NYXELIUM
ANDROID DEV
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/// OFFLINE-FIRST · NO ACCOUNT NEEDED · FREE TO USE

Offline apps. Engineered to be kept

Nyxelium builds small, calm Android tools that work offline and stay out of your way — no account to create, no clutter.

Browse apps ↓ Read the spec
Chrono app icon
Pocket Cult app icon
Mossby app icon
Nuzzle app icon
3 — LIVE ON GOOGLE PLAY
11 — LANGUAGES
100% — FREE TO START
0 — ACCOUNTS NEEDED
Chrono icon
Chrono
Time Tracker · Tools
LIVE ON PLAY
Chrono screen Chrono screen

Stop guessing where your time goes.

A Pomodoro focus timer and full time tracker in one offline app — for freelancers logging billable hours, students structuring study sessions, and anyone doing deep work.

  • Pomodoro cycles
  • Daily & weekly analytics
  • 200+ category icons
  • CSV & calendar export
  • Home-screen widget
  • 11 languages
Get on Google Play
Pocket Cult icon
Pocket Cult
Idle RPG · Simulation
LIVE ON PLAY
Pocket Cult screen Pocket Cult screen

Be the bad guy. Rule from the shadows.

A tongue-in-cheek idle dungeon keeper — build an evil lair, summon a demon army, and crush the heroes who dare to raid it. Your cult works while you sleep.

  • 15 buildings, 6 tiers
  • 10 unique minions
  • Full offline progress
  • Prestige & ascension
  • No forced ads
  • 6 languages
Get on Google Play Visit the dungeon →
Mossby icon
Mossby
Plant Care · Home
LIVE ON PLAY
Mossby screen Mossby screen

Stop killing your houseplants by accident.

A calm plant-care advisor that warns you before a plant lands in a spot that's too dark — or before you pair two plants that shouldn't share a pot.

  • Smart watering schedules
  • Light-aware placement
  • Pairing warnings
  • Zones, pots & catalog
  • Care streaks & history
  • Light & dark themes
Get on Google Play
Nuzzle icon
Nuzzle
Pet Care · Lifestyle
IN DEVELOPMENT
Nuzzle screen Nuzzle screen

Keep every pet healthy, gently.

The calm, offline way to stay on top of feeding, meds, grooming and vet visits — with health flags that quietly surface what needs attention.

  • Auto-scheduled reminders
  • Per-pet health timeline
  • Weight tracking
  • Household calendar
  • Works offline
Follow along →

/// PRACTICAL GUIDES

Use your apps with more intention.

Straightforward field notes on focus, plant care, and idle-game design—written from the problems behind the apps.

Browse every guide →
GUIDE—01 · PRODUCTIVITY How to track time offline on Android Build a useful record of your day without an account or permanent connection. GUIDE—02 · PLANT CARE Build a better houseplant watering routine Use reminders as a prompt to check each plant, not a command to water blindly. GUIDE—03 · GAME DESIGN What makes an offline idle game satisfying? A practical look at progress, meaningful upgrades, and prestige loops.

/// THE SPEC

Every app ships against the same contract.

Six requirements, checked before every release. If a feature breaks one of them, the feature doesn't ship.

REQ—01
Offline-first
Core features work without a connection, and the content you create stays on your device.
REQ—02
No account needed
No sign-up, no login — open the app and start. Free versions show ads and use optional, consent-based analytics.
REQ—03
Zero friction
Open and go. No forced onboarding, no dark patterns, no nagging notifications.
REQ—04
Localized
Fully translated across many languages so the apps feel native wherever you are.
REQ—05
Light & fast
Small downloads, smooth performance, accessible layouts in light and dark themes.
REQ—06
Fair pricing
Free to use, with honest optional upgrades — never a wall between you and the basics.

/// THE STUDIO

One small studio. Built in the open.

Nyxelium builds thoughtful Android apps that respect attention, data, and momentum. Every app is built with Flutter, shaped by real daily use, and refined release after release.

Have feedback or an idea? We'd genuinely love to hear it.

STOREApps on Google Play → CODEgithub.com/lKowalskil → EMAILkowalski.dev07@gmail.com →