Which Tools Are Best for Startup Booted Financial Modeling?

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There are many tools available for building financial forecasts, so I'm curious what experienced founders recommend for Startup Booted Financial Modeling. Some people use Excel, while others prefer Google Sheets or specialized financial modeling software. If you've built startup financial models before, which tool provided the best balance between flexibility, accuracy, and ease of use? I'd also appreciate any templates or best practices you found especially helpful.