RTA vs AUDIIO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RTA
Analyze audio frequencies, test speakers, and tune rooms with this professional-grade acoustical analysis tool. It offers octave and 1/3 octave modes, peak hold, and averaging, with automatic microphone compensation for accurate results.
- Real-time acoustical analysis
- Octave and 1/3 Octave modes
- Peak Hold and Average modes
- Automatic microphone compensation
- Save, recall, and export graphs
- Interactive touch GUI
- Noise curve overlays
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A Real Time Analyzer for the iPhone, iPad and iPod Touch. Test your speakers, tune your room, do acoustical analysis work or just have a better understanding of audio frequencies. RTA is a professional-grade acoustical analysis tool. All filters meet or exceed ANSI and IEC Class 1 specifications. Includes Octave and 1/3 Octave modes, with selectable decay times, as well as Peak Hold and true linear Average mode. *** iOS Microphones We have analyzied every iOS device, including all of the iPads, all iPhones, and iPod touches, and have created microphone compensation files that are applied automatically. You can trust the results you are getting, often within just a few dB of a far more expensive analyzer. Calibration is updated regularly, automatically, from our cloud-based calibration database. Upgrade to our iTestMic or iAudioInterface2 to bring your system up to full professional specs. *** Save and Recall Graphs You can save and recall graphs, marked with the GPS location, date & time, and your comment, as well as store the image to your photo roll. Export the data as an XLS formatted file to your computer for inclusion in reports or further analysis. *** Max and Min Bars You can also turn on resettable Max/Min bars (see image #4) to capture peaks. Double-tap to reset the bars. *** Specifications and Devices The internal iPhone mic has a noise floor near 30 dB, and if your are running iOS 6, clips around 120 dB. *** Touch GUI Fully interactive touch GUI features includes scroll up/down, pinch to zoom or compress the vertical dB scale, or swipe horizontally to get a cursor that reads out the exact dB level and frequency across the screen. To make the cursor disappear, swipe it off the graph to the left. The landscape-mode display flips 180 degrees so that you can face the internal mic in either direction. *** Overlay Curves Also included are optional noise curve overlays, in NCB, RC, PNC, NC, X-Curve and NR mode. See picture #2 for an example. Use this feature to get a quick reading on the noise levels in a room. Also includes the cinema large-room X-curve overlay. *** Calibration RTA can be fully calibrated, whether you are using it with the internal iOS microphone, or one of our professional test & measurement mic solutions. And, if you are using iTestMic, the mic calibration is transmitted directly to the app, so you are always calibrated. *** 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. See our other acoustics and audio apps, including AudioTools.
AUDIIO
Visualize audio in real-time with various data graphs like RTA Bar, FFT, and Spectrogram. Offers full octave and 1/3 octave analysis with linear or logarithmic scales. Displays peak and current dB data in a sleek, functional interface.
- Real-time audio analysis
- RTA Bar / Line Graph
- FFT and Spectrogram visualization
- Full Octave and 1/3 Octave analysis
- Linear / Logarithmic scale
- Peak and current dB data
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Audiio is a real-time audio analyzer app. - Visualize audio in various data graph (RTA Bar / Line Graph, FFT, Spectrogram) - Full Octave, 1/3 Available - Linear / Logarithm scale at your disposal - Peak dB data / current dB data - Sleek UI (Functional & Elegant)
Screenshots
Verdict
The clearest difference is review sentiment: RTA at 61% against AUDIIO's 0%. RTA also leads on ads (none vs shown) and chart position (#84 vs unranked). AUDIIO's advantage is price (Free vs $4.99) and rating (4.3 vs 4.0). On update cadence, in-app purchases, monetization model 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
AUDIIO is free to download; RTA costs $4.99 up front. RTA sells 2 one-off in-app purchases and AUDIIO sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
AUDIIO holds the better App Store score, 4.3 against 4.0. Both are backed by a comparable volume of ratings — 27 and 98 respectively. Written reviews complicate that: 61% of RTA's written reviews are positive against 0% of AUDIIO's, so the app with the better star average is not the one people write more warmly about.
Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 31, 2026 and October 29, 2026 respectively.
| Parameter | RTA | AUDIIO |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 4.0 (27 ratings) | 4.3 (98 ratings) — better |
| Positive reviews | 61.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 27 | 98 — better |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | #84 — better | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 30 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Andrew Smith | BetaMatters |
Customer experience
RTA
AUDIIO
Bugs and requests
RTA
Reported bugs
18 issues- App crashes after iOS updates (iOS 13, 15, 16, 17, 18)
- App freezes or crashes on startup
- App only displays half the screen
- App does not save analysis readings to photo roll
- App stops working on older iPads after updates
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- Accessory found/removed loop with iTestMic 2
- App continues to run in background, draining battery
- Calibration not supported for specific iPad models
- App not installing after purchase/update
- App not opening on iPhone 4 after update
- dB/input level is useless after update
- Screen not expanding after updates
- App not compatible with iOS 7
- App crashes when saving screen
- App not working with iMM-6 microphone
- App overcompensates for low frequencies
- App crashes on 3G S after update
- Low frequency response cut due to voice recognition
Requested features
8 requests- Add German language support
- Add NC and NR curves
- Make background mode optional
- Improve compatibility with newer iOS versions
- Add option to overlay readings
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- Add zoom functionality for frequencies
- Improve calibration for external mics
- Add pink noise output
AUDIIO
Not enough reviews yet to summarise bugs or requests.
In-app purchases
RTA
- STC -- Transmission Loss$9.99
- Reference Curve Files$9.99
AUDIIO
- No Ads$4.99






