App Overview

Fugue Machine Rubato icon

Fugue Machine Rubato

Alexandernaut · Music

Bend time

$29.99 · In-app purchases

PRICE
$29.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.8
67 ratings · Top 5%

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

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Build Kit

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A product spec, screen plans, and build steps for your coding agent.

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What's included18 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
  • Keep an editable draft if export fails.

Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

Differentiate and validate

Hypothesis: Contractors need faster repeat invoices more than more templates.

First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.

The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.

Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.

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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Fugue Machine Rubato: map the core Music workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Include advanced editing tools like MIDI input and complex automation.

Assumption to check: Limited pattern editing features compared to advanced DAWs.

Validate with people who use this workflow before building.

Hypothesis 2

Integrate social sharing options for users to share patterns with friends.

Assumption to check: No social sharing features.

Validate with people who use this workflow before building.

Hypothesis 3

Introduce a freemium model with basic features for free and premium features behind a paywall.

Assumption to check: High price point for casual users.

Validate with people who use this workflow before building.

Hypothesis 4

Add in-app tutorials and a community forum for user support.

Assumption to check: Lack of comprehensive user support and tutorials.

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

Bend time. Automate notes. A single grid as a multi-dimensional musical canvas — for iPad, iPhone, and Mac. Fugue Machine Rubato dives deeper into the multi-playhead piano roll concept of Fugue Machine Classic by adding time-bending playheads, parameter automation, and much more. At the heart of the sequencer is a nonlinear time engine that lets playheads move with a natural — or surreal — feel. Unlike conventional sequencers, where time advances at a constant rate, time in this engine can expressively accelerate, decelerate, freeze, and change direction. Playheads are now free to swing, strum, bounce, move elastically, and more. Built upon the time engine is a robust parameter automation system with time-bending automation playheads and envelopes sculpted with points, curves, and shapes. Nearly everything can be automated — even the notes. Eight years in the making, Fugue Machine Rubato is rock-solid and absolutely packed with features. HIGHLIGHTS • Bend time with curves, rates, and offsets • Automate notes and nearly everything else • Sculpt envelopes with curves and shapes • Position playheads anywhere on the grid • Play up to eight playheads at once • Apply note echoes per-playhead • Arpeggiate notes from multiple playheads • Blend notes from multiple playheads • Offset, stack, spread, and invert pitches • Clamp, compress, and expand velocities • Program drums via per-note Drum Trigs • Route notes to up to eight MIDI outputs • Organize patterns in nestable folders • Launch patterns quantized to the beat • Revert state via auto-saved Snapshots • Learn contextually via popovers • Explore ~150 built-in patterns • Control via touch, keyboard, and cursor • Resize Mac window at native resolution COMPATIBILITY Fugue Machine Rubato supports iPad, iPhone, Mac (Intel & Apple Silicon), Ableton Link, MIDI, and AUv3* MIDI. With the included AUv3 MIDI plugin, you can run multiple instances of Fugue Machine Rubato within AUv3 host apps — like AUM, Logic Pro for iPad, Loopy Pro, and Cubasis. UNIVERSAL APP — ONE-TIME PURCHASE Pay once and use on iPad, iPhone, and Mac. LEARN MORE — TRY A FREE DEMO To learn more or try a free demo via TestFlight, visit fuguemachinerubato.com.

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Screenshots

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Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

SUGGESTED BUILD STACK
React Native
Expo
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BUILD KIT DIFFICULTY
Advanced

From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.