StepBud vs Mass
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
StepBud
This app is a versatile MIDI sequencer that allows for unlimited steps and detailed control over each step's parameters. It integrates with other music apps and supports various sequencing modes for creative performances.
- Unlimited steps
- Step parameter control (note, velocity, rate, etc.)
- Custom MIDI CC messages
- Step locking and skipping
- Master fader with copy/shift modes
- Step Editor for detailed note editing
- Arpeggio modes (up, down, random)
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StepBud is a MIDI Sequencer with Audio Unit AUv3 plugin, Audiobus and Ableton Link. Add an unlimited number of steps to your sequencer. Your steps appear with a LED and a fader on top of your screen. You can change the active mode that your step faders displaying/controlling. - Set the current note or chord in range of the scale and key you selected with respect the range of the octave you want to focus, - Set the velocity, rate, gate time, modulation, pitch bend, portamento, probability and swing for each step, - Try increasing the rate and repeat count your steps if you want to add more flavor. - Send unlimited custom MIDI CC messages if you want to control your hardware or software synth parameters. - Lock steps if you don't want them to change their value. - Skip steps for creating interesting live performances. Below the step faders, you have a master fader where you can control your entire sequencer. It has two modes which you can change from the settings strip on the bottom of the app. - In copy mode, it assigns its value to each step. - In shift mode, it shifts up or down each step. If you want to go off-scale or try some crazy chords on some of your steps, or maybe on all of them, you can go to the Step Editor by double tapping the LED of the step you want to edit. In StepBud's powerful Step Editor, you can set your step's notes either from the virtual keyboard or your connected MIDI keyboard. Don't forget to enable MIDI in port of your MIDI keyboard or the you want to receive MIDI from the settings menu. You may also preview the selected notes by pressing the preview button in Step Editor for making sure you created the perfect sound for your particular step. You can also toggle the steps you want to disable by tapping its LED. If you long-press the LED, you can access a menu where you may copy/paste the steps around, remove them or edit them. If you enable the lock mode from the settings strip on the bottom of the app, you may adjust each visible step fader on the screen by a single swipe gesture without having to lift your finger up. Try to change your arppegio mode from the settings strip. You can sequence your steps up, down, up-down or random order. StepBud is a MIDI sequencer app and it does not generate sounds itself. You need to route its MIDI out port in the settings menu to the audio app you want to sequence. Please note that you need to have an iOS 11+ device and an Audio Unit host application such as AUM, apeMatrix, Cubasis, BeatMaker or Audiobus in order to use the StepBud as an Audio Unit plugin. And don't forget to route StepBud's MIDI out to the app or audio unit you want to sequence. StepBud's MIDI layer powered by free and open-source project AudioKit https://github.com/AudioKit/AudioKit Also, StepBud offers its core components for free on GitHub. Feel free to star, fork or contribute. https://github.com/cemolcay/MusicTheory https://github.com/cemolcay/LiveFader https://github.com/cemolcay/MIDIEventKit
Mass
This app is a physics-based MIDI generator that allows musicians to create complex generative sequences, organic modulations, and explore boundless musical experimentation. It offers a powerful toolkit for creative control and can be used as a standalone application or an AUv3 plugin.
- Generative Sequences
- Living Modulations
- Euclidean Pattern Sequencing
- Flexible MIDI CC
- Physics-Based Animation
- Standalone & AUv3 Plugin
- MIDI Sync
- iCloud Sync
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Open the door to new musical dimensions with Mass — a physics-based MIDI generator crafted to inspire musicians across genres. Add complexity to your sequences, explore generative patterns, or create organic modulations; Mass is your gateway to boundless musical experimentation. • Generative Sequences: Sculpt intricate melodies and rhythms that evolve over time. • Living Modulations: Shape fluid, natural modulations that respond like living elements. • Total Creative Freedom: Need a spark of randomness or complete control? Mass lets you move seamlessly between guided automation and full improvisation. Whether you’re diving into ambient soundscapes, exploring the depths of MIDI control, or crafting intricate modulations, Mass is your key to immersive sonic worlds. Available as a standalone MIDI generator and AUv3 plugin, Mass transforms your favorite hardware and software instruments into a sandbox of endless possibilities. With Mass, you’ll find an extensive toolkit for creative control and experimentation. Here’s what you can expect: • Euclidean Pattern Sequencing: Easily create complex sequences by layering polyrhythmic Euclidian patterns. • Flexible MIDI CC: Modulate and sequence any MIDI CC parameter, allowing you to breathe life into every detail of your sound. • Physics-Based Animation: Apply physics to sequences and modulations, creating dynamic, evolving movements within your music. • Powerful Controller: Mass is a powerful MIDI controller, allowing you to manipulate your favorite hardware and software instruments in either standalone or AUv3 modes. • MIDI Sync: Synchronize with external hardware and software using standard MIDI sync capabilities. Mass can function as the primary clock, or be synced to a host clock. • iCloud Sync: Seamlessly share your creations across devices with iCloud syncing. Work in the standalone version or AUv3 plugin, without missing a beat. With Mass, you’re free to explore musical layers, rhythms, and motion in new ways. Let it guide your creative journey, transforming each idea into a boundless musical experience.
Screenshots
Verdict
The clearest difference is rating: Mass at 5.0 against StepBud's 4.4. Mass also leads on review sentiment (100% vs 71%). StepBud's advantage is update cadence (fortnightly vs every 4 months) and price ($4.99 vs $9.99). On ads, in-app purchases and device support 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
StepBud costs $4.99 and Mass $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Mass holds the better App Store score, 5.0 against 4.4. Both are backed by a comparable volume of ratings — 38 and 11 respectively. Written reviews point the same way: 71% of StepBud's written reviews are positive against 100% of Mass's.
StepBud ships an update fortnightly, Mass every 4 months. The most recent releases landed on November 6, 2026 and November 4, 2026 respectively.
| Parameter | StepBud | Mass |
|---|---|---|
| Price | $4.99 — better | $9.99 |
| Rating | 4.4 (38 ratings) | 5.0 (11 ratings) — better |
| Positive reviews | 70.6% of reviews | 100.0% of reviews — better |
| Number of ratings | 38 — better | 11 |
| Update frequency | Fortnightly — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 8 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Cem Olcay | Usable Creations |
Customer experience
StepBud
Mass
In-app purchases
StepBud
No in-app purchases
Mass
No in-app purchases









