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.
App Overview
SleepMatic: Sleep Tracker
Sleep tracking should be effortless.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
8,743 ratings · Top 30%
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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for SleepMatic: Sleep Tracker: 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
Add more comprehensive features like sleep analysis and personalized recommendations.
Assumption to check: Limited sleep tracking features compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Ensure seamless integration with wearable devices for accurate data.
Assumption to check: Inconsistent data syncing with wearables.
Validate with people who use this workflow before building.
Hypothesis 3
Introduce social challenges and community sharing for motivation.
Assumption to check: Lack of community support or social features.
Validate with people who use this workflow before building.
Hypothesis 4
Revamp the UI with modern design elements and personalization options.
Assumption to check: Basic UI design that feels outdated.
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
Sleep tracking should be effortless. SleepMatic automatically tracks your sleep using your Apple Watch. Simply wear your Watch to bed and wake up to a clear report—without starting a session, setting a sleep window, or remembering to stop tracking. Terms of use: http://www.vimo.co/termsofuse/ Privacy policy: http://www.vimo.co/privacy/ Automatic by design - Detects when you fall asleep and wake up - Tracks nighttime sleep and daytime naps - Works without a predefined sleep schedule - Lets you tune detection sensitivity to fit how you sleep Understand your nights See when you went to bed, fell asleep, woke up, and got out of bed. Review restful and restless periods, heart-rate information, and trends across nights, weeks, and months. Discover what affects your sleep Add notes and hashtags such as #coffee, #exercise, or #lateMeal. Compare your tagged nights over time and identify patterns in your routine. Your data, where you need it SleepMatic integrates with Apple Health and lets you correct recently detected sleep sessions when needed. Just wear your Apple Watch. SleepMatic handles the rest.
Written user reviews are not shown here. Check current App Store reviews >
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
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expo-av
BUILD KIT DIFFICULTY
Advanced
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.
