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
Egghart – The Egg Timer
Sunday morning breakfast is served
$0.99 · In-app purchases
PRICE
$0.99
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 Egghart – The Egg 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
Focus on user feedback and iterate features based on actual user needs.
Assumption to check: Limited user reviews and insights
Validate with people who use this workflow before building.
Hypothesis 2
Differentiate with engaging recipes and community sharing.
Assumption to check: Potential lack of unique features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 3
Enhance UI/UX design to attract more users.
Assumption to check: Limited visual appeal and design
Validate with people who use this workflow before building.
Hypothesis 4
Add features for saving favorite timers and customizing settings.
Assumption to check: No timer history or customization options
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
Sunday morning breakfast is served. Delicious rolls, freshly squeezed orange juice, everything seems perfect… And then, disaster occurs: The breakfast egg was not cooked just right. The egg yolk runs over the egg cup or it is rock hard cooked. Fortunately, this disaster has come to an end thanks to Egghart - The egg timer for your perfect breakfast egg. The duration of the cooking time is determined by the size of the eggs, information about refrigerator, room temperature and even the altitude in which you are located. Sounds complicated? It is not. Egghart gives you live feedback on the cooking status of your perfect breakfast egg and an audio signal will automatically let you know when the egg is done to your exact liking. Now the only thing left for you to do is to quench the egg with cold water and scoop out the insides. Bon Appétit! Feedback and suggestions are highly appreciated: support@egghart.app Yours, Egghart –– Product Design: Dana Saager
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
Zustand
react-navigation
expo-av
react-native-reanimated
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.
