AudioTool
AudioTool: Fully Featured SPL, dB and Sone Meter, plus Audio Spectrum Analyzer
- Total installs
- 64,157
- Installs / day
- 0
- Rating
- 4.6★
- Released
- 24 Oct 2010
- Last update
- 29 Sept 2026
- Countries
- —
exact · Play shows 50,000+
since last crawl
1.8K ratings · 359 reviews
16y ago
v8.8.1 · 13d ago
not checked yet
Install history
exact counter from Google PlayInstalls per day · last 90 days
Change timeline
No changes recorded yet. We compare every crawl with the previous one and list title, icon, screenshots, description, version, price and availability changes here.
Country availability
Availability has not been checked for this app yet. “Check all countries” looks the app up in about 140 Google Play storefronts and shows where it is live, listed but not installable, or missing — plus any country-specific (custom) store listings.
Top countries
estimate · charts of 12 OctMost downloads likely come from 🇮🇳 India (~32%), out of 121 countries where it is charted.
Estimated from top-chart positions weighted by each country’s Google Play market size. Countries where the app is not in a chart are not shown, so small markets may be missing.
Top chart positions
as of 12 Oct| Chart | Country | Rank | Change |
|---|---|---|---|
| Top paid · Music & audio | AG | #17 | = |
| Top paid · Music & audio | AL | #17 | = |
| Top paid · Music & audio | AM | #17 | = |
| Top paid · Music & audio | AO | #17 | = |
| Top paid · Music & audio | AW | #17 | = |
| Top paid · Music & audio | AZ | #17 | = |
| Top paid · Music & audio | BA | #17 | = |
| Top paid · Music & audio | BD | #17 | = |
| Top paid · Music & audio | BF | #17 | = |
| Top paid · Music & audio | BH | #17 | = |
| Top paid · Music & audio | BJ | #17 | = |
| Top paid · Music & audio | BO | #17 | = |
| Top paid · Music & audio | BS | #17 | = |
| Top paid · Music & audio | BW | #17 | = |
| Top paid · Music & audio | BZ | #17 | = |
| Top paid · Music & audio | CI | #17 | = |
| Top paid · Music & audio | CM | #17 | = |
| Top paid · Music & audio | CV | #17 | = |
| Top paid · Music & audio | DO | #17 | = |
| Top paid · Music & audio | DZ | #17 | = |
| Top paid · Music & audio | EG | #17 | = |
| Top paid · Music & audio | FJ | #17 | = |
| Top paid · Music & audio | GA | #17 | = |
| Top paid · Music & audio | GH | #17 | = |
| Top paid · Music & audio | GT | #17 | = |
| Top paid · Music & audio | GW | #17 | = |
| Top paid · Music & audio | HN | #17 | = |
| Top paid · Music & audio | HT | #17 | = |
| Top paid · Music & audio | IS | #17 | = |
| Top paid · Music & audio | JO | #17 | = |
| Top paid · Music & audio | KE | #17 | = |
| Top paid · Music & audio | KG | #17 | = |
| Top paid · Music & audio | KW | #17 | = |
| Top paid · Music & audio | KZ | #17 | = |
| Top paid · Music & audio | LA | #17 | = |
| Top paid · Music & audio | LB | #17 | = |
| Top paid · Music & audio | LK | #17 | = |
| Top paid · Music & audio | MA | #17 | = |
| Top paid · Music & audio | MD | #17 | = |
| Top paid · Music & audio | MK | #17 | = |
| Top paid · Music & audio | ML | #17 | = |
| Top paid · Music & audio | MU | #17 | = |
| Top paid · Music & audio | MZ | #17 | = |
| Top paid · Music & audio | NA | #17 | = |
| Top paid · Music & audio | NE | #17 | = |
| Top paid · Music & audio | NG | #17 | = |
| Top paid · Music & audio | NI | #17 | = |
| Top paid · Music & audio | NP | #17 | = |
| Top paid · Music & audio | OM | #17 | = |
| Top paid · Music & audio | PG | #17 | = |
| Top paid · Music & audio | PK | #17 | = |
| Top paid · Music & audio | PY | #17 | = |
| Top paid · Music & audio | QA | #17 | = |
| Top paid · Music & audio | RS | #17 | = |
| Top paid · Music & audio | RW | #17 | = |
| Top paid · Music & audio | SN | #17 | = |
| Top paid · Music & audio | SV | #17 | = |
| Top paid · Music & audio | TG | #17 | = |
| Top paid · Music & audio | TJ | #17 | = |
| Top paid · Music & audio | TM | #17 | = |
Show all 60 chart positions
App manifest
Read this app's manifest from Google Play: permissions, declared SDKs, components and AdMob app ID. Saved analysis appears here automatically.
Data safety
declared by the developer on Google Play- No data shared with third parties
- No data collected
This is the developer's own declaration, summarised from the Play listing. The permissions below show what the app is technically able to access.
Permissions
6 in 4 groups5 Sensitive1 Notable0 Routine
What this app can do with your phone
- Record sound using your phone's microphone
- Read photos, videos, and other files saved in your phone's shared storage
- Add, change or delete photos, videos and other files in your phone's storage
Photos/Media/FilesSensitive2
Access to photos, videos, music and other files stored on your device
- Read photos, videos, and other files saved in your phone's shared storageread the contents of your USB storage ·
READ_EXTERNAL_STORAGE - Add, change or delete photos, videos and other files in your phone's storagemodify or delete the contents of your USB storage ·
WRITE_EXTERNAL_STORAGE
StorageSensitive2
Access to files, photos and media saved on your phone's storage
- Read photos, videos, and other files saved in your phone's shared storageread the contents of your USB storage ·
READ_EXTERNAL_STORAGE - Add, change or delete photos, videos and other files in your phone's storagemodify or delete the contents of your USB storage ·
WRITE_EXTERNAL_STORAGE
MicrophoneSensitive1
Access to your phone's microphone to record sound
- Record sound using your phone's microphonerecord audio ·
RECORD_AUDIO
OtherNotable1
Access to miscellaneous device features that don't fit other categories
- Change volume and choose which speaker or headset plays soundchange your audio settings ·
MODIFY_AUDIO_SETTINGS
Sensitive = can reach personal data, location, camera/mic or act on your behalf. Notable = changes how your device behaves. Routine = normal for almost every app. Source: Google Play's permission list for all versions of this app.
Store listing
Full description
SPL (deciBel) Meter featuring RT60, Leq, Sone, Spectrum Analyzer, Spectrogram, Chart Recorder, Signal Generator, Polarity Checker, and Mic calibration.
Recommended by "Sound and Vision" magazine. Loved by Audio Engineers worldwide: check out the Reviews!
Features: 1/1, 1/3, 1/6 & 1/12 octave RTA modes, Leq (wideband, Octave, variable duration), Sones (Loudness), RT60 (wideband, Octave), Peak Store, Spectrogram, Waterfall, Peak frequency, Impulse, Fast, Medium & Slow filters, Flat & A/C Weighting and film industry X Curve, Averaging, SPL Chart Recorder, Noise Criteria (NC and NR), White/Pink Noise, Sine, Square, Triangle, Sweep, Log Sweep, Warble, Ramp and Impulse signals & loudspeaker polarity checker, L/R select. RTA Store & Load, Hann windows, pinch to zoom, scroll to center.
Examples of recent updates (April 2019):
v8.0 New Feature: Load one or two stored spectrum files and display both alongside the realtime data.
v8.1 New Generator option: swap phase of Right stereo signal
v8.2 New Menu option "Set Resolution" allowing to set 4096, 8192, or 16384 sample lengths
v8.3 New 1/12 Octave RTA mode
Exclusive ISO 1/3 Octave Calibration - can correct for your phone's microphone response. Octave calibration discs are moved up or down to obtain a flat response, and match the overall SPL to that of an external meter. Save/Restore of Cal files (popular Dayton Audio iMM-6, MicW i436, also supported).
Use: gig measurements, home theater, acoustics, car, etc.
AudioTool FFTs sets of microphone samples. Aliasing reduced by Hann windowing. SPL calculated in realtime. Spectra may be saved, then loaded and displayed with the live spectrum. The "Store" button stores the current live spectrum - "Load" shows a list of stored spectra to select.
To hide the buttons, tap the screen. To restore them, tap again. To zoom the scale, pinch the screen. To move the scale, drag it up or down (left or right).
A pair of cursors can be shown: each can be moved to any position, and will display the SPL & time/frequency values there. The cursors can be turned on and off in the Menu.
The loudspeaker polarity checker can be used to check whether a loudspeaker is wired in phase: connect the AudioTool output to the speaker under test, select "Polarity" from the signal generator screen, then return to the RTA screen. If the speaker is out of phase (polarity reversed) AudioTool will show "Pol ---", otherwise "Pol +++" if the speaker is in phase.
The Noise Criteria function shows a set of NC contours overlaid on the 1/1 Octave RTA display and the calculated real time current NC value is also shown.
The Chart Recorder shows a moving trace of the SPL measurements over the last few minutes.
RT60 measurements (how much reverberation or echo there is in a room or hall) can be made using the "RT60" function, triggered using a loud clap (or similar) to or with Pink Noise from the AudioTool generator.
The Signal Generator generates White and Pink Noise, Sine, Square, Triangle and Ramp waves, Sine Linear and Log Sweeps, Warbles and Impulses. The generator uses multiple cycled buffers, refreshed randomly so ensuring truly random White and Pink noise.
The frequency accuracy of the Signal Generator is typically around 1%. Sine wave fidelity is good throughout most of the audio range. Other signals' leading and trailing edges will show ringing and decreasing frequency response artifacts in the upper ranges, depending on the cellphone being used.
The above description is a very terse version of the Online Manual, which may be accessed here:
https://sites.google.com/site/bofinit/audiotool
The friendly AudioTool Discussion Group can be used to request features, find/request Calibration files, or report problems. Feedback is always welcome:
http://groups.google.com/group/audiotool-discussion-group
Disclaimer: AudioTool's performance depends on your Android hardware, and is not guaranteed to meet any audio measurement or safety standards.
What's new
v8.8.1 Adjust position of NC/NR values for visibility Fix interval clicks in Warble signal generator
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