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
Contract Countdown
Contact Countdown lets you input your Sea Contract 'start' and 'end' dates to show you a few calculations on your progress through time
$0.99 · In-app purchases
PRICE
$0.99
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 included13 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 Contract Countdown: map the core Lifestyle 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
Implement robust reminder settings and note-taking features.
Assumption to check: Limited contract management features such as reminders or notes
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to export their contracts to CSV or PDF.
Assumption to check: Lack of data export options
Validate with people who use this workflow before building.
Hypothesis 3
Enable users to share contract details with others.
Assumption to check: No sharing functionality
Validate with people who use this workflow before building.
Hypothesis 4
Provide more settings for notification preferences.
Assumption to check: Minimal customization options for notifications
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
Contact Countdown lets you input your Sea Contract 'start' and 'end' dates to show you a few calculations on your progress through time. You can include all your previous contracts to get calculations like how many contracts you have completed and also how many days you have spend onboard in total. All you have to do is input your Ship Name, Contract Start Date then End Date and the App will show you; - Total Days of your contract - Total Days of all contracts - Days Complete - Days Remaining - Percent Complete - Percent Remaining - Total number of Contracts Complete You can also calculate how many days you were onboard during a tax year. All you have to do is input your tax year start & end date, hit ‘Calculate’ and you get total days during that year! Just a bit of fun for Staff and Crew working at sea. You can then share your stats on Social media with a screenshot and a custom message. We have added what is called the red zone at 80% complete, this is the home stretch as you run up to returning home.
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
Supabase
React Navigation
react-native-push-notification
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.
