are there any free spl meter downloads that are actually accurate for my computer or iphone?

are there any free spl meter downloads that are actually accurate for my computer or iphone?
No.
dave
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1999 Buick Park Ave Ultra
Head Unit: JVC KWHDR720
EQ: Audiocontrol EQL
Front Stage: Hybrid Audio Technologies Imagine 5.25
Sub Stage: In process (will be Boston G310)
Amp: Boston Acoustics GTA-704 4 Ch
Rear Fill: Boston SE953 6X9's
Nope
Head unit: Kenwood Excelon KDC-X996
Front stage: Alpine Type X PRO mids Vifa Neo 1" silk tweeters
Front stage amp: PPI Bk800.4
Subs: SSA XCON 12's in 4.5 cubes tuned to 34hz
Sub amp: PPI Bk1300.1
Sound Deadening: Second Skin Damplifier Pro, Spectrum, and Sludge
Team SSA
Check your app store. They're of limited use, but as long as you only use the measurement as a reference for your personal use they're handy. I use Sound Meter for Android. It maxes at 100 dB on my Motorola Droid RAZR and on my previous Droid X. Other brands of phones max out at varying levels, some of which are so low they really are useless for the car.
Small town service, family owned and operated.
Click for my CDT Audio dealer store, Clarion, JBL, Precision Power, Massive Audio, Diamond Audio, Metra, and much more
my system: Clarion CX501, JBL MS-8, Massive Audio NX4, Xtant 1.1i, CDT DRT-26A, ES-020, ES-6MO, CL-62SL, JBL MS BassPro SQ

what would be a cheap / good / reliable / accurate spl meter?
You can get an SPL bluetooth meter, and the numbers will show up right on your phone, and they are accurate. Too bad accuracy isn't free.

well then what would be a good meter thats affordable
Spl labs
97 4runner, 3RZ, 5 Speed
Headunit: Pioneer DEH-P9800BT
Mids: Lanzar 6m
Tweets: Crescendo CCX
Fronts Amp: Alpine PDX4.100
Sub Amp:Hifonics BRZ1.1700D
Substage: 18" SSA ZCON
Electrical: 160 Amp Alt, Duralast Gold, C&D270FR, 2/0 Throughout

how much and max db?

makeitlouder.com has an SPL meter that's as accurate as the DMM you hook it up to. If you don't own a good DMM it's probably worth getting that already calibrated with the sensor from him. That's your least expensive option that's accurate and good up to real competition level SPL.
There's some RTA software that you can pirate (or pay for) but will require an accurate microphone and a good sound card to make work. Google is your friend there, various DIY audio sites have volumes of reading on the subject of rta software and hardware options.
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