PhosphorFAX Downloads & RevenuePhosphorFAX · App Store
PhosphorFAX is #1 in Weather Paid in South Korea and charting in 1 of 30 countries we track.
Updated 11 Nov 2026 · rankings refresh through the day
10 Nov 2026Full timeline · 3 events
- 🆕PhosphorFAX first spotted by AppInsider#40 in Top Paid · All Apps · South Korea
- 📦PhosphorFAX version 1.0No release notes
- 🆕PhosphorFAX released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Weather PaidPhosphorFAX at a glance
AI summary written from our chart and store data, 2026-11-11. It can be wrong: check the numbers above.
PhosphorFAX is a specialized utility for amateur radio operators and maritime enthusiasts that decodes HF weather fax signals directly on an iPhone, simulating a phosphor CRT display without requiring internet or external hardware. The app currently holds the #1 position in the South Korea Paid Weather category and ranks #19 in Grossing, indicating strong niche monetization despite having no user ratings.
Similar apps: RadioFax, HF Radio Fax, Weatherfax
PhosphorFAX on the App Store
App details
App privacy Measured
PhosphorFAX declares it collects no data at all — the rarest and most private label on the App Store.
As declared by the developer on the App Store — Apple requires every app to publish this label. We track changes over time.
Where PhosphorFAX's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| South Korea | WeatherPaid | #1 |
| South Korea | WeatherGrossing | #31 |
Apps near PhosphorFAX on the chart
Weather Paid, around #1.
Ratings
App Store, worldwide.
What users say about PhosphorFAX
From recent reviews.
About PhosphorFAX
It sends as well. Turn a photo, a received chart or the built-in test card into radiofax audio through the speaker, or export it as a WAV.
No internet connection. No external hardware. No account. Just your iPhone and a radio.
HOW TO RECEIVE
Tune your receiver 1.9 kHz below the station's listed frequency in USB, so the signal sits around 1900 Hz. Then on the DECODE screen:
ARM: wait for a start tone, then receive automatically
START: receive now, without waiting for a start tone
STOP: end the chart and save it
CLEAR: discard the chart in progress
Drag to look around the chart, and LATEST takes you back to the newest line
Pinch to zoom, double-tap to fit
The same guide is on the DECODE screen until a chart appears.
HOW LONG IT TAKES
Radiofax is slow, and that is part of its charm.
• The start tone lasts 5 seconds and is recognised within a second or two.
• Phasing follows, up to 30 seconds, while PhosphorFAX locks onto the start of each line. If no phasing is heard, receiving begins anyway after 40 seconds.
• A chart paints from the top at two lines a second at 120 LPM. A full chart takes about 10 minutes, 20 at 60 LPM and 5 at 240 LPM. In the first minute you will see only a thin strip, so give it time.
• On the stop tone the chart is saved to the log and the receiver re-arms for the next one.
• Sending takes as long as receiving: about 10 minutes for a chart at 120 LPM, longer for a tall photo. PhosphorFAX shows the duration before anything plays.
FEATURES
• Real-time radiofax receive at IOC 576 and 288, 60 to 240 lines per minute
• Automatic start and stop, re-arming after every chart
• Phasing lock and automatic slant correction for straight charts
• Automatic centre tracking
• Charts can be re-slanted and shifted after the broadcast has gone
• Live spectrum, waterfall, line scope and signal health panel
• Station list for 22 coast and met stations worldwide, with USB dial frequencies
• Chart log with zoom, levels, rotation, invert, share and save to Photos
• Send a photo, a chart or a test card, or export it as a WAV
• Paper, phosphor or negative chart rendering
• Green and amber phosphor CRT themes
• No accounts, no tracking, no network access
SENDING
PhosphorFAX produces audio and never keys a transmitter. Putting that audio on the air needs an appropriate transmitting licence. Sending into a second phone, or exporting a WAV, needs none.
Colour fax is not supported.
