RT60 vs WOW Filterbox
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RT60
This tool measures reverb decay time across octave bands using pink noise. It conforms to ISO 3382 standards for room acoustics and can display results from 50ms to 4 seconds. Save measurement graphs for reports.
- Measures reverb decay time
- Octave band analysis (63Hz - 4kHz)
- Conforms to ISO 3382 standard
- T20 and T30 measurement methods
- Adjustable decay time range (50ms - 4s)
- Save measurement graphs
- Microphone calibration
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Now you can have an RT60 measurement tool for the iPhone. Another in the series of acoustic analysis and test applications from Studio Six Digital, RT60 measures reverb decay time for each octave band, 63Hz - 4kHz, by pulsing pink noise on and off, filtering the incoming signal by octave band, and measuring the timing of the decay of each octave band. RT60 conforms to international acoustics standard ISO 3382 for measuring room decay time (RT) using either the T20 or T30 method. RT60 will measure down to 50ms, and up to 4 seconds. Results are displayed for each band above the band, and the overall RT60 is calculated and displayed on the top of the screen. RT60 requires at least 25dB of headroom between the noise floor of the environment, and the level of the pink noise for T20 analysis. Turn up the amplifier to get more headroom. To use RT60, connect the iPhone output to the input of an amp and speaker, and carefully turn up the level after you tap the Generator icon. RT60 smoothes the results of several readings to get a more stable result. *** Screen Graphics The red bars are the current SPL level for each octave band. The thin black bars show the most recently measured maximum and minimum dB levels for the octave band that the RT60 calculation is using. The vertical yellow bars show the decay range that is available. Note that in some situations, you may not be able to overcome the ambient noise level in the room to get a good reading in every band. *** Calculations If a valid RT60 time can be computed, it is shown above the yellow bar. If it cannot be computed, no bar or value is shown. When your analysis is complete, you can save the graph image to your photo roll to include in a report. *** Calibration & Microphone Like all of the Studio Six Digital apps, RT60 can be calibrated. We set this field to the typical iPhone value, but if you have access to a calibrated SPL meter you can adjust this number as needed. There is a field to select Internal or External microphone. When Internal is selected, a compensation network is used to compensate for the response of the built-in or headset mic. When External is selected, no compensation is done. See our web site for more detailed information. Also, check out our other great audio and acoustics apps: AudioTools, SPL, SPL Graph, for recording SPL over time, RTA, ETC, FFT, Generator, and Speaker Pop. And, if you are looking for a great range of high-quality, professional, audio test equipment, check out iTestMic, iPrecisionMic, or liAudioInterface2.
WOW Filterbox
This app offers a creative multi-filterbox with 21 filter types, analog and digital distortions, and powerful modulation options. It includes an integrated player and recorder, XY-pads for parameter control, and supports MIDI and Ableton Link.
- 21 filter types
- Analog and digital distortion
- Step sequencer & wobble generator
- LFO with multiple waveforms
- XY-Pads for parameter control
- Integrated player and recorder
- MIDI support & Ableton Link
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WOW2 is here! With a future-dripping user interface, 21 incredible filter types with the famous vowel mode. With distortions that cover your tracks with gas and put them on fire. Modulations that cause more trouble than your modular dark room. And finally that warm and juicy sound, that you were looking for. - 21 Filter types like Lowpass, Bandpass, Highpass, Bandreject, Comb and much more. Low pass types up to 48 db, including flavors like SVF, Diode Ladder and Transistor Ladder. The filters and distortions have been designed for best harmonics without aliasing, for high definition audio quality. - Three different analog modeling overdrives and four digital distortion functions are included. Use them pre or post the filter. - Modulation is power. Power is ***. Create stunning trance gates with the step sequencer, do some giant wobbles with the wobble generator or let all the modulators interact with each other. The LFO offers many different wave forms, restart options and sync flavors. - Presets are just one click away. Randomize presets to inspire yourself. Features at a Glance: • Audio Unit v3 & Standalone • XY-Pads to control 6 Parameters simultaneously • Integrated Player (File Sharing, Music Library, Factory Loops) • Integrated Recorder (div. Optionen: Start/Stop/Sync/Länge) • Live Modus (Inputs & Outputs selectable) • MIDI Support, MIDI Learn & Host Automation • Midi Clock Sync • Ableton Link support • Audioshare Import & Preset Share (iCloud)
Screenshots
Verdict
The clearest difference is price: WOW Filterbox at Free against RT60's $34.99. WOW Filterbox also leads on rating (4.6 vs 3.4) and ratings volume (29 vs 5). RT60's advantage is in-app purchases (none vs 1) and device support (3 vs 1). On review sentiment, update cadence and ads 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
WOW Filterbox is free to download; RT60 costs $34.99 up front. WOW Filterbox sells 1 one-off in-app purchase. RT60 asks for nothing beyond the download.
WOW Filterbox holds the better App Store score, 4.6 against 3.4. That said, the two scores are not equally well evidenced: WOW Filterbox has 29 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 67% of RT60's written reviews are positive against 64% of WOW Filterbox's, so the app with the better star average is not the one people write more warmly about.
RT60 ships an update every 6 months, WOW Filterbox every 4 months. The most recent releases landed on September 21, 2026 and September 19, 2026 respectively.
| Parameter | RT60 | WOW Filterbox |
|---|---|---|
| Price | $34.99 | Free — better |
| Rating | 3.4 (5 ratings) | 4.6 (29 ratings) — better |
| Positive reviews | 66.7% of reviews — better | 64.3% of reviews |
| Number of ratings | 5 | 29 — better |
| Update frequency | Every 6 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 15.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 27 MB | 83 MB |
| Age rating | 4+ | 4+ |
| Developer | Andrew Smith | Sugar Bytes GmbH |
Customer experience
RT60
WOW Filterbox
In-app purchases
RT60
No in-app purchases
WOW Filterbox
- WOW Full Version$19.99









