iPhone Screenshots


Use True Note to test a record player to see if it's playing at the correct speed.

Here's how:

1. Download the True Note app and open it
2. Print and cut out the included turntable strobe disc
3. Place the strobe disc on your record player and start it at the 33 1/3 RPM speed
4. Tap "START" in the True Note app and shine the flashing LED light from your iOS device onto the strobe disc

If your record player is playing at the correct speed, you should be able to make out the individual lines on the strobe disc - and they should appear to remain in the same position (not drifting in one direction).

Many record players have an adjustable speed and can be calibrated with the help of True Note.

Perhaps you're shopping for a used record player? The True Note strobe disc is small enough that you can fold it in half to keep in your wallet or iPhone case - ready to use when you're at a thrift store or garage sale and want to make sure the turntable you're considering buying works properly.

What's New

Version 1.1

Fixes minor layout issue on iPhone X

Ratings and Reviews



I was unable to print off a strobe disc, but I didn’t think that would matter much since I have a nice printed vinyl disc already. However, I was struggling to get my speed set. In the end, my deck was a bit too fast, but reading slow according to the app. I went back to my LED nightlight, and got it dialed in.

What I've been looking for

Lee Berger

When I was a kid I had a strobe disc and a neon test light to measure turntable speed. Both lost over the years. This app fills that need quite well.


James Rhoades
16.9 MB
Requires iOS 10.2 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2017 Crush Apps, Inc.


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    With Family Sharing set up, up to six family members can use this app.

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