Comparison

Harmonitron vs KP Viewer

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

Head to head
About

Harmonitron

This app creates a rich, swirling harmonic tremolo effect, distinct from standard volume pulsing. It splits sound into low and high bands, modulating them in opposite phases for a lush, phaser-like character. Apply it to various instruments or full mixes as a standalone app or AUv3 effect.

Highlights
  • True harmonic tremolo with anti-phase modulation
  • Voice control for morphing between classic and harmonic tremolo
  • Split & Tilt for band crossover and balance
  • Tube Drive and tone shaping
  • Adjustable Rate and LFO Shapes
  • Tempo Sync with musical note divisions
  • Stereo Spread for auto-pan and width
Features
Read full description

Harmonitron is a harmonic tremolo. The rich, swirling amp "vibrato" made famous by early-1960s brownface amplifiers. A normal tremolo just pulses your volume up and down. A harmonic tremolo goes deeper: it splits your sound into a low band and a high band, then sweeps them in OPPOSITE phase. As the lows swell, the highs dip and back again. That contrary motion is what gives Harmonitron its lush, watery, almost phaser-like character that an ordinary tremolo can't reach. Turn the Voice control and the effect morphs smoothly from a classic in-phase tremolo all the way to a full harmonic swirl. Drop it on guitars, keys, synths, pads, drums, or a whole mix. Standalone, or as an Audio Unit (AUv3) effect inside GarageBand, AUM, Logic, and other hosts. THE SOUND • True harmonic tremolo: anti-phase modulation of a low and high band • Voice: morph continuously from classic tremolo to full harmonic swirl • Split & Tilt: place the crossover and balance the two bands • Tube Drive and tone shaping for warmth and grit MOVEMENT • Rate from a slow tide to a fast flutter, shown in BPM • LFO Shape: sine, triangle, square, and ramp with adjustable edge Slope • Tempo Sync that locks to your project and lands on the beat, with musical note divisions from 1/1 to 1/32 (dotted and triplet) • Stereo Spread for auto-pan and rotary-style width HANDS-ON • A living hero orb whose two halves breathe in opposite phase — drag it to set Depth, tap to bypass • Grouped, color-coded controls: Motion, Sync, Harmonic, Stereo, Drive, Output • Factory presets: Brownface, Rotary Swirl, Slow Tide, Sync Chop, Wide Harmonic and more — plus your own saved presets PLUGIN & STANDALONE • Full AUv3 audio-effect support with host presets and parameter automation • Runs on iPhone, iPad, and Mac • Standalone mode with a built-in demo pad, live microphone input, or import a song and export the processed result

About

KP Viewer

This app provides a clear, at-a-glance display for Kemper Profiler Player users during live performances. It shows current bank, rig name, effect status, morph status, and an automatic tuner, turning older devices into a dedicated stage display.

Highlights
  • Live performance display
  • Bank and Rig information
  • Rig name display
  • Effect status indicators
  • Automatic tuner
  • Dedicated stage display
Features
Read full description

BEFORE PURCHASING KP Viewer requires a Kemper Profiler Player or Profiler Stage and a direct USB connection. • Lightning iPhone or iPad: USB-B-to-Lightning cable • USB-C iPhone or iPad: USB-B-to-USB-C cable Connect the cable, allow the Kemper to power on completely, then open KP Viewer. The app will not function without a compatible Kemper device and cable. KP Viewer gives Kemper Profiler Player users a clear, easy-to-read display for live performance. Connect your iPhone or iPad to your Kemper Player and KP Viewer provides the information you need at a glance, without navigating through menus. KP Viewer displays: • Current Bank and Rig • Rig Name • Effect status for A, B, C, D, X, MOD, DLY, and REV • Morph status • Automatic tuner display The interface is designed to be simple, highly visible, and useful on stage, making an older iPhone or iPad a practical dedicated display for your Kemper Player. KP Viewer is an independent application and is not affiliated with or endorsed by Kemper GmbH.

Screenshots

Harmonitron2 screens
KP Viewer1 screens

Verdict

The call

The clearest difference is price: Harmonitron at $2.99 against KP Viewer's $19.99. KP Viewer's advantage is iOS requirement (15.0 vs 17.0). On rating, ratings volume, ads and in-app purchases 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

Harmonitron costs $2.99 and KP Viewer $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Harmonitron against 5.0 for KP Viewer. Both are backed by a comparable volume of ratings — 2 and 3 respectively.

Scorecard2 real differences · 8 level
Harmonitron versus KP Viewer: the parameters behind the verdict, then further details
ParameterHarmonitronKP Viewer
Price$2.99 — better$19.99
Rating5.0 (2 ratings)5.0 (3 ratings)
Positive reviews—100.0% of reviews
Number of ratings23 — better
Update frequency—Every 4 days
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.0 — better
Further details — not scored
Size3 MB3 MB
Age rating4+4+
DeveloperKonstantin Torsten SchutzDEREK BERNARD

Customer experience

Harmonitron

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

KP Viewer

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Harmonitron

No in-app purchases

None

KP Viewer

No in-app purchases

Questions

Is Harmonitron free?
Harmonitron costs $2.99, with no in-app purchases.
Is KP Viewer free?
KP Viewer costs $19.99, with no in-app purchases.
Which has better reviews, Harmonitron or KP Viewer?
Harmonitron and KP Viewer are both rated 5.0 out of 5 on the App Store, from 2 and 3 ratings respectively.
Do Harmonitron or KP Viewer have ads?
Neither Harmonitron nor KP Viewer shows ads.

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