Altium Develop sums itself up as "Design on your desktop. Collaborate in the cloud." The subscription includes one Altium Designer author seat, a shared workspace for projects, libraries and collaboration, unlimited workspace users for review, commenting, task management and BOM access, and ECAD-MCAD co-design. Teams above five authors are pointed at Altium Agile instead.
In Altium you draw the schematic, set up the stackup and rules, and place and route every part yourself. Altium Designer is a Windows application; its system requirements recommend 64-bit Windows 11 and a capable graphics card.
Cherry Blossom starts from a sentence instead. You describe the board, an agent writes it as tscircuit code in a cloud sandbox and builds it, and you see the schematic, layout, 3D view and BOM in the browser. Footprints come from real part data and a verification gate checks every edit against manufacturing rules. For a sensor board, a breakout or a microcontroller board, that gets you from idea to fab files far faster than drawing it by hand.