RF spectrum scanning & coordination · SDR hardware from ~€40

Find clean frequencies before the downbeat.

Spektra sweeps the UHF wireless-mic band in seconds on an SDR from around €40 — live spectrum with waterfall, clear free/occupied verdicts, and a Frequency Advisor that turns the measured gaps into an intermod-safe, printable coordination plan in one click.

Get Spektra — one-time license Try the live demo Open on the platform

Works offline at the venue Double-click app · no Python, no drivers Interactive demo · free account, no dongle 7 languages · 8 regulator regions

spektra · live · 470–700 MHz

SCANNING

Free channels

14 clean

Occupied ranges

5 in use

Tightest margin

0.42 MHz

Signal level

Free

Occupied

Noise threshold

Live preview — synthetic data

128

Coordinated channels max

27+

Equipment device families

Analyzer families auto-detected

Interface languages

Everything for coordination

One tool from scan to soundcheck

Spektra covers the whole pre-show RF workflow — sweep the band, read what's free, lay out your channel plan, and hand off clean numbers to the stage.

Live spectrum + dual waterfall

Full 470–700 MHz UHF sweep in a few seconds, ~1-second cold start, band presets for DECT and 2.4 GHz — hardware permitting up to 6 GHz. A live waterfall on IQ-capable devices plus a timestamped sweep-history strip on every analyzer.

Frequency Advisor

4–128 coordinated, intermod-safe suggestions placed inside the actually measured free windows — full 2-tone/3-tone IM3 checking, Robust and High-density profiles, and deterministic results: a reprinted plan always matches the printed one.

8 analyzer families, one picker

RTL-SDR (from ~€40), tinySA & tinySA Ultra, RF Explorer, HackRF One, Airspy and SDRplay — auto-detected on plug-in. No hardware yet? Demo mode generates a synthetic spectrum for training.

Smart 3-state occupancy

Not a dumb threshold: Spektra distinguishes your own carriers (green) from contention on your channel (amber) and unknown interference (red) — with a suggest-threshold helper for the noise floor.

27+ device families & regulation

Shure, Sennheiser, Lectrosonics, Sony and budget channel-wheel gear — group/channel picks resolve to exact MHz. Regulation overlays for 8 regions tint TV whitespace and give each device a license verdict.

Listen, snapshot & hand off

FM-demodulate and listen to any parked frequency with squelch and level meter. Save and compare sweeps, export scans as CSV/JSON — and hand guest crews the Advisor's coordination CSV or printable A4 PDF with spectrum snapshot.

Straight off the screen

The spectrum view, reading a band

The same view you'll run at the venue — captured here in the free browser demo on a synthetic sweep: 10 free channels, 9 occupied ranges, the noise threshold and the channel plan overlaid.

Spektra's spectrum view in the browser demo: a 470–700 MHz sweep with labeled carriers like Vocal RX 1 and IEM Band R, occupied ranges shaded red, free ranges green, the dashed noise threshold, and counters reading 10 free channels and 9 occupied ranges. — Free in green, occupied in red, tightest margin in MHz — drive this exact view yourself in the live demo; the desktop app draws the same picture from real RF.

Up and running in minutes

How Spektra works

No rack of gear, no lab analyzer, no install marathon. A dongle and a double-click.

Plug in & launch

Connect any of 8 supported analyzers — Spektra auto-detects it and cold-starts in about a second. Everything is bundled in one double-click app: no Python, no drivers.

Scan the band

Sweep the UHF band in seconds, watch the waterfall, and read the 3-state verdicts: your carriers green, contention amber, intruders red — every usable gap listed.

Coordinate & go

One click on the Frequency Advisor places 4–128 intermod-safe frequencies inside the measured gaps — print the A4 coordination sheet and hand it to the stage.

Built for any crew

Speaks your language. Suits your venue.

The interface ships in seven languages and switches instantly — no reload. Dark mode for the FOH position, light mode for daylight load-in, with a tunable accent so it fits your rig.

EnglishDeutschFrançaisEspañolItalianoNederlandsPortuguês

Dark

Light

Why Spektra

Pro-level coordination, without the pro-level invoice

Get the essentials that matter on show day for a fraction of the cost of dedicated suites and lab hardware.

Capability	Spektra Best value	Pro coordination suite	Lab spectrum analyzer
Typical cost	€49 + €40 dongle	€1,000–4,000	€2,000–10,000+
Live RF scanning + waterfall	✓	✓	✓
Automatic free-channel detection	✓	✓	—
Intermod-safe coordination (IM3), up to 128 ch	✓	✓	—
Own-carrier vs. interference detection	✓	Partial	—
Printable coordination sheet (PDF)	✓	✓	—
Multi-region regulatory overlays	✓	✓	—
On-frequency audio monitoring	✓	—	Some
Runs on a low-cost USB dongle	✓	—	—
Pocket-sized & portable	✓	Laptop + receiver	Bench unit

What you need

Minimal kit. Maximum coverage.

An SDR or analyzer

From a ~€40 RTL-SDR to tinySA, RF Explorer, HackRF, Airspy or SDRplay — 8 families, auto-detected. Or start in demo mode with no hardware at all.

A Mac or Windows PC, one double-click

Ships as a compact desktop app for macOS (Apple Silicon & Intel) and Windows with everything bundled — no Python, no Homebrew, no driver installs.

Nothing else

100% local and private: binds to localhost only, no telemetry, no account, no cloud. Works fully offline at the venue.

One-time license

Buy Spektra once on Gumroad for €49, download instantly, and get updates for the version you own. No subscription.

Questions, answered

Frequently asked

What hardware do I need to run Spektra?

Any of 8 supported analyzer families, auto-detected on plug-in: RTL-SDR Blog V3 (the ~€40 reference device) and generic RTL2832U dongles, tinySA and tinySA Ultra, RF Explorer WSUB1G and 3G Combo, HackRF One, Airspy, and SDRplay RSP models. No hardware yet? A built-in demo mode generates a synthetic spectrum so you can learn the app first.

Which bands and regions does it cover?

The default sweep covers the 470–700 MHz UHF wireless-mic band in a few seconds, with presets for DECT (1880–1900 MHz) and 2.4 GHz — and capable hardware can tune up to 6 GHz. Regulation overlays for 8 regions (DE, UK, EU/CEPT, US, FR, AU, JP, CA) tint TV whitespace and give each registered device a license verdict: license-free, registration required, or forbidden.

Does it replace professional coordination software?

For the pre-show workflow, it closes the whole loop: sweep the band, read what is genuinely free, and let the Frequency Advisor generate 4–128 intermod-checked frequencies inside the measured gaps — then print the plan as an A4 PDF. What it does not do is remote-control receivers the way manufacturer suites do for their own gear.

How do I buy and download it?

Purchase a one-time license through Gumroad. After checkout you get an instant download link plus future updates for that major version. Spektra ships for macOS (Apple Silicon & Intel) and Windows as a double-click app — no Python, no driver installs, everything bundled.

Can I use it without internet?

Yes. Spektra is 100% local: it talks to your analyzer over USB, binds to localhost only, and sends no telemetry. No account, no cloud — ideal for festival sites and venues with no connectivity.

What languages and themes are supported?

Seven interface languages — English, German, French, Spanish, Italian, Dutch and Portuguese — with light and dark themes and a tunable accent color.

Stop guessing. Start scanning.

Walk into your next show knowing exactly which frequencies are clean.

Get Spektra on Gumroad Try the live demo

€49 one-time license · instant download · updates for your major version · or try the interactive demo free (just an account, no dongle)

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