Comparison

Glink vs rtl_tcp SDR

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Glink

Features
Read full description

Glink for iOS is a terminal emulator application that runs on iPad, iPhone and Mac's with M1/M2 chip. It is a port of our immensely successful and popular Glink for Windows product that has been chosen by more than 600,000 people world wide for connection to legacy host applications. Glink is used to access applications running on Bull, IBM, DEC, UNIX and Linux host systems. Glink has emulations for the IBM 3270 and 5250 terminals, Bull Questar DKU7102, DKU7107 and DKU7211 terminals, Bull VIP7800, VIP7760 and VIP7700 terminals, and DEC VT420, VT320/340, VT220 and VT102 terminals. ANSI 3.64 is supported for general communications work. Glink brings you a high quality and proven emulator for your iPad, iPhone devices and Mac computers with M1/M2 chip. Glink supports GlinkProxy, a server application designed to provide persistent host connections for Glink clients where the connection from the client device is unreliable. This may be because the device enters sleep mode or goes out of Wi-Fi range. FEATURES - IBM3270, IBM5250, Bull DKU7107, Bull VIP7800, Bull VIP7700, Bull DKU7102, VT420, VT320/340, VT220, VT100/VT102, ANSI 3.64 terminal emulation, all screen sizes - TN3270, TN5250, TNVIP, Telnet and Ggate communication to host - IPv6 (Internet Protocol version 6) support - SSL/TLS support for secure communication - SSH for direct communication with the SSH Daemon. - SSH tunneling for Telnet protocol - Username/password or private key for SSH authentication - Multiple concurrent host sessions - Configurable multi line toolbar with function keys and macros - Configurable hot spots for function keys, numbers, characters and URLs - Macro recording for auto-login and for assignment to toolbar - Pop-up standard keyboard with support of international characters - Tab/shift-Tab and arrow-keys supported on external Bluetooth keyboard - All major function keys available as keyboard shortcuts - Press and hold Command-key on external keyboard to see list of built-in keyboard shortcuts - Colors can be customized - Supports GlinkProxy Session Persistence Server - Multiple host configurations supported - Export and import of configurations - Supports Managed App Configuration, which allows users to configure Glink remotely through Mobile Device Management (MDM) - Optional password to access configurations - Optional auto-connect and auto-login at startup - Optional use of double-tap as Enter/Transmit - IBM5250 emulation supports Double Byte Character Sets (DBCS) like Chinese, Japanese and Korean - Configurable scroll-back buffer contains history of your host session - Print or e-mail host print data - Print or e-mail terminal emulation content or scroll-back buffer content - Zoom and scroll as the Safari browser - Dynamic zoom to cursor position - Blinking attribute supported - Blinking cursor supported - Two finger swipe gesture to move cursor - Tap and hold to open Mail with e-mail address on screen - Supports external Bluetooth keyboards and barcode scanners

About

rtl_tcp SDR

This app acts as a software-defined radio receiver for iOS devices, allowing you to listen to various radio signals and view RF spectrum data. It connects to external SDR peripherals via a network protocol, requiring a separate server setup.

Highlights
  • Listen to AM, FM, SSB, CW signals
  • View RF spectrum and waterfall
  • Connect to networked RTL-SDR peripherals
  • Supports Airspy HF+, SDRPlay, LimeSDR Mini
  • Direct connection to Hermes Lite 2
Features
Read full description

An RTL-SDR Software Defined Radio receiver app for iOS devices.  Listen to AM, FM, SSB and CW radio signals. View an RF spectrum and waterfall. Connect, via the rtl_tcp network protocol, to networked RTL-SDR USB peripherals. This app requires an external rtl_tcp server. iOS devices do not currently support the direct connection of USB peripherals such as an RTL-SDR. Thus, the use of this app requires network access to a server, such as a Raspberry Pi (or Mac), with an RTL-SDR unit plugged into its USB port, and running the rtl_tcp protocol at an TCP/IP network address accessible from your iOS device. This allows a Raspberry Pi (or Mac) to act, essentially, as the USB port adapter for your iOS device. The rtl_tcp SDR app can also connect to hfp_tcp for the Airspy HF+, rsp_tcp for SDRPlay devices, and lmm_tcp for the LimeSDR Mini; see GitHub for server source code. This app can also connect to a Hermes Lite 2 QRP transceiver directly, if it has a known IP address, or through an hl2_tcp server. No support is provided for installing any of the rtl_tcp or other tcp software needed to use this app (with a Raspberry Pi, or otherwise). Please do not download this app unless you are already familiar with Software Defined Radio, have an RTL-SDR or equivalent USB SDR peripheral, and have already installed and tested rtl_tcp on your Raspberry Pi, Mac, or other server. Note that this app requires a very high bandwidth network connection in order to receive streams of real-time RF samples from an RTL-SDR. It is recommended that your rtl_tcp server be on a wired connection rather than on the same WiFi as your iOS device.

Screenshots

Glink4 screens
rtl_tcp SDR3 screens

Verdict

The call

The clearest difference is price: rtl_tcp SDR at $12.99 against Glink's $37.99. Glink's advantage is iOS requirement (11.0 vs 16.6). On update cadence, 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

Glink costs $37.99 and rtl_tcp SDR $12.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Glink ships an update every 5 months, rtl_tcp SDR every 4 months. The most recent releases landed on October 31, 2026 and October 29, 2026 respectively.

Scorecard2 real differences · 8 level
Glink versus rtl_tcp SDR: the parameters behind the verdict, then further details
ParameterGlinkrtl_tcp SDR
Price$37.99$12.99 — better
Rating—3.9 (32 ratings) — better
Positive reviews—40.0% of reviews
Number of ratings—32 — better
Update frequencyEvery 5 monthsEvery 4 months — better
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS11.0 — better16.6
Further details — not scored
Size47 MB3 MB
Age rating4+4+
DeveloperGallagher & Robertson ASHotPaw Productions

In-app purchases

None

Glink

No in-app purchases

None

rtl_tcp SDR

No in-app purchases

Questions

Is Glink free?
Glink costs $37.99, with no in-app purchases.
Is rtl_tcp SDR free?
rtl_tcp SDR costs $12.99, with no in-app purchases.
Do Glink or rtl_tcp SDR have ads?
Neither Glink nor rtl_tcp SDR shows ads.
Which is updated more often, Glink or rtl_tcp SDR?
Glink ships an update every 5 months, and rtl_tcp SDR every 4 months. Most recently, Glink was updated on October 31, 2026 and rtl_tcp SDR on October 29, 2026.

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