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
My Budget Book
Take full control of your finances with My Budget Book – the simple and secure way to track income, expenses and budgets on iPhone and iPad.
$1.79 · In-app purchases
PRICE
$1.79
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.7
21 ratings · Top 50%
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 included18 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 My Budget Book: 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
Streamline the user interface with clearer navigation and fewer elements on each screen.
Assumption to check: Users find the app difficult to navigate due to a cluttered UI.
Validate with people who use this workflow before building.
Hypothesis 2
Provide multiple export formats (CSV, PDF) for user convenience.
Assumption to check: Limited export options for transaction data.
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to create and modify budget categories.
Assumption to check: Lack of customization for budget categories.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize the app's performance for lower-end devices.
Assumption to check: Inconsistent performance reported on older devices.
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
Take full control of your finances with My Budget Book – the simple and secure way to track income, expenses and budgets on iPhone and iPad. ▶ Why choose My Budget Book? • Easy & intuitive – quick entry with auto-completion and clean design. • No subscriptions – all features included, one-time purchase, no hidden costs. • Unlimited flexibility – manage unlimited accounts, income, expenses and transfers. • Automation – recurring transactions are added automatically. • CSV import – import bank statements or spreadsheets (CSV/Excel) from any source. • Export options – export your data to Excel, Numbers, CSV or HTML for further use. • Analysis & planning – track budgets, view reports and generate clear statistics and charts. • Security – encrypted local and iCloud backups, Face/Touch ID, passcode protection. • Multi-language support – use the app worldwide with multiple languages and currencies. ▶ Highlights • Monthly overviews with custom start date (e.g. salary day). • Forecast of upcoming and past months. • Detailed reports by category, person, account or payment type. • Instant search and filtering. • Always see current balance and monthly totals. • Print directly from the app via AirPrint. ▶ Award-winning 3rd place at the connect App Award in the “Finance & Business” category. ▶ Always up to date We continuously improve the app, listen to user feedback, and provide regular free updates. ▶ Support Got questions or ideas? Contact us – we reply quickly and are happy to help. Manage your money reliably and securely with My Budget Book – the complete finance manager without subscriptions.
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
Intermediate
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.
