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.
StemFM lets you explore an extensive library of music
Free · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for StemFM: 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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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
Assumption to check: Limited offline access to music
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of personalized recommendations
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Inconsistent playback quality
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
StemFM lets you explore an extensive library of music. Stream millions of songs, mix tracks, or let AI DJ for you all on your phone. StemFM separates the stems for every song, letting you change the vocals, drums, bass, or melody in real time or let AI do it for you. Listening and Mixing Modes • Classic Mode for regular listening with control of each song’s four stems • Mix Mode for regular seamless transitions between tracks with matched tempo and timing • DJ Mode for regular AI DJ set experiences that react to your listening • Infinite Mode for regular endless playback with smooth AI driven changes Choose StemFM as your go-to music Listening app: • Listen to over 100 million songs and mix any two tracks with AI • Explore specially crafted artist stations and AI powered mixes • Search for songs, albums, artists, mixes, and stations • Support artists through a fair pay system based on your actual listening time StemFM is more than just a streaming service. Fall in love with your favourite songs over and over again by creating new variations. Discover the hottest new releases, mixes, sets, and more. • Press play to stream millions of songs • Try AI mixes that create smooth transitions between tracks • Create and share artist inspired stations • Share mixes and stations with friends and family where supported • Discover personalized mixes and stations and collaborate with friends • See your most played songs, mixes, and more with yearly StemFM Wrapped • Stream music across your devices with Stemplayer StemFM Subscription • Seamlessly mixed music with AI • Unlimited songs and mixes in one place • Ad free listening without interruptions • Full on demand playback • Superior sound quality on supported devices • Personalized stations that adapt to your taste • Enjoy the app on desktop, phone, and tablet • No contract required and cancel any time • Fair pay for artists and labels StemFM lets you create and enjoy music wherever you are. Listen to your favourite songs and discover new music, mixes, and more with the StemFM app. StemFM uses advanced AI to separate every song into four stems, including vocals, drums, bass, and melody, so you can adjust, mute, or blend elements live. Whether you are listening casually or crafting detailed mixes, the AI music engine adapts naturally to your style. Follow us on Instagram: https://www.instagram.com/stemplayer Follow us on TikTok: https://www.tiktok.com/@stemplyer Follow us on X: https://x.com/stemplayer Join us on Discord: https://discord.gg/ZKcHqhwu3C
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.