# Qiskit

IBM's open-source Python SDK for building and running quantum circuits on simulators and real hardware.

Qiskit is the most widely used open-source quantum computing SDK, maintained by IBM. It covers circuit construction, transpilation, primitives (Sampler and Estimator), and execution on local simulators or IBM Quantum hardware through the Qiskit Runtime service. A large ecosystem of community packages adds application libraries for chemistry, optimization and machine learning.

Price: Free, open source (Apache 2.0). Site: https://www.ibm.com/quantum/qiskit.

Also on the [web page](https://quantumcompanies.fyi/apps/qiskit).