App Overview

Longplayer icon

Longplayer

The Longplayer Trust · Music

Longplayer: a thousand years of music in your pocket!

$3.99 · In-app purchases

PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.6
11 ratings · Top 15%

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

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What's included15 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 Longplayer: 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

Offer user-generated playlists or a wider variety of music.

Assumption to check: Limited track selection

Validate with people who use this workflow before building.

Hypothesis 2

Implement offline listening for downloaded tracks.

Assumption to check: No offline playback

Validate with people who use this workflow before building.

Hypothesis 3

Introduce sharing options and social networking capabilities.

Assumption to check: Lack of social features

Validate with people who use this workflow before building.

Hypothesis 4

Allow users to customize the UI or sound settings.

Assumption to check: No customization options

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

Longplayer: a thousand years of music in your pocket! Not recommended for versions of iPhone lower than iPhone 5. Longplayer is a musical composition that has been playing since the beginning of the year 2000, and will play on, never repeating, until it reaches the point at which it first started, exactly 1000 years later. Longplayer is in effect an everlasting piece of music; its score mirrors a planetary system, six musical events whose orbits come into phase once a millennium. Until now, Longplayer has only been accessible by visiting a handful of "listening posts" or via an online stream. This app is the first standalone version of Longplayer, creating the music in real time based on the composition's thousand-year-long score. It requires no data connection and automatically synchronises itself with every other copy of the app across the globe. With this app, you become part of a community of listeners distributed through space and time, across many lifetimes. - real time high-quality playback of Longplayer, with no need for a data connection - plays in the background: listen to Longplayer while you continue to use other apps, and while your phone is locked. - real time score display - graphic and textual information explaining how it works - detailed information section about Longplayer's history, development, composition, conceptual background and much more - up-to-date news from the Longplayer website (data connection required) Recommended for headphones or external speakers. Watch a short video explaining Longplayer: http://vimeo.com/94166447 Longplayer was composed by Jem Finer and commissioned by Artangel in 1995. It is now in the care of the Longplayer Trust.

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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.

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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.