Comparison

Harmonicer vs Prism MIDI Sequencer

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

Head to head
About

Harmonicer

This app generates musical inspiration by combining MIDI quantization, harmonization, and arpeggiation. It offers extensive scale support and allows for the creation of complex chords and rhythmic patterns to enhance musical compositions.

Highlights
  • MIDI Quantizer with 20+ scales
  • Custom scale support
  • Harmonizer with up to 4 voices
  • Arpeggiator with 10 modes
  • Process MIDI from any source
  • Standalone use with internal keyboard
Features
Read full description

Instant Inspiration at Your Fingertips Harmonicer combines MIDI Quantizer, Harmonizer and Arpeggiator into one convenient package. At the core of Harmonicer lies its Quantizer feature with over 20 pre defined scales and support for custom scales. Whether you're a seasoned composer or a novice musician, Harmonicer empowers you to effortlessly create melodies that are harmonically rich and sonically captivating. Unlock Limitless Harmonic Possibilities Harmonicer's Harmonizer functionality takes your compositions to new heights by automatically generating lush chords and harmonies. With up to 4 additional voices and intuitive controls, you can explore a vast array of harmonic possibilities and infuse your music with depth and emotion. Unleash Your Creativity with Dynamic Arpeggiation With Harmonicer's Arpeggiator, intricate rhythmic patterns and melodic sequences are just a few taps away. Whether you're crafting pulsating basslines, mesmerizing synth leads, or intricate melodies, the Arpeggiator empowers you to infuse your tracks with movement and energy, adding a dynamic edge to your music. Combining Power and Versatility What sets Harmonicer apart is its seamless integration of these three powerful tools, allowing users to utilize them individually or in combination to achieve complex compositions with ease. Whether you're looking to fine-tune a melody, enrich your harmonies, or add rhythmic complexity, Harmonicer provides the tools you need to inspire your musical vision and bring it to life. Specs: - Quantizer with support for 20+ pre defined as well as custom scales - Harmonizer with up to 4 additional voices - Arpeggiator with 10 modes, note repeates, ratchets and more - Process MIDI from any source - Standalone use via internal keyboard Supports: - Standalone - AUv3

About

Prism MIDI Sequencer

This app is a powerful 16-track MIDI step sequencer designed for iOS devices. It allows users to create complex musical patterns with high resolution, elastic timing, and per-step control. It integrates with external synths and samplers, offering extensive features for melody, harmony, and drum sequencing.

Highlights
  • 16-track AUv3 MIDI step sequencer
  • High resolution and elastic timing
  • Per-step control and step FX
  • Scale modes and flow modes for tonal tracks
  • 16 mini-sequencers per drum track
  • LFOs, arpeggiator, and generative tools
  • Scene and mute profile performance modes
Read full description

Prism is a 16-track AUv3 MIDI step sequencer for iPhone and iPad that turns sparks of inspiration into living, breathing music. It’s built for touch and flow—pair it with your favorite synths, samplers, drum apps, and gear. Key Features ------------- [ Sequencing Engine ] ---------------------- - High resolution: 1/32 steps, up to 512 trigs/pattern, swing, polyphony, micro-timing per step - Elastic timing: per-sequence lengths plus smooth speed changes for real polyrhythm/polymeter - Per-step control: parameter locks and Step FX - Playback modes: Standard, Overlap, Trig Legato, Drone - Capture everything: live record with quantize, retroactive recording (always listening), and tap-in steps - Human feel & probability: Chance, Every, Hold, Range, Accent [ Tonal Tracks (Melody & Harmony) ] ------------------------------------ - Always in key: scale modes across the app (use built-in scales or create your own) - Note input modes: Poly, Chord Simple, Chord Multi, Chord Blocks - Flow modes (musical logic): Standard, Peek, Echo, Melt, Mirror - Per-Trig Step FX: Velocity, Pitch, Ratchet, Strum - Multi-Seq: 4 independent sequencers per tonal track to weave interlocking parts - Import and edit .MIDI files [ Drum Tracks (Kits & Samplers) ] ---------------------------------- - 16 mini-sequencers per drum track with independent settings, FX, and controls - Modular linking, advanced layering, and Drum↔Tone interactions for shared timing tricks - Drum profiles for fast kit routing and universal connectivity - Per-Trig Step FX (drum): Velocity, Length, Ratchet, Flam [ Modulation, Generative & Creative Tools ] ------------------------------------------- - 6 LFOs per track (track-tied and CC-tied) for tempo-synced movement and evolving patterns - Per-track/pattern 16-step Arpeggiator—from classic to experimental - Harmonizer and Hue Sequencer for chord color and phrase rotation - Tape-style MIDI Slicer & Looper (per track/pattern) for instant remixing - Smart randomizers: one-tap generation for drum patterns, sequences, and fx. [ Performance, Workflow & UI ] ------------------------------ - Scenes, mute profiles, and bar looper to play, capture, and perform. - Fast edits: copy, paste, multi-select, quick duplicate - Multi-touch keypad matrix & sequencer for hands-on control - Light & Dark themes - Host-aware saving (internal presets + AUv3 state) [ Hardware & Host Integration ] ------------------------------- - Deep, bi-directional control for Novation Launchpad (Pro, Mk3, Mini, X) and Launchkey Mini MK4 with LED feedback & mappings - External MIDI in/out/thru, per-track channel routing - AUv3 works in leading hosts (e.g., AUM, Logic Pro for iPad) [ Timing & Specs ] ------------------- - High-precision engine: 480 PPQN for tight playback at any tempo - iPhone & iPad AUv3 (MIDI-only; no built-in sounds) ---------- Find more info at sites.google.com/view/prism-midi-sequencer/home Happy creating, y’all. —A Mortal Mage

Screenshots

Harmonicer4 screens
Prism MIDI Sequencer4 screens

Verdict

The call

The clearest difference is price: Harmonicer at $7.99 against Prism MIDI Sequencer's $19.99. Harmonicer also leads on in-app purchases (none vs 5) and update cadence (every 4 days vs every 2 weeks). On rating, review sentiment, ratings volume and ads 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

Harmonicer costs $7.99 and Prism MIDI Sequencer $19.99 up front. Prism MIDI Sequencer sells 5 one-off in-app purchases. Harmonicer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Harmonicer against 4.8 for Prism MIDI Sequencer. Both are backed by a comparable volume of ratings — 12 and 33 respectively. Written reviews are what separate them: 80% of Harmonicer's written reviews are positive against 86% of Prism MIDI Sequencer's.

UpkeepUpdate frequency

Harmonicer ships an update every 4 days, Prism MIDI Sequencer every 2 weeks. The most recent releases landed on September 17, 2026 and September 21, 2026 respectively.

Scorecard6 real differences · 4 level
Harmonicer versus Prism MIDI Sequencer: the parameters behind the verdict, then further details
ParameterHarmonicerPrism MIDI Sequencer
Price$7.99 — better$19.99
Rating4.7 (12 ratings)4.8 (33 ratings) — better
Positive reviews80.0% of reviews85.7% of reviews — better
Number of ratings1233 — better
Update frequencyEvery 4 days — betterEvery 2 weeks
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS11.0 — better16.0
Further details — not scored
Size23 MB55 MB
Age rating4+4+
DeveloperKai ArasTyler Quatraro

Customer experience

Harmonicer

All ratings12 ratings
Positive91.7%
Neutral8.3%
Negative0.0%
Written reviews5 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

Prism MIDI Sequencer

All ratings33 ratings
Positive93.9%
Neutral3.0%
Negative3.0%
Written reviews21 reviews
Positive85.7%
Neutral4.8%
Negative9.5%

In-app purchases

None

Harmonicer

No in-app purchases

5 purchases

Prism MIDI Sequencer

One-time5
  • LFO Extension$4.99
  • Step FX$4.99
  • Multi-Sequencer [Tone Tracks]$4.99
Show 2 more
  • Launchkey Mini MK4 Control$4.99
  • Euclidean Sequencer Extension$4.99

Questions

Is Harmonicer free?
Harmonicer costs $7.99, with no in-app purchases.
Is Prism MIDI Sequencer free?
Prism MIDI Sequencer costs $19.99, and also offers in-app purchases.
Which has better reviews, Harmonicer or Prism MIDI Sequencer?
Prism MIDI Sequencer is rated higher. Harmonicer averages 4.7 out of 5 from 12 ratings, while Prism MIDI Sequencer averages 4.8 from 33 ratings.
Do Harmonicer or Prism MIDI Sequencer have ads?
Neither Harmonicer nor Prism MIDI Sequencer shows ads.
Which is updated more often, Harmonicer or Prism MIDI Sequencer?
Harmonicer ships an update every 4 days, and Prism MIDI Sequencer every 2 weeks. Most recently, Harmonicer was updated on September 17, 2026 and Prism MIDI Sequencer on September 21, 2026.

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