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
PitiCalc2
PITI = Principle, Interest, Taxes, Insurance
$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.
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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 included15 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 PitiCalc2: 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 real-time input validation and user-friendly error messages.
Assumption to check: Users often struggle with input validation and errors in finance apps.
Validate with people who use this workflow before building.
Hypothesis 2
Use visually appealing charts and graphs to display calculated results.
Assumption to check: Many finance apps lack clear presentation of results.
Validate with people who use this workflow before building.
Hypothesis 3
Provide clear information about the benefits of premium features and streamline the purchase process.
Assumption to check: In-app purchases can be confusing and poorly integrated.
Validate with people who use this workflow before building.
Hypothesis 4
Add onboarding tips and reminders for settings adjustment.
Assumption to check: Users may forget to adjust settings for currency and 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
PITI = Principle, Interest, Taxes, Insurance Easily calculate auto and home loans using this simple, fast, tool that provides only the functionality you need! The Auto Loan tab includes the basic values for calculating an auto loan and also include a trade pay off field for entering any payoff that may exist on a trade in. There is also an option button that can be set to include or not include the trade in amount when calculating taxes as this varies by location. The auto loan tab can also be used to calculate a payment for most any type of loan. Home mortgages can be calculated for conventional, FHA and VA loan types. Besides the standard data, each loan type has fields for insurance, taxes and HOAs. The FHA loan type includes the calculation for FHA monthly insurance and the VA loan type includes the calculation for the VA funding fee and allows the selection of a first or subsequent loan. This allows for a complete estimate of the payment on the home. Any fields that occur on other screens will have their values copied from screen to screen. This makes it easy to compare the different types of loans and their estimated payments. No data is saved when PitiCalc is closed and all data stays on the device.
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
TypeScript
react-navigation
react-native-paper
@react-native-async-storage/async-storage
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.
