AMRT Amateur Radio RF Toolkit

Ham antenna & VSWR calculators

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Your amateur-radio bench, in your pocket — and it works completely offline. AMRT brings the calculators and references hams reach for most into one fast, ad-free app. From cutting a dipole in the field to checking SWR in the shack, every answer shows the formula and assumptions behind it. ANTENNAS • Dipole, inverted-V, end-fed half-wave, vertical, J-pole, Yagi, cubical quad, full-wave loop & small magnetic loop • Lengths in metres, feet or fractional inches, with cut lists and diagrams RF & FEEDLINE • VSWR, return loss & mismatch loss • Coax cable loss and power at the antenna • Smith chart impedance matching • dB to power/voltage ELECTRONICS • Ohm's law, reactance, LC resonance, voltage divider • Series / parallel networks • Resistor, capacitor & SMD codes, AWG wire gauge LOCATION • Maidenhead grid square, distance & bearing • Look up your grid from GPS REFERENCE • Q-codes, RST, NATO phonetic alphabet, Morse, band plans MORE • Save calculations into projects and share results instantly • Home-screen widget: your callsign, home grid & UTC clock • Imperial and metric units throughout 100% offline. No account. No ads. Just the tools. Free to use the Dipole calculator — unlock every tool with a single one-time PRO purchase. No subscription. 73!

Ratings & Reviews

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• Units screen shows readable labels (ft, kHz, mW) • Updated tools, calculators and band plans • Home-screen callsign widget refreshes as soon as PRO or your callsign changes • Reliability fixes for purchases, restore and saved calculations • See what's new after each update, and get told when a new version is out

Version 1.1.1

In-App Purchases

The developer, APPRICODE SOFTWARE CONSULTANCY LTD., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    APPRICODE SOFTWARE CONSULTANCY LTD.
    Size
    19 MB
    Category
    Utilities
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    © 2026 Appricode Software Consultancy Ltd.
  • Developer Website
  • Privacy Policy

    • More by APPRICODE SOFTWARE CONSULTANCY LTD.

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