Ket Steps
A quantum workpad for students.
Built for quantum information theory coursework. Create kets, bras, operators, and scalars, compute results with full type and basis checking, annotate your reasoning in markdown with inline LaTeX, and copy results as LaTeX — all on iPhone, iPad, or Mac.
How It Works
Pick from the library — or define your own
Tap the library to insert common objects like |0⟩, |+⟩, H, Bell states, and more. Or define your own custom kets, bras, and operator matrices from scratch. Each line immediately shows both bra-ket notation and the matrix or vector form side by side.
Compute, and see the result alongside the expression
Select objects from your workpad and apply an operation — the app validates spaces and bases, then shows the input expression and its computed result on the same card.
⟨0|X|0⟩ = 0Copy results as LaTeX
Copy any line's computed result as LaTeX or Unicode — ready to paste directly into your document or problem set.
Document Your Reasoning
The Hadamard gate maps the computational basis to the Hadamard basis. Recall that |+⟩ = (|0⟩ + |1⟩) / √2, so applying H to |0⟩ picks out the first column of the matrix.
— Inline $formula$ and block $$formula$$ LaTeX rendered natively. Full markdown: headings, lists, blockquotes, code blocks.
Add comment lines anywhere in your workpad to explain steps, state assumptions, or structure a derivation. Markdown with inline and block LaTeX, rendered right alongside your calculations.
Features
Type-Safe Quantum Objects
Kets, bras, operators, and scalars are distinct types. Invalid operations simply aren't offered.
No Silent Errors
Basis mismatches and space violations surface as clear, readable messages — never silently wrong results.
Built-In Library
One tap to insert |0⟩, |1⟩, |+⟩, |−⟩, X, Y, Z, H, Bell states, and more common objects.
Tensor Products
Build multi-qubit states like |0⟩⊗|1⟩ with factor structure always preserved — never silently flattened.
LaTeX Copy
Copy any line's result as LaTeX or Unicode — paste directly into your document.
Privacy First
All data stays on your device. No accounts, no sync, no tracking.
iPhone, iPad & Mac
Coming soon