Hokusai is a multitrack audio editor for iPhone, iPad or iPod touch. Record or import a track, and make it sound the way you want it to: not just trimming the ends, but full cut, copy, paste and delete, and a suite of filters and special effects available.

"Beautiful clutter-free interface" —

"Hokusai will convince you that audio was meant to be edited with a touch screen — it's just so natural within this app that you’ll find yourself consistently coming back to it." — iOS Music And You

Edit many tracks side-by-side, mix them together, and export to Wave or MP4 format — then transfer them to your computer, send them to another app on your device, or upload to cloud services.

Hokusai is streamlined to give you a clean, clear view of your tracks. Use the familiar pinch and swipe gestures to zoom right in and fiddle with fine detail, or step back to see the big picture. Select pieces of audio. Live "scrubbing" means you can hear the sound under your fingertip as you make your adjustments. And you needn't fear a bad edit with our full undo/redo support — even after closing your project.

Hokusai comes free with a set of useful tools such as fade in/out, normalise volume levels, reverse time, and basic synthesis. If you need more power, you can upgrade from inside the app to add new tools and effects, including: Per-track volume/mute/panning, selecting across multiple tracks at once, presets and favourites, grain synthesis, noise gating, time-stretching, pitch-bending, echo, reverb, modulation (AM & FM), resonance, distortion, grunge, vocal levelling, monster voice, high/low/band-pass/notch-cut filter and more — many of which can be previewed live.

What's New

Version 2.2.4

This update addresses some issues related to selection scrubbing and pasting audio into a new track.

In version 2.2:

New for paying customers:

• New: Play back previews of projects at different speeds
• New: Input gain control during recording (for devices which support it)
• New: Import/export effects presets (for making backups & sharing presets with others)
• New: Export Selection command now has choice of .wav or .m4a formats
• New: Commands and keyboard shortcuts to adjust the selection range to sound or silence.
• New: When changing a project’s BPM, Hokusai offers to resample or time stretch the project to the new tempo
• New: Click Track can match its BPM to the project’s

New for all users:

• New: Warns when your device is low on storage space
• New: Option to scroll the screen automatically to follow your finger when you drag the selection near the edge of the screen
• New: Option to scroll the screen automatically during playback to follow the Play Head
• New: Keyboard shortcut to jump to Play Head
• New: Sort projects by name or size (as well as the original, sort by date)
• Accessibility: “Magic Tap” gesture to play/pause audio playback
• Improved some visual elements, including alerts and menus
• Various other small fixes and improvements

Ratings and Reviews

3.9 out of 5

75 Ratings

75 Ratings

This is truly a great app!


First time writing an App review.
I tried many free apps for audio editing, but nearly all were trying to push adverts or were just not upto the mark! Too many hidden problems!
This app by Hokusai is a real gem! It does almost everything you might want on the free app, without buying the pro version. I could do trimming, duplicating, pasting, adding tracks together, zooming to see detail in the wave pattern, exporting the finished project as an .mp4 file but still easily playable (after importing individual tracks as mp3). Easy to bring in tracks via WiFi sharing. All of this I could do within a few mins of trial and error practicing. So easy to learn without reading a manual😀👍
Thank you developer for a genuinely great app.
Never asked me to upgrade or buy anything after a full day’s use.
So far, really so good!!

Amazing app, amazing service


Wooji Juice has made the best possible impression on me. Both for the ease of use of apps, the quality and functionality of said apps, but also a consistently friendly and immediate response to questions/concerns. Did I mention I’m 100% blind, and I’m still able to make use of this and Ferrite? Even Apple’s native DAWs and voice recorders aren’t this user friendly. Wooji Juice, thank you so much. Suggesting this to all my musician friends, whether sighted or blind.

Great app that still receives updates to this day


It's great that this supports exporting to so many apps. I use this with Nanostudio to make samples of songs for my music all the time. The only problem is that there's no way to speed up and slow down tracks, which is essential for what I'm using it for. The default effects are very limited and the ability to change tempo without changing pitch seems like a must-have for any audio editor. This is still overall a good stripped-down app.

Developer Response

Hello! You can speed up or slow down a track in Hokusai: first select the audio you want to change the speed of. Pick "More..." from the selection menu, then pick "Time Stretch" from the list of effects. You'll find a "Keep Pitch Constant" switch in the Time Stretch settings as well, to change tempo without changing pitch. Note: Time Stretch is part of the Pro Upgrade. If you're using the free version of Hokusai, you can preview it, and many other effects, by tapping the Upgrade panel at the bottom of the project library and then selecting "Preview the Upgrade". While it would be great if we could give everyone every feature for free, app developers also need to eat — when folks pay for the Pro features, it makes this (eating!) possible, as well as making possible the continued updates. Have a great weekend!


Wooji Juice Ltd
34.8 MB
Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2011-2018 Wooji Juice
In-App Purchases
  1. Hokusai 2 Pro Pack $9.99
  2. Hokusai 1 Pro Pack $9.99
  3. Hokusai 2 Pro Pack (Upgrade) $4.99


  • Family Sharing

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

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