Comparison

Koala Sampler vs Vetro

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

Head to head
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
Read full description

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

About

Vetro

This app provides a visual metronome with dynamic beat synchronization via Ableton Link. It supports custom animations and works across multiple devices, enhancing practice and recording sessions.

Highlights
  • Visual metronome
  • Ableton Link synchronization
  • Custom GIF and Lottie animations
  • Multiple visualization modes
  • Cross-device support (iPhone, iPad, macOS)
  • Adjustable time signatures
Read full description

Vetro is a visual metronome that can synchronize automatically to a shared tempo on the network using Ableton Link protocol. Different visualization modes are included. Customize it by importing any animated GIF or Lottie animation (just drag and drop) and it will play in sync to your music. Use it in any of your devices (iPhone, iPad and macOS supported). On macOS, it can be freely resized to any window size and kept visible at all times so you are always aware of the current tempo. Blend it with your favorite apps by adjusting window opacity, and even allow mouse events to pass through so you can keep it visible while controlling the apps underneath. Use it as a visual enhancement for your recording sessions or as a new kind of metronome when practicing. Many devices can be used at the same time and they will all sync together. This may be cool when jamming! ## Features * 11 visual modes included. * 7 metronome sounds included. * Accurate timing. * Ableton Link synchronization. * Set any time signature. * Play animated GIF and Lottie animations in sync. * iPhone, iPad and macOS support. ## macOS-only features * Always visible option. * Translucent window: Adjust background and content opacity independently. * Pass-through mouse events. Keep Vetro on top of other apps without interrupting your workflow. * Automatically show/hide Vetro window when receiving Link Start/Stop commands.

Screenshots

Koala Sampler4 screens
Vetro4 screens

Verdict

The call

The clearest difference is review sentiment: Koala Sampler at 88% against Vetro's 40%. Koala Sampler also leads on rating (4.8 vs 4.0) and ratings volume (1.5K vs 2). Vetro's advantage is price (Free vs $4.99) and in-app purchases (none vs 8). On ads and device support 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

Vetro is free to download; Koala Sampler costs $4.99 up front. Koala Sampler sells 8 one-off in-app purchases. Vetro asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Koala Sampler holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: Koala Sampler has 1.5K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 88% of Koala Sampler's written reviews are positive against 40% of Vetro's.

UpkeepUpdate frequency

Koala Sampler ships an update fortnightly, Vetro every 2 months. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

Scorecard9 real differences · 2 level
Koala Sampler versus Vetro: the parameters behind the verdict, then further details
ParameterKoala SamplerVetro
Price$4.99Free — better
Rating4.8 (1.5K ratings) — better4.0 (2 ratings)
Positive reviews88.3% of reviews — better40.0% of reviews
Number of ratings1.5K — better2
Update frequencyFortnightly — betterEvery 2 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
Best chart rank#9 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS15.0 — better17.6
Further details — not scored
Size60 MB6 MB
Age rating4+4+
DeveloperMazbox LimitedJoan Duat

Customer experience

Koala Sampler

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

Vetro

All ratings2 ratings
Positive50.0%
Neutral50.0%
Negative0.0%
Written reviews5 reviews
Positive40.0%
Neutral20.0%
Negative40.0%

Bugs and requests

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

Vetro

Not enough reviews yet to summarise bugs or requests.

In-app purchases

8 purchases

Koala Sampler

One-time8
  • Koala AUv3 Plugin$1.99
  • Ese-O's Sample Pack$2.99
  • Solar Studies Samplepack$2.99
Show 5 more
  • Soon Come Dub Sample Pack$2.99
  • Analog Astronaut Samplepack$2.99
  • Cirrus Cuts Sample Pack$2.99
  • Samurai Edition$3.99
  • Mixer$4.99
None

Vetro

No in-app purchases

Questions

Is Koala Sampler free?
Koala Sampler costs $4.99, and also offers in-app purchases.
Is Vetro free?
Vetro is free to download, with no in-app purchases.
Which has better reviews, Koala Sampler or Vetro?
Koala Sampler is rated higher. Koala Sampler averages 4.8 out of 5 from 1.5K ratings, while Vetro averages 4.0 from 2 ratings.
Do Koala Sampler or Vetro have ads?
Neither Koala Sampler nor Vetro shows ads.
Which is updated more often, Koala Sampler or Vetro?
Koala Sampler ships an update fortnightly, and Vetro every 2 months. Most recently, Koala Sampler was updated on October 29, 2026 and Vetro on October 24, 2026.

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