For licensed amateur radio operators

Know the band before you call CQ

VOACAP-grade path modelling, live PSK Reporter / WSPR / DX Cluster evidence, and an optional AI band advisor — fused into one confidence score per band, right on your wrist or your widget.

Join the TestFlight Beta See what's inside

Now available via TestFlight beta

VOACAP path physics Live evidence fusion Apple Watch companion iCloud private sync No ads · No tracking

Everything in one dashboard

Built for real operating decisions

Every prediction is grounded in physics and live activity, not just a model guessing in the dark.

AI band advisor

An optional AI layer turns your station's data into a plain-English recommendation. Bring your own OpenAI or Anthropic API key — it's stored in your Keychain and never touches our servers, because we don't have any.

Live evidence fusion

PSK Reporter, WSPR.live, DX Cluster spots and the Reverse Beacon Network are combined with your station's grid square to confirm which bands are actually open right now.

VOACAP-grade modelling

Great-circle path geometry, MUF from GIRO ionosonde data, and link-budget estimates using your real antenna gain and transmit power — not a generic lookup table.

Space weather dashboard

Solar Flux Index, planetary Kp, A-index and GOES X-ray flux with automatic Solar Flare and SID alerts when a flare threatens the D-layer.

Apple Watch & widgets

A watch complication and home/lock screen widgets keep your top band recommendation one glance away — synced privately through your own iCloud account.

Smart alerts & QSO log

Get notified when a band opens on your favourite path. A lightweight on-device QSO log feeds the recommendation engine — capped, pruned, and never uploaded.

Illustration of a great-circle propagation path over the globe, fed into the app's AI advisor

How predictions are built

Five layers of evidence, one confidence score

Every band gets a 0–100% confidence rating, colour-coded and scoped to how relevant the evidence is to your station — from Local (within ~250 km) out to Global Context.

Path physics — VOACAP-based great-circle geometry, MUF and link budget.
Ionospheric truth — Real-time foF2 readings from the GIRO ionosonde network.
Live activity — WSPR, PSK Reporter and DX Cluster spots near your grid.
Space weather — NOAA/SWPC solar flux, Kp/A-index and X-ray flare data.
Your own reports — Operator Band Checks and recent QSOs sharpen the model in real time.

Your station data stays yours

No developer-run server, no account, no ad or analytics SDK. Your logbook and settings stay on-device or in your own private iCloud — and AI features only run if you supply your own API key.

No ads No analytics SDKs No data sold Keychain-only API keys

Read the full privacy policy →

From the same developer

Other apps from VK4WSG

A couple of other tools built for operators and travellers alike.

QSO Map

See your logbook on the map

Import your ADIF log and watch every contact plotted by grid square on an interactive map — filter by band, mode or date to see exactly where your signal has reached.

Coming soon

PowerMate RV

Size your RV's power system with confidence

Calculate battery runtime, device power draw and inverter sizing for your RV or off-grid setup — model real device loads against your actual battery bank.