# StepPolyArp vs Prism MIDI Sequencer

The clearest difference is update cadence: Prism MIDI Sequencer at every 2 weeks against StepPolyArp's every 2 months. Prism MIDI Sequencer also leads on monetization model (free with in-app purchases vs paid). StepPolyArp's advantage is device support (4 vs 2). On price, rating, review sentiment and ratings volume there is nothing between them.

StepPolyArp costs $19.99 and Prism MIDI Sequencer $19.99 up front. StepPolyArp sells 2 one-off in-app purchases and Prism MIDI Sequencer sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.8 for StepPolyArp against 4.8 for Prism MIDI Sequencer. Both are backed by a comparable volume of ratings — 48 and 33 respectively. Written reviews split almost evenly too, at 87% and 86% positive.

StepPolyArp ships an update every 2 months, Prism MIDI Sequencer every 2 weeks. The most recent releases landed on September 22, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | StepPolyArp | Prism MIDI Sequencer |
| --- | --- | --- |
| Price | $19.99 | $19.99 |
| Rating | [4.8 (48 ratings)](https://appshunter.io/ios/app/steppolyarp/id1361313588/reviews) | [4.8 (33 ratings)](https://appshunter.io/ios/app/prism-midi-sequencer/id6502302630/reviews) |
| Number of ratings | **48** | 33 |
| Positive reviews | **86.7% of reviews** | 85.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 38 MB | 55 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Laurent Colson](https://appshunter.io/developer/381525765) | [Tyler Quatraro](https://appshunter.io/developer/1724470298) |

## What reviewers say

### StepPolyArp

[App page](https://appshunter.io/ios/app/steppolyarp/id1361313588)

This app functions as a real-time polyphonic and polyrhythmic MIDI step arpeggiator and sequencer. It can generate melodic patterns from input or operate as a standalone sequencer. Save and sync unlimited presets with iCloud, featuring extensive customization for patterns and step controllers.

**Highlights:** Standalone app and AUv3 MIDI effect plugin, Arpeggiator and step sequencer modes, Programmable step matrix with transposition lines, Polyrhythmic step controllers, Internal sound bank, Ableton Link and MIDI sync support, Unlimited preset saving with iCloud sync

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Dance Horizons | $4.99 | one-time |
| Analog Sequence | $4.99 | one-time |


### Prism MIDI Sequencer

[App page](https://appshunter.io/ios/app/prism-midi-sequencer/id6502302630)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| LFO Extension | $4.99 | one-time |
| Step FX | $4.99 | one-time |
| Multi-Sequencer  Tone Tracks | $4.99 | one-time |
| Launchkey Mini MK4 Control | $4.99 | one-time |
| Euclidean Sequencer Extension | $4.99 | one-time |


## Frequently asked questions

### Is StepPolyArp free?

StepPolyArp costs $19.99, and also offers in-app purchases.

### Is Prism MIDI Sequencer free?

Prism MIDI Sequencer costs $19.99, and also offers in-app purchases.

### Which has better reviews, StepPolyArp or Prism MIDI Sequencer?

StepPolyArp and Prism MIDI Sequencer are both rated 4.8 out of 5 on the App Store, from 48 and 33 ratings respectively.

### Do StepPolyArp or Prism MIDI Sequencer have ads?

Neither StepPolyArp nor Prism MIDI Sequencer shows ads.

### Which is updated more often, StepPolyArp or Prism MIDI Sequencer?

StepPolyArp ships an update every 2 months, and Prism MIDI Sequencer every 2 weeks. Most recently, StepPolyArp was updated on September 22, 2026 and Prism MIDI Sequencer on September 21, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*