Robin is a complete design app for axisymmetric solenoid magnets. It allows you to go from a first geometry sketch to field maps, inductance, and harmonic analysis, and it runs entirely on your iPhone or iPad.
Build a magnet from stacked coil sections, each with its own dimensions, turns, and current. A live geometry preview keeps the cross-section in front of you while you iterate, and every project is saved on your device. No account, no cloud — it runs completely offline.
DESIGN
• Create magnets from any number of coaxial coil sections
• Live cross-section preview with real dimensions and true proportions
• Work in mm, cm, m, inches, mils, or feet
• Per-project length units, light and dark theme
FIELD
• Full B(r,z) field maps: Br, Bz, and |B| on a configurable grid
• Fast native solver for interactive recalculation
• Pan and zoom the field slice; adjustable display and resolution
ANALYSIS
• Self- and mutual-inductance matrix for all coil sections
• Coupling matrix and total stored magnetic energy
• Zonal harmonic coefficients for field-quality work
PROJECTS
• Unlimited projects, stored locally with instant switching
• CSV import and export for coil geometries
• A built-in sample project to start from
Robin is built for physicists, magnet engineers, and students who want real magnetostatics in their pocket. The solver is a native C++ compute core validated against closed-form solutions. A full field map takes moments, not minutes.
Everything stays on your device. Robin collects no data and never connects to the internet.
