App Overview

Sleep Sounds HQ: relaxing aid icon

Sleep Sounds HQ: relaxing aid

Phase4 Mobile · Health & Fitness

* As seen on CNN, Lifehacker, and Engadget.com *

$59.99 · In-app purchases

PRICE
$59.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.8
3,033 ratings · Top 5%

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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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.

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.

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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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Sleep Sounds HQ: relaxing aid: 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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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

HealthKit integration for accurate data

Assumption to check: Inaccurate tracking

Validate with people who use this workflow before building.

Hypothesis 2

AI-personalized recommendations

Assumption to check: Generic workout plans

Validate with people who use this workflow before building.

Hypothesis 3

Add friend challenges and sharing

Assumption to check: No social features

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

* As seen on CNN, Lifehacker, and Engadget.com * Fall asleep fast to over 600 high-quality full-stereo recordings from around the world. • "It is one of the best apps I have used to keep me calm and to go to sleep" - V lovelyu - • "Lull me into relaxing! -Downloaded last night and easily selected sounds to make a custom mix of favorites: chimes, rain and a really cool "celestial" sound. The choices are many and are super good quality. I've had a hard time finding an app of sounds that were good and not so cliche." - ElizGoetz • "Beautiful app -Not only are the sounds fabulous, the photos are incredible. Easy to use, elegant interface. Great app!" - WebbyHess19 Sleep deeply every night, and wake up feeling fresh and energized. Sleep Sounds HQ gives you immediate access to a massive catalog of high-quality, naturally recorded sounds. Much better than synthetic sounds and short repetitive loops, these are real-world sounds with all the richness, texture, and nuance of the natural environment. Imagine falling asleep to soft rain on a Bali rice terrace, a Himalayan stream, Red Sea waves, South African crickets, a warm crackling campfire, or enchanting wind chimes.  Or … if you prefer the steady hum of 'white noise’, fall asleep to a steady blizzard, Swiss waterfall, the drone of a Dutch highway, a working flour mill, dishwashers and spinning washing machines, or pure white, pink, and brown noise. You will fall asleep fast and wake up feeling refreshed and rejuvenated. What's more, Sleep Sounds HQ can be used anytime you need to block out the outside world: • Increase your ability to focus and be creative at work by removing distractions. • Soothe your baby or small children and create a peaceful sanctuary for you and your family. • Transform your hotel room into a familiar sleep oasis by blocking out noisy neighbors, ice machines, and elevator doors. • Create a calm and tranquil environment for meditation and yoga. With over 600 high-quality audio tracks to choose from, fine-tune a collection of sounds to your individual taste. And if that isn't enough, you can create your own personalized mixes for sleep, work, travel, nap time, or meditation, blending up to 6 sounds at a time. Improve your sleep, your health, and your sense of well-being starting tonight. Sleep Sounds HQ Features: • 600+ natural sounds recorded on location around the world • Long high-quality stereo recordings • Beautiful high-definition images from around the globe • Modern easy-to-use interface, tailored for nighttime use • Sleep timer with slow audio fade-out, settable with a simple tap • Easy-to-create blended mixes of any 6 sounds, with 35 trillion possible combinations • Easy search functions to discover your favorite sounds • Runs in background while using other apps or when the screen is locked • 19 sound categories, including Rain, Ocean, Rivers & Streams, Crickets & Insects, Frogs, Wind Chimes, Lakes, Wind, Water Fountains, Fire, Birds, Animals, Cars, Trains, Public Places, Household, Bells, Industrial, Soundscapes Download Sleep Sounds HQ now to fall asleep fast. Image credits: http://www.phase4mobile.com/image-credits/

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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
HealthKit
Supabase
RevenueCat
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.