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
NextDue: Bill Tracker
Never miss a bill again.
$2.99 · In-app purchases
PRICE
$2.99
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 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 NextDue: 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 better reminder systems and customizable notifications.
Assumption to check: Users often forget to pay bills leading to late fees.
Validate with people who use this workflow before building.
Hypothesis 2
Create a more intuitive categorization system for bills.
Assumption to check: Difficulty in managing multiple bills.
Validate with people who use this workflow before building.
Hypothesis 3
Introduce graphs to visualize payment history and trends.
Assumption to check: Lack of visual representations of bill trends.
Validate with people who use this workflow before building.
Hypothesis 4
Integrate with banking APIs for automatic bill tracking.
Assumption to check: Limited integration with banking systems.
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
Never miss a bill again. NextDue helps you stay organized by tracking bills, subscriptions, recurring payments, and due dates — all in a clean, simple, and private experience. FEATURES • Scan or Add Bills Manually Quickly scan paper bills or manually add bills in seconds — whichever works best for you. • Smart Due Date Tracking See what's due today, tomorrow, and upcoming at a glance. • Recurring Bills Made Simple Set recurring bills and subscription payments so you never miss a due date. • Home Screen Widgets Stay updated without opening the app. • Smart Reminders Get notified before bills are due so you never miss a payment. • Mark Bills as Paid Keep track of completed payments and payment history. • Private & Secure Your data stays on your device. No account required. • Works Offline Manage your bills anytime, even without an internet connection. • Clean & Simple Design Built to help you focus on what matters. PERFECT FOR • Utilities • Credit Cards • Rent • Internet Bills • Subscriptions • Insurance • Personal Expenses WHY NEXTDUE? • Scan or manually add bills • Bill reminders and due date tracking • Recurring bill and subscription tracking • Home screen widgets • Offline-first experience • Private by design • Beautiful, easy-to-use interface Download NextDue today and stay ahead of every due date.
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
zustand
expo-notifications
react-navigation
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.
