App feature
A bill upload gives Choose My Electric more context than a ZIP code alone. It helps match your current supplier, rate, and usage information so the comparison can be more personalized.
A simple ZIP code search is a strong first step, but it cannot always tell the full story of what you are paying right now. A real bill often contains your current supplier, rate details, utility context, and usage information. That gives the app a better starting point for matching you to other plans.
The website is intentionally limited to light comparison so it stays fast, simple, and search-friendly. Bill upload is an app feature. That separation makes the website useful for discovery while keeping the more advanced workflow inside the iPhone experience.
Many shoppers start on the website to understand the market, then download the app once they want a more precise recommendation. That path works well because it keeps the research step easy while still giving you a stronger tool when you are serious about switching.