A such application doesn't really exists. You cannot boost your connection speeds over the one you pay for in your plan with your ISP. The only way you can have the full speed you pay for is to be on a wired connection (on this modem or router) or be on the WiFi, with no interferences on the network and really close to the access point (AP, router, repeater, etc.) If the people you share your connection with over the WiFi wants better speeds, they should get closer to the WiFi, connect to the 5GHz band (if your router have dual band, 2.4GHz and 5GHz), you should setup an environment with as little interference as possible, etc. What are your speeds on a wired connection? Run a test on SpeedTest.net and share the result here.