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
Eggspert timer
Egg Timer, perfeggted (or at least very close)
$0.49 · In-app purchases
PRICE
$0.49
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 Eggspert timer: map the core Food & Drink 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 community features like sharing recipes or tips.
Assumption to check: Limited user engagement features (no social sharing or community)
Validate with people who use this workflow before building.
Hypothesis 2
Include user preferences for egg doneness and favorite recipes.
Assumption to check: No personalization options
Validate with people who use this workflow before building.
Hypothesis 3
Implement pause/resume functionality for user flexibility.
Assumption to check: Lack of advanced timer features (no pause/resume)
Validate with people who use this workflow before building.
Hypothesis 4
Provide nutritional details for recipes to enhance value.
Assumption to check: No nutritional information
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
Egg Timer, perfeggted (or at least very close) Cooking eggs shouldn’t require guesswork, spreadsheets, or blind faith. Eggspert Timer helps you cook eggs exactly the way you like them. Consistently. By taking into account egg weight and your location, the app calculates the optimal cooking time and lets you focus on more important things. Like coffee. Or toast. Smart timing – Results are based on egg size and location, not generic averages. No bulls… just the essentials – Clean, focused design with only the information you actually need. Works across devices – Start a timer on your phone, keep an eye on it on your watch. Notifications that matter – You’ll be notified exactly when your egg is up to standard – even if your phone is locked. Who is this for? • People who like soft-boiled eggs soft • People who like hard-boiled eggs consistently hard • People who are tired of “about 6 minutes, 34 seconds and a bit?” • People who want another app
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
Expo
Supabase
axios
expo-notifications
@react-navigation/native
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.
