Comparison

RST 599 Pro vs LemurKey

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

LemurKey

This app provides Morse code receiving practice for callsigns, sentences, and two-way contacts. It features adjustable settings, a Koch-style learning mode, and simulated interference for realistic training. Compete with friends on leaderboards and track your progress.

Highlights
  • Morse receiving practice
  • Adjustable WPM and spacing
  • Scripted two-way QSO mode
  • Live DX band conditions
  • Koch-style learning mode
  • Simulated interference options
Features
Read full description

LemurKey is Morse receiving practice built to practice real copy skills — callsigns, sentences, and two-way QSOs. Compete your friends with Strava-style leaderboards and go for the crown! COPY PRACTICE • Word, Callsign, and Sentence modes with slot-based copy • Adjustable WPM, character spacing, tone, and volume • Stars & Watts for clean copies; scrubber unlocks after you listen QSO MODE • Scripted two-way contacts: copy each transmission, then reply • Live accuracy feedback through the exchange LIVE DX • Band conditions and spots tailored to your grid square • Optional location for home grid (when-in-use only) TRAIN • Koch-style Learn mode to build speed character by character • Learn to send Q codes; practice sending by recall • Keys mode to hear any letter at your session settings CHAOS MODE • Optional QRM, QRN, and QSB while copying • Higher watt multipliers when the band gets noisy ACCOUNT (OPTIONAL) • Sign in to sync progress, compete on leaderboards, and back up stats • Delete your account anytime from Account Works offline for practice once installed. Audio runs locally on your device. Privacy policy: https://lemurkey.app/privacy.html Support: support@lemurkey.app

Screenshots

RST 599 Pro4 screens
LemurKey4 screens

Verdict

The call

The clearest difference is review sentiment: LemurKey at 100% against RST 599 Pro's 50%. LemurKey also leads on price (Free vs $4.99) and rating (5.0 vs 4.0). RST 599 Pro's advantage is iOS requirement (12.0 vs 15.0). On ratings volume, ads, in-app purchases 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

LemurKey is free to download; RST 599 Pro costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

LemurKey holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 3 and 6 respectively. Written reviews point the same way: 50% of RST 599 Pro's written reviews are positive against 100% of LemurKey's.

Scorecard5 real differences · 5 level
RST 599 Pro versus LemurKey: the parameters behind the verdict, then further details
ParameterRST 599 ProLemurKey
Price$4.99Free — better
Rating4.0 (3 ratings)5.0 (6 ratings) — better
Positive reviews50.0% of reviews100.0% of reviews — better
Number of ratings36 — better
Update frequencyEvery 2 months—
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPodiPhone, iPod
Requires iOS12.0 — better15.0
Further details — not scored
Size40 MB8 MB
Age rating4+4+
Developerkoji kamogawaSteve Metcalf

Customer experience

RST 599 Pro

All ratings3 ratings
Positive66.7%
Neutral33.3%
Negative0.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

LemurKey

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

RST 599 Pro

No in-app purchases

None

LemurKey

No in-app purchases

Questions

Is RST 599 Pro free?
RST 599 Pro costs $4.99, with no in-app purchases.
Is LemurKey free?
LemurKey is free to download, with no in-app purchases.
Which has better reviews, RST 599 Pro or LemurKey?
LemurKey is rated higher. RST 599 Pro averages 4.0 out of 5 from 3 ratings, while LemurKey averages 5.0 from 6 ratings.
Do RST 599 Pro or LemurKey have ads?
Neither RST 599 Pro nor LemurKey shows ads.

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