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.
From the makers of Calm, the top Meditation & Mindfulness app trusted by 40M+ listeners, Calm Sleep is a new standalone app for deeper, more personalized sleep support
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 Sleep - Rest & Relax: 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 after initial usage
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No offline access to stories and meditations
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: User interface can feel cluttered
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of personalization features
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.
From the makers of Calm, the top Meditation & Mindfulness app trusted by 40M+ listeners, Calm Sleep is a new standalone app for deeper, more personalized sleep support. Take the stress out of sleep with over 300+ hours of sleep content from leading sleep and mindfulness experts listened to for more than 50 billion minutes. We make it effortless to fall (and stay) asleep. Whether it’s with a gentle stretch or calming Sleep Stories®, we help replace bad sleep habits with a better wind down to help you clear your headspace and find better sleep. Fall (and stay) asleep easily, with narrated Sleep Stories, music, soundscapes, breathwork, and routines that are made to help you relax. Backed by leading sleep and mindfulness experts around the world. Of Calm users who use Calm Sleep Stories 5x a week, 92% saw higher sleep quality and 72% reported less stress. Our holistic wake-up, daytime, wind-down, and bedtime plans fit seamlessly into your life, so you can finally rest easy and wake up feeling refreshed. Download today to discover sound sleep and relaxation. FREE YOUR MIND WITH THE FEATURES OF CALM SLEEP: - Favorites - save your favorite content to return to every night - Timers - stop the app after a set amount of time - Sleep Plans - improve your sleep hygiene and form good habits that help you sleep better - Data - review your sleep patterns/trends over time RELAX WITH SLEEP STORIES - Simplify bedtime when you choose from 500+ Sleep Stories - From sci-fi to fantasy or kids' stories to ASMR- Calm Sleep has plenty of options that promote better sleep - Wonder - Matthew McConaughey - Dream with Me - Harry Styles - Crossing Ireland by Train - Cillian Murphy - Beauty and the Beast - Alan Sklar MUSIC AND SOUNDSCAPES - Sleep better with your choice of sound machine noise - Relax with calming soundscapes that can help you clear your headspace - Enjoy Ocean waves, Heavy Rain, Camp Fire, Babbling Brook, ASMR sounds, pink noise, brown noise, and more MEDITATIONS HELP TO CLEAR YOUR HEADSPACE - Create better habits and relax - Free your thoughts with mindfulness exercises, body scans and wind down routines help you with stress and anxiety relief - Access deep sleep plans that help you find consistent and restful sleep - Breathwork exercises help to center your thoughts and get you one step closer to better sleep CONNECT WITH APPLE HEALTHKIT FOR SLEEP TRACKING & INSIGHTS - Sleep Tracker- optimize your sleep performance with sleep tracking & insights - Integrate with accepted mobile device health tracking tools - Receive guidance and action recommendations based on your sleep habits and data SUBSCRIPTION PRICING AND TERMS: Calm Sleep offers an auto-renewing yearly subscription at $69.99/year to provide you with unlimited access to Calm Sleep content 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 at the then-current retail price 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.