RST 599 Pro vs SlipStick
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
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.
- Virtual slide rule reproduction
- Multiplication and division
- Logarithm calculations
- Trigonometry calculations
- Classic engineering tool
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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
Verdict
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
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.
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.
RST 599 Pro ships an update every 2 months, SlipStick weekly. Both last shipped on November 3, 2026.
| Parameter | RST 599 Pro | SlipStick |
|---|---|---|
| Price | $4.99 | $0.99 — better |
| Rating | 4.0 (3 ratings) | 4.6 (9 ratings) — better |
| Positive reviews | 50.0% of reviews | 83.3% of reviews — better |
| Number of ratings | 3 | 9 — better |
| Update frequency | Every 2 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 40 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | koji kamogawa | Steve Glenner |
Customer experience
RST 599 Pro
SlipStick
In-app purchases
RST 599 Pro
No in-app purchases
SlipStick
No in-app purchases









