A: Hello! That's a good question.

robotalp is a monitoring tool, focus on Uptime Monitor services. Modular is an All-in-one tool for managing WordPress sites, including features like:
- Uptime Monitor
- Cloud backups
- Centralized WordPress updates, plugins and theme installation, activation...
- Vulnerability and security checks
- Client reports with Google Analytics, Search Console, PageSpeed and WooCommerce integrations
And so on.

So as you can see, Modular aims to help web professionals with everything related to wait maintenance. Not just Uptime Monitor.

Hope this clarifies it :)