Comparison

RST 599 Pro vs MorseCAT

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

RST 599 Pro

This application simulates amateur radio CW QSOs with realistic call signs, signal levels, and speeds. It supports various QSO styles, pile-ups, and includes features like RIT, CW filters, and a spectrum scope for an immersive experience.

Highlights
  • Realistic CW QSO simulation
  • Pile-up reproduction (up to 5 stations)
  • Multiple QSO style support
  • RIT and CW filter functions
  • Spectrum scope display
  • Customizable call sign and CW speed
Features
Read full description

This app is a real CW QSO simulator for Amateur Radio. "599BK type QSO", "Rubber stamp type QSO" and "Contest type QSO" are supported. In addition, the call sign, signal level, CW speed, etc. that occur differ for each QSO in order to achieve realism. Furthermore, the call sign and CW speed of your own station that issues CQ can be set arbitrarily. 【Main features】 1. Reproduction of "pile-up" Called from up to 5 stations simultaneously. 2. "599BK","Rubber Stamp" and "AADX Contest" style support. 3.RIT and CW filter functions  Band Width(100-999Hz) control supported. 4.Landscape display support. 5.Realistic signal meter according to audio signal level. 6.Status display showing TX / RX operation. 7.The spectrum scope display 【Other features】 1. Select the number of QSOs to communicate. You can choose from 5,10,20,50,100. 2. Ability to select QRN. You can choose None, Weak, Norm, Hard. 3. Function to select Callsign Area. You can choose from JA's USA's or W / W. 4. Function to select SideTone. 5. Synchronized with CW BandPassFilter. 6. Judgement of "RST, QRA and QTH" or "RST, QRA and WX" information. 7.Supported the ESC button from the long TX/RX. 8.Supported the Score Clear button of Hi-Score. 9.Support the capture function of Hi-Score dialog. 10.Supported the QSB in the mode of "599BK / AADX" and "W/W" Supported keyboard input from Apple Silicon Mac. (Not compatible with iOS) [Support Key] A-Z, 0-9, / Enter:return ESC:esc BS:delete CQ:UpArrow AGN:DownArrow TU:[ LEFT:LeftArrow RIGHT:RightArrow

About

MorseCAT

Features
Read full description

Learn Morse code the way high-speed operators actually hear it: as sounds, not dots and dashes. MorseCAT is an Instant Character Recognition (ICR) trainer. Every character is sent at real speed from day one — you never count elements, you learn the sound. Then you answer the way an operator would: key it back. LEARNING IS FREE. FOREVER. • The full guided path — every letter, number, and prosign, in the proven CW Academy order • Listen & Learn — hear each character introduced as pure sound • Listen & Say — say the character out loud and MorseCAT grades you by ear • Free Practice — your speed, your character set, whenever • Word Patterns and weekly LICW class groups — drill exactly what your class covers • Progress that means something: a per-character mastery heatmap, recognition-time tracking, a copy-ceiling benchmark, streaks, and a proficiency rank ANSWER LIKE AN OPERATOR Hear a character, key it back. Use the on-screen straight key, the touch paddle, or plug in real hardware — Bluetooth MIDI keyers and paddles (TinyMIDI, HaliKey, VBand-style interfaces) take over automatically the moment they connect. Motor memory in, guesswork out. REAL SPEED, HONEST NUMBERS Characters always sound at your character speed (default 32 wpm, floor 25) — fast enough that there's no time to count elements, which is the whole point. Difficulty comes from closing the gaps, Farnsworth-style, never from slowing the code down. MorseCAT measures your time-to-recognize on every single character, so you always know which ones are instant and which ones still make you think. MORSECAT PRO — ONE PURCHASE, YOURS FOREVER A single one-time unlock (no subscription, ever) opens the arcade and the airwaves: • Key Invaders — read the falling words, shoot them by keying them • Ice Dash — an arcade sprint for your sending hand • The full QSO simulator — realistic contest and club exchanges: SST, POTA hunting, CWT, SKCC, and LICW scenarios, with band noise and fading if you want it • Advanced push drills — the Miss Drill and Send Sprint Code Invaders, single-caller QSOs (5 a day), and every learning tool stay free — and the whole arcade opens free for ten minutes every day, so you can try it before you decide. NO NONSENSE • No account. No ads. No tracking. • Works offline — practice on a plane, in a park, anywhere • Your progress lives on your phone, nowhere else Whether you're prepping for your first POTA hunt, keeping up with your LICW class, or chasing 40 wpm head-copy, MorseCAT meets your ear where it is and pushes it — one instantly-recognized character at a time. 73, and happy keying.

Screenshots

RST 599 Pro4 screens
MorseCAT4 screens

Verdict

The call

The clearest difference is price: MorseCAT at Free against RST 599 Pro's $4.99. MorseCAT also leads on update cadence (every 2 weeks vs every 2 months). RST 599 Pro's advantage is in-app purchases (none vs 1) and iOS requirement (12.0 vs 15.1). On ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

MorseCAT is free to download; RST 599 Pro costs $4.99 up front. MorseCAT sells 1 one-off in-app purchase. RST 599 Pro asks for nothing beyond the download.

UpkeepUpdate frequency

RST 599 Pro ships an update every 2 months, MorseCAT every 2 weeks. The most recent releases landed on September 27, 2026 and September 18, 2026 respectively.

Scorecard4 real differences · 6 level
RST 599 Pro versus MorseCAT: the parameters behind the verdict, then further details
ParameterRST 599 ProMorseCAT
Price$4.99Free — better
Rating4.0 (3 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings3 — better—
Update frequencyEvery 2 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS12.0 — better15.1
Further details — not scored
Size40 MB37 MB
Age rating4+4+
Developerkoji kamogawaAspen Ventures, LLC

In-app purchases

None

RST 599 Pro

No in-app purchases

1 purchases

MorseCAT

One-time1
  • MorseCAT Pro$4.99

Questions

Is RST 599 Pro free?
RST 599 Pro costs $4.99, with no in-app purchases.
Is MorseCAT free?
MorseCAT is free to download, with in-app purchases available.
Do RST 599 Pro or MorseCAT have ads?
Neither RST 599 Pro nor MorseCAT shows ads.
Which is updated more often, RST 599 Pro or MorseCAT?
RST 599 Pro ships an update every 2 months, and MorseCAT every 2 weeks. Most recently, RST 599 Pro was updated on September 27, 2026 and MorseCAT on September 18, 2026.

Other comparisons