Comparison

RST 599 Pro vs SlipStick

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

SlipStick

This app is a fully functional digital reproduction of a classic engineering slide rule. It allows users to perform complex calculations like multiplication, division, logarithms, and trigonometry, just like the original manual tool.

Highlights
  • Virtual slide rule reproduction
  • Multiplication and division
  • Logarithm calculations
  • Trigonometry calculations
  • Classic engineering tool
Features
Read full description

A reproduction of a classic engineering tool - the slide rule. This fully functional manual calculating device was the engineer and math student's means of quickly solving multiplication, division, logarithm and trigonometry calculations until the invention and wide spread use of electronic calculators.

Screenshots

RST 599 Pro4 screens
SlipStick4 screens

Verdict

The call

The clearest difference is rating: SlipStick at 4.6 against RST 599 Pro's 4.0. SlipStick also leads on review sentiment (83% vs 50%) and update cadence (weekly vs every 2 months). On ads, in-app purchases, monetization model 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

RST 599 Pro costs $4.99 and SlipStick $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

SlipStick holds the better App Store score, 4.6 against 4.0. Both are backed by a comparable volume of ratings — 3 and 9 respectively. Written reviews point the same way: 50% of RST 599 Pro's written reviews are positive against 83% of SlipStick's.

UpkeepUpdate frequency

RST 599 Pro ships an update every 2 months, SlipStick weekly. Both last shipped on November 3, 2026.

Scorecard5 real differences · 5 level
RST 599 Pro versus SlipStick: the parameters behind the verdict, then further details
ParameterRST 599 ProSlipStick
Price$4.99$0.99 — better
Rating4.0 (3 ratings)4.6 (9 ratings) — better
Positive reviews50.0% of reviews83.3% of reviews — better
Number of ratings39 — better
Update frequencyEvery 2 monthsWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS12.012.0
Further details — not scored
Size40 MB1 MB
Age rating4+4+
Developerkoji kamogawaSteve Glenner

Customer experience

RST 599 Pro

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

SlipStick

All ratings9 ratings
Positive88.9%
Neutral0.0%
Negative11.1%
Written reviews6 reviews
Positive83.3%
Neutral0.0%
Negative16.7%

In-app purchases

None

RST 599 Pro

No in-app purchases

None

SlipStick

No in-app purchases

Questions

Is RST 599 Pro free?
RST 599 Pro costs $4.99, with no in-app purchases.
Is SlipStick free?
SlipStick costs $0.99, with no in-app purchases.
Which has better reviews, RST 599 Pro or SlipStick?
SlipStick is rated higher. RST 599 Pro averages 4.0 out of 5 from 3 ratings, while SlipStick averages 4.6 from 9 ratings.
Do RST 599 Pro or SlipStick have ads?
Neither RST 599 Pro nor SlipStick shows ads.
Which is updated more often, RST 599 Pro or SlipStick?
RST 599 Pro ships an update every 2 months, and SlipStick weekly. Most recently, RST 599 Pro was updated on November 3, 2026 and SlipStick on November 3, 2026.

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