Quplane is a gated numerical computing suite: 97 solvers for optimization, filtering, and inference, each shipped with a reference implementation and a correctness gate it must clear before it is callable. Results carry contracts stating exact, tolerance bounded, or heuristic status, and QUBO answers can arrive with optimality certificates (22 of 23 certified on the Mittelmann QUBO campaign set). An auto analyst turns a data file and a plain language question into a chain of solvers that check one another. The engine runs in the customer's AWS account; Quplane holds no customer data.