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
Baby Sleep Trainer: Ferber
Sleep training at 2am? Just follow the timer.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included15 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.
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 Baby Sleep Trainer: Ferber: 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
Provide clear, step-by-step guides and visual aids.
Assumption to check: Difficulty understanding sleep training methods
Validate with people who use this workflow before building.
Hypothesis 2
Implement custom sleep plans based on user input.
Assumption to check: Lack of personalized tracking
Validate with people who use this workflow before building.
Hypothesis 3
Add community forums or chat support for users.
Assumption to check: Limited support options
Validate with people who use this workflow before building.
Hypothesis 4
Make subscription models clear and easy to understand.
Assumption to check: In-app purchase confusion
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 training at 2am? Just follow the timer. Baby Sleep Trainer is the simple, reliable Ferber Method timer for exhausted parents. Escalating check-in intervals, lock screen countdown, and automatic partner sync. No subscriptions. No sign-ups. Buy once. - Lock Screen & Dynamic Island countdown — see time remaining without unlocking your phone - Partner Sync over iCloud — both phones stay on the same timer, same check-in count - Settling phase tracking — know when baby is quiet but not yet asleep - Apple Watch & Live Activity support - Custom intervals per night How it works: The Ferber Method uses timed intervals that gradually increase (3 min, 5 min, 10 min...). The app handles the timing and tells you exactly when to check in. You just follow the prompts. No subscriptions. No accounts. Your data stays on your device and iCloud. Built by parents, for the 2am moments when you need clarity, not complexity.
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
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expo-slider
BUILD KIT DIFFICULTY
Starter
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.
