SDR vs RS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SDR
Control your Icom radio remotely from your iPhone. View spectrum scope, waterfall, and access all radio controls over Wi-Fi or the internet. Supports various Icom models and includes features for ham radio operators.
- Spectrum scope and waterfall display
- Full radio control
- Remote operation over Wi-Fi/internet
- FT8-Improved and JS8 modes
- CW decoder and keyer
- Speech transcription and translation
- Logbook with ADIF import/export
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Your Icom radio on your iPhone: at home over Wi-Fi or from anywhere over the internet. Made by a ham, for hams, with personal support included. SDR-Control Mobile shows the spectrum scope and waterfall of your Icom radio with all its controls. No extra hardware or software needed. WORKS WITH ■ IC-705 (Wi-Fi) ■ IC-7610, IC-7760, IC-9700, IC-7300 MK2 and the IC-R8600 receiver (radio on your network by cable) The app connects over the network only. The older IC-7300 (without MK2) has no network connection and can't be used. OPERATE ■ Spectrum scope and waterfall with band plan, DX Cluster and FT8 spots ■ Two VFOs, filters, preamp, attenuator, NB, NR, notch, AGC and more ■ Compact floating panels: tuning, PTT, CW, memories, macros, Command Bar, DTMF, RIT / ∆TX, D-Star ■ Your iPhone as microphone and speaker; the radio keeps playing in the background ■ Ready for iPhone Duo: the iPhone screens when folded, the large radio screen when open MODES ■ FT8-Improved with AutoAnswer and AutoCQ, plus the classic FT8 ■ JS8 keyboard chat ■ CW with decoder, keyer and CW keyboard ■ Speech: incoming voice transcribed and translated, your typed text sent as speech ■ SSTV, HF-Fax, APRS, WSPR and D-Star FT8-Improved, JS8, Speech and WSPR need iOS 26. TOOLS ■ Logbook with ADIF import and export, shared via iCloud with SmartSDR, FT-Control, TS-Control and K4-Control, on iPhone, iPad and Mac ■ DX Cluster, POTA, PSK Reporter, Call Lookup, Band Plan, Network Stats, Memories, Scanning ■ Controllers: MIDI, CTR2, HaliKey, Pryme, Flic ■ 4O3A Genius devices and Ultra Beam antennas MADE BY A HAM Made by Marcus, DL8MRE, who has been developing apps for Apple devices since 2009 and uses this app every day in his own shack, where all supported radios are on the desk. Personal online support and a detailed manual are included. Updates with new modes and features are free: no subscription, no in-app purchases. WHAT YOU NEED ■ One of the radios above, connected to your network ■ An iPhone with iOS 18 or later ■ For use over the internet: access to your home network from outside (see the manual) Manual: https://go-to.me/sdrcontrol-mobile-manual More apps: https://ham-radio-apps.com SDR-Control is developed independently and is not affiliated with or endorsed by Icom.
RS
This app expands D-STAR transceiver capabilities over the internet using Terminal or Access Point modes. It allows communication even outside of repeater range by routing signals through your device via cellular or Wi-Fi networks.
- Terminal mode for internet-based transceiver communication
- Access Point mode to function as a Wireless LAN access point
- Expands D-STAR capabilities beyond repeater range
- Utilizes internet, LTE, or 5G networks for signal transmission
- Requires public IP address for gateway operation
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[Features] The RS-MS3I is an iPhone or iPad application designed to expand the DV mode capability of a D-STAR transceiver using a Terminal or an Access Point mode. These modes enable D-STAR operations by sending signals from the D-STAR transceiver over the Internet, even when that transceiver is out of the range of a D-STAR repeater. The transceiver sends your voice signals using an Internet, LTE, or 5G network, through an iPhone or iPad. 1. Terminal mode By operating the D-STAR transceiver through the iPhone or iPad, you can contact other D-STAR transceivers. In the Terminal mode, the transceiver will not transmit an RF signal, even if [PTT] is held down, because the microphone audio signal is transmitted through an Internet, LTE, or 5G network. 2. Access Point mode In this mode, the D-STAR transceiver functions as a Wireless LAN access point. The D-STAR transceiver repeats the received signal from the iPhone or iPad, to other D-STAR transceivers. Refer to the instruction manual (PDF) for setting details. The instruction manual can be downloaded from the ICOM website. (URL: https://www.icomjapan.com/support/manual/) [Device requirements] iOS15 or later [Usable transceivers] (As of March 2026) - ID-52A PLUS or ID-52E PLUS Note: - This application operates on iPhone or iPad as a gateway server on the D-STAR system. Therefore, a public IP address must be set on either the iPhone, iPad, or the Wireless LAN router. - Ask your mobile carrier or ISP for a public IP address. According to the contract, communication charges and/or communication packet limits may occur. - Ask your mobile carrier, ISP, or manufacturer of your iPhone, iPad, or router about public IP setting details. - Icom does not guarantee that the RS-MS3I works on all iPhone and iPad. It may not work properly, depending on the OS version, installed applications, or other reasons. - When a Bluetooth headset is connected to the transceiver, depending on the combination of your iPhone or iPad and the Bluetooth headset, sound may be interrupted, and communication may not be possible. In such cases, please disconnect the Bluetooth headset before use. - Turn OFF the Wireless LAN function when communicating through an LTE or 5G network. - Operate your transceiver with the RS-MS3I in compliance with appropriate regulations. - Icom recommends that you operate them with a club station license.
Screenshots
Verdict
The clearest difference is review sentiment: SDR at 84% against RS's 14%. SDR also leads on rating (4.6 vs 2.4) and update cadence (every 2 weeks vs every 4 months). RS's advantage is price (Free vs $44.99) and device support (3 vs 1). On ads and in-app purchases 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
RS is free to download; SDR costs $44.99 up front. Neither carries in-app purchases, so what you see is what you pay.
SDR holds the better App Store score, 4.6 against 2.4. That said, the two scores are not equally well evidenced: SDR has 73 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 84% of SDR's written reviews are positive against 14% of RS's.
SDR ships an update every 2 weeks, RS every 4 months. The most recent releases landed on November 7, 2026 and November 4, 2026 respectively.
| Parameter | SDR | RS |
|---|---|---|
| Price | $44.99 | Free — better |
| Rating | 4.6 (73 ratings) — better | 2.4 (5 ratings) |
| Positive reviews | 84.3% of reviews — better | 14.3% of reviews |
| Number of ratings | 73 — better | 5 |
| Update frequency | Every 2 weeks — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 55 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Marcus Roskosch | ICOM INCORPORATED |
Customer experience
SDR
RS
Bugs and requests
SDR
Reported bugs
12 issues- Dialogs do not scale with larger text setting
- Frequency display overlaps buttons
- FT8 decoding issues (lower signal levels than WSJTX)
- App crashes and leaves radio in transmit
- Logbook export not functional after update
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- Function button for horizontal scrolling not fully displayed
- FT8 decode is useless and unreliable
- Messed up radio, requiring reset
- RX audio unusable outside home network (prior to 1.5.1)
- Struggles with audio RX packets on remote cellular networks
- Cannot work over mobile data with certain carriers (EE)
- FT8 alerts sound but don't display
Requested features
14 requests- Develop for IC-7800
- CarPlay support
- Apple Watch add-on
- Windows version
- JS8call support
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- More digital modes
- Display memory bank names
- Initiate memory scan from app
- WSPR implementation
- Tool for WSPR
- More FT8/FT4 features (e.g., setting transmit frequency directly in FT8 view)
- Send image to unit
- KISS TNC support
- Control digital modes (reflectors, etc.)
RS
Not enough reviews yet to summarise bugs or requests.
In-app purchases
SDR
No in-app purchases
RS
No in-app purchases






