เครื่องมือออนไลน์

SQL sandbox

Design your own database schemas, fill tables with data, and run SQL queries.

HTTP request builder

Light REST client: method, URL, headers, body, response — in the browser.

JSON/YAML toolbox

Format, validate and convert JSON and YAML in both directions.

JWT decoder

Decode JWT header and payload, inspect claims and expiration — locally in browser.

Diff checker

Compare two texts line by line with side-by-side highlights and unified diff.

Regex checker

Test JavaScript regular expressions: live matches, groups, highlight, and replace preview.

Git Lab

Practice branches, commits, merges, and conflict resolution in a Git simulator.

Java Playground

Run a small Java subset in the browser: main, variables, loops, println — not a full JVM.

Python Playground

Run Python in the browser (Skulpt): print, loops, functions, lists — not full CPython.

Clipboard

Account-bound text cells: store snippets up to 3000 characters, lock sensitive notes, copy and paste in one click.

Flowcharts

Create and save flowcharts: processes, decisions, and connections.

CIDR calculator

Calculate subnet mask, network range, and host count from an IPv4 CIDR.

Cron helper

Parse cron expressions and see field meanings plus the next run times.

Hash generator

MD5, SHA-256, SHA-512 and HMAC from text or files — computed locally in your browser.

UUID generator

Generate UUID v4 and v7 in the browser: batch mode, formatting, copy and validate.

Timestamp converter

Convert Unix timestamp and date/time: seconds, milliseconds, ISO UTC and local time.

Color tools

Convert HEX/RGB/HSL, preview color and copy shade palette.

Google soft colors

Soft Material-style palettes for UI with copy-ready tokens.

QR code generator

Create QR from text, URL, Wi-Fi, or vCard. Customize style and export PNG/SVG.

Math 1–6

Elementary math: arithmetic, fractions with steps, percents, area and perimeter — in your browser.

Math 7–11

Algebra and graphs: linear & quadratic equations with steps, y = f(x) plot, Pythagoras and circle.

OGE / EGE

Full part-1 variants: OGE (19), EGE base (21), EGE profile (12). Answer check and solutions.

SAT / ACT Math

Full SAT Math (44) and ACT Math (60): multiple choice and grid-in, check and solutions.

Calculator

Basic and scientific calculator in the browser: expressions, trig, powers, and constants.

Quiz generator

Build quiz templates from lesson questions: pick manually or auto-generate by difficulty, then save for future sessions.

Elementary math formulas

Handy formulas for grades 1–4: arithmetic, fractions, units, geometry, and percents.

Secondary math formulas (grades 5–11)

Reference for grades 5–11: algebra, quadratics, geometry, trigonometry, progressions, and coordinates.

Physics formulas: Mechanics

Mechanics reference: kinematics, dynamics, statics, hydrostatics, work, energy, oscillations and waves.

Physics formulas: Molecular physics

Molecular physics: amount of substance, kinetic theory of gases, ideal gas laws.

Physics formulas: Thermodynamics

Thermodynamics: internal energy, heat, phase changes, first law, heat balance, engine efficiency.

Physics formulas: Electrodynamics

Electrodynamics: electrostatics, DC circuits, magnetic field, induction, AC oscillations.

IT dictionary

561 IT terms in 9 topics: programming, networks, databases, security, cloud, AI, product management, and slang.

Formula builder

Create a multi-line LaTeX formula card and drag it into a lesson.

Image gallery

Upload and store your images with descriptions and shareable links.

Image placeholder

Drag a placeholder into a lesson and describe what image should appear. Replace it later with a file upload or from Image gallery.

Sound gallery

Upload and store audio files with descriptions, groups and shareable links.

Video gallery

Upload and store video files with descriptions, groups and shareable links.

Content Studio

Create and publish articles, guides, instructions, and other materials under your author URL.

Thai alphabet

Learn the Thai script: consonants, vowels, and tones.

Thai vocabulary

Thai lexicon linked to English lemmas: words, transcriptions, and meanings.

Chess

Create chess games with a human or computer, share player and viewer links.