GoodTools - Tiny tools
A collection of mini tools
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
A pocket toolbox of clever mini tools — notes, calculators, converters, prime & π math, an emoji board, and more. Free, fast, and works offline.
GoodTools — a toolbox that fits in your pocket.
GoodTools gathers dozens of handy mini tools in one clean, fast app. No clutter, no accounts, no sign-up — just open the app and grab the tool you need. Everything runs on your device, offline, with a friendly grid layout and full dark-mode support.
Everyday tools
Note — a scratchpad that saves as you type, so your thoughts are never lost.
Calculator — a clean circular-key calculator for quick sums anywhere.
Temperature Converter — drag a vertical slider from −30 °C to 120 °C and read °C and °F side by side instantly.
Time — a beautiful always-black clock showing the current time to the second; rotate the digits to fit your screen.
Emoji Board — a grid of hundreds of the most-used emoji and special characters; tap any one to copy it.
Math & science tools
Factorial — exact n! for any number up to 1000, shown in full digits (no scientific notation).
Factorizer — instant prime factorization of numbers up to 10,000,000.
Prime Checker — check huge numbers (up to 20 digits) for primality and browse the following 30 numbers with live prime markers as you scroll.
Pi 10000 — browse the first 10,000 digits of π in a scrollable, copyable view.
Constants — a quick reference of the most useful math and physics constants with values and units.
Random Number — tap for a fresh random number between 1 and 100.
Fun & playful tools
Year Progress — see how much of this year has already passed, with the percentage ticked every second.
Vibrate — press and hold the screen to feel continuous haptics, release to stop.
Cube — a 3D cube you can spin and tumble with your finger (iOS 18+).
Toss Coin — tap anywhere to flip a 3D coin high into the air with realistic spins and a satisfying landing buzz; check ○ or × (iOS 18+).
Clean by design
All tools open from one tidy 4-column grid — no endless menus.
Native look and feel with smooth animations, haptic feedback, and accessibility labels.
Optimized for iPhone and iPad, light and dark modes.
Private by default GoodTools collects no personal data. Notes and settings stay on your device, and the app works completely offline.
If you love GoodTools, please leave a rating — it helps more people find it. Ideas or problems? Write to us at feedback@luanlujizhi.com and we’ll get back to you.
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: Angle converter, Globe, Countdown, Stopwatch
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.
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
- 2.2 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.
- iPhone
- Languages
- English and Simplified Chinese
- Age Rating
4+
- 4+
- Copyright
- © 2026 Good tools