Ionaut — Ham Radio
HF propagation & DX tools
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Ionaut is a free companion for radio amateurs — the whole shack in one app, with no account, no ads and no tracking.
PROPAGATION & SPACE WEATHER
- Real VOACAP forecasts, band by band and hour by hour, from your QTH to any continent or a specific callsign
- Live space weather from NOAA (solar flux, K-index, solar wind, X-ray)
- D-layer absorption (D-RAP), a live ionosonde (foF2/MUF, GIRO), history graphs and solar images (SDO/SOHO)
DX & ACTIVITY
- Live spots (PSK Reporter) and the worldwide DX cluster
- Watcher: push alerts on a DX-cluster match
- Callsign lookup — country, zone and callbook
SKY
- Satellite passes incl. QO-100 and GNSS
- Moon / EME with azimuth, elevation and phase
- Azimuthal map with the grey line and aurora; world sun times
OPERATING
- Band plans by country and licence class
- Contest calendar (HF & VHF)
- Nearby repeaters with map and compass — including the Gulf and Oman
TOOLS
- Antenna length, SWR, coax loss, dB/power, Ohm's law, Maidenhead locator and bearing
LEARN (for newcomers)
- Q-codes, phonetics, RST, modes, antennas, the ionosphere, cables & connectors and a D-Star unit
- A CW (Morse) trainer using the Koch method with spaced repetition and progress tracking
Available in 46 languages. No account, no ads, no tracking.
Ionaut is and stays free. If you'd like to support the project: ko-fi.com/reinerklohn
73!
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Sporadic-E — new module
Shows where Es clouds are standing right now. Three readings sit side by
side and are deliberately not stirred into a single number, because they
say different things: what was actually reported in the past hour, what
the ionosondes measure, and what the season would lead you to expect. Real
reports beat any calculation — the sonde only decides where nobody has
been on the air.
Reports on 2 m and 4 m only count as Sporadic-E if a 6 m cloud stands at
the same place and time. An E layer that carries 144 MHz carries 50 MHz
easily; the reverse does not follow. On 10 m the result is cross-checked
against the F2 layer, so an F2 opening is not mistaken for Sporadic-E.
Formula reference in the calculator
The official German formula reference for the amateur radio examination,
complete and properly typeset rather than photographed: fractions as
fractions, roots with a radical bar, subscripts where they belong. From
every section you jump straight into the matching calculator. Reproduced
by permission of the Bundesnetzagentur.
Widgets rebuilt
Every view has been redesigned from scratch and now follows one shared
layout. New: Sporadic-E with a radar view centred on your own location,
and a DX view showing every world region at once, sorted by where you can
reach right now. Space weather gives the space to the bands instead of two
bare numbers, and Grayline draws a 24-hour day/night strip. Large widgets
are supported for the first time.
DX cluster with history
The spot list used to reach back about twenty minutes. It now covers
close to three hours.
Licence classes
The per-country notes have been reviewed and tidied, and the English texts
are now complete rather than patchy. Albania had the wrong unit on 40 m
(MHz instead of kHz) — corrected.
Also
- iPad: world map in the correct aspect ratio, time axis no longer wraps
- Translations refreshed across all 44 languages
- Many labels made consistent
The developer, Reiner Wilhelm Klohn, 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 Linked to You
The following data may be collected but it is not linked to your identity:
- Location
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Reiner Wilhelm Klohn
- Size
- 167.8 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Generous tip ☕☕☕ $3.99
- Nice tip ☕☕ $2.99
- Small tip ☕ $0.99
- Copyright
- © 2026 Reiner Klohn
