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
LatchTime: Breastfeeding Timer
LATCHTIME'S DIFFERENTIATING FEATURES VS
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
4 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 included16 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 LatchTime: Breastfeeding Timer: map the core Medical 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 insights like feeding patterns and reminders.
Assumption to check: Limited tracking features beyond timing
Validate with people who use this workflow before building.
Hypothesis 2
Implement auto-save functionality.
Assumption to check: Potential for data loss if app crashes
Validate with people who use this workflow before building.
Hypothesis 3
Create a forum or tips section within the app.
Assumption to check: Lack of community support for breastfeeding tips
Validate with people who use this workflow before building.
Hypothesis 4
Simplify pricing structure and clarify benefits.
Assumption to check: Subscription model can be confusing
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
LATCHTIME'S DIFFERENTIATING FEATURES VS. THE OTHER BABY TRACKER APPS - PRIVACY FOCUSED: No ads, no tracking, no recurring subscription fee, no onboarding questionnaire, and no need to create an account - ONE-HANDED USE: Easy to use one-handed while nursing with large, easy-to-reach buttons at the bottom of the screen - MINIMAL NAVIGATION: Do and see nearly everything from a single view - DARK MODE: Supports dark mode for night feeds - MODERN DESIGN: Built for Liquid Glass using Apple's latest frameworks: SwiftData and SwiftUI - NOT BLOATED: Focused on being a really good breastfeeding app vs. a mediocre ultimate newborn tracking everything app EVEN MORE GREAT FEATURES - LAST BREAST: See which breast you started during the last feeding at a glance - PAUSE TIMER: Pause the timer to burp or change a diaper before continuing the feeding session - SWITCH BREASTS: Feed on a single breast or both breasts and have it tracked in the same feeding session - BOTTLE FEEDING: Track bottle feedings of breast milk or formula in ounces or milliliters - NOTIFICATIONS: Be automatically reminded with a push notification for those times you forget to stop the timer
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
React Native
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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.
