Comparison

Harmonitron vs Bass 3500 Amplifier

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

Bass 3500 Amplifier

Features
Read full description

"The unmistakable punch, definition, and flexibility of a legendary hybrid bass amplifier" Modeled after the legendary Hartke HA3500* bass amplifier Nembrini Audio Bass 3500 captures the powerful low end, fast transient response, and distinctive hybrid preamplifier design of the original amplifier. Key Features - Hybrid Preamp: Independently blend Tube and Solid State stages to combine harmonic warmth, clarity, definition, and punch. - Built-In Compressor: Controls peaks, evens out dynamics, and adds weight and consistency to the bass signal. The activity LED provides visual feedback for compression and limiting. - Ten-Band Graphic Equalizer: Provides ±15 dB adjustment at 30 Hz, 64 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 3 kHz, 5 kHz, and 8 kHz. - Contour Controls: Broad Low Pass and High Pass controls shape the low-frequency region around 100 Hz and the upper-frequency region around 10 kHz. - Pre-Amplifier Stomp Effects: Noise Gate, Envelope Filter, Octaver, and Modern Tubes Drive. Every pedal is draggable and reorderable for complete signal-chain customization. - Cabinet and Recording Chain: Four bass cabinet emulations, four microphone models, adjustable microphone positioning, tweeter controls, parallel D.I. processing, and three ambience environments. - Dual Impulse Loader: Load and blend up to two third-party impulse responses with level, pan, phase, Solo, and Mute controls. - Six-Band Parametric Equalizer: Detailed post-amplifier tone shaping with multiple filter types, adjustable frequency, gain, and Q. - Post-Amplifier Effects: Studio Compressor, bass-optimized Modulation, and Analog Delay. Every effect is draggable for flexible routing. - Cabinet Bypass: Bypasses the complete cabinet, recording chain, and impulse-loader section for use with external cabinet processors, IR loaders, or a real power amplifier and bass speaker system. PEDALS Four bass-focused stomp effects: Noise Gate, Envelope Filter, Octaver, and Modern Tubes Drive everything from clean control to synth-style lows and warm saturation. Each effect can be dragged to customize the signal order. CABINETS Choose from four bass cabinets and four microphone models, with adjustable mic placement and tweeter controls. Blend the cabinet signal with a processed D.I. channel and three ambience environments. IR LOADER Load and blend up to two third-party impulse responses. Each slot includes level, pan, phase, Solo, and Mute controls. EQUALIZER A six-band parametric equalizer provides precise post-amplifier tone shaping, with multiple filter types and adjustable Frequency, Gain, and Q. POST EFFECT Studio Compressor, bass-optimized Modulation, and Analog Delay complete the signal chain. Each effect is draggable for flexible routing Legal Disclaimer: Hartke HA3500 is a registered trademark of Samson Technologies Corp. NA Bass 3500 was developed by Nembrini Audio SRL based on its modeling techniques. Samson Technologies Corp. has not endorsed nor sponsored the NA Bass 3500 in any manner, nor licensed any intellectual property for use in this product.

Screenshots

Harmonitron2 screens
Bass 3500 Amplifier4 screens

Verdict

The call

The clearest difference is price: Harmonitron at $2.99 against Bass 3500 Amplifier's $19.99. Bass 3500 Amplifier's advantage is iOS requirement (12.0 vs 17.0). On ads, in-app purchases 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

Harmonitron costs $2.99 and Bass 3500 Amplifier $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Scorecard2 real differences · 6 level
Harmonitron versus Bass 3500 Amplifier: the parameters behind the verdict, then further details
ParameterHarmonitronBass 3500 Amplifier
Price$2.99 — better$19.99
Rating5.0 (2 ratings) — better—
Number of ratings2 — better—
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.012.0 — better
Further details — not scored
Size3 MB58 MB
Age rating4+4+
DeveloperKonstantin Torsten SchutzNembrini Audio

In-app purchases

None

Harmonitron

No in-app purchases

None

Bass 3500 Amplifier

No in-app purchases

Questions

Is Harmonitron free?
Harmonitron costs $2.99, with no in-app purchases.
Is Bass 3500 Amplifier free?
Bass 3500 Amplifier costs $19.99, with no in-app purchases.
Do Harmonitron or Bass 3500 Amplifier have ads?
Neither Harmonitron nor Bass 3500 Amplifier shows ads.

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