Further is our new learning network. Coder is now a legacy product, you can continue to use it, but we will not be developing it anymore.
Further is a web service and so will run on any computer. Students using Further can push code (where required) to connected pi-top devices.
Further integrates with Clever / Google Classroom, making it easier for teachers to get started.
Further also makes it easier for groups of students to collaborate on challenges, and for teachers to assess each student's progress.
Further allows you to include third-party interactive content, such a Scratch projects, within challenges.
Coder is an application that runs on pi-top  and  devices. You cannot run coder on Mac, Windows or ChromeOS.
Coder is great for teaching beginner to intermediate computer science using the pi-top , however it is not appropriate for non coding related education. Further will allow learning around a wide range of subjects and is not restricted to computer science.