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Validate Chinese ID card and query province, birthday, age, gender, zodiac

Look up retirement age under gradual delayed retirement policy by birth date

Local todo manager with completion tracking, filters, and localStorage

Random cuisine picker to solve food indecision, supports re-pick

Random witty poison chicken soup quotes, copy and share

Tap for merit +1 with sound effect and floating animation, saved locally

转盘，快速做出随机二选一决定，Sélectionner困难症救星

Predict possible and impossible child blood types from parents (with Rh)