Software Engineer

Samba Nugraha

I build practical software and small, useful tools — simple things that solve everyday problems.

Browse the tools GitHub

Android apps

Apps I publish on Google Play. Both are fully offline — no account, no internet permission, and nothing that leaves your phone.

  • Stokancil

    Offline point-of-sale and stock book for small shops — sales, barcode scanning and thermal receipts, with no internet permission at all.

  • Kaskucing

    Offline daily cash book for Android — record what you spend in seconds, then see where the month actually went. No account, no signal needed.

Tools

Small, self-contained web tools. Free to use, no sign-up, everything runs in your browser.

Finance

  • Stock Average Calculator

    Work out your new average cost when buying more shares at a lower price, and see how far your break-even moves.

Games

  • Tic-Tac-Toe

    Play a friend on one device, or challenge the computer on easy or hard.

  • Snake

    The classic — eat, grow, speed up. Arrow keys or swipe, best score saved.

  • 2048

    Slide and merge tiles to reach 2048. Your game saves automatically.

  • Memory Match

    Flip cards to find all the emoji pairs in as few moves as you can.

  • Lone Kings

    A logic puzzle: one king per row and column, no two touching. Uniquely solvable.

  • Sudoku

    Classic 9×9 number puzzle in four difficulties, with notes, hints, and conflict checking.

  • Photo Slide Puzzle

    Turn your own photo into a sliding puzzle, then download it to play offline anywhere.

Everyday

  • Character & Word Counter

    Count characters, words, sentences, lines, and reading time as you type, with an optional character limit.

  • Password Generator

    Generate strong random passwords locally, with length and character options and a strength meter.

  • Random List Picker

    Draw fair random winners from any list of names — for arisan, doorprizes, and giveaways.

Developer

  • Base64 Encoder & Decoder

    Convert text to Base64 and back, with full Unicode and a URL-safe option. Encoding, not encryption.

  • Unix Timestamp Converter

    Turn epoch seconds or milliseconds into readable dates — local or UTC — and dates back into timestamps.

  • JSON Formatter & Validator

    Pretty-print, minify, and validate JSON with error messages that point at the exact line and column.

  • URL Encoder & Decoder

    Percent-encode text for URLs and decode it back, with component and form-data modes.

  • JWT Decoder

    Peek inside a JSON Web Token — header, payload, and expiry — without sending it anywhere.

  • Hash & UUID Generator

    SHA-1/256/384/512 hashes of any text plus random UUIDs, generated locally by your browser.

  • Cron Expression Builder

    Build cron schedules visually — standard and Quartz formats, with the next run times in your timezone.

  • Text Diff Checker

    Compare two texts line by line with highlighted additions, removals, and in-line changes.

  • Color Converter & Contrast

    Convert between HEX, RGB, and HSL, and check WCAG text contrast for accessibility.

About

I'm a software engineer who enjoys turning small, recurring annoyances into simple tools that just work.

This site is where I publish those tools — each one is a plain, fast web page with no accounts and no tracking.

Contact

Found a bug in one of the tools, or have an idea for a new one? Get in touch.