Flash mental arithmetic practice app In addition to the easy, normal, and difficult modes, there are also custom modes. It can also be a brain training to improve mental arithmetic - More info on Flash mental arithme...

It is a simple notepad app. You can easily use it as a handwritten memo, drawing, scribbling, writing communication, as a substitute for a notebook, etc. 16 kinds of colors Create and view multiple pages It is also possible to change the thickness of the pen You can also save and load the drawn image... - More info on HandwrittenNote Chan...

It is a simple referee application that can be used in sports etc. It can sound a whistle, can be used for sports refereeing, training, when you want to call something, pranks, etc. You can put out four kinds of cards of yellow card, red card, orange card, green card in full screen. It may be interesting to use it as a referee in sports games or when playing with friends. It is designed to be e... - More info on Referee Yellow card,...

BGM collection app that can be used when there is no sound and you are lonely Contains music box-style music When doing something, doing an event, playing with friends, etc. Please use it when you want to play music anyway. It's a song that makes you feel calm when you want to relax, when you sleep. BGM by OtoLogic (CC BY 4.0)... - More info on Music Box style BGM...

You can record spoken words and play them backwards Try using it to practice speaking backwards and conversing Play back the words you normally speak in reverse to check, and try recording them in reverse to see if they sound correct. You may be able to play it as a party game with your friends - More info on Simple Reverse Voice...

An app with a simple function to convert photos and images to retro sepia tones. By applying the sepia effect, you can create unique images or artistic, vintage-style photos. Perfect for those who want nostalgic-looking images or sepia-toned pictures. Your images will resemble photos taken with a film camera, vintage camera, or retro camera. Ideal for anyone seeking quick and easy image editin... - More info on Simple Sepia Photo...

A simple camera that can take black and white binary images. You can take unique black and white images or tasteful art-like images. Let's take photos with interesting effects This is for people who want to take easily edited photos. - More info on Simple Black And Whi...

A simple drawing app. You can easily use it to draw pictures, take handwritten notes, doodle, etc. There are 16 different colors to choose from You can also change the thickness of the pen Multi-touch support allows multiple people to draw at the same time You can also save the images you draw - More info on Simple Drawing Pad...