RST 599xp vs Modal Math
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RST 599xp
This app simulates amateur radio CW QSOs with realistic call signs, signal levels, and speeds. It supports various QSO styles, including contest and rubber stamp, with features like pile-up reproduction and RIT control.
- CW QSO simulation
- Realistic call signs and signal levels
- Pile-up reproduction (up to 3 stations)
- RIT and CW filter functions
- Spectrum scope display
- Contest and rubber stamp QSO styles
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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. 【Characteristic】 1. Reproduction of pile-up (Called from up to 3 stations at the same time) 2. "599BK","Rubber Stamp" and "AADX Contest" style support. 3.RIT and CW filter functions Band Width(300Hz/600Hz) control supported. 4.Realistic signal meter according to audio signal level. 5.Status display showing TX / RX operation. 6.The spectrum scope display 【Other features】 1. Function to select the number of QSOs to communicate (5, 20) 2. QRN ON / OFF selection function 3. Function to select the call area (JA's, W / W) 4. Judgement of "RST, QRA and QTH" or "RST, QRA and WX" information. 5.Supported the ESC button for escaping from the long TX/RX. 6.Supported the Score Clear button of your Hi-Score Data. 7.Support the capture function of Hi-Score dialog. 8.Supported the QSB in the mode of "599BK / AADX" and "W/W" Supported keyboard input from Apple Silicon Mac. (Not compatible with iPadOS) A-Z, 0-9, / Enter:return ESC:esc BS:delete CQ:UpArrow AGN:DownArrow TU:[ LEFT:LeftArrow RIGHT:RightArrow
Modal Math
This app provides accessible math practice designed by teachers for students with special language needs. It focuses on fostering conceptual understanding and reinforcing mathematical language for diverse learners.
- Designed by teachers
- Accessible for special language needs
- Fosters conceptual understanding
- Reinforces mathematical language
- Supports diverse learning needs
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Learn from anywhere in the Modal Math app! Created by real teachers for real students. At Modal Math, we believe that math learning should to be accessible for learners with special language needs. We aim to create a tool that is makes math learning accessible and meaningful to all. The goal is to foster conceptual understanding of mathematics while establishing and reinforcing language for students with diverse learning needs and ability levels. Our dream is to provide access to learning forstudents in accordance with their needs. Until we do this, we can never know what a student is capable of. https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is price: Modal Math at Free against RST 599xp's $2.99. Modal Math also leads on device support (3 vs 1). RST 599xp's advantage is in-app purchases (none vs 2) and iOS requirement (12.0 vs 15.1). On rating, ratings volume, update cadence and ads 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
Modal Math is free to download; RST 599xp costs $2.99 up front. Modal Math sells 2 in-app purchases, starting at $24.99 per month. RST 599xp asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for RST 599xp against 5.0 for Modal Math. Both are backed by a comparable volume of ratings — 1 and 2 respectively.
RST 599xp ships an update every 2 months, Modal Math every 5 weeks. The most recent releases landed on October 13, 2026 and October 8, 2026 respectively.
| Parameter | RST 599xp | Modal Math |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 5.0 (1 ratings) | 5.0 (2 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 2 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 12.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 40 MB | 75 MB |
| Age rating | 4+ | 4+ |
| Developer | koji kamogawa | Asledu LLC |
Customer experience
RST 599xp
Modal Math
In-app purchases
RST 599xp
No in-app purchases
Modal Math
- Classroom Membership$24.991 Month
- DHH Teacher Resources$6.99
