小灵龙App vs rtl_tcp SDR
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
小灵龙App
This app provides comprehensive mobile services for campus cards, including traditional card functions like consumption and authentication, enhanced with QR code capabilities. It offers features for managing your campus card, paying various campus fees, and booking campus facilities.
- Campus card management
- QR code functionality
- Campus fee payments
- Facility booking
- Card application and registration
Read full descriptionHide full description
【小灵龙】是一款面向校园的一卡通服务APP，在传统卡消费、认证的基础上增加了二维码功能，为校园用户提供专业、全面的移动一卡通服务。 【校园卡管理】 提供全面的校园卡服务，充值、信息查询、账单查询、流水查询、挂失／解挂、失卡招领、校园卡在线申请、校友注册等 【校园缴费】 项目缴费、电费、网费、辅修费、等级考试费、党团费、培训费、学费 【校园预订】 为校内餐厅、场馆、会议室、自习室等场所提供预订服务
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.
- 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
Read full descriptionHide 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
Verdict
The clearest difference is price: 小灵龙App at Free against rtl_tcp SDR's $12.99. 小灵龙App also leads on update cadence (monthly vs every 4 months) and iOS requirement (9.0 vs 16.6). rtl_tcp SDR's advantage is rating (3.9 vs 1.0) and ads (none vs shown). On review sentiment, ratings volume, 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
小灵龙App is free to download; rtl_tcp SDR costs $12.99 up front. Neither carries in-app purchases, so what you see is what you pay.
rtl_tcp SDR holds the better App Store score, 3.9 against 1.0. Both are backed by a comparable volume of ratings — 12 and 32 respectively. Written reviews point the same way: 33% of 小灵龙App's written reviews are positive against 40% of rtl_tcp SDR's.
小灵龙App ships an update monthly, rtl_tcp SDR every 4 months. The most recent releases landed on September 22, 2026 and September 16, 2026 respectively.
| Parameter | 小灵龙App | rtl_tcp SDR |
|---|---|---|
| Price | Free — better | $12.99 |
| Rating | 1.0 (12 ratings) | 3.9 (32 ratings) — better |
| Positive reviews | 33.3% of reviews | 40.0% of reviews — better |
| Number of ratings | 12 | 32 — better |
| Update frequency | Monthly — better | Every 4 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Best chart rank | — | #197 — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 9.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 157 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | 北京新中新诚通信息技术股份有限公司 | HotPaw Productions |
Customer experience
小灵龙App
rtl_tcp SDR
In-app purchases
小灵龙App
No in-app purchases
rtl_tcp SDR
No in-app purchases
