Comparison

AUM vs Koala Sampler

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

AUM

This app is a versatile audio mixer, recorder, and connection hub for mobile devices. It allows users to connect various audio sources, route signals, apply effects, and record mixes with high fidelity. It supports advanced features like MIDI control, synchronization, and integration with other audio apps and hardware.

Highlights
  • Connect hardware inputs/outputs
  • Route audio and MIDI
  • Host Audio Unit extensions
  • Record mixes and individual tracks
  • Synchronize with Ableton Link
  • Built-in processing nodes
  • MIDI control and routing
Features
Read full description

AUM is the flexible audio mixer, recorder, and connection hub for your iPad, iPhone and iPod touch. Connect hardware inputs and outputs, Audio Unit extensions, Inter-App Audio apps, Audiobus, soundfile players, built-in signal processing and filters, in any configuration you want. Route anything to anywhere with mix-busses, effect sends, audiobus ports, and external multi-channel audio interfaces. Play hosted synths and instruments using the built-in keyboard or external MIDI controllers, or sequence them with AU MIDI plugins or from other apps using Virtual MIDI. Record mixes, individual tracks, or both, straight into the storage space of AudioShare (no copying of files needed), with synchronized start and end for perfect loops. Play back recordings, soundfiles and loops as channel sources in the mixer for backing tracks, further processing or mixing. Soundfiles can be opened from anywhere, including USB drives on iOS 13 and later. Route and filter MIDI in any way you like using the MIDI matrix. Combine and filter MIDI endpoints using MIDI buses. Synchronize everything with the transport clock and play in time with other apps or devices using Ableton Link. Connect external music machines and synchronize them with MIDI Clock. Includes built-in processing nodes for various stereo processing, Mid/Side balance and conversion, EQs and filters, limiting, clipping and saturation. Or use any 3rd party Audio Unit extension or Inter-App Audio effect. All controls in the mixer can be controlled via MIDI, including parameters of hosted and built-in plugins. "A brilliant idea that has been brilliantly executed. Top-notch technical stuff and highly recommended" - MusicAppBlog "Feature rich, powerful, intuitive, and simple to use" - DubSpot "Executes live mixing with surprising ease, with a load of extensive features under the hood, quick snappy response on the screen and audio" - AudioNewsRoom FEATURES • High quality audio up to 32-bit 192kHz • Clean and intuitive user interface with crisp vector graphics • Unlimited number of channels • Unlimited number of effect slots • Inserts and sends are configurable pre/post-fader • Internal busses for mixing, effect sends, signal splitting • Supports multi-channel audio interfaces for both inputs and outputs • Supports built-in speaker and mic, including stereo mic on devices that has it. • Supports Audio Unit extensions, Inter-App Audio and Audiobus • Route MIDI output from Audio Unit extensions • Supports Audio Unit multiple output and input busses (for side-chaining etc) • Highly accurate transport clock • Metronome with selectable output and optional pre-roll • Sends host sync to Audio Unit plugins and IAA apps • Play in time with Ableton Link, with Start/Stop support • Slave external hardware via MIDI Clock • FilePlayer with sync and looping with access to all your soundfiles • Records straight into AudioShare storage space • Record synchronized beat-perfect loops • Built-in nodes for stereo processing, filtering and dynamics • Latency compensation makes everything align at the outputs • Optional manual compensation using TimeOffset • Multiple Inter-App Audio / Audiobus output ports • Audiobus state saving • Built-in MIDI keyboard • Fully MIDI controllable • MIDI Matrix for routing MIDI anywhere • MIDI filtering for any MIDI destination • Combine MIDI sources or destinations using MIDI buses BUILT-IN SIGNAL PROCESSING • Stereo balance • Stereo to mono • Stereo panning • Mid/Side balance • Mid/Side - Stereo convert • Invert Phase • Parametric EQ • Low-shelf filter • High-shelf filter • Low-pass resonant filter • High-pass resonant filter • LP/HP combo filter • First order All-pass filter • Second order All-pass filter • Gain • Hard clip • Saturation • Lookahead peak limiter • System-provided Apple Audio Units

About

Koala Sampler

This app allows you to record sounds with your phone's microphone, transform them with effects, and create beats and tracks. Its intuitive interface focuses on a fast and fun music-making process.

Highlights
  • Record up to 64 samples with mic
  • Apply 16 built-in effects
  • Load and use own samples
  • Create beats with high-resolution sequencer
  • Export loops and tracks as WAV
  • AI sample separation
  • AUv3 and MIDI compatibility
Features
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Koala is the ultimate pocket-sized sampler. Record anything with your phone's mic or load your own sounds. Use Koala to create beats with those samples, add effects and create a track! Koala's super intuitive interface helps you make a track in a flash - there is no brake pedal. You can also resample the output of the app back into the input, through the effects, so the sonic possibilities are endless. Koala's design focuses totally on making the music-making process instant, keeping you in the flow and keeping it fun, not getting bogged down by pages of parameters and micro-editing. "Been putting that $4 koala sampler to good use lately. Undeniably great tool that puts some of these expensive beat boxes to shame. A must cop." -- flying lotus, twitter * Record up to 64 different samples with your mic * Transform your voice or any other sound with 16 superb built-in fx * Load your own samples * Choose from one of 250 built-in sounds * Resample the output of the app back into a new sample * Export loops or entire tracks as professional quality WAV files * Direct export to Ableton Live Set * Copy/paste or merge sequences just by dragging them * Create beats with the high-resolution sequencer * Import samples from the Files app or even from videos * Keyboard mode lets you play chromatically or one of 9 scales * Quantize, add swing to get the right feel * Normal/One-shot/Loop/Reverse playback of samples * 6 Choke groups * Attack, release and tone adjustable on each sample * Mute/Solo controls and note repeat * Add any (or all) of the 16 effects to the entire mix * AUv3 compatible - use in GarageBand, Logic, Cubasis etc etc * MIDI controllable - play your samples on a keyboard, map the effects to knobs * Jam with others over WiFi with Ableton Link * Free copy of Ableton Live Lite included * AudioShare compatible * Use AI to separate samples into individual instruments (drums, bass, vocals and other) * Set your own background image and choose from a growing list of background visual FX 8 Built-in Microphone FX: * More Bass * More Treble * Fuzz * Robot * Reverb * Octave up * Octave down * Synthesizer 16 Built-in DJ Mix FX: * Bit-crusher * Pitch-shift * Comb filter * Ring modulator * Reverb * Stutter * Gate * Resonant High/Low Pass Filters * Cutter * Reverse * Dub * Tempo Delay * Talkbox * VibroFlange * Dirty * Compressor Features included in SAMURAI In-App Purchase * Pro-quality Timestretch (5 modes: Modern, Retro, Beats, Re-pitch and Cyclic) * Piano roll editor * Auto-chop (auto, equal, and lazy chop) * 3 Band EQ * Pocket operator sync out * Quokka Synth - powerhouse polyphonic synthesizer * MIDI Out - control external MIDI hardware with Koala's sequencer * Chopper - multimodal sample chopping instrument Features included in MIXER In-App Purchase * Mix your beats professionally with a 4 channel mixer + main bus * Route any sample to any channel * Mute/solo, faders and accurate metering on every channel * 5 effect slots per channel * 29 high-quality effects - compressors, filters, phasers and more, with new effects to come * Host AUv3 plugins - both audio effects and instruments

Screenshots

AUM4 screens
Koala Sampler4 screens

Verdict

The call

The clearest difference is price: Koala Sampler at $4.99 against AUM's $24.99. Koala Sampler also leads on update cadence (fortnightly vs every 3 months) and chart position (#8 vs unranked). AUM's advantage is iOS requirement (12.0 vs 15.0). On rating, review sentiment, ratings volume and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

AUM costs $24.99 and Koala Sampler $4.99 up front. AUM sells 4 one-off in-app purchases and Koala Sampler sells 7 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for AUM against 4.8 for Koala Sampler. Both are backed by a comparable volume of ratings — 535 and 1.5K respectively. Written reviews are what separate them: 82% of AUM's written reviews are positive against 88% of Koala Sampler's.

UpkeepUpdate frequency

AUM ships an update every 3 months, Koala Sampler fortnightly. Both last shipped on November 2, 2026.

Scorecard4 real differences · 7 level
AUM versus Koala Sampler: the parameters behind the verdict, then further details
ParameterAUMKoala Sampler
Price$24.99$4.99 — better
Rating4.7 (535 ratings)4.8 (1.5K ratings) — better
Positive reviews81.9% of reviews88.3% of reviews — better
Number of ratings5351.5K — better
Update frequencyEvery 3 monthsFortnightly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank—#8 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.0
Further details — not scored
Size13 MB60 MB
Age rating4+4+
DeveloperKymatica ABMazbox Limited

Customer experience

AUM

All ratings524 ratings
Positive93.3%
Neutral1.5%
Negative5.2%
Written reviews315 reviews
Positive81.9%
Neutral5.7%
Negative12.4%

Koala Sampler

All ratings1,438 ratings
Positive93.8%
Neutral2.0%
Negative4.2%
Written reviews618 reviews
Positive88.3%
Neutral4.2%
Negative7.4%

User reviews

AUM

From 535 App Store ratings

What we love

  • 👍 Excellent audio routing and mixing capabilities
  • 🚀 Powerful and flexible workflow
  • 💡 Seamless integration with AUv3 and IAA apps
  • 👍 Intuitive and clean user interface
  • 👍 Reliable and stable performance

Room to improve

  • 🐛 Occasional crashes or stability issues
  • 💡 Lack of MIDI clock sync receive functionality
  • 💡 Limited visual customization options (e.g. channel sizes)
  • 🐛 Compatibility issues with some hardware interfaces

Koala Sampler

From 1.5K App Store ratings

What we love

  • 👍 Intuitive and easy to use
  • 🚀 Smooth workflow and fast performance
  • 💡 Powerful sampling and sequencing capabilities
  • 🔥 Excellent value for the price
  • 🎨 Creative and inspiring sound design

Room to improve

  • 🐛 Occasional crashes and stability issues
  • 🔇 Limited effects and sound manipulation options
  • 📁 Difficulty managing and organizing samples/projects
  • 🎚️ Lack of advanced MIDI mapping and control options
  • 🔍 Unclear or confusing UI elements in certain areas

Bugs and requests

AUM

Reported bugs

3 issues
  • Crashes or freezes when using certain plugin combinations
  • Compatibility issues with iOS 15 and newer
  • Inconsistent MIDI transport controls

Requested features

4 requests
  • Add MIDI clock sync receive capability
  • Implement a timeline/sequencer view
  • Provide more visual customization options
  • Improve support for external hardware integration

Koala Sampler

Reported bugs

3 issues
  • Samples not loading or disappearing after app updates
  • Sequencer timing and quantization issues
  • Crashes when using certain features or with large projects

Requested features

5 requests
  • Ability to record and edit MIDI sequences
  • More comprehensive effects and sound processing tools
  • Improved sample management and organization features
  • Support for external MIDI controllers and hardware integration
  • Customizable color schemes and UI themes

In-app purchases

4 purchases

AUM

One-time4
  • Small Tip$0.99
  • Medium Tip$1.99
  • Large Tip$4.99
Show 1 more
  • Huge Tip$9.99
7 purchases

Koala Sampler

One-time7
  • Ese-O's Sample Pack$2.99
  • Solar Studies Samplepack$2.99
  • Soon Come Dub Sample Pack$2.99
Show 4 more
  • Analog Astronaut Samplepack$2.99
  • Cirrus Cuts Sample Pack$2.99
  • Samurai Edition$3.99
  • Mixer$4.99

Questions

Is AUM free?
AUM costs $24.99, and also offers in-app purchases.
Is Koala Sampler free?
Koala Sampler costs $4.99, and also offers in-app purchases.
Which has better reviews, AUM or Koala Sampler?
Koala Sampler is rated higher. AUM averages 4.7 out of 5 from 535 ratings, while Koala Sampler averages 4.8 from 1.5K ratings.
Do AUM or Koala Sampler have ads?
Neither AUM nor Koala Sampler shows ads.
Which is updated more often, AUM or Koala Sampler?
AUM ships an update every 3 months, and Koala Sampler fortnightly. Most recently, AUM was updated on November 2, 2026 and Koala Sampler on November 2, 2026.

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