GridStep vs Hex MIDI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GridStep
A professional MIDI step sequencer offering a focused grid-based workflow for clear, controlled, and predictable music creation. It functions as a standalone app and an AUv3 plugin, ideal for both live performance and composition.
- Grid-based MIDI step sequencing
- Explicit edit modes for notes, velocity, slides, and mutes
- Trigger-based step advance
- Controlled pattern generation
- AUv3 MIDI effect plugin
- Standalone app functionality
Read full descriptionHide full description
GridStep is a professional MIDI step sequencer designed for clarity, control, and predictable results. It works as a standalone app as well as an AUv3 plugin. GridStep provides a focused grid-based workflow with explicit edit modes, per-step inspection, and one-shot generation tools. Every interaction is intentional, allowing patterns to evolve without ambiguity. Core Features Explicit Edit Modes - Dedicated modes for Notes, Velocity, Slides, and Mutes - Clear, consistent interactions across the grid Precision Grid Editing - Step-based grid with visible playhead and pattern length - Per-step inspector for detailed control - Efficient editing without leaving the main view Trigger-Based Step Advance - Advance the sequence using incoming MIDI triggers instead of the host clock - Enables irregular rhythms, external control, and non-linear playback - Fully compatible with standard clocked playback Controlled Generation - Pattern generation for notes, velocity, slides, and mutes - Apply generation globally, per lane, or per selection - Designed to support musical intent Performance-Focused Design - Deterministic, repeatable sequencing behaviour - Stage-safe interface optimized for quick adjustments - Predictable timing within AUv3 hosts AUv3 MIDI Effect - Works in AUv3 hosts such as AUM, Drambo, Logic, and Cubasis - MIDI-only design compatible with any synth or sampler Built for both live performance and composition, GridStep emphasizes stability, readability, and repeatable behaviour.
Hex MIDI
Read full descriptionHide full description
Hex MIDI is an isomorphic MIDI controller and microtonal synthesizer. Instead of the standard piano keyboard, notes are arranged in geometric hexagonal grids - meaning chord shapes, scales, and intervals remain identical across every key. Whether you want to play alternative keyboards like the Wicki-Hayden or Jankó, compose in 19-EDO / 31-EDO microtonal tunings, or control your DAW over MIDI and MPE, Hex MIDI gives you the tools to explore harmony through geometry. Built-In Keyboard Layouts: • Wicki-Hayden – Classic concertina layout with fifths/fourths diagonals and octave columns. • Jankó (Classic & Vertical) – Whole-tone rows with uniform chord fingerings. • Harmonic Table – Euler's Tonnetz grid: major/minor third diagonals with vertical fifths for visual chord building. • Bosanquet-Wilson (Maupin) – Generalized flat-top hex layout built for microtonal navigation. • Harpejji – Whole-tone string layout with semitone vertical progression. • Chromatic Button Accordion – Authentic C-System and B-System (Bayan) layouts. • Fourths & Fifths – String instrument tunings for guitarists, bassists, and violinists. • Major Thirds & Diminished Harmonica – Symmetrical grid layouts. • Custom Layout Editor – Build and save your own hexagonal or rectangular grids. Microtonal & Tuning Engine: • EDO Presets: 19-EDO, 22-EDO (Shruti), 24-EDO (Quarter-tone / Maqam), 31-EDO (Meantone), 41-EDO, 53-EDO, and sub-12 tunings (5-EDO Slendro, 7-EDO, 10-EDO). • Scale Formats: Bohlen-Pierce (13-EDT), Just Intonation, and custom scale generation. • Scala Support: Import standard .scl tuning files and .kbm keyboard mappings. • Visual Color Modes: 5ths spiral color coding, Tonnetz harmonic spectrum, and minimal two-tone palettes. • Note Labels: Display note names with arrow accidentals, Solfège, interval numbers, or exact Hz. MIDI & Expressive Performance: • MIDI I/O: Connect via USB MIDI to hardware synthesizers, external keyboards, and DAWs (Ableton, Logic, Reaper, Bitwig). • MPE & Vibrato: Per-note microtonal pitch-bend routing and touch vibrato. • MTS Support: Real-time MIDI Tuning Standard SysEx transmission for compatible synths. • Touch Control Pads: Integrated dual X/Y pads for assignable pitch, modulation, and CC filters. • Built-In Sound Engine: High-fidelity soundfont player with instant response.
Screenshots
Verdict
The clearest difference is price: Hex MIDI at Free against GridStep's $3.99. GridStep's advantage is in-app purchases (none vs 1) and update cadence (every 2 weeks vs monthly). On ads, device support and iOS requirement 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
Hex MIDI is free to download; GridStep costs $3.99 up front. Hex MIDI sells 1 one-off in-app purchase. GridStep asks for nothing beyond the download.
GridStep ships an update every 2 weeks, Hex MIDI monthly. The most recent releases landed on October 11, 2026 and October 4, 2026 respectively.
| Parameter | GridStep | Hex MIDI |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 5.0 (3 ratings) — better | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 2 weeks — better | Monthly |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 | 17.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 95 MB |
| Age rating | 4+ | 4+ |
| Developer | Joe Topjian | Trung Dung Hoang |
In-app purchases
GridStep
No in-app purchases
Hex MIDI
- Hex MIDI Pro$12.99








