# Ferrum: Stud Finder & Metal — No timers. No subscription.

> No timers. No subscription. (iPhone/iPad app by 55DIGITS LLC.)

- Source: https://appshunter.io/ios/app/ferrum-stud-finder-and-metal/id6802032570 (this page in markdown: same URL + `.md`)
- Developer: [55DIGITS LLC](https://appshunter.io/developer/6790451449)
- Category: Utilities, Productivity
- Price: $4.99
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-08-31
- Data updated: 2026-09-08

## What is Ferrum?

Ferrum is an honest, calibrated measuring instrument built on your iPhone's
magnetometer. It starts measuring the second you open it — continuously, with
no timers, no upgrade prompts, and no subscription.

WHY FERRUM EXISTS

Wall scanners on the App Store interrupt your measurement to sell you
something, charge weekly for a sensor your phone already has, or dress up the
Earth's own magnetic field as a "detection". Ferrum does none of that. You pay
once. There are no ads, no accounts, and the app never connects to the
internet.

CALIBRATED, NOT GUESSING

The Earth's magnetic field runs 25-65 µT, and your phone adds a bias of its
own. Ferrum measures that background first, then shows you only the change —
the number that actually means something. Recalibrate any time with one tap.

FOUR MODES, ONE ENGINE

- Stud - find the screws that hold a wooden stud in place, with a narrow
  threshold tuned for sharp local peaks.
- Wire - find live AC wiring by its mains signature, not by field strength,
  so a steady piece of steel never masquerades as a live cable. Works on both
  50 Hz and 60 Hz mains, with no setting to choose.
- Metal - maximum sensitivity to ferromagnetic mass: steel framing, pipes,
  rebar.
- Recovery - for lost things. MAX HOLD keeps the peak reading and the audio
  is at its loudest, for rings in the grass, buried boundary pins and time
  capsules.

Geiger-style ticks speed up as you close in, with haptic feedback in the same
rhythm so you can work in a noisy room or with the sound off. The screen stays
awake while you measure.

HONEST ABOUT PHYSICS

A magnetometer senses ferromagnetic metal — iron and steel — and the changing
fields of live wiring. It cannot see gold, silver, copper, aluminum or
plastic, and it cannot tell you how deep something sits. Ferrum says so
plainly on its Learn screen, along with how to actually find a wooden stud
(you find the screws), why readings drift, and a trick for tracing a circuit
that is switched off. No fear content. No invented "risk levels".

PRIVACY

Data Not Collected. No analytics, no identifiers, no network access at all.

Not a substitute for a professional scanner where safety matters. Always
verify before drilling.

## Is Ferrum safe?

Not enough ratings yet to assess Ferrum.

## Is Ferrum legit?

Ferrum: Stud Finder & Metal has limited verification signals. The AppsHunter Legitimacy Score for Ferrum is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-09-01

No release notes.

## More apps by 55DIGITS LLC

- [TwoNite: Couples Dare Game](https://appshunter.io/ios/app/twonite-couples-dare-game/id6790451447)
- [Partus: Pregnancy Wheel](https://appshunter.io/ios/app/partus-pregnancy-wheel/id6796027980)

All apps by 55DIGITS LLC: https://appshunter.io/developer/6790451449

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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 2026-09-08.*