🎮 Hobby
Tools for hobbies and creative activities
Dice Roller
Polyhedral dice for TRPG (supports expressions like 2d6+3)
TRPG Dice Pool Probability Calculator
Visualize success distributions and target odds with rerolls and exploding dice
Decision Roulette
A decision roulette where you input options and spin—supports weighted selections and exclusion mode.
Chess Clock
Turn your smartphone into a chess clock. Free web timer supporting sudden death, Fischer, and byoyomi modes
Mahjong Settlement Calculator - Uma & Oka
Automatically calculate settlement points and amounts reflecting Uma, Oka, and rates from base scores. Supports multiple rounds aggregation.
Score Keeper
A free scoresheet that records board game and card game scores by round and automatically calculates totals and rankings
ND Filter Exposure Calculator
Convert shutter speed after attaching ND filter and countdown long exposure timer
Coffee Extraction Ratio & 4:6 Method Timer
A hand-drip coffee ratio calculator that calculates total water amount from bean weight and ratio, guides the pouring schedule for the 4:6 method (Kasuya-style) with a step timer. Also supports contactless gesture control by holding your hand over the camera.