full-screen countdown that keeps running while you are away • Note — a full-page notepad that saves as you type • Clipboard — keeps up to 100 snippets in a local history; tap a row to copy it back • QR Code Generator — turn text or a link into a crisp QR code and share it Math & Numbers • Factorial — exact factorials up to 1000, in full, with no scientific notation • Factorizer — break any number up to 100,000,000 into its prime factors • Prime Checker — test numbers of up to 20 digits, then scroll on for the following numbers with instant prime marks • Random Number — one tap for a fresh random number • Pi 10000 — the first 10,000 digits of π, scrollable and copyable • Constants — 14 physical and mathematical constants with values and units Converters • Temperature Converter — a slider in 0.1° steps from −30 °C to 120 °C, with °C and °F side by side • Angle Converter — any angle from 0° to 359°, read in degrees, radians and multiples of π Clocks & Time • Time — a bold, always-black full-screen clock ticking every second; rotate the digits to fill your screen • Year Progress — how much of this year has already passed, to six decimal places • New Year — how many days are left until 1 January Colors & Graphics • Color Mixer — four sliders for red, green, blue and alpha, a live preview, and the hex as #RRGGBB or #RRGGBBAA • Saved Colors — up to 100 of your mixed colors, ready to copy with one tap • Common Colors — 44 classic, material and neutral colors with their hex codes • Text to Image — up to 500 characters turned into a clean 1024×1024 image • Draw — sketch with your finger, undo the last stroke, and share the drawing as a PNG Play & Explore • Toss Coin — tap anywhere to flip a 3D coin high into the air, with a satisfying landing buzz (iOS 18+) • Cube — a 3D cube you can spin and tumble with your finger (iOS 18+) • Globe — a real 3D Earth with coastlines that spins under your finger • Ten Pick — a 10-sector wheel picks 1 to 10, with a tick as each one goes by • Hundred Pick — 1 to 100 on a 10×10 board; one tap lights 30 numbers in turn, slowing until the winner stays lit • Emoji — 336 emoji in a tidy grid; tap any one to copy it • Vibrate — press and hold anywhere for a steady vibration, up to 10 seconds WHY YOU'LL LIKE IT • Truly offline — works in the subway, on a plane, anywhere • Instant and clean — every tool opens at once, from one tidy grid of icons • Made for everyone — iPhone and iPad, portrait and landscape, light and dark mode, with VoiceOver labels PRIVACY FIRST GoodTools has no network access, so your information cannot leave your device. No trackers, no analytics, no accounts. Your note and clipboard history stay on your device. ABOUT GoodTools is a small app by an independent developer, made one tool at a time and polished until it feels right. If you have an idea for the next tool, send your feedback from the side menu — it is genuinely read. Download GoodTools today, and keep a whole toolbox in your pocket. Love it? A rating helps more people find it. Ideas or problems? Write to feedback@luanlujizhi.com. https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

New tools: Clipboard, Ten pick, Hundred pick, QR code generator, Color mixer, Saved colors, Text to image, Common colors, Draw, New year.

Version 1.0.3

The developer, Hangzhou Luanlu Several Network Technology Co., Ltd, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    Hangzhou Luanlu Several Network Technology Co., Ltd
    Size
    2.8 MB
    Category
    Utilities
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English and 4 more
    • English, French, Japanese, Korean, Simplified Chinese
    Age Rating
    4+
    Copyright
    © 2026 Good tools
  • Privacy Policy

    • More by Hangzhou Luanlu Several Network Technology Co., Ltd

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