LY4A DX Reminder - DX cluster monitoring for Android, Windows and Mac
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LY4ADX

LY4A DX Reminder

For radio amateurs — Android, Windows and Mac

Tell it which callsign you are waiting for, on which bands and in which mode. From then on it keeps watching five DX clusters in the background and raises a real alarm the moment that callsign shows up — even while your phone is silenced or your window is closed.

  • Five sources at once — DXScape, DXSummit, DXHeat, PSK Reporter and Reverse Beacon
  • Band and mode kept apart — 20m CW and 40m SSB never mix, and CW means real CW only
  • 160m to 70cm — all HF bands including 60m, plus 6m, 2m and 70cm
  • Five modes — CW, SSB, FT8, FT4 and RTTY
  • Alarm even on silent — plays on the alarm channel and wakes a locked screen; on the desktop it keeps running from the tray
  • Stop, snooze or delete — straight from the notification
  • Checks every 1, 5, 10 or 30 min — keeps running in the background and after a reboot
  • 15 languages — English, Lithuanian, Polish, Italian, Ukrainian, Czech, Portuguese, Japanese and more

DXSCAPE · DXSUMMIT · DXHEAT · PSKREPORTER · REVERSEBEACON

Download Android APK
Version 3.4 (build 25) · 2.2 MB
Requires Android 8.0 or newer · free
Download Windows x64 software
Version 1.4.0 · 95.1 MB
Installer for Windows 10/11 64-bit · free
Portable version — no install · 93.8 MB
Download macOS software
Version 1.4.0 · 104.8 MB
For macOS 12 or newer · free
Portable version — no install · 99.6 MB
131 downloads LT 47 US 19 DE 7 FR 6 IT 6 ES 5 UA 3 HU 3 LV 3 GB 3 PL 3 RO 3 SE 3 GR 2 HK 2 SK 2 EG 2 CA 1 NL 1 PT 1 BE 1 BR 1 KR 1 IN 1 MX 1 HR 1 AR 1 SG 1 RS 1

The app is free and has no ads. If it helped you catch a new one, you can support the work — any amount, or your own.

Donate via PayPal

The app is not on Google Play, so your phone will ask you to allow installing from this source. Allow notifications on first launch — without them the alarm cannot appear. On macOS the app is not signed by Apple yet, so open it the first time with right-click → Open.

What's new

Version 3.4 (Android) and 1.4 (Windows, macOS)
  1. Fifteen languages. Added Polish, Italian, Ukrainian, Czech, Brazilian Portuguese, Japanese, Latvian, Estonian and Hungarian, alongside English, Lithuanian, German, French, Russian and Spanish.
  2. The language is the app's own. Pick it in the app or on the title screen; it does not depend on the phone's system language.
  3. Portable versions. The Windows and macOS builds are now also offered as a no-install download, under each button.
Version 3.3 (Android) and 1.3 (Windows, macOS)
  1. New band: 60m. Every HF band from 160m to 10m is now covered, plus 6m, 2m and 70cm.
  2. New mode: FT4. It is told apart from FT8 by its own channels, so a reminder set for one does not fire on the other.
  3. PSK Reporter works as it should. Its reception reports are published in batches and are always a few minutes old, and the app used to discard them as stale — so the source looked silent while its data was fine.
  4. One alarm per callsign, band and mode. A single appearance on the air is reported by dozens of spotters; you now get one alarm for the newest of them.
  5. You choose how often the same station may ring again — on every new spot, or every 1, 5, 10, 30 or 60 minutes. It applies to that one callsign, band and mode: any other still rings at once.
  6. The alarm is easier to stop. Stop and Snooze are buttons on the notification itself, visible without expanding it, and closing the full-screen alarm with Back now stops it too.
  7. A warning if notifications are turned off. Until now the app kept watching and alarming with nothing to show for it.
  8. Newest spots are at the top of the list, and the Android download is 2.2 MB instead of 19 MB.

Your callsigns and reminders survive the update. The Windows and macOS versions have the same changes.

How to install

Pick your device. None of this is needed twice - only on the first install.

Android phone or tablet
  1. Tap Download Android APK. Your browser may warn about this file type - allow it.
  2. Open the downloaded file. Android will ask to allow installing apps from this source: turn it on for your browser, then go back.
  3. Tap Install, then Open.
  4. On first launch allow notifications - without them the alarm cannot appear.
  5. If the app asks for Alarms & reminders, allow that too, otherwise checks can be delayed by the system.

The app is not on Google Play, which is why the phone asks. It needs no account and collects nothing.

Windows 10 / 11 (64-bit)
  1. Download the .msi file and run it.
  2. Windows may show "Windows protected your PC". Click More info, then Run anyway - the app is not signed with a paid certificate, and that is all this warning means.
  3. Follow the installer. You get a Start menu entry and a desktop shortcut.
  4. Closing the window does not stop it: the app keeps watching from the system tray. Quit it from the tray menu.
Mac (Apple Silicon)
  1. Open the downloaded .dmg and drag LY4A DX Reminder into Applications. Eject the disk image.
  2. macOS 12-14: in Applications, right-click the app and choose Open, then Open again in the warning. A normal double-click gives no Open button.
  3. macOS 15 (Sequoia) and newer: try to open it, then go to System Settings → Privacy & Security, scroll down and click Open Anyway.
  4. If it says "damaged and can't be opened", the file is fine - that is how macOS describes an unsigned app. Open Terminal and paste:
    xattr -dr com.apple.quarantine "/Applications/LY4A DX Reminder.app"

Only needed once. Signing the app would remove the warning but requires a paid Apple developer account.

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