Numerical Audio Harmonicer

At a glance

• Editor score
  Not yet scored
• Pricing
  Paid
• Best for
  iPad users building scale-quantized MIDI harmonies
• Free plan
  No
• Maximum harmony voices
  4 voices
• Facts checked
  26 Sep 2026

• Where it wins

  • Quantizes incoming MIDI to more than 20 scales or custom scales
  • Adds up to four harmony voices with individual MIDI channels
  • Combines arpeggiation, progression playback and AUv3 hosting

• Where it doesn't

  • Requires iOS and is not a web app
  • Does not detect key or provide humanisation controls
  • Generates MIDI harmonies rather than vocal harmonies

Our verdict on Numerical Audio Harmonicer

Numerical Audio Harmonicer is an iPad MIDI plugin that combines scale quantization, harmony generation and arpeggiation. It is aimed at musicians working with MIDI who want incoming notes constrained to a chosen scale and expanded into additional parts. More than 20 predefined scales and custom scales are supported, and the harmonizer can add up to four voices. It is a specialized fit for iPad-based composition and performance, rather than a vocal harmony generator or a general-purpose desktop tool.

Its musical workflow links scale control to note generation. The arpeggiator includes rate, mode, octave range, repeats and variation controls, while the built-in keyboard can input MIDI notes and visualize the generated notes. Harmonicer can also record and play back short MIDI progressions. These features give users several ways to develop MIDI material within one tool, though the stated feature set does not include key-scale detection or humanisation controls. It suits users who want explicit scale choices and controllable MIDI output; those seeking automatic key identification or vocal processing should look elsewhere.

Harmonicer runs standalone or as an AUv3 plugin in compatible hosts, including AUM, Cubasis and Logic. It supports individual MIDI channels and voice outputs, with routing options varying by host, so the host environment matters when planning a setup. The product is paid, with no free plan, and support is by email. Choose it if an iPad workflow and AUv3 compatibility match your music setup and scale-quantized MIDI harmonies are the goal. It is a less suitable choice if you need a web app, desktop platform support, or harmony generated from vocals.

Numerical Audio Harmonicer pricing

Numerical Audio Harmonicer fact sheet

Numerical Audio Harmonicer integrations

Numerical Audio Harmonicer lists 4 integrations on its own site.

• AUv3-compatible hosts
• AUM
• Cubasis
• Logic

Alternatives to Numerical Audio Harmonicer

• WHWaves HarmonyFlexible eight-voice harmonies with automatic, MIDI and graphic control for DAW workflows.4.4
• AHAntares Harmony EngineA DAW plugin for shaping four harmony voices with detailed note and performance controls.6.4
• EAEchelon Audio VOICESScale-aware, eight-voice harmony for producers working in major DAWs.6.6

See all Numerical Audio Harmonicer alternatives →

Featured on iTechGuides

Numerical Audio Harmonicer is listed in our AI Harmony Generators directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

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