# Spectral Bands: SDR Client — RTL-SDR & WebSDR Signal Client

> RTL-SDR & WebSDR Signal Client (iPhone/iPad app by Matthew Delashaw.)

- Source: https://appshunter.io/ios/app/spectral-bands-sdr-client/id6761870140 (this page in markdown: same URL + `.md`)
- Developer: [Matthew Delashaw](https://appshunter.io/developer/1891879325)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 18.6 · 1 MB
- Languages: American English
- Released: 2026-04-19
- Data updated: 2026-06-07
- User reviews in markdown: https://appshunter.io/ios/app/spectral-bands-sdr-client/id6761870140/reviews.md

## What is Spectral Bands?

SPECTRAL // BANDS — Signal Intelligence for iOS

Your RTL-SDR. Your iPhone. No compromises.

Spectral Bands is a high-performance Software Defined Radio client built for operators who demand real-time signal visualization and clean audio demodulation on the go. Connect to any rtl_tcp or rtlsdr-next WebSDR server and put a full signal intelligence station in your pocket.

BUILT FOR THE BAND
Whether you're monitoring 2m repeaters, chasing HF SSB DX, scanning air traffic, or hunting numbers stations at 3am — SpectralBands handles it with a DSP pipeline engineered for accuracy, not approximation.
— WFM / NFM / AM / USB / LSB demodulation
— 1024-bin real-time waterfall with dynamic range calibration
— Calibrated spectrum analyzer, -100 to 0 dB
— Software AGC with noise gating
— Squelch control for NFM monitoring
— Adjustable IF filter bandwidth for SSB and AM

TWO PATHS, ONE CLIENT
Connect to an rtlsdr-next server for high-efficiency server-side DSP with lower mobile CPU load, or drop into full local processing mode against any standard rtl_tcp server — complete with multi-stage FIR decimation and Hilbert SSB. 

The rtlsdr-next server software is open-source and can be hosted on any Linux or macOS machine with an RTL-SDR dongle. Search for 'rtlsdr-next' on GitHub for the official setup guide and high-performance daemon.

BUILT FOR THE FIELD
Background audio keeps your frequency monitored while you use other apps or lock your screen. A frequency bookmark registry lets you save and recall your favorite channels instantly. Reconnection logic handles mobile network handoffs without dropping your session.

THE INTERFACE
High-contrast OLED-optimized display designed for dark environments. If your shack looks like a 1980s cyberpunk film, you'll feel right at home.
Requires a networked RTL-SDR server (rtl_tcp or rtlsdr-next). iOS 18.6+, iPhone 12 or newer recommended.


## Version history (last 1 release)

### 1.0.1 — 2026-04-20

No release notes.

## Related topics

[sdr radio](https://appshunter.io/ios/topics/sdr-radio) · [rtl sdr](https://appshunter.io/ios/topics/rtl-sdr) · [web sdr](https://appshunter.io/ios/topics/web-sdr)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-07.*