App Overview

Shelf: music, books, movies icon

Shelf: music, books, movies

Koodos, Inc. · Utilities

Effortlessly track across platforms

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
4.5
3,483 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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Build Kit

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

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What's included17 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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Free quick prompt For a smaller starting point

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 Shelf: music, books, movies: map the core Utilities 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

Allow users to create custom categories.

Assumption to check: Limited categories for item organization

Validate with people who use this workflow before building.

Hypothesis 2

Implement offline storage for saved items.

Assumption to check: No offline access to saved items

Validate with people who use this workflow before building.

Hypothesis 3

Add social sharing options for items.

Assumption to check: Lack of social sharing features

Validate with people who use this workflow before building.

Hypothesis 4

Clarify benefits of in-app purchases during onboarding.

Assumption to check: In-app purchase confusion

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

Effortlessly track across platforms Connect Spotify, Netflix, Apple Music, Letterboxd, Goodreads, and more. Shelf automatically organizes what you watch, read, listen to, play & more into one evolving profile. -See your taste from every angle. -View your top artists and genres. -Scroll a chronological history of what you’ve watched and read. -Keep a living record of your cultural life. Get personalized recaps -Weekly and monthly summaries show what defined your time and how your taste shifts. Unlock experiences powered by your Shelf -Dive into insights, comparisons, trend breakdowns, and evolving tools built around your data. The more complete your Shelf, the more you can access. Browse friends’ Shelves -See what people you care about are into and explore their taste across categories. Customize your profile -Personalize your Shelf so it reflects who you are. Your data, on your terms -Private by default. You control what’s connected and what’s visible. Your history stays yours. -We safeguard your data with cutting-edge encryption tech. -The creators of Shelf are pioneers behind people taking back control of their data from the big platforms. We’re data rights activists and will fight (and build) until we all have control and ownership over our own data (see more here: https://share.shelf.im/data-rights). Shelf grows with you. -The more you add, the clearer the patterns become. The more complete your Shelf, the more it understands your taste. -It’s not another recommendation feed or social app. It’s a living record of what you’ve been into— and what that says about you. Shelf is created by a team in NYC and loved by people across the world! Featured in TechCrunch, Business Insider, Harvard Business Review and more. Follow along for updates and memes: @getashelf

Written user reviews are not shown here. Check current App Store reviews >

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
Supabase
Zustand
Axios
React Navigation
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.