KDJ vs jAmpler
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
KDJ
Create music on your smartphone with a portable audio workstation. Compose original songs or mix existing tracks using over 400 instruments and 200 preset samples. Ideal for beginners and on-the-go musicians.
- Compose music in 5 minutes
- Over 200 preset tracks
- Over 400 instruments
- Sequencer, Synthesizer, Sampler modes
- Song Mode for arrangement
- Personal DJ machine functionality
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Introducing the smartphone app of the world’s first portable audio workstation, the “KDJ-ONE”! Compose a song in just 5 minutes on your smartphone device! Compose your own music, or mix existing tracks and use it as your own personal “DJ Machine”. Utilize your imagination and ideas to create your own music as if you were in a professional studio. Boasting a selection of more than 200 preset tracks and over 400 instruments to choose from, you can compose your own music without a musical background. Create a short melody in 5 minutes, or use the mute function and song mode to mix and easily play music like a DJ. ◆Recommended For:◆ Beginners looking to create their own music! People who want to create music on the go! On tour, vacation… and more! People creating music for games and performances! People who want to experience the hardware version of the KDJ-ONE! ◆Functions: Preset Samples: Over 200 tracks! Preset Instruments & Sounds: Over 400 varieties! Modes: Sequencer (Insert different instruments and sounds into your composition) Synthesizer (Synthesize waveforms to form a timbre) Sampler (Record and modify sounds from external audio inputs) Song Mode (Arrange and playback your composition) ◆Languages: Japanese, English ◆Compatibility iOS 10.0 or later ◆URL KDJ-ONE Official Site: http://www.kdj-one.com This app is based on the hardware version of the “KDJ-ONE” and may differ with regards to development and functions.
jAmpler
Record, import, and manipulate audio samples with a versatile instrument plugin. Create unique sounds using granular synthesis and a wide array of effects. Assign samples to a keyboard for intuitive musical performance.
- Record and import audio samples
- Assign samples to keyboard keys
- Granular synthesis controls
- Extensive per-sample editing
- Global effects suite
- Adjustable velocity curve and temperament
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jAmpler is a sample-based instrument plugin for iOS and macOS, designed as an Audio Unit v3 (AUv3) instrument. It enables you to record, import, assign, and manipulate samples with a rich set of controls and global effects — all accessible in a compact, intuitive interface. Features: * 4 banks, each with 8 samples. * Each sample is represented by a unique color. * Record samples directly using your device’s built-in microphone. * Import audio files to use as samples. * Assign samples to keyboard keys using their color codes. * Detailed controls per sample: - Copy, paste, and trim samples. - ADSR envelope (Attack, Decay, Sustain, Release). - Crossfade and crossfade overlap for seamless looping. - Octave shifting and drive/distortion. - Filter and pitch shift options. - Granular synthesis controls (wet, density, size, spray, stereo spread, window shape). * Global effects: - Velocity Controlled Filter. - Low Frequency Oscillator. - Compressor. - Distortion. - Equalizer. - Chorus. - Cabinet. - Reverb. * Adjustable velocity curve and keyboard temperament.
Screenshots
Verdict
The clearest difference is rating: KDJ at 4.8 against jAmpler's 4.2. KDJ also leads on in-app purchases (none vs 1) and iOS requirement (10.0 vs 14.0). On price, review sentiment, ratings volume and update cadence 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
Both are free to download. jAmpler sells 1 one-off in-app purchase. KDJ asks for nothing beyond the download.
KDJ holds the better App Store score, 4.8 against 4.2. Both are backed by a comparable volume of ratings — 17 and 6 respectively. Written reviews point the same way: 67% of KDJ's written reviews are positive against 60% of jAmpler's.
Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 4, 2026 and October 11, 2026 respectively.
| Parameter | KDJ | jAmpler |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (17 ratings) — better | 4.2 (6 ratings) |
| Positive reviews | 66.7% of reviews — better | 60.0% of reviews |
| Number of ratings | 17 — better | 6 |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 10.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 82 MB | 1.4 GB |
| Age rating | 4+ | 4+ |
| Developer | CyberStep, Inc. | Jan Maes |
Customer experience
KDJ
jAmpler
In-app purchases
KDJ
No in-app purchases
jAmpler
- jAmpler Activation$7.99









