FormKey vs StepLoom
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FormKey
This app is an intuitive MIDI controller that helps musicians improve by using shapes for notes and colors for octaves. Its unique isomorphic keys aid in pattern recognition and chord discovery, making music creation more accessible.
- Shape-based note input
- Color-coded octaves
- Isomorphic key layout
- Pattern recognition aid
- Chord discovery assistance
- Future update commitment
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Unlock your music potential. FormKey is the first music suite that helps you become the musician you've always imagined being, just by using it. INTRODUCING FORM Form is a new way to read and create music. Notes become shapes. Octaves become colors. Duration becomes a simple to read fraction. You can learn to read and play music in minutes. FormKey is the first release of the Form notation language, an open licensed music language designed to create instant music literacy. With the goal being to become a standard you'll see everywhere. THREE MODES: CREATE, LEARN, AND CONTROL • Create mode gives you a 16-track sequencer built on the classic drum machine workflow, modernized for today. Use your own AUv3 plugins or the three we built in to create full tracks from the ground up. • Learn lets you play and read your way through classical pieces while Form teaches you exactly what the music is doing, note by note. • Control turns FormKey into a MIDI controller for your external workflows, so it fits right into the setup you already have. THREE BRAND NEW AUv3 PLUGINS • Tone is a fully interactive subtractive synth that makes synthesis make sense. Every knob and connection is something you can hear and understand, so the architecture of a sound stops being a mystery. • Wave is a file-based sampler that lets you chop audio from your own device into something new. Slicing, shaping, and rearranging samples feel effortless instead of technical. • Pn0 is a modeled piano designed to sound rich while being incredibly simple to use • All 3 work in any host, so the instruments you learn in FormKey come with you wherever you go. SCALE MODE Reshape the keyboard to any of 26 scales, so every note you play stays in key. Choose from: • Major and minor: Major, Natural Minor, Melodic Minor, Harmonic Minor • Modes: Ionian, Dorian, Phrygian, Lydian, Mixolydian, Aeolian, Locrian • Pentatonic and blues: Major Pentatonic, Minor Pentatonic, Blues • Symmetric: Whole Tone, Whole-Half Diminished, Half-Whole Diminished, Augmented Hexatonic • World and exotic: Hungarian Minor, Neapolitan Minor, Byzantine, Enigmatic, Hirajoshi, In Sen, Kumoi, Iwato We've refined the interface across the app, making FormKey easier and more enjoyable to use. Every feature in FormKey is free to try. In celebration of our launch, $14.99 unlocks everything for the life of the app. We hope you love it as much as we do.
StepLoom
Create electronic music with a touch-friendly groovebox. Quickly sketch beats, basslines, and melodies using a step sequencer, piano-roll editing, and arrangement views. Supports AUv3 plugins for expanded sound design.
- Touch-friendly beat and melody workflow
- Step sequencer and piano-roll editing
- Timeline, Session, and Flow arrangement views
- AUv3 instrument and effect plugin support
- Mixer controls for sound shaping
- MIDI input and external clock sync
- Export audio, stems, or MIDI
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StepLoom is a fast, touch-first electronic music sketchpad for making beats, loops, basslines, and melody ideas on iPhone and iPad. It gives you the focus of a compact groovebox without the weight of a full DAW, so you can start a rhythm, shape a synth line, try an AUv3 instrument, arrange patterns, and keep moving while the idea is fresh. Create drum patterns with a step sequencer, write melodic parts with piano-roll style editing, stack chords, add legato, adjust BPM, mix tracks, and switch sounds. Add Sample tracks by importing audio or recording directly in the Tracks view, then use the waveform editor to trim, reverse, normalize, tune, and shape One-shot or Loop playback. The project Media Library keeps custom audio available for reuse and arrangement. Turn loops into songs with three complementary arrangement views: shape Patterns and audio clips on the Timeline, launch quantized Patterns and Scenes in Session, or build visual paths and probability rules in Flow. Draw or record automation for mixer controls and supported AUv3 parameters. When you want to go beyond the built-in sounds, add AUv3 instrument or effect plugins, choose exposed plugin presets, open compatible plugin interfaces, and activate Plugin Sound directly from the sound picker. Optional iCloud sync keeps compatible projects and project media available across your Apple devices. StepLoom continues to work locally when sync is disabled. StepLoom is built for quick electronic music drafts: open the app, tap a grid, hear the result, and turn a loop into a structured idea. Main features: - Touch-friendly beat and melody workflow - Drum, melody, and custom Sample tracks - Step sequencer with playback highlight and loop control - Piano-roll style melody editing with chords and legato - Audio import and microphone sample recording - Waveform sample editor with trim, reverse, normalize, gain, tuning, One-shot, and Loop controls - Project Media Library for reusable custom audio - Timeline editing with drag, resize, layers, sections, loop ranges, and multi-selection - Quantized Pattern and Scene launching with Session performance recording - Blueprint-style Flow rules with Next, Jump, Random, Stop, and probability - AUv3 instrument and effect plugin slots - Plugin preset reading for AUv3s that expose factory presets - Plugin Sound option for playing tracks through AUv3 instruments - Mixer and AUv3 parameter automation - Mixer controls for volume, pan, EQ, filter, drive, meters, master gain, and limiter - MIDI input and external clock sync options - Optional iCloud project and media synchronization - Export full songs or the current pattern as audio, stems, or MIDI - Adaptive iPhone and iPad layouts StepLoom is for producers, beatmakers, songwriters, and electronic music learners who want a focused place to capture musical ideas before moving into a larger DAW.
Screenshots
Verdict
The clearest difference is review sentiment: StepLoom at 100% against FormKey's 50%. StepLoom also leads on rating (5.0 vs 4.3) and in-app purchases (none vs 1). FormKey's advantage is price (Free vs $3.99) and ratings volume (6 vs 2). On ads, monetization model 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
FormKey is free to download; StepLoom costs $3.99 up front. FormKey sells 1 one-off in-app purchase. StepLoom asks for nothing beyond the download.
StepLoom holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 6 and 2 respectively. Written reviews point the same way: 50% of FormKey's written reviews are positive against 100% of StepLoom's.
FormKey ships an update fortnightly, StepLoom every 2 days. The most recent releases landed on October 6, 2026 and October 11, 2026 respectively.
| Parameter | FormKey | StepLoom |
|---|---|---|
| Price | Free — better | $3.99 |
| Rating | 4.3 (6 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 50.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 6 — better | 2 |
| Update frequency | Fortnightly | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | Paid |
| Devices | iPad | iPhone, iPad, Mac — better |
| Requires iOS | 18.6 | 17.0 — better |
| Further details — not scored | ||
| Size | 86 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Polyhedra | 宁 徐 |
Customer experience
FormKey
StepLoom
In-app purchases
FormKey
- FormKey Full Unlock$14.99
StepLoom
No in-app purchases









