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.
Calm Radio offers over 700 channels of music and sounds designed to help you relax, focus, and sleep better
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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Generating… usually about a minute.
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 Calm Radio - Music to Relax: 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 streams
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inconsistent audio quality
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Overwhelming number of categories
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Complicated subscription management
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.
Calm Radio offers over 700 channels of music and sounds designed to help you relax, focus, and sleep better. Our carefully curated genres include Easy Listening, Pop/Rock, Wellness, Sleep, Classical, Nature Sounds, Christian Music, and Audiobooks—each offering a diverse selection of channels tailored to your needs. Whether you're looking for meditation music, sleep sounds, or soothing classical melodies, we have the perfect channel for you. Enjoy the relaxing ambiance of smooth jazz, focus-enhancing music, and calming soundscapes that bring peace to your day. Explore Our Music Genres: • Easy Listening: Unwind with acoustic melodies, focus & relaxation music, smooth jazz, world music, and festive holiday tunes. • Pop/Rock: From lounge music and contemporary mixes to country blues, folk, and vintage classics, enjoy an uplifting listening experience. • Wellness: Find balance with guided meditation, mindfulness music, stress relief melodies, guided affirmations, and even unique sounds created from plants. • Sleep: Drift into deep rest with sleep inducers, bedtime stories, binaural sleep music, and calming sleep sounds. • Classical: Experience the richness of classical music through different moods, instrumental compositions, and legendary composers from Baroque to the modern era. • Nature Sounds: Immerse yourself in the sounds of nature—birdsong, flowing water, white noise, gentle creatures, and atmospheric motion. • Christian Music: Tune in to inspiring Christian music for spiritual peace and connection. • Audiobooks: Enjoy fiction, non-fiction, children’s stories, wellness books, and poetry narrated beautifully for a soothing listening experience. It’s no secret that calming music can reduce stress and enhance daily harmony, that’s why you need Calm Radio — the world’s largest selection of relaxing melodies, including sleep sounds, guided mindfulness meditations, nature-fusion, classical music, and the calming sounds of smooth jazz and pop. Whether you seek relaxation, stress relief, or deep sleep, Calm Radio is the perfect app to help you unwind. What Our Listeners Say: Described by The New York Times as “The most popular spiritual author in America,” Eckhart Tolle is just one of our loyal listeners, stating: “I very much enjoy listening to Calm Radio. It’s my favorite station.” Key Features of the Calm Radio App: • Sleep Timer: Program your calming music in intervals. • Equalizer Tone Controls: Ensure you get the best out of music, just the way you like it. • Favorites List: Easily access your preferred relaxing melodies. • Three-Layered Nature Sound Channels with Music: Enjoy calming nature sounds mixed with any channel you like. • Track-Skip: Easily switch between your favorite music. • Unlimited Listening: Relax all day with no interruptions! Let the Facts Speak for Themselves: • Nearly six million monthly listening hours • Over one million unique monthly users • Over 700 channels of calming sounds and music • 4.6-star rating on Apple’s App Store • “Best New Update” — Apple 2025 Membership Features: With a premium membership, you unlock a world of relaxation and immersive listening experiences: • Access to over 700 relaxing music channels, including sleep music, meditation music, and classical compositions. • Ad-free listening, so you can enjoy uninterrupted moments of peace. • A soundscape mixer that allows you to blend soothing nature sounds with your favorite music. • High-definition audio for the ultimate listening experience. • Extended playlists for continuous relaxation and focus. • The ability to skip channels effortlessly, ensuring you always find the perfect sound for your mood. Balance both your mind and body with sleep melodies — download Calm Radio now to experience relaxation, meditation, and stress relief like never before. Terms of Service: https://calmradio.com/en/terms Privacy Policy: https://calmradio.com/en/privacy
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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.