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Beat Twirl

By Guy Shaviv

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Beat Twirl is a "beat slicer" app. The app lets you analyze existing sounds and detect their rhythm with its note onset algorithms. With Beat Twirl you can work with drum loops and rhythm patterns, easily enhancing them with additional percussion sound, or create new patterns.

"...a seriously handy tool for the ios musician." -
"you can have a ball, and make some interesting things" -

Beat Twirl was chosen as one of the best iOS Audio Apps by iDesignSound (

With Beat Twirl you can:

• Change the tempo (time) of drum loops without changing the pitch.
• Analyze percussion patterns and find the underlying timing.
• Mix-in additional percussion sounds, or replace the original sounds
• Export single beats from a sound file.

How to use Beat Twirl?

• You can record yourself singing or clapping a rhythm, than add percussion instruments to the rhythm you created.
• You can extract a rhythmic/percussive section from a song and convert it to a loop you can play along with at different tempos.
• Mix-in percussion instruments to a song to enhance its' rhythm.
• Extract beat samples from a song for use with a beat sequencer.

• Import audio from your ipod library, using iTunes file sharing or using audio copy/paste from supporting applications.
• Record using an external mic or the built in mic.
• Universal app. UI designed iPhone, iPod touch and iPad. Supports retina displays.
• Two spectrum based note onset detection algorithms.
• Manual slicing capabilities on top of the automated algorithm.
• Mix in percussion beats from a library of 300 samples.
• Export audio as wav, caf or aac. Export using audio copy, iTunes files sharing or email.
• Audiobus input/output support.

What's New in Version 3.1.2

Fix import function on iPhone.


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Customer Reviews

No Good.

I was very excited when I heard about this app. Unfortunately it doesn't work as advertised. It doesn't work efficiently at all and doesn't transfer data between apps as advertised. As is it is basically useless, especially when it's crashing all the time. Waste of $10.

One of a kind, stable, well worth it

Continues to be an incredible tool.

Still worth it despite quirks. My work arounds:

As far as a standalone iDevice version of ReCycle (and I've used ReCycle on my desktop since 2001)...Beat Twirl is THE only game in town.

First off understand its purpose and flow, which mirror ReCycle exactly (with the exception of BT not supporting .rx2 file export!) :

1.) Slicing audio files into little snippets--which you can then export singly or altogether--to use as samples. Straightforward, useful, though common enough.

2.) The super-powers come from within the app itself after you've added the slice points. These markers act as "event triggers" which mean that as you change the BPM of the loop, you're not speeding or slowing the actual audio; you're lengthening or shortening the time between when the starting points of those event triggers get played.

(It'd take too long to explain all the nuances here, but suffice it to say: you're generally going to get better--i.e. more natural--results when applying more extreme BPM variation by speeding up. This is because when BT adds a decay tail, that end part *does* involve actual audio stretching. Faster=The app removes samples from the loop ends to fit the length; slower=the app adds samples to the loop end to create a more natural decay. While Beat Twirl does stretch the decay, it's generally poor quality--and not long enough. ReCycle smokes BT in this department, but hey, I paid $150 for ReCycle when I got it.)

3.) That being said, you do have the option of re-pitching a whole lot more. Plenty of info on that elsewhere.

In sum: BT is NOT, on its own, some kind of stutter effect. It's a Swiss Army knife do slicing that's an intermediate step between sample creation and some other sample playing application, DAW, sequencer, or what have you.


The reviews are bewilderingly skewed to the negative, even considering what I just said about BT being the only standalone iOS app that "ReCycles". Is BT slightly touchy, funky, and a bit unstable? Yes. But it *does* get the job done. I've encountered the bugs that some reviewers have mentioned, and I'm going to tell you how to work around them:

1.) Some crash bugs I can't reproduce or figure out. No matter: by momentarily putting BT in the background (double home-buttoning), then bringing it right back up, it "saves" your current state. After a crash, the last background state is recalled.

2.) This one was happening to me ALL the time and nearly drove me crazy: when you're using the "Position" wheel to set your slice start marker, you MUST have a slice highlighted. Sometimes the slice gets deselected, you move the Position wheel--then guaranteed crash.

3.) I gave up on Audio Copy in BT a long time ago. My airtight workaround: "Open In"...and do it in AudioShare; WAVs for audio loops, ZIPS for series of slices. (If you don't have AudioShare yet...get it. Just do it.)

4. Very short, very quiet slices export as blank snippets. I have a workaround, but it's just arcane!


There are a number of things that could be improved. One is a constant annoyance: BT's auto-slice detect always errs towards slicing too early. This means you're constantly fine-tuning the cut with the slice position wheel. But as that wheel is set up, you have to drag it left to make the slice bar go right. This means (for righties) that your hand is always blocking the screen. ($10 bux says the Dev is a lefty! 😜)

Also: I *sorely* miss the original interface/look-and-feel. (iOS 7 look & feel= boo! 👎😡). Lord, that original UI was funkass-groovy.

Hope this helps you.

Nick Rusko-Berger

Beat Twirl
View in iTunes
This app is designed for both iPhone and iPad
  • $9.99
  • Category: Music
  • Updated:
  • Version: 3.1.2
  • Size: 29.1 MB
  • Languages: English, French
  • Seller:

Compatibility: Requires iOS 5.0 or later. Compatible with iPhone, iPad, and iPod touch.

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