ロト7当選チェッカー is an Android application developed by granky that specializes in quickly checking Loto7 (ロト7) lottery results. With this app, you can easily input your purchased numbers and quickly check for winning results during the announcement day.

One of the main features of this app is that it updates the results quickly, usually within 15 minutes after the announcement is made on Mizuho Bank's website. You can register up to 20 purchase information and check past results. The app also allows you to check past winning numbers without registering your purchase information. Additionally, you can easily access the latest Loto7 numbers on Mizuho Bank's website. The app is available for free and is compatible with all Android devices running version 5.0 or higher.

Regarding security, the app requires full network access and displays network connections. These are used to update winning numbers and to display advertisements.

Please note that the app uses the winning numbers collected independently from Mizuho Bank's Loto7 page, and therefore, does not guarantee the accuracy of the results.