App Overview

Offline Mp3 Player - SoundSync icon

Offline Mp3 Player - SoundSync

志鹏 何 · Music

SoundSync, with its meticulous feature design, meets the music needs of users in different scenarios and creates their own music journey for each user

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
4.4
296 ratings · Top 30%

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 included16 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 Offline Mp3 Player - SoundSync: 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

Implement more features for offline listening such as curated playlists.

Assumption to check: Limited offline functionality compared to other music apps.

Validate with people who use this workflow before building.

Hypothesis 2

Add features for sharing songs or playlists with friends.

Assumption to check: No social sharing capabilities.

Validate with people who use this workflow before building.

Hypothesis 3

Incorporate an algorithm for personalized playlists based on user listening habits.

Assumption to check: Lacks personalized recommendations.

Validate with people who use this workflow before building.

Hypothesis 4

Simplify navigation and improve layout for better user experience.

Assumption to check: UI can be cluttered.

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

SoundSync, with its meticulous feature design, meets the music needs of users in different scenarios and creates their own music journey for each user. Through timely feedback and recording mechanisms, SoundSync not only enhances users' music appreciation experience, but also adds more fun and convenience to their daily lives. Whether you are focused on studying, busy with work, or looking to relax, enjoy deep sleep, or even engage in high-intensity exercise, SoundSync can provide you with suitable music categories. In order to better meet the personalized needs of users, the application provides multiple playlists, each category containing carefully selected music tracks, aimed at helping users improve focus, relieve stress, or motivate exercise. The focus timer is a powerful assistant for both learning and work. With the accompaniment of music, users can concentrate more effectively and immerse themselves in tasks. During use, SoundSync also provides users with a convenient bookmarking function, allowing you to quickly tag your favorite songs for easy enjoyment in the future. When the user selects a specific music category, the application will guide them to a dedicated page, where each category displays a unique background image and timer design to create the perfect atmosphere. After completing a certain stage of focus, users can choose to save or delete the record for easy tracking and viewing in the future. The provision of this feature not only helps users evaluate their focus efficiency, but also motivates them to continuously optimize self-management in their future work and study. Undoubtedly, SoundSync is the ideal choice for music enthusiasts who pursue efficiency and personalization. Download now!

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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
Expert

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.