CodeFlash: Runnable code cards

Code it. Remember it. Flash it! A casual flashcard app for memorizing small bits of code and syntax. It also works as a standard flashcard app!

[ Recommended for ] • Anyone learning programming • People who want to learn common syntax and patterns by heart • Anyone who wants to review on the go or in spare moments • Anyone looking for a personal flashcard app — code or otherwise

[ Features ]

■ Learn by writing code Type code into your cards and run it instantly to check the output. Supports JavaScript, TypeScript, Python, HTML, CSS, SQL, and C++ — learn by doing, not just reading.

■ See HTML and CSS as an actual page (Pro) Your code renders as a real page right inside the card. Go full screen and you can click buttons and type into inputs for real. It's also a great way to practice DOM manipulation from JavaScript.

■ Create cards with 3 types of blocks Combine text, code, and image blocks freely. Text blocks support Markdown — headings, lists, bold, tables, and more.

■ Efficient spaced repetition learning The FSRS algorithm adjusts each card's next review to your understanding, for effortless, lasting memorization.

■ Organize and study with tags Create your own categories like "Basics", "Advanced", or "Review" and study across decks.

■ Track progress with stats and graphs See your study activity on a contribution graph, plus overall progress, deck mastery, and rating breakdown.

■ Works offline Your learning data is stored on your device (and in your own iCloud when sync is on) and is never sent to external servers. No account registration required.

[ Great even on the free plan ] • No limit on the number of decks or cards • No ads • Export / import your data (save the file to iCloud Drive, etc. and load it on another device)

• Existing features will never be moved behind a paywall.

[ What you get with Pro ] A one-time purchase. A 7-day free trial is available.

• iCloud Sync: sync your data across devices on the same Apple ID. On a new device, just toggle it on to restore everything • HTML / CSS Preview: see the result as a real page and interact with it full screen. You can also register shared HTML and images on a deck • SQL / C++ Execution: register deck-wide setup SQL and query the same database from every card • Detailed Statistics: monthly study volume, per-grade rankings (top 10), and per-card performance • Color Themes: 10 presets × light/dark to restyle your cards and the whole app • FSRS Customization: tune review intervals to your own pace — shorter for thorough review, or longer for relaxed learning • Study Timer: a pie-style countdown (1–60 min) that runs only while studying. Repeat it for Pomodoro (study → break)

[ Other Features ] • Card search, card duplication, and card transfer between decks • Shuffle cards to study • Archive decks and cards (excluded from study and stats) • JSON export / import (full backup) • TSV export / import (card text and other partial data) • Daily reminder notifications • Dark mode • Bluetooth keyboard shortcuts • Available on both iPhone and iPad

• Running HTML, CSS, SQL, and C++, and previewing JavaScript, are Pro features.
• Internet is required only for iCloud sync and running Python / C++ (Python loads its execution environment; C++ is sent to Wandbox, an external service — no account or personal info is included).

Try the free version first!