Comparison

RTA Audio vs RDTap

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

Head to head
About

RTA Audio

Analyze audio in real-time with detailed frequency spectrum and waveform visualizations. Record and export your audio analysis results, including spectrograms and frequency tables, for sharing or archiving.

Highlights
  • Real-time audio analysis (FFT)
  • Recording and offline processing
  • Spectrogram and waveform visualization
  • Exportable analysis reports (PDF)
  • Adjustable resolution and frequency scale
  • Peak and RMS metering
Features
Read full description

RTA Audio Realtime analyzer with recording and Visualizer module with export. ••• Realtime analyzer ••• Realtime analyzer gives you the ability to analyze realtime audio input (built-in microphone or external audio accessory inputs) using Fast Fourier Transform with selected window function. You can also record the input for future offline processing or export. ••• Visualizer ••• This module presents you the results of offline audio analysis. Selecting previously captured recording gives the graph view, spectrogram and waveform of the audio data. Simple controls gives you the ability to play, loop, seek and change rate of the recording synchronized with analysis data presentation. Export function allows you to share or archive your analysis. Resulting PDF document contains basic recording information, spectrogram, peak & RMS graph and frequency table data with maximum peaks (with the time of the occurrence in recording) ••• Features ••• Resolution: 1/2 - 1/96 Octave Logarithmic frequency scale Fixed frequency range (20 - 20kHz) Tone scale view C₀- H₈ (A₄ = 440Hz) Peak hold graph Peak average graph RMS average graph Pointer (watch) function Peak and RMS input meter ••• Audio input specification ••• Audio session mode - measurement Input gain control Sample rate: 48000 Hz Bit depth: Float32 Channel: 1(mono) Frequency range: 20Hz - 20kHz Dynamic range: -100dB - 0dB ••• FFT (Fast Fourier Transform) specification ••• Frame size: 8192 Overlap: from 60% to 90% Smoothing Window: Bartlett-Hann, Blackman, Blackman-Harris (default), Blackman-Nuttell, Cosine, Flat Top, Gauss, Hamming, Hann, Lanczos, Nuttall, Rectangular, Triangular Hardware acceleration

About

RDTap

Control and configure SUB 90XX series subwoofers with access to internal parameters. Offers professionally tuned presets for seamless integration with top speakers and supports rapid setup for ground stacking or sub cluster configurations.

Highlights
  • Access internal subwoofer parameters
  • Advanced Crossover Engine (ACE) presets
  • Professionally tuned level and phase matching
  • Ground stacking and sub cluster configuration
  • Rapid setup for speaker designs
Features
Read full description

RDTap is dedicated to the SUB 90XX family of touring subwoofers (https://www.rcf.it/en/sub-9000-series), providing full access to their internal parameters. Several presets are available for their internal Advanced Crossover Engine (ACE), offering a professionally tuned match, both in level and phase, between the subwoofer itself and a selection of top speakers. In addition, a Ground Stacking or Sub Cluster combination of up to 3 subwoofers and one or more top speakers (defined as Design) can be rapidly defined and configured, with simple programming steps.

Screenshots

RTA Audio4 screens
RDTap3 screens

Verdict

The call

The clearest difference is in-app purchases: RDTap at none against RTA Audio's 1. RDTap also leads on update cadence (fortnightly vs every 28 months). RTA Audio's advantage is review sentiment (59% vs 50%). On price, ads, device support and iOS requirement 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

Both are free to download. RTA Audio sells 1 one-off in-app purchase. RDTap asks for nothing beyond the download.

UpkeepUpdate frequency

RTA Audio ships an update every 28 months, RDTap fortnightly. The most recent releases landed on October 15, 2026 and October 4, 2026 respectively.

Scorecard4 real differences · 6 level
RTA Audio versus RDTap: the parameters behind the verdict, then further details
ParameterRTA AudioRDTap
PriceFreeFree
Rating3.6 (31 ratings) — better—
Positive reviews58.5% of reviews — better50.0% of reviews
Number of ratings31 — better—
Update frequencyEvery 28 monthsFortnightly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size2 MB36 MB
Age rating4+4+
DeveloperNew Ball s.r.o.RCF spa

Customer experience

RTA Audio

All ratings31 ratings
Positive64.5%
Neutral3.2%
Negative32.3%
Written reviews41 reviews
Positive58.5%
Neutral9.8%
Negative31.7%

RDTap

Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

1 purchases

RTA Audio

One-time1
  • Upgrade to full version$14.99
None

RDTap

No in-app purchases

Questions

Is RTA Audio free?
RTA Audio is free to download, with in-app purchases available.
Is RDTap free?
RDTap is free to download, with no in-app purchases.
Do RTA Audio or RDTap have ads?
Neither RTA Audio nor RDTap shows ads.
Which is updated more often, RTA Audio or RDTap?
RTA Audio ships an update every 28 months, and RDTap fortnightly. Most recently, RTA Audio was updated on October 15, 2026 and RDTap on October 4, 2026.

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