Schrödy Lab

Quantum circuits, by hand.

Drag gates onto a circuit, watch the state vector evolve amplitude by amplitude, and export the whole thing as runnable Cirq or Qiskit code. Built for iPhone.

It is a simulator, not a client for remote quantum hardware. Every circuit is computed on your device with exact state-vector mathematics — no account, no server, no queue, no internet connection. The simulation is idealised and noise-free: it does not model decoherence, gate error or readout error.

What it does

Build visually. Drag H, X, Y, Z, S, T, rotation gates, CNOT, CZ and Toffoli onto a circuit grid.
Simulate exactly. A full state-vector simulator computes every amplitude — probabilities and phases, not just measurement counts.
Step through it. Advance one column at a time and watch superposition and interference build up.
Export real code. Every circuit becomes runnable cirq or qiskit Python, ready to copy out.
Start from a preset. Bell, GHZ, uniform superposition and Grover's search are built in.

Free and Pro

Free

No account, no cost

Up to 2 qubits
Full simulation
Step-by-step mode
Cirq and Qiskit export

Pro

USD 4.99 / year · 7-day free trial

Up to 8 qubits
Save and reopen circuits
Toffoli, GHZ and Grover
Everything in Free

Privacy

Schrödy Lab collects nothing. It has no servers, no analytics and no third-party code, and it makes no network connections of its own. Your circuits stay on your device. Read the full Privacy Policy.

Support

Questions, bug reports or feature requests are welcome at eupalaci@gmail.com. Please include your iPhone model and iOS version when reporting a problem.