We make mobile apps.
Ggeomddakji is a one-person software studio that designs, develops, and publishes mobile applications for Android and iOS on Google Play and the App Store.
What we do
Android development
From planning through development and day-to-day operation of apps distributed on Google Play.
iOS development
Building apps for the Apple App Store and keeping them updated over time.
Operation and support
Bug fixes, improvements, and answering user questions — all handled directly.
Apps
Ggeomddakji — the name means something that sticks with you — builds apps that do exactly that. Simple enough to understand the moment you open them, handling only the data the service actually needs, and maintained long after launch.
- The list shows the time remaining for every alarm, like "in 9 hr 53 min" — including how much sleep you would get if you went to bed now.
- Built on the iOS alarm framework (AlarmKit), so it rings through the silent switch and Focus modes and survives a restart.
- A 12-hour time picker where you choose AM/PM yourself, per-weekday repeats, and skipping just the next one.
- Built-in alarm sounds plus your own audio from the Files app, with preview.
- Home and Lock Screen widgets, Siri Shortcuts, and Live Activities.
- Type an amount once and every selected currency converts at the same time. No switching back and forth to compare.
- 166 currencies supported, with a built-in calculator keypad.
- The latest rates are stored on device so it works offline, and the screen tells you how old the data is.
- Decimal arithmetic end to end, so there are no floating-point rounding errors.
- Convert straight from a Home Screen widget.
- Create a trip and you get "Before the trip" plus Day 1 through the last day, so expenses are organised by trip and by day.
- Type yen, dong or euros exactly as printed and the converted amount is kept alongside. The rate at the moment you record is stored, so past trips never shift.
- Everything stays on your device and works offline, with no sign-in. On iOS, iCloud keeps your devices in step on its own.
- Split costs with your companions and see who owes whom, plus statistics by category, day, payment method and currency.
- Backups to the device, iCloud Drive (iOS) or Google Drive in a format both versions share, a Home Screen widget, and a currency calculator.
- Five difficulties of 2,000 puzzles each, sorted by the technique they require. Every puzzle has exactly one solution, so you never have to guess.
- Ten illustrated lessons on real boards, from naked pairs to X-Wing, Swordfish and XY-chains.
- A hint opens the one square you choose, and a check tells you only how many numbers are wrong. The rest stays yours.
- Self-tidying pencil notes, unlimited undo, boards that wait for you for weeks, and per-difficulty records and streaks.
- No account and fully offline — your record stays on the device. Two-pane layout on tablets and foldables.
- Eat a candy and your marble glows in its colour — while it glows, bump friends of the same colour to pop them. Hit another colour and the glow goes out.
- A one-finger physics puzzle: hold the left or right side to fly up that way. The first stage teaches you step by step.
- 500 stages across five worlds, with friends that drift, run away, take two hits, or split in two.
- Saw wheel, shield, ghost orb and clock items, plus wind, two-way portals and a ghost that chases you if you dawdle.
- Three stars to chase, world and country leaderboards, and trails and pop effects unlocked by achievements.
- Your passwords are encrypted on your device with a master password only you know. Nothing to sign up for, and no developer server.
- Unlock with Face ID or fingerprint, AutoFill in your browser and other apps, and copied passwords cleared from the clipboard automatically.
- Give each item an owner and manage the whole family's accounts in one vault, filtered by person.
- Unlimited items, encrypted backups and CSV export — security features are always free.
- AES-256-GCM encryption; no analytics, no ads, no tracking.
- Pick a photo, crop it, choose the size and number of colours, and get a numbered gem pattern. Photos are converted on your device and never uploaded.
- 90 ready-made patterns in six categories: animals, flowers, little treats, seasons, nature and cozy things.
- Relaxing to play: choose a number and tap matching cells to place glossy 3D gems. Zoom and pan, automatic saving, and hints when you are stuck.
- Save finished art as a 1600×1600 PNG for free and share it.
- A one-time Lifetime Pass (not a subscription) — photo patterns, unlocks and hints without ads.
- Five books, twelve techniques, from naked singles to X-Wing, Swordfish, XY-Wing and simple colouring, taught step by step on real boards.
- Learn → Drill → Solve. Read the lesson, find that one technique on its own and get graded, then solve puzzles where it is the final key.
- A hint does not just fill in a number — it names the technique, points to the cells it rests on and explains why.
- 10,000 puzzles graded by the last technique they need, each with exactly one solution. Pencil notes, undo, board check and daily attendance.
- Every puzzle is inside the app, so it works offline; with no account, iCloud keeps your iPhone and iPad in step.
- Move tiles that are uncovered and open on one side into a four-slot tray and match two of the same animal. No time limit.
- Stroll, Explore or Challenge — 300 levels, with hint, shuffle and undo when you are stuck.
- Clear levels to welcome new friends into your group photo: 24 animals, 20 garden backgrounds and matching effects to collect.
- Separate SFX, music and vibration settings, a choice of full or gentle motion, and landscape play on phones and tablets.
- Progress and collections stay on your device; online rankings join in when you are connected.
- Pick a pattern, choose a colour from the numbered palette and tap matching cells to place beads one by one — the last bead brings a gentle ironing effect.
- 90 original patterns across animals, food, plants, objects, seasons and patterns, 12 of them free.
- Make a pattern from your photo — unlimited 29×29, 8-colour photo patterns for free. Photos are converted on your device.
- Zoom and pan, automatic saving, separate music, sound and vibration switches, PNG saving and sharing, and file backups.
- No ads, no sign-up, no subscription. A one-time Premium unlocks every pattern, larger boards and per-pegboard PNGs.
- Simple rules: exactly one fox in every row, column and colour area, and foxes never touch, not even diagonally.
- 1,170 puzzles from 5×5 up to 12×12, each with a single solution reachable by logic alone.
- Step-by-step hints that explain why a tile must be a fox or an X, plus undo and a clear tutorial.
- Earn Sunshine to decorate your fennec den and choose fur colours, accessories and board themes.
- Global ranking, cloud backup with a recovery code, and no ads.
Chromibop, Gumlock, Gemnori, Mongle Pair Puzzle, Beadnori and Fennec Fox Puzzle support five languages (all but Chinese); the other apps support Korean, English, Japanese, Simplified Chinese, Spanish, and German (all but Journey Ledger default to English). Beoltteok and Exchange Calculator have no paid features — their only in-app purchase is an optional tip to support development. Journey Ledger is free to use; a one-time Pro unlock (not a subscription) is needed only to create a third trip or more, or to use automatic and Google Drive backups. Sudoku Holic is free; if you like, a short ad refills hints and hearts, but no ad is ever needed to finish a puzzle. Chromibop is free with no in-app purchases; ads are optional and appear only when you choose one for hearts, a continue or a help item. Leaderboards use only a nickname and a country. Gumlock keeps every security feature free; iCloud or Google Drive sync, automatic backups, attachments and widgets come with a one-time Pro purchase (not a subscription). Gemnori is free, and its only ads are rewarded videos you choose to watch; a one-time Lifetime Pass (not a subscription) gives you photo patterns, unlocks and hints without ads. Sudoku Classroom is free, with no banners or full-screen ads; a short video plays only when you choose it for extra hints or to restore hearts. Beadnori has no ads; 12 patterns and 29×29, 8-colour photo patterns are free, and a one-time Premium purchase (not a subscription) opens every pattern and larger boards. Fennec Fox Puzzle has no ads; the 70 adventures from 5×5 to 9×9 need no purchase, and larger puzzle packs and some cosmetics are optional in-app purchases.
Principles
Keep it simple
A screen that needs no manual. Before adding a feature, we look for one to remove.
Keep it light
No unnecessary permissions and no data collection — only what the service actually requires.
Keep it going
Shipping is the start, not the end. Questions and bug reports turn into updates.
New releases, including Android versions, will be added to this page as they arrive.
Business information
| Business name | 껌딱지 (Ggeomddakji) |
|---|---|
| Representative | 이상훈 |
| Business registration no. | 413-21-02441 |
| Mail-order business registration no. | 제2026-경기파주-4064호 |
| Industry | Information & communications / Application software development and supply |
| Address | Republic of Korea The full address is available on request. |
| support@ggeomddakji.com | |
| Website | https://www.ggeomddakji.com |