Addition and Subtraction is a browser extension that helps you practice simple addition and subtraction expression. It is like a quiz extension.

FEATURES
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- Quick random expressions
- Easy, Medium, Hard, and Custom modes
- Addition, Subtraction, or random operations
- Save user settings to the cloud for access from other devices. 
- Leaderboard
- Dark/Light theme
- Open-source 

if you need more feature on this app, highly requested to create an issue on our GitHub repository https://github.com/biplobsd/as/issues tab.

Read more: 
https://github.com/biplobsd/as/blob/main/README.md
https://biplobsd.me/apps/view/as.md