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
Billpad: Bill Reminder
Keep track of all your bills and have peace of mind.
$4.99 · In-app purchases
PRICE
$4.99
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.
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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 included17 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 Billpad: Bill Reminder: map the core Finance 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 customizable reminders with notifications.
Assumption to check: Many users forget to pay bills due to lack of reminders.
Validate with people who use this workflow before building.
Hypothesis 2
Add a categorization feature for bills.
Assumption to check: Tracking multiple bills can become overwhelming.
Validate with people who use this workflow before building.
Hypothesis 3
Include charts and graphs for payment trends.
Assumption to check: Users may find it hard to visualize their payment history.
Validate with people who use this workflow before building.
Hypothesis 4
Provide a clear breakdown of features for each subscription tier.
Assumption to check: Users are often confused by subscription models.
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
Keep track of all your bills and have peace of mind. BILL MANAGEMENT: • Get reminders before your bills due dates. • Add Widgets to your home screen to keep track of your bills at a glance. • Enter your bills info with ease using natural language. • Detects common bill categories and add icons automatically. • Use iCloud to have your bills synced across all your devices. • You can export and restore backups with all your data. PAYMENT HISTORY: • Keep track of your payments. • Check your paid amount trends at a glance with the bar chart. • Get an estimated amount to pay for you variable bills. TAGS & FILTERS: • Use tags to categorize your bills. • You can filter by tag or due date categories. • Sort and edit your tags based on your priorities. • Calculate the total amount for your selected filter. CLEAN USER INTERFACE: • Modern look and feel: clean and easy to use interface. • Swipe gestures to delete and mark as paid. • Support for Dark Mode.
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.
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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.
