A simple vocabulary book for toddlers and elementary school students to practice addition, subtraction, and multiplication. The date, the time it took to solve, and the accuracy rate are recorded in the app so that you can look back on your progress.
You can also create your own wordbook from a CSV file. I can't do a confirmation test here, but it has a stopwatch function, so I think it's easy to remember if you use it while measuring the time.
＜App introduction page＞
https://shionikki.com/%e3%82%b7%e3%83%b3%e3%83%97%e3%83%ab%e3%81%99%e3%81%8e%e3%82%8b%e8%a8%88%e7%ae%97%e3%82%a2%e3%83%97%e3%83%aa%ef%bc%88%e7%a2%ba%e8%aa%8d%e3%83%86%e3%82%b9%e3%83%88%e3%82%82%e3%81%a7%e3%81%8d%e3%81%be/
I would be happy if you could use it for adult brain training too ^^