SPL Music App Review (iOS, $7.99)

  • Category: Music
  • Publisher: Andrew Smith
  • Updated: Dec, 03 2008
  • Version: 3.7
  • Size: 6.43 MB

Languages: English

Seller: Andrew Smith

-- Updated for iOS 7
-- Updated calibration for all new iOS devices

Customer Ratings

Current Version:
1 Ratings
All Versions:
101 Ratings


SPL is a professional-grade digital sound level meter (decibel meter) for your iPad, iPhone or iPod touch. It includes all of the modes, filters, and features that you would expect from a professional ANSI or IEC Sound Level Meter. All filters and averaging modes meet or exceed the criteria for ANSI Type 1 or better. SPL is created from the same team who brought you the Audio Toolbox and ATB Plus.

Graphics -- There are three user-selectable options for the front panel. These include aluminum, dark metal, and plain. The dark metal option, with blue digits, is designed to work best in dark environments. Use aluminum or plain in daylight. To change the skin, just tap the small "i" icon in the bar on the top of the screen.

Store Results -- Uses the same powerful Save / Recall engine as our premier app, AudioTools. Allows storing GPS and time-stamped results, and exporting them to your computer.

You can also use SPL with our calibrated iPhone measurement mic, iTestMic, or iAudioInterface.

The screen flips if you turn the phone upside down, so that you can point the built-in iPhone mic directly at the sound source.

*** Modes: Slow, Fast, Impulse, Peak, and Leq.

*** Filters: A and C weighting, and 10 octave band filters.

*** Includes a resettable Max field to track the highest reading.

*** Includes a reference field (except in Leq mode) so that you can set a reference level and do seat-to-seat comparisons.

The SPL meter can be fully calibrated. It comes preset with the calibration for a typical iPad, iPhone, and iPod Touch. Most iOS devices will be within a few dB of this reading. If you have access, even temporarily, to a calibrated sound level meter, just use the calibration field on the settings scree to match the meter, and you will be accurately calibrated.

Also, see our other professional-grade audio apps: AudioTools, our premier suite of professional-caliber audio and acoustics test apps, Speaker Pop, to test speaker polarity, and RTA, a real-time analyzer for the iPhone.

And, we have released a calibrated, accurate measurement microphone, iTestMic, that allows full professional results.

This will allow measuring a range from approximately 30 dB SPL to 130 dB SPL. Each mic will include a calibration factor that you will enter into the SPL app for calibrated measurements. This mic will also work with Speaker Pop, our speaker polarity tester, FFT, RTA, ETC, and other acoustical measurement apps in our AudioTools app that is available now.

Also, see our iAudioInterface2 system, which supports any pro test and measurement mic.

Now includes an iPhone internal mic compensation filter, to cancel out the low-frequency roll-off present in the iPhone and other iOS devices.

See our other audio apps, including AudioTools.

Customer Reviews

  • SPL - Studio Six Digital

    by Digione

    Great app, really easy to use and quite accurate without additional calibration. Compared it to Radio Shack SPL meter and they are both very close.

  • Crash at 66.6db

    by Sarlac

    Like the title says this app apparently likes heavy metal or satan or both. It has crashed several times frozen on 66.6db. \m/

  • An excellent tool!

    by Flying Faders

    My only wish: I'd love to have the analog-style UI from their $.99 younger brother SPL Meter.

  • Best db meter on for iPhone.

    by gpmark

    Best db meter on for iPhone. I've downloaded and used them all. This one is easy to use, has the most parameter settings, and the ability to record peaks. It is however, strictly a db meter. Some other meters show frequency and plots of readings over time. These would be nice features to see added. Ther one feature I think is clearly missing is the ability to utilize the capabilities of the iPhone to actually transmit the captured data. If this were coupled by the ability to record real time readings this would be an awesome application. Having spectral analysis, and perhaps capture, would make it perfect.

  • Great App, but small issue...

    by brodrummer

    I install professional audio and run sound at various events and I've been using this app for over a year with great success. The readings are very accurate and the app is easy to use. I'm glad this app came out because it is easy to check SPL on the fly without carrying a meter around with me everywhere I go. However, since the latest version came out, it has been crashing my phone every time I use it. It freezes, and my phone becomes completely unresponsive. I cannot even reboot. I would have gave it 5 stars except for this problem. Please fix this app because I use it almost weekly. Thanks.

  • SLM exceeds expectations

    by The Audio Bug

    To those who have written the previous 3 reviews: I am a professional acoustical consultant and make my living with very expensive, very accurate test equipment. While the sound measurement applications currently available for the iPhone are definitely not in the class of Type 1 sound level meters or real-time analyzers, they do indeed offer real value. To compare any of these platforms with a Radio Shack sound level meter is an absolute farce. I've calibrated both this SPL meter and Faber Acoustical's software to my $1,800.00 Ivie IE-35 Type 1 meter and found that, within certain limitations, they both track my provessional equipment with excellent accuracy. Same goes for the Studio Six Digital RTA software. The main limitation is that of iPhone hardware. While the microphone on the 3G version of the iPhone is quite good, the low frequency response does sag somewhat. Not the 25 dB that one reviewer suggested but something on the order of 5 - 6 dB. Given the overall cost of the iPhone/software package (somewhere between $210.00 and $230.00), the performance is quite astounding. I wouldn't use this package to support a court case but it does have excellent application in casual use. The true value is that in addition to being fairly accurate, it's always with me since it's my cell phone and a pretty versatile measurement platform. I'm looking forward to the dedicated microphone which is expected to be available in Jan 09. For those who haven't been able to get the meter running, read the directions! If you want accurate readings, have the unit calibrated against a known standard such as a calibrated professional sound level meter. By the way, Andrew Smith, the author of this product, has long been involved in the design and manufacture of professional audio measurement equipment such as the Audio ToolBox now marketed by Sencore. He knows what it takes to make a good measurement device. Bravo Andrew!

  • It Works

    by melosh


  • extremely useful

    by SoundsOKtoMe

    It's amazing that anyone gives this application anything less than a stellar review. It does what it's supposed to do, does it well and reasonably accurately. It is preposterously inexpensive. And it's always here, on my phone, ready to use whenever I need it. I do wish that the reviews were flagged and votes not counted when people simply can't figure out how to use it or don't like the way it looks. It renders the "5 star" voting approach meaningless for those of us who are looking for tools that work. It's a tool, not a toy or a game.

  • Context

    by s0uls3arch3r

    I wish people would write reviews within the context of the App. This is an SPL meter that works on you phone. IE a reference tool when you're caught without your pro gear. And as such it works very well. Also, there's a reason for a 105 db threshold on your iPhone. Someone is holding a phone to their ear as you transmit a +db signal. Granted I'm sure no phone manufacturer would knowingly create a reciever that would reach beyond pain and damage thresholds. C'mon people think!

  • Owner

    by phoenix1951

    I agree with review 4 very nice software you have your phone with you all the time but not your audio tool box or ivie or other professional tools But you do have your phone John

  • Pretty sweet app

    by Antnii

    I'm not sure if I'm using it rite or if it's accurate but it's fun to mess with and I was wondering what's the max reading on this thing everything I've tried it on came to 107.6db can it go higher??

  • Amazing

    by Gollnick

    I have recently had the opportunity to compare with a very calibrated instrument and was very favorably impressed. This thing works very well. I also checked my Radio Shack meter at the same time and it's good right around 1KHz which is where -- if you read its instructions -- it is calibrated. The Radio Shack SPL meter, by the way, while a bargain for the price and quite good for what it is, is not a good tool for tuning subwoofers at all. This iPhone ap, while better, still isn't the best for subs either with the built-in mic, but worked much better with an external. Also, this ap's A-weight filter is better than Radio Shack's. In conclusion, this ap is a bargain for the price and so handy to have with you. A+. My one suggested improvement: a logging mode which logs SPL at selectable intervals -- minutes and seconds -- and then can e-mail the log out in csv format with time and SPL reading.

  • spl

    by julian326

    i cant get it to wrk?? i put the micro phone next to the sound and it doesnt read it?? need help!!

  • Horrible color scheme

    by Bryanacarter

    I have loved this app previously. In fact, I would have always given this app five stars until this version. I have been using this app for years now and I have always used the 'dark metal' color scheme. Now the only option is white. The white color option is TERRIBLE!!!!! As a foh guy, I use this app a lot. But I think I will be looking for another app because the white color scheme adds extra light to foh and the white is extremely harsh on the eyes. If you have not updated to the newest version, don't. It's not worth it.

  • SPL

    by Artsonic

    Big battery drain

  • Ugh!

    by Peejayfixie

    The new appearance hurts my eyes. Please let me downgrade!

  • Does not have the accuracy of professional SPL for tuning home theater systems

    by Sekhar

    I compared it to a SPL from Radioshack and it does not even come close to being accurate. Specifically for tuning subwoofers it is off by 25db.

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