HSL/HSV Color Picker (www.oh-benri-tools.com)
A color picker for adjusting HSL, HSV, RGB, and alpha values with sliders. Features color saving and history, and supports preset palettes including Material Design and Flat UI.
How Many Days Until Saturday?
An online tool that counts the remaining days until Saturday (or any day of the week). Also supports fullscreen display and image download.
English Word Counter (www.oh-benri-tools.com)
An online tool for counting words, sentences, characters, and lines in English text. Supports file drop or direct text input, and input content is not sent to the server.
Easy Timer (www.oh-benri-tools.com)
A simple online timer with one-click time setting. Choose from presets ranging from 30 seconds to 60 minutes, with adjustable alarm sound type and volume. Fullscreen display supported.
CSS Color Tester (www.oh-benri-tools.com)
An online tool for testing combinations of text color, box color, and background color with a color picker in real time. CSS output is automatically generated, making it useful for confirming web design color schemes.
Color Code Converter (www.oh-benri-tools.com)
An online tool for converting between RGB (decimal), hexadecimal, RGBA, and CSS color formats. Instantly displays results in multiple formats in real time after input.
Clock (www.oh-benri-tools.com)
An online clock that displays the current time. Shows accurate time and supports display format switching and fullscreen view.
Character Counter (www.oh-benri-tools.com)
An online tool for counting characters in text. Supports drag-and-drop file input and multiple counting methods, including handling of newlines and double-byte characters. Includes conversion to manuscript page equivalent.
Calendar (www.oh-benri-tools.com)
An online calendar for viewing monthly or yearly views. Supports Japanese public holidays, customizable week start day, and fullscreen display. Choose from 1-month, 2-month, or yearly views.
Calculator (www.oh-benri-tools.com)
An online calculator for performing arithmetic calculations in a browser. Supports mouse or keyboard input, and multiple calculators can be used simultaneously. Also supports automatic sum and average calculation across multiple instances.
Bubble Wrap Popper
A simulator game where you pop virtual bubble wrap by clicking or dragging. Displays a count of popped bubbles, with fullscreen display and volume adjustment support.
BMI Calculator (www.oh-benri-tools.com)
An online tool that calculates BMI by dragging sliders for height and weight. Displays body type classification in real time, with an option to download the result as an image.
