Web developers waste hours testing how sites behave across different browsers and devices. Existing tools either lack precision or are too complex.
Create a developer tool that combines user-agent switching with viewport controls, network throttling, and plugin simulation. Package as both extension and standalone app.
Sell to agencies and in-house teams through team licenses. Offer cloud recording of test sessions for collaboration.
Start with core rendering engine simulation, then add progressive enhancement features based on early feedback.
Risk comes from browser vendors potentially building similar native tools.