A calculator with 3D numbers, skins, materials, limited drops, a currency converter and a secret skin. Offline, no ads.
ProductivityDart · HTMLGitHub @ornobaadiOnlineOwner unconfirmed
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Math, but make it physical. A calculator with extruded 3D numerals, tactile motion, and a design worth opening every day.
Taken from the repository README
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Read the full README ↗Math, but make it physical.
PopCalc is an Android calculator with sculpted 3D numerals, tactile haptics, musical sound effects, hand-crafted skins, materials, two limited-edition drops with hidden scenes, a live currency converter and one secret skin you have to earn.
0.1 + 0.2 = 0.3(1 + 0.055 ÷ 365)^365 answers instantlyEach skin restyles the whole app: numerals, keys, sheets, celebration and status bar.
| Skin | Style | Background | Accent | Tier |
|---|---|---|---|---|
| Charcoal | Dark, white numerals, amber operators | #141414 | #FFA000 | Free |
| Marigold | Sunny gold and vermilion | #FFAE00 | #D61800 | Free |
| Blueprint | Cyanotype paper, hollow line-drawn numerals | #0B3C8C | #FFD23F | Free |
| Matcha | Sage paper, ink and terracotta | #DDE4D0 | #A8431F | Pro |
| Frost | Nordic ice, navy numerals | #E8EFF5 | #BF360C | Pro |
| Velvet | Deep wine, cream and rose gold | #3A0A1B | #E8A87C | Pro |
Limited drops (until 11 January 2027): Mirage, living dunes under a sky that follows your clock, and Reckoning, a doomsday clock on your phone's own time. Each has its own film-style sounds, haptics and a hidden scene to find. $2.99 each or both in the Dunesday bundle for $4.99; yours for good once bought.
Pro skins and the five materials (Chrome, Glass, Wood, Neon, Mechanical: a look with its own sound and haptics) are one-time purchases through Google Play, singly or all together in the Everything bundle. Nothing needed to do math will ever be locked.
PopCalc is on Google Play: https://play.google.com/store/apps/details?id=com.ornobaadi.popcalc
Feedback and feature ideas are welcome in Issues.
Multiply and divide come before add and subtract. Operations at the same level run left to right.
1 + 2 × 3 → 7
8 ÷ 4 + 2 → 4
| Input | Meaning | Example | Result |
|---|---|---|---|
a + b% | a + (a × b / 100) | 1024 + 5% | 1075.2 |
a − b% | a − (a × b / 100) | 200 − 15% | 170 |
a × b% | a × (b / 100) | 80 × 25% | 20 |
a ÷ b% | a ÷ (b / 100) | 50 ÷ 25% | 200 |
b% | b / 100 | 12% | 0.12 |
a% ± b% | percentages add | 50% + 10% | 0.6 |
| Case | Behaviour |
|---|---|
| Divide by zero | Shows a joke ("CAN'T DIVIDE BY ZERO" and friends) with the plain reason underneath; the expression stays editable |
| Consecutive operators | The latest operator replaces the previous one |
| Leading zeros | 007 becomes 7 |
| Very large results | Scientific notation beyond 15 significant digits |
| Trailing zeros | 2.50 shows as 2.5 |
Repeated = | Ignored, so no duplicate history entries |
lib/
├── core/
│ ├── engine/ # Pure-Dart math: Expression, Parser, Evaluator, Formatter
│ ├── app_icon/ # Home-screen icon choices (Android launcher aliases)
│ ├── audio/ # Sound packs (flutter_soloud)
│ ├── haptics/ # Native Android haptics via MethodChannel
│ ├── storage/ # Settings and history
│ └── theme/ # Skin colour tokens
└── features/
├── calculator/ # Controller, 3D numeral painter, keypad, animations
├── history/ # History sheet
├── settings/ # Skin picker and preferences
└── splash/
decimal package, with no Flutter imports in the enginetool/generate_sounds.pytool/generate_app_icons.pyflutter pub get
flutter test
flutter run
Release builds:
flutter build appbundle --release
flutter build apk --release
| Android | Supported |
| iOS | Planned |
| Orientation | Portrait (scientific mode can rotate to landscape) |
| Network | None |
| Data collected | None (privacy policy) |
PopCalc is not affiliated with Google, Apple or Casio.