FFT vs MX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FFT
Analyze audio with high-resolution frequency and amplitude graphs. Features include a signal generator, cursor readouts, and adjustable graph smoothing. Save and export your analysis results.
- High-resolution amplitude vs. frequency graph
- Built-in low-distortion signal generator
- Adjustable graph smoothing and decay time
- Cursor readout for dB and frequency
- Save and export analysis graphs and data
- Peak tracking for highest frequency identification
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FFT is a high-resolution audio analysis tool for the iPhone and iPod touch. It uses the Fast Fourier Transform to analyze incoming audio, and displays a very detailed graph of amplitude vs. frequency. Use this app with the built-in iOS device microphone, or upgrade to our iAudioInterface2 or iTestMic for a complete professional solution. *** Designed for Acoustical Analysis This application has been designed for acoustics work, and so the bins have been normalized to octaves, to get a display that will show a flat line for pink noise. You can control both the level of graph smoothing and decay time, to get as much or as little detail as you require. You can also control the dB resolution of the graph, as well as the frequency range that is displayed. *** Includes Signal Generator Included in this app is the engine from our Generator app, which is a low-distortion, artifact-free signal generator. The signal generator appears as a heads-up display when you tap the icon, so you can see the graph while you adjust the generator. Generate sine waves, square waves (within limits), white noise, and pink noise, optionally in psuedo-balanced mode. All waveforms are generated in real time using high-precision algorithms. *** Cursor Readout Move your finger across the screen to get a cursor to read out exact dB levels and frequencies. *** Touch-GUI Controls Use a vertical pinch-open gesture to expand the dB scale. Use a horizontal pinch-open gesture to expand the frequency scale. *** Graph Smoothing Smooth the graph by octave, 1/3, 1/6, 1/12, or 1/24 octave. Adjust the decay time from 0.5 seconds, for a very fast fluid display, to 8 seconds, or use Peak Hold or Average mode. Average mode is a true equal-weighted average, which can run continuously. *** Peak Tracking Turn on Peak Tracking to have FFT automatically find a label the frequency of the highest peak on your graph. *** Tune the Parameters Set the FFT size from 4096 to 32k points (depending on iOS device) , or select Equal Points Per Octave mode, for high-resolution analysis, even at low frequencies. *** Calibration FFT comes calibrated for the typical iPad, iPod touch, or iPhone microphone, and you can adjust the calibration. Microphone compensation files tailored to each iOS device are automatically applied. *** Save and Recall When your analysis is complete, you can save the graph image to your photo roll to include in a report, or export the data in an XLS file. *** Display Multiple Graphs Show a recalled graph on the screen in a different color. *** Difference Mode Use a stored graph as a baseline that is subtracted from the current graph in real time. *** RTA or FFT? If you are wondering if you should download this app or our FFT app, check out our website, we have a page devoted to this topic. *** Other Audio Apps Also, check out our other great audio and acoustics apps: AudioTools, our premier suite of audio and acoustics analysis apps, SPL, SPL Graph, for recording SPL over time, RTA, RT60, Generator, and Speaker Pop.
MX
Control your personal monitor mix directly from your mobile device. This app offers intuitive remote control for volume and panning of input channels to auxiliary buses, with customizable groupings for easy adjustments during performances. Ideal for musicians and performers seeking flexible and personalized monitoring.
- 4 customizable MCAs for group channel adjustments
- Control over Mono and Stereo Bus sends
- Individual volume and panorama control
- Portrait/landscape orientation support
- Remote control for audio mixers
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MX-Q – Personal Monitoring at your Fingertips Take full control of your monitor mix, right from your mobile device. MX-Q gives musicians, performers, and creators a fast, intuitive way to make their personal monitor mix for Midas M32, M-AIR, Behringer X32, and X-AIR audio mixers. Not only does MX-Q allow individual volume and panorama remote control for all input channel sends to all aux-buses, but it allows virtually grouping channels into MCA’s (mix control associations). There are 4 MCA’s that can be populated independently in every app instance, making level adjustments during performance easy and fit for every musician’s needs. Whether you’re on stage, in rehearsal, or in the studio, MX-Q makes personal monitoring simple, flexible, and fully customizable. Features • 4 customizable MCAs (quick adjustment to multiple channels at once) • Control over Mono and Stereo Bus sends and panning • Portrait/landscape orientation Perfect For • Musicians who want full control of their in-ear or wedge mix • Bands needing fast, reliable personal monitoring • Rehearsal spaces, houses of worship, and touring rigs Compatibility • Compatible with Behringer X32 and X AIR series mixers as well as Midas M32 and M AIR series mixers • Requires the mobile device and mixer to be connected to the same Wi-Fi network
Screenshots
Verdict
The clearest difference is review sentiment: FFT at 86% against MX's 16%. FFT also leads on rating (4.0 vs 2.1) and iOS requirement (15.0 vs 17.0). MX's advantage is price (Free vs $10.99) and in-app purchases (none vs 1). On ads 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
MX is free to download; FFT costs $10.99 up front. FFT sells 1 one-off in-app purchase. MX asks for nothing beyond the download.
FFT holds the better App Store score, 4.0 against 2.1. That said, the two scores are not equally well evidenced: MX has 279 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 86% of FFT's written reviews are positive against 16% of MX's.
FFT ships an update every 6 months, MX every 2 weeks. The most recent releases landed on October 18, 2026 and October 17, 2026 respectively.
| Parameter | FFT | MX |
|---|---|---|
| Price | $10.99 | Free — better |
| Rating | 4.0 (6 ratings) — better | 2.1 (279 ratings) |
| Positive reviews | 86.1% of reviews — better | 15.8% of reviews |
| Number of ratings | 6 | 279 — better |
| Update frequency | Every 6 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 30 MB | 17 MB |
| Age rating | +4 | 4+ |
| Developer | Andrew Smith | Empower Tribe Innovations DE GmbH |
Customer experience
FFT
MX
Bugs and requests
FFT
Not enough reviews yet to summarise bugs or requests.
MX
Reported bugs
19 issues- App crashes on launch or connection
- Screen auto-locks during active use
- Connection drops frequently during performance
- IP address not saved between sessions
- App freezes on scanning or connecting screens
Show 14 moreShow fewer
- Faders unresponsive or slow to react
- Touch controls frozen or glitchy
- Horizontal scrolling inconsistent and difficult
- Parameter transfer takes excessive time
- App doesn't auto-reconnect after phone sleep
- Incompatible with iOS 16+ and iPhone 16
- Scan function doesn't detect mixer on network
- Manual IP entry not accepted despite correct address
- App crashes when switching between mix screens
- Settings not retained between sessions
- Channel display shows wrong labels
- Vertical mode layout broken and unusable
- Latency issues with fader adjustments
- App requires force close and reinstall to function
Requested features
17 requests- Restore signal level/VU meters for each channel
- Bring back channel grouping and filtering capabilities
- Add ability to keep screen from auto-locking during use
- Implement IP address saving and auto-reconnection
- Restore previous UI layout and design
Show 12 moreShow fewer
- Add channel numbering display
- Include dB level indicators on faders
- Add pan control functionality
- Implement compression and gate controls
- Add EQ options for individual channels
- Create user profile saving for different musicians
- Add color-coding options for channels
- Implement page-based navigation instead of scrolling
- Add password protection for main mix access
- Reduce master fader screen real estate
- Improve touch sensitivity and responsiveness
- Add support for scribble strip customization
In-app purchases
FFT
- Reference Curve Files$9.99
MX
No in-app purchases









