# Robin: Solenoid Designer — Magnet design and field maps

> Magnet design and field maps (iPhone/iPad app by Little Beast Software B.V..)

- Source: https://appshunter.io/ios/app/robin-solenoid-designer/id6799057947 (this page in markdown: same URL + `.md`)
- Developer: [Little Beast Software B.V.](https://appshunter.io/developer/6799057949)
- Category: Education
- Price: $3.99
- Age rating: 4+
- Requires: iOS 17.0 · 9 MB
- Languages: American English
- Released: 2026-08-28
- Data updated: 2026-10-04
- User reviews in markdown: https://appshunter.io/ios/app/robin-solenoid-designer/id6799057947/reviews.md

## What is Robin?

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.


## Version history (last 1 release)

### 1.0 — 2026-08-28

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-04.*