OmniRTA - Spectrum Analyzer

Low-frequency analysis forces a trade-off: a high-Q filter gives sharp resolution but reacts slowly, while a low-Q filter reacts fast but blurs nearby resonances together. OmniRTA is a real-time RTA spectrum analyzer for Android with three interchangeable engines, letting users compare its innovative Bayes algorithm directly against CQT and FFT, two classic methods used in pro acoustic tools.

🔒 100% Ad-Free • Pro Precision • Zero Data Collection
Enjoy a clean, distraction-free professional tool. The app contains no ads, requires no login, works 100% offline, and collects no personal data.

Who it's for
For live sound engineers, Bayes tracks bass transients in real time while isolating two close low-end resonances, speeding up PA tuning under real conditions. For acousticians, switching to CQT at 1/12-octave with Peak Hold while playing pink noise makes room modes clearly visible, thanks to IEC 61260-compliant Q filtering. For musicians, Piano Roll aligns each detected note under its matching piano key at 1/12 or 1/24-octave resolution, making pitch drift easy to spot in any of the three modes.

Why people install it
• Catch bass transients instantly thanks to the dual-path Bayes fusion algorithm.
• Separate closely spaced low resonances via a high-Q fine-filtering path running in parallel.
• Compare results against known standards thanks to built-in CQT and FFT reference engines.
• Cut false readings from background noise thanks to an adaptive contextual fusion factor.
• Match certified lab equipment thanks to IEC 61260-compliant Q filtering in CQT mode.

Key features
🎯 Bayes algorithm (default engine)
• Dual-path probabilistic fusion, unique among documented mobile spectrum analyzers
• Instant response to low-frequency transients without sacrificing resolution
• Independently adjustable low-band (qLow) and high-band (qHigh) Q, blended from 140-280 Hz
• Dedicated x64 cascaded decimation for cleaner low-frequency signals before fusion

📊 CQT and FFT — two classic reference engines
• CQT: IEC 61260-compliant filter bank with auto-calculated Q, the industry-standard method
• FFT: radix-2 transform, selectable window from 1024 to 8192 points
• All engines share the same resolution, scale, and display options; switching takes one tap

⚙️ Flexible resolution and display
• Four band resolutions from 1/3 to 1/24 octave (30 to 240 bands)
• Five X-axis scales: Logarithmic, Octave (1kHz), Octave (C), Piano Roll, and Bark
• ISO-226 equal-loudness grid or linear (10 dB) Y-axis display
• Configurable Peak Hold up to 120s, plus real-time Tilt, Centroid, and Bandwidth readouts

What makes OmniRTA different
Bayes runs two filtering paths at once on every band below 280 Hz: a selective high-Q filter for fine resolution, and a second path tracking energy to detect transients. A contextual fusion factor blends both, accelerating response during transients while keeping fine resolution at steady state. Because CQT and FFT are included, users can A/B their recordings across all three engines directly. The DSP engine runs natively in Rust rather than Java or Kotlin, avoiding garbage-collector pauses and eliminating data races.

Transparent pricing & privacy
OmniRTA requests microphone access solely for real-time acoustic analysis, with no network, storage, or contacts permissions required.
- 100% Ad-Free: Zero ads, zero pop-ups, zero tracking, ever.
- Free tier: FFT-only analysis with essential resolutions and scales.
- Pro & Pro+ tiers: Unlock the Bayes algorithm, CQT engine, high resolutions, ISO-226 grid, Peak Hold, and advanced readouts via a simple one-time in-app purchase — no subscription, no recurring fees.

Download OmniRTA and compare a genuinely new low-frequency algorithm against the two methods engineers already trust.