SPLnFFT Noise Meter - Reviews, Revenue and Downloads - Apple App Store

Description

SPLnFFT is a sound level meter (noise meter) for your iPhone or iPad with many advanced features: frequency analyzer, frequency meter, test signal generator, dosimeter, ...

This soundmeter App is the only one for iOS recommended by the "Laborers' Health and Safety Fund of North America".
Here are extracts from other reviews:
"our favorite sound measurement app" SafetyAwakenings.com
"SPLnFFT is comprehensive, easy to use" TapeOp.com
You will find more reviews here: https://www.facebook.com/SPLnFFT

For daily use, a very simple interface displays the level of exposure: if orange or red, protect your ears !
Professional users will take advantage of a wide range of accurate and reliable measurements: Leq, peak, L10, L95, taktmaximal, frequency analysis, histogram, dosemetering, ... A&C weightings are compliant with ANSI® S1.42 standard. "468" refers to ITU-R 468-4

*** Some KEY INFORMATION *** :
- you absolutely need to allow access to microphone to use this App
- screen rotation must be un-locked
- there are built-in help messages (speech bubble). Need more ? Contact us !: email, blog, Facebook,...
- do not expect to measure as low as 0dB(A) in a quiet room, for these 2 reasons: 30-130dB(A) is the standard usable range for sound level meters and anyway a standard quiet room is around 30dB(A) whereas a typical anechoic chamber is 10 to 20dB(A)

Top digital display is for measurement of sound power in 'slow' mode (averaged on 1s). Central analog display is for 'fast' mode (averaged on 1/8th s). But it can display 'slow' mode as well on request: just click on 'fast' label.
Peak and average values are displayed below and are held until you touch the 'reset' label. The videos on Youtube reveal more details.

Bottom view is a real time FFT (frequency analysis). You will notice that predominant frequency and next one are highlighted. Their frequencies and relative power are displayed on the right. If your input signal is a pure tone then this App will lock on its frequency and display a very accurate result.
Green line is the result of a real time FFT done with 1024 points. Purple line is the averaged FFT (exponential filtering done on power of each frequency). Blue line is a copy of what the purple line was when the user froze the display the last time.
A test tone at 1kHz or a white noise or a pink noise can be generated and sent to right and/or left outputs (select the type you want in BEEP tab). This FFT view - more precisely an upsized version of it - can be exported as a picture in your own photo library, using the camera button (when display is frozen only). This picture can be exported in a mail as well.
The display can be flipped upside-down to ease reading: just rotate your iPhone while holding it vertically.

As for ALL sound meters (thus including this one and all others at any price), calibration is suggested if you want to reach extreme precision. This is enabled in this App thanks to a slider to apply some compensation and to three non volatile memories (choice to be made in MIC. tab). How to ? For calibration, you need and external reference, either a calibrated sound meter, or a calibrated noise source.
Note as well that the tiny embedded loudspeaker cannot reproduce extreme frequencies. Thus if you want to hear a real white or pink noise, you will need to use a quality headphone or HiFi system.

This App was designed seriously for our own needs, by a signal processing expert, and is regularly updated to maintain accuracy and reliability.

***** Any comment, any feedback ? Click on 'support' in iTunes: there is a blog for this. You can even contact us directly by email or through the dedicated FaceBook page (note 'send email' top right) *****

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In-Apps

Export raw data to Dropbox + PRO features

£4.99

Screenshots

User Rating

4.56 out of 5

16 ratings in United Kingdom

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Ratings History

Reviews

Was the best…

…until landscape mode got stuck. Now unusable. No way to change settings.

Excellent - slight bug to fix

Excellent - but slight bug on iPhone 11 atm - some text is too large resulting in cropped readings eg 10... instead of 100.1 or whatever. Ability to change text size would be useful. (Edit: Thank you - look forward to the update - it’s a great app so apologies for only giving a review once a bug turned up)

Rock solid dBA meter on your phone!

I’ve had this installed on various iPhones over the years and it’s a superb / rock solid app for getting accurate min/max/average dB measurements. It’s so handy if you’re somewhere extremely noisy and you want to know how badly your ears are taking a pounding, how loud an appliance is compared to others (or what it says in the manual) or if you’re in your studio and you want to check if you’re listening at safe levels. As good as pro hardware and probably a lot more user friendly and intuitive tO use. Thank you so much for taking the time to write it and get it up on the App Store.

Fantastic, precise instrument

Invaluable bit of kit when you need it.

Very happy!

Purchased this after searching for best app reviews. It does everything I expected and I trust the results. Used with iPhone. Use it as a spot check wherever I'm working. Would like to capture results, not sure how or if I can do this. Anyone know? Excellent Peter

Steve Crooks

A very usefull and convenient app, gives an effective guide value when you do not have the neccessary test equipment to hand.

As accurate as a calibrated Db meter

I just tested this against a calibrated Decibel meter I borrowed. It was mostly exactly the same with a max difference between them of only 0.2 Dba (To get this level of accuracy on an iPhone 6s add 1.2db of mic gain in the app settings). Without this change it was within 1.3db of the calibrated meter which is still good. My phone is in a tough case so the 1.3db difference could be to compensate for the case. Overall I can't recommend it enough. As accurate as a calibrated sound meter.

Spl

Top marks for this app!

Dr Beg

Nice application. I have used it in movies to assess sound levels. Can you please add worked examples, clear usage and meanings of the terms used in this app as a help file? Thanks

Review

Super App, very useful.

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