数式キーボード

kasouzou

About this app

The "Equation Keyboard" lets you beautifully and comfortably write mathematical formulas on your mobile device and save them as a single image.

"Fractions and matrices get messed up when expressed as text." "Even when writing LaTeX code, you can't check if it's displayed correctly on the spot." "I want to paste beautiful mathematical formulas as images into reports and chats, but it's a hassle to start up my PC."

The "Equation Keyboard" was created to solve all these problems faced by science and engineering students, researchers, engineers, and educators.

The Equation Keyboard is a mathematical formula editor and export tool that enables intuitive input of LaTeX-format mathematical formulas on smartphones and renders them into beautiful formulas in real time with high precision. With smart, unique features, dark mode optimization, and easy sharing capabilities, it powerfully supports your mobile science and engineering life.

Four innovative features that make the Equation Keyboard the right choice:

1. Ultra-fast! Real-time LaTeX Rendering Engine
LaTeX code entered on your smartphone keyboard is instantly converted into beautiful and clear mathematical expressions in real time by the "KaTeX" engine, the de facto standard for mathematical expression display.

Even complex commands can be written while checking the display on the spot, significantly reducing input errors. It fully supports major LaTeX notations used in academic documents, from fractions, square roots, sigma, integrals, limits, matrices, arrows, mathematical and physical symbols to Greek letters. No internet connection is required; it operates at high speed completely offline.

2. Keyboard Customization Function for Freely Arranging Mathematical Symbols

It features a keyboard customization function that allows you to register frequently used mathematical symbols and complex LaTeX template codes that you repeatedly input, and freely arrange them on the keyboard.

The symbols frequently used vary from person to person, such as in analysis, linear algebra, and physics. Using this function, you can create a "one-of-a-kind personalized mathematical keyboard" that is most easy to use for your specific field of study or research. Minimize tedious key input and increase writing speed on mobile devices.

3. Two Display Modes to Maximize Expressiveness
You can instantly switch display layouts according to the length and purpose of your formulas.

• Auto-Shrink Mode
This mode is ideal when you want to beautifully fit formulas onto a single line in a standard chat screen or notepad. Even when entering long formulas, the font size is automatically fine-tuned to fit the width of the display area, preventing the formula from wrapping and becoming distorted. This allows even complex formulas and definitions to be output as a single, beautiful, complete line image, dramatically improving readability on social media and chat tools.

• Infinite Canvas Mode
This mode is for entering huge formulas that cannot possibly fit on a smartphone screen, such as complex calculus, lengthy proofs, and multivariable matrices. The canvas can be scrolled infinitely left and right, allowing you to perfectly represent and check formulas as they should be, without being cut off or having line breaks.

4. One-Tap High-Resolution Image Export & Sharing
The mathematical formulas you create can be instantly extracted as high-quality images (choose from transparent PNG, JPEG, or SVG) while maintaining their beautiful rendering within the app. These images can then be saved and shared with other apps.

Image rendering is processed in a special high-resolution mode to ensure text remains clear even on mobile devices. This dramatically improves the smoothness of using mathematical formulas in communication apps like LINE, Slack, Discord, and Teams, as well as inserting them into apps like Notion, Google Docs, and the flashcard app Anki.

5. Fully Compatible with Eye-Friendly Smart Dark Mode
The app fully supports dark mode (dark theme), which has become standard in recent mobile operating systems.

More than simply blacking the app's background, the system automatically detects when dark theme is active and switches the text color in the editor and the rendering of the formulas themselves to an "easy-to-read pure white (white)." This allows you to comfortably input formulas without glare, even during nighttime study or research, or when writing in a dark room.

It's incredibly useful in these situations!

* For daily learning of university and graduate students: "I don't know how to solve this equation in my report..." In such situations, quickly input the equation using the mathematical keyboard and send it as an image to a friend via LINE or Discord. Because the equation is neatly formatted, the intent of your question is conveyed instantly.

* For immediate communication among researchers and engineers: When you have a paper idea while on the go or traveling, or when you need to discuss equations with colleagues, you can instantly post beautiful equation images from your mobile device to Slack or Teams. Say goodbye to awkward text expressions (e.g., sending x^2 or \sqrt{x} as is).

* As a teaching tool for educators and tutors: In online classes and chat-based instruction, you can create and send explanations using accurate and easy-to-read equation images to answer students' math and physics questions. It's significantly more aesthetically pleasing than handwritten explanations, providing a professional teaching environment.

* For creating flashcards (such as Anki): When registering mathematical formulas, theorems, and fundamental physics equations on cards, simply paste clean, transparent PNG images generated with the mathematical keyboard to create the perfect learning flashcards.


Ready to use! Simple LaTeX Guide (List of Major Mathematical Formulas)

Even complex LaTeX notations that would normally require manual input can be created intuitively without tedious code entry.


* Fractions: \frac{a}{b}
* Square root: \sqrt{x}, nth root: \sqrt[n]{x}
* Exponents: e^{x}, Logarithms: \log_{2}{x}
* Superscripts and subscripts:
* Subscript: a_{n}
* Superscript and subscript combined: x_{i}^{2}
* Differential, integral, summation, and limits:
* Integral: \int_{a}^{b} f(x) dx
* Multiple integral: \iint_{D} f(x,y) dxdy
* Summarization (sigma): \sum_{i=1}^{n} a_{i}
* Limit: \lim_{x \to \infty} f(x)
* Matrices and vectors:
* Parenthetical matrix: \begin{pmatrix} a & b \ c & d \end{pmatrix}
* Square bracket matrix: \begin{bmatrix} 1 & 0 \ 0 & 1 \end{bmatrix}
* Column vector: \vec{v} = \begin{pmatrix} x \ y \end{pmatrix}
* Greek letters and mathematical symbols:
* Lowercase: \alpha, \beta, \gamma, \theta, \lambda, \pi
* Uppercase: \Delta, \Sigma, \Omega
* Arrows: \to (right arrow), \Rightarrow (if...then)
* Set symbols: \in, \subset, \cup, \cap

Experience the pleasure of smoothly inputting these characters from your smartphone keyboard and converting them into mathematical formulas in real time.

Commitment to safety and security

* Completely offline operation:
The entered mathematical formula data and LaTeX code are never sent to external servers. Because everything is processed and rendered locally on your smartphone, you can safely input highly sensitive research data and ideas. It also consumes absolutely no data.

* Elimination of unnecessary permissions:
The app requests only the minimum permissions necessary for its operation. It does not collect any data that infringes on your privacy or perform any background tracking.

What’s new

教科書や参考書のような綺麗な数式をスマホやタブレットから独自の数学キーボードで編集し、生LaTeXコードをクリップボードに貼り付けたり、PNG・JPEG等の画像としてレンダリング済みの綺麗な数式を端末に保存することができます。
数学キーボードには普段よく使う数学記号を自由に追加したりタブでまとめたりできるキーボードカスタマイズ機能を搭載しています。

【今回のアプデ内容】
・数式の色に加え、背景色も自由に選択できるようになりました。
・よく使う数式色と背景色の組み合わせを、お気に入りとして保存・管理できるようになりました。
・最近使った色の組み合わせを再利用できるようになりました。
・自動配色機能を追加しました。数式色に合わせて、読みやすい背景色を自動で選択できます。
・PNG／SVG出力では透明背景を維持し、JPEG出力では選択した背景色を反映するようになりました。
・JPEG画像の共有時に、操作しづらくなる問題を修正しました。