Cmdex

Flashcard quizzes with spaced repetition now included. Turn command lookups into muscle memory across Linux, Python, Docker, Git, and 20 more platforms.

Stop re-Googling the same command every few weeks.

Cmdex puts 978 commands across 23 platforms in your pocket — searchable, offline, and organized the way you actually think about them. Whether you're deep in a terminal, debugging a Cisco switch, or writing regex at 2am, the syntax and a real working example are one search away.

WHAT'S INSIDE • 23 platforms: Linux, Bash scripting, zsh, PowerShell, Python, JavaScript, Ruby, Rust, Swift, Kotlin, Go, C++, SQL, CSS, HTML, Markdown, Docker, Git, YAML/Terraform, Cisco IOS, regex, and pentesting tools • 978 commands, each with a plain-English explanation and a real, runnable example — not just a syntax stub • Organized by category and difficulty (beginner / intermediate / advanced), so you're not wading through advanced flags on day one

FIND ANYTHING FAST • A universal command palette searches every platform at once — type "grep" and see grep, ripgrep, ngrep, and PowerShell's Select-String side by side • Filter by category, difficulty, or platform • Compare mode puts equivalent commands from different platforms next to each other

LEARN, DON'T JUST LOOK UP • Built-in flashcard quiz with spaced repetition — the app tracks what you know, resurfaces what you're shaky on, and builds a daily review streak • A new "Command of the Day" to build the habit

MAKE IT YOURS • Favorite commands and organize them into custom collections • Export a printable PDF cheat sheet for the platforms you care about • Light and dark themes, both designed for long reading sessions

WORKS OFFLINE Everything is bundled on-device. No account, no sign-in required — it works on a plane as well as it works at your desk.

Whether you're a student learning your first shell, a developer switching between five languages a day, or a network engineer who only touches Cisco IOS twice a year, Cmdex is the reference you open instead of your search history.