VESPER

Evening tarot app in Flutter

A card for every evening. Ask a question, hold the deck to shuffle, lift three cards from a fan and seal the reading in your Book with that night's moon.

Stack: Flutter 3.47, Riverpod, go_router
Runs on: iOS and Android
Screens: 10, plus launch and splash
Languages: English and Mongolian
Tests: 19 passing, 0 analyzer issues
Code: 82 Dart files, no comments

Card art from the 1909 Rider Waite Smith deck and moon photo by NASA, both public domain. Fonts under the OFL

Watch it run

Filmed from the real app, beside its real code.

Nine card backs open into a hand fan and The High Priestess turns face up
Hold the deck and it riffles while a gold ring fills
The fan follows your finger on springs and each card lifts as you pass
A drawn card flies along a dotted path into its slot
The reading turns the cards face up one by one
Tonight's moon stamps the Book page with a ripple
Switch to Mongolian and every card, date and reading follows

Every screen

Tonight
Ask
Draw
Reading
Card
Kept

Read the code

Real VESPER code, straight from the app.

draw/presentation/widgets/fan_card.dart

class FanCard {  FanCard(this.id, {required this.target});  static const pivot = Offset(195, 1150);  static const radius = 546.0;  static const reach = 46.0;  static const width = 100.0;  static const spacing = 3.5;  final int id;  double target;  double angle = 0;  double lift = 0;  double _spin = 0;  double _rise = 0;

5class FanCard {6  FanCard(this.id, {required this.target});78  static const pivot = Offset(195, 1150);9  static const radius = 546.0;10  static const reach = 46.0;11  static const width = 100.0;12  static const spacing = 3.5;1314  final int id;15  double target;16  double angle = 0;17  double lift = 0;18  double _spin = 0;19  double _rise = 0;2021  CardPose get pose => CardPose.onArc(22    pivot: pivot,23    radius: radius + reach * lift,24    degrees: angle,25    width: width,26  );2728  bool step(double dt, {required bool hovered}) {29    _spin += (-170 * (angle - target) - 19.5 * _spin) * dt;30    angle += _spin * dt;31    final aim = hovered ? 1.0 : 0.0;32    _rise += (-320 * (lift - aim) - 27 * _rise) * dt;33    lift += _rise * dt;34    return (angle - target).abs() > 0.005 ||35        _spin.abs() > 0.01 ||36        (lift - aim).abs() > 0.002 ||37        _rise.abs() > 0.01;38  }

VESPER

$10.99