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
Double-Entry Bookkeeping
Debit and credit, assets and liabilities, expenses and revenue
$39.00 · In-app purchases
PRICE
$39.00
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/
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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 Double-Entry Bookkeeping: 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
Provide a tutorial or onboarding guide that simplifies the concepts.
Assumption to check: Complexity in understanding double-entry bookkeeping for new users
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to create custom reports and visualizations.
Assumption to check: Limited customization options for reports
Validate with people who use this workflow before building.
Hypothesis 3
Implement multi-account support with an easy toggle between accounts.
Assumption to check: Difficulty in tracking multiple accounts simultaneously
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a free trial or freemium model to attract more users.
Assumption to check: High upfront cost with no trial version
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
Debit and credit, assets and liabilities, expenses and revenue. The classic accounting system is designed to ensure that your journal entries are complete. In Double-Entry Bookkeeping you create accounts, record opening balances and post journal entries. Based on this, Double-Entry Bookkeeping calculates daily balance lists as well as balance sheets and profit and loss. Double-Entry Bookkeeping provides a comprehensive overview of your business and personal finances. You use Double-Entry Bookkeeping not because you have to, but because you want to. A selection of the features - Distraction-free user interface in several languages - Simple workflows - Unlimited number of accounts and postings - Simplifications for recurring transactions - All user entries can be updated - Automatic balance transfer between calendar years - Budgeting without additional data input - Backup and restore on the level of single entities - Multi-client capability Last but not least: The entities can be exported as JSON files, hashed using standard software and stored in an audit-proof manner. The philosopher Immanuel Kant (1724 - 1804) demanded with his categorical imperative: "Act only according to that maxim whereby you can at the same time will that it should become a universal law." The app respects your privacy. The app serves the sole purpose of being useful with the functionality you see in the user interface. The app does not prompt you to accept cookies or to sign in. The app stores your data on your own device and does not connect to external systems. The app was developed exclusively with native iOS technologies and not with risky third-party software. The app does not contain any advertising and there are no subscriptions or in-app purchases. The app is updated regularly.
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.
