STJ Digital

Simple tools that save time.

Offline apps, Excel templates, printables, and online tools designed to solve everyday problems.

All Tools

Everything, in one place.

Interactive Sand Art Toy

Pour, pile, and shape colorful sand into your own unique creations.

Burn the Letter – Letting Go Ritual

Write what you’re ready to let go of, then watch it burn away.

Japanese Printable Flashcards

Printable Japanese flashcards for building everyday vocabulary.

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Excel Templates

Anime & Manga Tracker

Track anime, manga, progress, ratings, and organize your entire collection.

French Printable Flashcards

Printable French flashcards for building everyday vocabulary.

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German Printable Flashcards

Printable German flashcards for building everyday vocabulary.

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CSV Repair & Cleanup Tool

Fix broken CSV files, remove common errors, and export clean data.

Excel Templates

Home Bakery Pricing Calculator

Calculate recipe costs, profits, and selling prices with confidence.

Excel Templates

Subscription Tracker Excel Template

Track subscriptions, monitor spending, and discover money leaks before they add up.

Printable Flashcard Generator

Create custom flashcard sets for any subject, ready to print at home.

Japanese Kanji Study Tool

Learn Japanese kanji with flashcards, quizzes, and progress tracking.

Random Rule Generator

Generate a random silly rule to add a little fun and unpredictability to your day.