iPhone Screenshots


YouLuck is an app solely built to answer your question: "How many times do I have to do THIS in order to get what I want?"

For example, you might have found yourself in such situations like:

- "How many lotteries do I have to buy to win if chances are 2 out of 100,000?"
- "How many times do I have to kill these monsters to drop the super-uber-weapon-of-your-favorite-game if the drop rate is said to be 1.8%?"
- "How much do I have to pay for In-App Purchase to get your favorite cards/monsters/items in random drop systems of freemium games?"
- "How many drops can I expect when I try 100 times for drop rate of 5.8%?"

This is exactly when this app comes in handy. YourLuck can give you the best answer in a matter of seconds and a couple of swipes! Learn how to use by looking at screenshots, it's super easy!

*This app is completely free without any advertisements or feature restrictions.

What’s New

Version 1.1.2

- Can now calculate up to 10,000 trial counts, up from 1,000.
- iPhone 6 and iPhone 6 plus optimization was planned but suspended. I have to rework the whole UI of this app because the current one doesn't fit much for bigger screens. Sorry for inconvenience.


Masashi Ono
2.2 MB

Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Japanese

Age Rating
Rated 4+
© 2014 Masashi Ono


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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