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
BillPing: Bill Tracker
BillPing is a simple bill tracker for recurring bills, due dates, and payment reminders.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
3 ratings · Top 15%
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 BillPing: Bill Tracker: 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 custom categories for better organization.
Assumption to check: Limited bill categorization options.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to set up recurring bills for automatic reminders.
Assumption to check: Lack of recurring bill management.
Validate with people who use this workflow before building.
Hypothesis 3
Integrate charts and graphs to visualize spending patterns.
Assumption to check: No visual spending analytics.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance push notification reliability to ensure reminders are received.
Assumption to check: Notifications can be unreliable.
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
BillPing is a simple bill tracker for recurring bills, due dates, and payment reminders. Track rent, mortgage, utilities, insurance, loans, subscriptions, and any bill you do not want to miss. Add a due date, choose how often it repeats, set a reminder, and mark it paid when you are done. BUILT FOR REAL BILLS - Add fixed bills or leave the amount blank for variable bills like electricity, water, or gas - Repeat bills weekly, biweekly, monthly, quarterly, or yearly - Get reminders on the due date, 1 day before, or 3 days before - Mark bills paid or unpaid with a tap and keep payment history SEE WHAT IS DUE - Dashboard for overdue, upcoming, and paid bills - Calendar view for bill due dates - Monthly totals for known amounts - Searchable history for past payments PRIVATE BY DEFAULT - No bank connection - No account - No ads - No subscription - Your bill data stays on your device - Product analytics and crash diagnostics never include bill names, amounts, notes, due dates, or payment history BillPing is for people who want a focused bill organizer, not a full budgeting app. Buy once, own forever. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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.
