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 is the #1 app for sleep, meditation, and relaxation
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: map the core Health & Fitness 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 free content compared to premium options
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Difficulties in finding specific types of meditations
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Subscription management can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of community features for user engagement
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 is the #1 app for sleep, meditation, and relaxation. Find anxiety relief, stress relief, and better sleep through breathing exercises, sleep sounds, deep sleep music, and mindfulness programs for insomnia, beginner meditation, and beyond. Downloaded by 180 million people worldwide. Fall asleep faster with Sleep Stories, bedtime stories for adults narrated by Matthew McConaughey, Stephen Fry, P\!nk, Bob Ross, and more. Only on Calm. Manage stress, relieve anxiety, improve your sleep cycle, and refocus your attention. Apple App of the Year. Apple Editors' Choice. Happiest App in the World (Center for Humane Technology). 3M+ five-star reviews. Recommended by top psychologists, therapists, and mental health experts. SLEEP STORIES — ONLY ON CALM * Drift off to Matthew McConaughey's Wonder — a dreamy journey through the mysteries of the universe * Travel through the village of Provence with master storyteller Stephen Fry in Blue Gold * Fall asleep to the soothing brush strokes of beloved painter Bob Ross in Happy Little Zzzs * Tackle insomnia with 100+ exclusive Sleep Stories, new content added every month MEDITATION & MINDFULNESS * Beginner meditation to advanced practice — guided sessions for every experience level * Daily Calm with Tamara Levitt, Daily Jay with Jay Shetty, Daily Trip with Jeff Warren * Mindfulness topics: deep sleep, anxiety relief, stress relief, focus, breaking habits, self-care, personal growth, and more * 7- and 21-day mindfulness programs to build a lasting practice ANXIETY RELIEF & RELAXATION * Breathing exercises and breathwork to ease anxiety, stress, and insomnia * Bilateral stimulation music and neuroacoustic sounds for nervous system regulation and somatic relaxation * Guided breathwork for stress relief, anxiety relief, and deep calm * Stress management and self-healing through Dailies: programs for social anxiety, personal growth, and mood balance * Mindful movement and stretching with Daily Move SLEEP SOUNDS, MUSIC & SOUNDSCAPES * Calming music, nature sounds, and sleep sounds: ocean waves, heavy rain, campfire, and more * Exclusive focus and sleep music from top artists * Full soundscapes and sleep sounds to help you relax, meditate, and sleep soundly ALSO FEATURING * Daily Streaks & Mindful Minutes — emotion and mental health tracker * Calm saves your meditation and sleep sessions to your Apple Health app. Mental health is health. Calm is for anyone looking to improve their sleep, manage stress, and address everyday anxiety. Meditation novice or seasoned expert. Take a deep breath and find your Calm. Calm is free to download and use. There are never any ads and some of the programs and features are free forever. Some content is only available through an optional paid subscription. Be sure to check out our Apple Watch app to quick-start breathing exercises and track your meditations. Subscription pricing and terms: Calm offers an auto-renewing monthly subscription at $14.99/month and an auto-renewing yearly subscription at $69.99/year to provide you with unlimited access to the Calm Collection while you maintain an active subscription. Payment will be charged to the credit card connected to your iTunes Account when you confirm the initial subscription purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24-hours before the end of the current subscription period. Your account will be charged for renewal within 24-hours prior to the end of the current period, and the cost of the renewal will be identified. You may manage your subscription and auto-renewal may be turned off by going to your Account Settings after the purchase. Any unused portion of a free trial period, if offered, will be forfeited when you purchase a subscription, where applicable. Read more about our terms and conditions here: Terms of service: https://www.calm.com/terms Privacy policy: https://www.calm.com/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.