Offline-first · iOS 15+ · 35 languages

No signal,
no problem.

The professional ultrasonic testing app for field weld inspection — AWS D-Rating, DAC/TCG curves, 3D beam simulation, and OCR parameter capture. 100% on-device. No cloud. No upload.

Download for iOS Explore Features →
  • 9 UT Calculators
  • 3D Beam Simulation
  • 0 B Data Uploaded
  • 100% Offline Ready
NDT Master 3D beam simulation with A-scan waveform
Core capabilities

Built for the field,
not the office.

Every feature is designed to remove friction between you and the answer. From scanning a probe's display to walking out of the field with a finished report.

3D beam simulation with sound path L1/L2, spread, and A-scan
#1 Most Useful

See the beam, not just numbers.

A real-time 3D sound path that updates the moment you change probe angle, frequency, or wedge delay — alongside the live A-scan waveform, spread angle, and near-field length. Free for everyone, no unlock required.

  • Real-time path L1 / L2 / L3
  • A-scan waveform overlay
  • Beam spread & near-field calc
  • 60° wedge default for weld inspection
AWS D1.1

AWS D-Rating, step by step.

Walk through indication length, amplitude, and D-value with built-in AWS D1.1 and ASME terminology — Clause 8 logic on-device, ready when the call goes out.

AWS D-Rating calculator output
DAC / TCG

Build reference curves on site.

Plot DAC and TCG curves from your reflector points and get a usable gain table in seconds. No laptop, no spreadsheet — your iPhone is the calibrator.

DAC/TCG curve with reference points
Field workflow

Locate flaws faster.

Type a sound path, get depth and projection instantly. The 3-number answer most field workflows are based on, surfaced in one tap.

Flaw location calculator with depth, projection, sound path
OCR Capture

Scan the screen. Parameters fill in.

Point at the probe's instrument display and let OCR map velocity, MHz and dB into the parameter card in seconds — fewer typos, faster setup.

OCR capture mapping instrument display into parameters
Material library

Steel, stainless, aluminum — preset.

Built-in material presets for the metals you'll meet on site. One tap to load velocity and acoustic properties; custom materials supported.

Material library with steel, aluminum, stainless presets
A typical workflow

From reading to report,
in one app.

  1. 01

    Set up the probe.

    Pick a material preset, dial angle, frequency. The 3D beam shows you exactly where L1 and L2 will land.

  2. 02

    Scan & identify.

    Use the OCR scanner to read values off your instrument, or enter them by hand. Flaw location returns depth and projection immediately.

  3. 03

    Apply the code.

    AWS D-Rating and DAC/TCG wizard steps you through the assessment with the right terminology on-screen.

  4. 04

    Export & archive.

    Generate a PDF or CSV report right on the device. Hand it to the client, file it in your records, done.

9 UT calculators

From wavelength to TOFD PCS,
all included.

Five calculators are free forever. The full toolkit unlocks with a single one-time purchase.

Wavelength

λ from frequency & velocity.

Free

Near Field

Fresnel zone length, N value.

Free

Beam Spread

Divergence angle & footprint.

Free

Flaw Location

Depth & projection from sound path.

Free

Snell's Law

Critical angle & refraction.

Free

TOFD PCS

Probe center separation by depth.

Pro

dB Calculator

Reference-level dB math.

Pro

AWS Wizard

D1.1 / ASME indication rating.

Pro

DAC / TCG

Reference curves & gain table.

Pro
Privacy

No account. No cloud.
No upload.

NDT Master is 100% on-device. There is no backend, no telemetry, no analytics — your inspection data never leaves your iPhone unless you choose to export it.

  • App Store Data Not Collected. Verified and labeled on the App Store product page.
  • Works with zero signal. Designed for the field — no internet required, no login.
  • No account. No tracking. Install, open, work — there's nothing to sign up for.
  • Your inspection data, your device. Export only when you say so.
App settings showing offline-first design
In the app

Eight screens,
zero empty states.

3D beam simulation
3D beam + A-scan
Flaw location
Flaw location
Offline settings
Offline-first settings
Tool dashboard
Pro workflow dashboard
Snell law calculator
Snell & refraction
Beam spread
Beam spread
Material library
Material library
Export report
Export to PDF / CSV
Pricing

One purchase.
No subscription.

Try the full Pro toolkit free for 7 days. Then unlock everything with a single one-time payment. No recurring fees, no auto-renew.

Free

$0

  • Wavelength, Near Field, Beam Spread, Flaw Location, Snell's Law
  • 3D beam simulation
  • Material library
  • All 35 languages
  • iPhone & iPad
Most popular

Pro

$9.99 one-time

  • Everything in Free, plus:
  • AWS D1.1 / ASME Wizard
  • DAC / TCG curve builder
  • TOFD PCS calculator
  • dB Calculator
  • OCR parameter mapping
  • PDF & CSV export
  • 7-day free trial included
Start 7-day trial

Available on iPhone & iPad running iOS 15.0 or later. One-time unlock, no subscription.

Get it on the App Store

Built for the
next inspection.

Open the App Store, search "NDT Master", or use the direct link.

Download on the App Store

App Store ID: 6762549446 · iOS 15.0+ · iPhone & iPad

NDT Master on iPhone
FAQ

Frequently asked.

Does it work offline?

Yes — fully. NDT Master runs entirely on your iPhone. No account, no cloud, no upload. App Store privacy label: Data Not Collected.

Is it a subscription?

No. Pro is a single one-time purchase ($9.99). A 7-day free trial is included. No auto-renew, no recurring fees.

Which codes does it support?

AWS D1.1 indication rating (Clause 8) and ASME terminology. DAC/TCG follows standard reference-block workflows.

Does it support iPad?

Yes — a native iPad layout with the same screens, optimised for the larger display.

How many languages?

35 languages, including Arabic, Hindi, Hebrew, Chinese (Simplified & Traditional), Japanese, Korean, Spanish, Portuguese, Russian, German, French, and many more.

Can I export inspection reports?

Yes — export to PDF or CSV right on the device. Files stay local until you choose to share or print.

Support & contact

Still need help?
Or have feedback?

Questions about a calculation, a bug report, or a feature request — email us and we'll get back to you. We read every message.

Email us directly st67891@gmail.com

For fastest help, include your device model, iOS version, and (if reporting a calculation issue) the input values you used.

  • Bug reports & calculation issues
  • Feature requests & code coverage
  • Purchase & trial questions