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.
App Overview
PlayTally: Apple Music Stats
PlayTally is the ultimate music companion that takes your listening experience to the next level.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
378 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 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.
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
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for PlayTally: Apple Music Stats: 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
Expand chart types and enhance interactivity.
Assumption to check: Limited data visualization options compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate sharing options for users to share their stats.
Assumption to check: No social sharing features, limiting user engagement.
Validate with people who use this workflow before building.
Hypothesis 3
Add recommendations for playlists or songs based on user data.
Assumption to check: Lack of personalized recommendations based on listening habits.
Validate with people who use this workflow before building.
Hypothesis 4
Enable offline access for previously loaded data.
Assumption to check: No offline capabilities for viewing stats.
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
PlayTally is the ultimate music companion that takes your listening experience to the next level. REAL-TIME REPLAY Now you have the power to relive your favorite songs anytime, not just on a yearly basis. PlayTally generates lists in real-time, ensuring you're always up to date with your music trends. Choose any date range and discover your top tracks for that specific period. Plus, you can easily mark tracks like white noise and sleep sounds to keep them out of your Trends list. TRACK YOUR HISTORY Track your music history effortlessly by syncing PlayTally data across multiple devices through iCloud Music Library. you can even track additional Apple Music devices. Take a trip down memory lane and see what you were jamming to on any given day. Plus, create personalized playlists from your music history. EARN AWARDS As you dive deeper into your music journey, PlayTally rewards you with badges for your dedication and growing music collection. It's like earning activity awards for your ears! SEE YOUR STATS Explore your music collection like never before with PlayTally's advanced statistics and charts. Easily sort and browse through large libraries based on your listening habits. Gain valuable insights into your music preferences over time and share your most impressive stats with friends and followers. COMPLETELY AD-FREE. No distractions, no interruptions. PlayTally is completely ad-free and seamlessly integrates with your Apple Music. No extra accounts, signups, or subscriptions required. PRIVACY FIRST Your privacy is our priority – your data stays on your device and personal iCloud storage, and you have the option to delete it whenever you want. If you wish, you can also export and backup your data in CSV format. You're in control. NO VIBE-CODING PlayTally is developed by an independent developer. No AI has been used in it's development. — TIPS FOR BEST PERFORMANCE For optimal performance, make sure PlayTally regularly scans your music library. Create a convenient automated shortcut to open PlayTally daily or weekly, ensuring your data is always up to date and accurate. NOTE: Because PlayTally tracks its own data, it cannot reconstruct playback history from before it was installed.
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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
Victory Native
React Query
React Native Async Storage
React Navigation
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.
