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
Miximum: Smart Playlist Maker
Miximum brings the power of Apple Music Smart Playlists to your iPhone and iPad.
$2.49 · In-app purchases
PRICE
$2.49
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
525 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 Miximum: Smart Playlist Maker: 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
Allow users to customize playlist cover images and descriptions.
Assumption to check: Limited customization options for playlists
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social sharing options to share playlists with friends.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Improve audio playback stability and error handling.
Assumption to check: Occasional bugs during song playback
Validate with people who use this workflow before building.
Hypothesis 4
Implement offline listening capabilities by allowing users to download playlists.
Assumption to check: Lack of offline functionality
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
Miximum brings the power of Apple Music Smart Playlists to your iPhone and iPad. Create Mixes that automatically update based on rules you define. Rediscover your music library and enjoy a truly personalized listening experience. Effortless Automation: • Intuitive rule creation: Easily set criteria based on genre, artist, play count, date added, and more. • Fine-tune your Mixes with advanced logic: combine rulesets with "and" & "or”, and limit by song count or duration. • Live previews: See your Mix update in real-time as you adjust the rules. Seamless Integration: • Works with your Music.app library: Access all your music, whether you subscribe to Apple Music or not. • Combine and listen: Play multiple playlists together for unique listening experiences. • Export static playlists: Create snapshots of your Mixes to use in Apple Music and other apps. • Pure, ad-free listening experience: No interruptions, no distractions. Just you and your music. Rediscover Your Music: • Automatic updates: Your Mixes stay fresh and relevant as your library evolves. • Endless possibilities: Create Mixes for specific moods, activities, or discoveries. • Never get bored: Enjoy a constant stream of music tailored to your tastes. Miximum is perfect for those who: • Are Smart Playlist power users: You love this feature on desktop and want it on your iPhone. • Have a large music library: You need powerful tools to organize and enjoy your collection. • Love discovering new music: Create Mixes that surface hidden gems based on your preferences. • Want a personalized experience: Tailor your listening to your unique tastes and moods. Download Miximum today and unlock the full potential of your Apple Music library.
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
React Navigation
Axios
BUILD KIT DIFFICULTY
Intermediate
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.
